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App\Entity\EntryComment {#1595
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App\Entity\EntryComment {#1595
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App\Entity\EntryComment {#1595
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6 |
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moderate
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Proxies\__CG__\App\Entity\Entry {#1728
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I’m trying to build a esp8266 weather station and got some MCP1700-3302E to power the esp8266 from a lipo. But when I connect the lipo to the MCP1700 (looking at it flat spot at the front, ground left, Vin in the middle and Vout on the right) I get no output at Vout. I googled and could not find anything. I tested 5 different ones and it’s the same for all of them. Could I just have a batch of broken ones? Edit: attached a picture of my very simple test setup Edit 2: I just connected three lipo directly to Vin, that seems to work without any problems (at least for a few days now)\n
\n

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Show voter details
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7 |
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edit
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Proxies\__CG__\App\Entity\Entry {#1728
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I’m trying to build a esp8266 weather station and got some MCP1700-3302E to power the esp8266 from a lipo. But when I connect the lipo to the MCP1700 (looking at it flat spot at the front, ground left, Vin in the middle and Vout on the right) I get no output at Vout. I googled and could not find anything. I tested 5 different ones and it’s the same for all of them. Could I just have a batch of broken ones? Edit: attached a picture of my very simple test setup Edit 2: I just connected three lipo directly to Vin, that seems to work without any problems (at least for a few days now)\n
\n

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Show voter details
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moderate
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Proxies\__CG__\App\Entity\Entry {#1728
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I’m trying to build a esp8266 weather station and got some MCP1700-3302E to power the esp8266 from a lipo. But when I connect the lipo to the MCP1700 (looking at it flat spot at the front, ground left, Vin in the middle and Vout on the right) I get no output at Vout. I googled and could not find anything. I tested 5 different ones and it’s the same for all of them. Could I just have a batch of broken ones? Edit: attached a picture of my very simple test setup Edit 2: I just connected three lipo directly to Vin, that seems to work without any problems (at least for a few days now)\n
\n

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Show voter details
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9 |
DENIED
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Show voter details
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10 |
DENIED
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moderate
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App\Entity\EntryComment {#2461
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I’m trying to build a esp8266 weather station and got some MCP1700-3302E to power the esp8266 from a lipo. But when I connect the lipo to the MCP1700 (looking at it flat spot at the front, ground left, Vin in the middle and Vout on the right) I get no output at Vout. I googled and could not find anything. I tested 5 different ones and it’s the same for all of them. Could I just have a batch of broken ones? Edit: attached a picture of my very simple test setup Edit 2: I just connected three lipo directly to Vin, that seems to work without any problems (at least for a few days now)\n
\n

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Show voter details
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11 |
DENIED
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edit
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App\Entity\EntryComment {#2461
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I’m trying to build a esp8266 weather station and got some MCP1700-3302E to power the esp8266 from a lipo. But when I connect the lipo to the MCP1700 (looking at it flat spot at the front, ground left, Vin in the middle and Vout on the right) I get no output at Vout. I googled and could not find anything. I tested 5 different ones and it’s the same for all of them. Could I just have a batch of broken ones? Edit: attached a picture of my very simple test setup Edit 2: I just connected three lipo directly to Vin, that seems to work without any problems (at least for a few days now)\n
\n

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Show voter details
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12 |
DENIED
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moderate
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App\Entity\EntryComment {#2461
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I’m trying to build a esp8266 weather station and got some MCP1700-3302E to power the esp8266 from a lipo. But when I connect the lipo to the MCP1700 (looking at it flat spot at the front, ground left, Vin in the middle and Vout on the right) I get no output at Vout. I googled and could not find anything. I tested 5 different ones and it’s the same for all of them. Could I just have a batch of broken ones? Edit: attached a picture of my very simple test setup Edit 2: I just connected three lipo directly to Vin, that seems to work without any problems (at least for a few days now)\n
\n

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Show voter details
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13 |
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Show voter details
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App\Entity\EntryComment {#1726
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I’m trying to build a esp8266 weather station and got some MCP1700-3302E to power the esp8266 from a lipo. But when I connect the lipo to the MCP1700 (looking at it flat spot at the front, ground left, Vin in the middle and Vout on the right) I get no output at Vout. I googled and could not find anything. I tested 5 different ones and it’s the same for all of them. Could I just have a batch of broken ones? Edit: attached a picture of my very simple test setup Edit 2: I just connected three lipo directly to Vin, that seems to work without any problems (at least for a few days now)\n
\n

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App\Entity\EntryComment {#1726
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I’m trying to build a esp8266 weather station and got some MCP1700-3302E to power the esp8266 from a lipo. But when I connect the lipo to the MCP1700 (looking at it flat spot at the front, ground left, Vin in the middle and Vout on the right) I get no output at Vout. I googled and could not find anything. I tested 5 different ones and it’s the same for all of them. Could I just have a batch of broken ones? Edit: attached a picture of my very simple test setup Edit 2: I just connected three lipo directly to Vin, that seems to work without any problems (at least for a few days now)\n
\n

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Show voter details
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16 |
DENIED
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moderate
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App\Entity\EntryComment {#1726
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I’m trying to build a esp8266 weather station and got some MCP1700-3302E to power the esp8266 from a lipo. But when I connect the lipo to the MCP1700 (looking at it flat spot at the front, ground left, Vin in the middle and Vout on the right) I get no output at Vout. I googled and could not find anything. I tested 5 different ones and it’s the same for all of them. Could I just have a batch of broken ones? Edit: attached a picture of my very simple test setup Edit 2: I just connected three lipo directly to Vin, that seems to work without any problems (at least for a few days now)\n
\n

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|
Show voter details
|
17 |
DENIED
|
ROLE_USER
|
null |
|
Show voter details
|
18 |
DENIED
|
moderate
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App\Entity\EntryComment {#1720
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I’m trying to build a esp8266 weather station and got some MCP1700-3302E to power the esp8266 from a lipo. But when I connect the lipo to the MCP1700 (looking at it flat spot at the front, ground left, Vin in the middle and Vout on the right) I get no output at Vout. I googled and could not find anything. I tested 5 different ones and it’s the same for all of them. Could I just have a batch of broken ones? Edit: attached a picture of my very simple test setup Edit 2: I just connected three lipo directly to Vin, that seems to work without any problems (at least for a few days now)\n
\n

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Show voter details
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19 |
DENIED
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edit
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App\Entity\EntryComment {#1720
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I’m trying to build a esp8266 weather station and got some MCP1700-3302E to power the esp8266 from a lipo. But when I connect the lipo to the MCP1700 (looking at it flat spot at the front, ground left, Vin in the middle and Vout on the right) I get no output at Vout. I googled and could not find anything. I tested 5 different ones and it’s the same for all of them. Could I just have a batch of broken ones? Edit: attached a picture of my very simple test setup Edit 2: I just connected three lipo directly to Vin, that seems to work without any problems (at least for a few days now)\n
\n

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Show voter details
|
20 |
DENIED
|
moderate
|
App\Entity\EntryComment {#1720
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I’m trying to build a esp8266 weather station and got some MCP1700-3302E to power the esp8266 from a lipo. But when I connect the lipo to the MCP1700 (looking at it flat spot at the front, ground left, Vin in the middle and Vout on the right) I get no output at Vout. I googled and could not find anything. I tested 5 different ones and it’s the same for all of them. Could I just have a batch of broken ones? Edit: attached a picture of my very simple test setup Edit 2: I just connected three lipo directly to Vin, that seems to work without any problems (at least for a few days now)\n
\n

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|
Show voter details
|
21 |
DENIED
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ROLE_USER
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null |
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Show voter details
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22 |
DENIED
|
moderate
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Proxies\__CG__\App\Entity\Entry {#1527
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I did not know about this mounting method. Probably it’s a way to improve passive cooling capabilities?\n
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Show voter details
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23 |
DENIED
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edit
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Proxies\__CG__\App\Entity\Entry {#1527
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I did not know about this mounting method. Probably it’s a way to improve passive cooling capabilities?\n
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Show voter details
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24 |
DENIED
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moderate
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Proxies\__CG__\App\Entity\Entry {#1527
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I did not know about this mounting method. Probably it’s a way to improve passive cooling capabilities?\n
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25 |
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26 |
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moderate
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App\Entity\EntryComment {#1525
+user: App\Entity\User {#261 …}
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+body: """
I did not know about this mounting method. Probably it’s a way to improve passive cooling capabilities?\n
\n

"""
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Show voter details
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27 |
DENIED
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edit
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App\Entity\EntryComment {#1525
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+slug: "Riser-mount-for-smd-component"
+title: "Riser mount for smd component"
+url: null
+body: """
I did not know about this mounting method. Probably it’s a way to improve passive cooling capabilities?\n
\n

"""
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|
Show voter details
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28 |
DENIED
|
moderate
|
App\Entity\EntryComment {#1525
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+entry: Proxies\__CG__\App\Entity\Entry {#1527
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+title: "Riser mount for smd component"
+url: null
+body: """
I did not know about this mounting method. Probably it’s a way to improve passive cooling capabilities?\n
\n

"""
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|
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null |
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30 |
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moderate
|
Proxies\__CG__\App\Entity\Entry {#1604
+user: Proxies\__CG__\App\Entity\User {#2013 …}
+magazine: Proxies\__CG__\App\Entity\Magazine {#1575 …}
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+domain: Proxies\__CG__\App\Entity\Domain {#2328 …}
+slug: "PCB-Design-Review-Request-ESP32-Smart-Relay-Board"
+title: "PCB Design Review Request: ESP32 Smart Relay Board"
+url: null
+body: """
Hi, this post is structured similarly to r/PrintedCircuitBoard 's review request format. Since we don’t have any PCB communities over here yet, I thought that this might fit in here and can maybe spark some friendly discussion.\n
\n
This is a relay board controlling electrically driven windows and blinds. For this purpose it has some additional connectors to a weather station, interior sensors and an LCD screen.\n
\n
It is replacing a ~20 year old board that has started to develop some annoying quirks. I’ve mostly copied what the original board did and adjusted it for the ESP32. This is not a production board and if all goes well, I will only ever assemble a single one of these.\n
\n
The primary usage scenario is that the MCU will monitor the weather station and then actuate the motor groups (M1 - M6 connected on `J3` - `J8`) to keep the indoors temperature and humidity in check.\n
\n
At least during summer time the board will likely run 24/7 and will hopefully be used for a number of years. For maintenance reasons I’ve tried to keep it simple and the component count low.\n
\n
Mains power is supplied from `J1` and being fed to the motors via the relays. `PS1` converts the line voltage to +5V DC for the relay coils and some auxiliary components. The switching regulator `U2` steps that down to +3.3V for the MCU `U1` and IO Expander `U3`.\n
\n
The board size is mostly constrained by the preexisting mounting holes which gives me plenty of space to work with even with just a 2 layer board. The enclosure containing the mounts is installed indoors and is finger-pokey-tight.\n
\n
Jumper `JP1` allows me to supply the MCU devkit daughter board with +5V, should I ever replace it with a different one. Similarly `J11` exists for future expansion.\n
\n
`J10` mounts another daughter board (not included in review) facilitating communications with the weather station. Should the station ever need to be replaced I can swap in a new, matching board.\n
\n
There aren’t any high-speed connections on the board. The fastest one is likely the SPI connection to the LCD controller but I can slow it down in firmware if necessary.\n
\n
Regarding the DNP components: There are only 5 motors installed at the moment so I will cover the sixth slot with a piece of plastic for now. `R1` and `R2` will only be populated if the 10k pullup resistors integrated into the MCU are insufficient for typical baud rates.\n
\n
While it is not the first board I’ve designed, it is the first one carrying mains power (European grid 230V@50Hz). I’m using 2 oz copper to accommodate the motor currents within reasonably wide traces.\n
\n
In case anyone is interested, it will be running the ESPHome firmware to easily integrate with the Home-Assistant smart home solution. This also pushes firmware maintenance from me onto the ESPHome devs.\n
\n
3D render from front (no 3D model for relays `K**` and MCU board; 3D model for `J1` and `J2` is a stand-in of same outer dimensions): \n
\n
Orthographic view from front: \n
\n
Schematic:\n
\n
\n
\n
PCB All layers (For reference: thickest traces are 2.5 mm / ~98.4 mils; thinnest traces are 0.25 mm / ~9.84 mils): \n
\n
PCB Front layers excluding Silkscreen: \n
\n
PCB Back layers + Front Fab layer: 
"""
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I haven’t got enough time on my hands right now to review the whole desingn, but one thing that jumps to mind is that you’ll want to use an antiparallel diode on each relay coil to suppress the negative voltage spikes when switching it off.\n
\n
Be sure to keep adequate distance between high and low voltage traces. The ground plane seems awfully close to the N trace.\n
\n
Other than that, I’d happily welcome more PCB and/or personal project discussions!
"""
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0 => App\Entity\EntryComment {#1559
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-titleTs: "'board':8 'design':2 'esp32':5 'pcb':1 'relay':7 'request':4 'review':3 'smart':6"
-bodyTs: "'+3.3':230 '+5':211,293 '/pictrs/image/1bc119bd-4eca-49d1-9985-72491ed37276.png)':535 '/pictrs/image/45aad0ae-f5a7-48d9-b4ec-ed2e70903c00.png)':585 '/pictrs/image/59d2d309-567c-4827-bc0d-56cccf5e37d1.png)':574 '/pictrs/image/9ae85da3-3d33-4e58-b616-47c427a9dadb.png)':540 '/pictrs/image/acbcd718-af07-499b-a7c6-af473b2bb7d1.png)':564 '/pictrs/image/e10e7dc8-b4af-4500-8892-b720fc872521.png)':526 '0.25':556 '10k':410 '2':264,448 '2.5':549 '20':72 '230v':443 '24/7':164 '3d':494,499,507,522 '5':381 '50hz':444 '9.84':558 '98.4':551 'accommod':452 'actuat':135 'addit':56 'adjust':94 'allow':283 'also':484 'annoy':82 'anoth':312 'anyon':462 'aren':342 'assembl':114 'assist':479 'auxiliari':220 'back':576,581 'baud':421 'blind':49 'board':43,75,91,104,160,241,266,291,314,340,351,429,506 'carri':438 'case':461 'check':153 'coil':217 'communic':320 'communiti':20 'compon':187,221,377 'connect':141,348,359 'connector':57 'constrain':245 'contain':269 'control':44,363 'convert':206 'copi':87 'copper':450 'count':188 'cover':390 'current':455 'daughter':290,313 'dc':213 'design':432 'dev':493 'develop':80 'devkit':289 'differ':302 'dimens':521 'discuss':38 'discuss.tchncs.de':525,534,539,563,573,584 'discuss.tchncs.de/pictrs/image/1bc119bd-4eca-49d1-9985-72491ed37276.png)':533 'discuss.tchncs.de/pictrs/image/45aad0ae-f5a7-48d9-b4ec-ed2e70903c00.png)':583 'discuss.tchncs.de/pictrs/image/59d2d309-567c-4827-bc0d-56cccf5e37d1.png)':572 'discuss.tchncs.de/pictrs/image/9ae85da3-3d33-4e58-b616-47c427a9dadb.png)':538 'discuss.tchncs.de/pictrs/image/acbcd718-af07-499b-a7c6-af473b2bb7d1.png)':562 'discuss.tchncs.de/pictrs/image/e10e7dc8-b4af-4500-8892-b720fc872521.png)':524 'dnp':376 'driven':46 'easili':473 'electr':45 'enclosur':268 'esp32':98 'esphom':470,492 'european':441 'even':260 'ever':113,297,328 'exclud':568 'exist':306 'expand':238 'expans':309 'fab':579 'facilit':319 'fastest':353 'fed':198 'finger':278 'finger-pokey-tight':277 'firmwar':371,471,486 'first':428,436 'fit':29 'format':12 'friend':37 'front':497,523,530,532,566,570,578 'futur':308 'give':252 'goe':108 'grid':442 'group':138 'hi':1 'high':346 'high-spe':345 'hole':250 'home':478,481 'home-assist':477 'hope':167 'humid':151 'includ':316 'indoor':148,274 'instal':273,383 'insuffici':418 'integr':413,474 'interest':464 'interior':62 'io':237 'j1':195,510 'j10':310 'j11':305 'j2':512 'j3':143 'j8':144 'jp1':282 'jumper':281 'k':503 'keep':146,182 'layer':265,543,561,567,571,577,580,582 'lcd':66,362 'least':155 'like':162,356 'line':208 'low':189 'm':446 'm1':139 'm6':140 'main':190,439 'mainten':176,487 'match':339 'mayb':34 'mcu':127,234,288,416,505 'might':28 'mil':552,559 'mm':550,557 'model':500,508 'moment':386 'monitor':129 'most':86,244 'motor':137,201,382,454 'mount':249,271,311 'necessari':373 'need':329 'new':338 'number':172 'old':74 'one':117,303,354,437 'onto':490 'origin':90 'orthograph':527,531 'outer':520 'oz':449 'pcb':19,541,565,575 'piec':396 'plastic':398 'plenti':254 'pokey':279 'popul':407 'post':3 'power':191,440 'preexist':248 'primari':121 'product':103 'ps1':205 'pullup':411 'purpos':52 'push':485 'quirk':83 'r/printedcircuitboard':8 'r1':401 'r2':403 'rate':422 'reason':177,457 'refer':545 'regard':374 'regul':224 'relay':42,204,216,502 'render':495 'replac':70,298,332 'request':11 'resistor':412 'review':10,318 'run':163,468 'scenario':123 'schemat':536,537 'screen':67 'sensor':63 'silkscreen':569 'similar':6,304 'simpl':184 'sinc':13 'singl':116 'sixth':392 'size':242 'slot':393 'slow':367 'smart':480 'solut':482 'space':256 'spark':35 'speed':347 'spi':358 'stand':516 'stand-in':515 'start':78 'station':61,132,324,327 'step':226 'structur':5 'summer':157 'suppli':193,286 'swap':335 'switch':223 'temperatur':149 'thickest':546 'thinnest':553 'thought':25 'tight':280 'time':158 'trace':459,547,554 'tri':180 'typic':420 'u1':235 'u2':225 'u3':239 'usag':122 'use':169,447 'v':212,231,294 've':85,179,431 'via':202 'view':528 'voltag':209 'weather':60,131,323 'well':109 'wide':458 'window':47 'within':456 'work':258 'year':73,174 'yet':23"
+cross: false
+upVotes: 0
+downVotes: 0
+ranking: 1695047280
+visibility: "visible "
+apId: "https://discuss.tchncs.de/post/3401691"
+editedAt: DateTimeImmutable @1695031518 {#2130
date: 2023-09-18 12:05:18.0 +02:00
}
+createdAt: DateTimeImmutable @1694982780 {#2081
date: 2023-09-17 22:33:00.0 +02:00
}
+__isInitialized__: true
…2
} |
|
Show voter details
|
31 |
DENIED
|
edit
|
Proxies\__CG__\App\Entity\Entry {#1604
+user: Proxies\__CG__\App\Entity\User {#2013 …}
+magazine: Proxies\__CG__\App\Entity\Magazine {#1575 …}
+image: null
+domain: Proxies\__CG__\App\Entity\Domain {#2328 …}
+slug: "PCB-Design-Review-Request-ESP32-Smart-Relay-Board"
+title: "PCB Design Review Request: ESP32 Smart Relay Board"
+url: null
+body: """
Hi, this post is structured similarly to r/PrintedCircuitBoard 's review request format. Since we don’t have any PCB communities over here yet, I thought that this might fit in here and can maybe spark some friendly discussion.\n
\n
This is a relay board controlling electrically driven windows and blinds. For this purpose it has some additional connectors to a weather station, interior sensors and an LCD screen.\n
\n
It is replacing a ~20 year old board that has started to develop some annoying quirks. I’ve mostly copied what the original board did and adjusted it for the ESP32. This is not a production board and if all goes well, I will only ever assemble a single one of these.\n
\n
The primary usage scenario is that the MCU will monitor the weather station and then actuate the motor groups (M1 - M6 connected on `J3` - `J8`) to keep the indoors temperature and humidity in check.\n
\n
At least during summer time the board will likely run 24/7 and will hopefully be used for a number of years. For maintenance reasons I’ve tried to keep it simple and the component count low.\n
\n
Mains power is supplied from `J1` and being fed to the motors via the relays. `PS1` converts the line voltage to +5V DC for the relay coils and some auxiliary components. The switching regulator `U2` steps that down to +3.3V for the MCU `U1` and IO Expander `U3`.\n
\n
The board size is mostly constrained by the preexisting mounting holes which gives me plenty of space to work with even with just a 2 layer board. The enclosure containing the mounts is installed indoors and is finger-pokey-tight.\n
\n
Jumper `JP1` allows me to supply the MCU devkit daughter board with +5V, should I ever replace it with a different one. Similarly `J11` exists for future expansion.\n
\n
`J10` mounts another daughter board (not included in review) facilitating communications with the weather station. Should the station ever need to be replaced I can swap in a new, matching board.\n
\n
There aren’t any high-speed connections on the board. The fastest one is likely the SPI connection to the LCD controller but I can slow it down in firmware if necessary.\n
\n
Regarding the DNP components: There are only 5 motors installed at the moment so I will cover the sixth slot with a piece of plastic for now. `R1` and `R2` will only be populated if the 10k pullup resistors integrated into the MCU are insufficient for typical baud rates.\n
\n
While it is not the first board I’ve designed, it is the first one carrying mains power (European grid 230V@50Hz). I’m using 2 oz copper to accommodate the motor currents within reasonably wide traces.\n
\n
In case anyone is interested, it will be running the ESPHome firmware to easily integrate with the Home-Assistant smart home solution. This also pushes firmware maintenance from me onto the ESPHome devs.\n
\n
3D render from front (no 3D model for relays `K**` and MCU board; 3D model for `J1` and `J2` is a stand-in of same outer dimensions): \n
\n
Orthographic view from front: \n
\n
Schematic:\n
\n
\n
\n
PCB All layers (For reference: thickest traces are 2.5 mm / ~98.4 mils; thinnest traces are 0.25 mm / ~9.84 mils): \n
\n
PCB Front layers excluding Silkscreen: \n
\n
PCB Back layers + Front Fab layer: 
"""
+type: "article"
+lang: "en"
+isOc: false
+hasEmbed: false
+commentCount: 6
+favouriteCount: 18
+score: 0
+isAdult: false
+sticky: false
+lastActive: DateTime @1695038978 {#2056
date: 2023-09-18 14:09:38.0 +02:00
}
+ip: null
+adaAmount: 0
+tags: null
+mentions: null
+comments: Doctrine\ORM\PersistentCollection {#2057 …}
+votes: Doctrine\ORM\PersistentCollection {#2104 …}
+reports: Doctrine\ORM\PersistentCollection {#2099 …}
+favourites: Doctrine\ORM\PersistentCollection {#2108 …}
+notifications: Doctrine\ORM\PersistentCollection {#2101 …}
+badges: Doctrine\ORM\PersistentCollection {#2109 …}
+children: [
1 => App\Entity\EntryComment {#1596
+user: App\Entity\User {#261 …}
+entry: Proxies\__CG__\App\Entity\Entry {#1604 …2}
+magazine: Proxies\__CG__\App\Entity\Magazine {#1575 …}
+image: null
+parent: null
+root: null
+body: """
I haven’t got enough time on my hands right now to review the whole desingn, but one thing that jumps to mind is that you’ll want to use an antiparallel diode on each relay coil to suppress the negative voltage spikes when switching it off.\n
\n
Be sure to keep adequate distance between high and low voltage traces. The ground plane seems awfully close to the N trace.\n
\n
Other than that, I’d happily welcome more PCB and/or personal project discussions!
"""
+lang: "en"
+isAdult: false
+favouriteCount: 4
+score: 0
+lastActive: DateTime @1695019134 {#1702
date: 2023-09-18 08:38:54.0 +02:00
}
+ip: null
+tags: null
+mentions: [
"@Starfighter@discuss.tchncs.de"
]
+children: Doctrine\ORM\PersistentCollection {#1613 …}
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+favourites: Doctrine\ORM\PersistentCollection {#1565 …}
+notifications: Doctrine\ORM\PersistentCollection {#1563 …}
-id: 29287
-bodyTs: "'adequ':52 'and/or':79 'antiparallel':32 'aw':64 'close':65 'coil':37 'd':74 'desingn':16 'diod':33 'discuss':82 'distanc':53 'enough':5 'got':4 'ground':61 'hand':9 'happili':75 'haven':2 'high':55 'jump':21 'keep':51 'll':27 'low':57 'mind':23 'n':68 'negat':41 'one':18 'pcb':78 'person':80 'plane':62 'project':81 'relay':36 'review':13 'right':10 'seem':63 'spike':43 'suppress':39 'sure':49 'switch':45 'thing':19 'time':6 'trace':59,69 'use':30 'voltag':42,58 'want':28 'welcom':76 'whole':15"
+ranking: 0
+commentCount: 0
+upVotes: 0
+downVotes: 0
+visibility: "visible "
+apId: "https://compuverse.uk/comment/2036921"
+editedAt: null
+createdAt: DateTimeImmutable @1694983728 {#1619
date: 2023-09-17 22:48:48.0 +02:00
}
+"title": 29287
}
0 => App\Entity\EntryComment {#1559
+user: App\Entity\User {#261 …}
+entry: Proxies\__CG__\App\Entity\Entry {#1604 …2}
+magazine: Proxies\__CG__\App\Entity\Magazine {#1575 …}
+image: null
+parent: Proxies\__CG__\App\Entity\EntryComment {#1616 …}
+root: App\Entity\EntryComment {#1596}
+body: "You’re welcome!"
+lang: "en"
+isAdult: false
+favouriteCount: 1
+score: 0
+lastActive: DateTime @1695019132 {#1564
date: 2023-09-18 08:38:52.0 +02:00
}
+ip: null
+tags: null
+mentions: [
"@Starfighter@discuss.tchncs.de"
"@joulethief@compuverse.uk"
]
+children: Doctrine\ORM\PersistentCollection {#1630 …}
+nested: Doctrine\ORM\PersistentCollection {#1628 …}
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-id: 29292
-bodyTs: "'re':2 'welcom':3"
+ranking: 0
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date: 2023-09-18 08:38:52.0 +02:00
}
+"title": 29292
}
]
-id: 2246
-titleTs: "'board':8 'design':2 'esp32':5 'pcb':1 'relay':7 'request':4 'review':3 'smart':6"
-bodyTs: "'+3.3':230 '+5':211,293 '/pictrs/image/1bc119bd-4eca-49d1-9985-72491ed37276.png)':535 '/pictrs/image/45aad0ae-f5a7-48d9-b4ec-ed2e70903c00.png)':585 '/pictrs/image/59d2d309-567c-4827-bc0d-56cccf5e37d1.png)':574 '/pictrs/image/9ae85da3-3d33-4e58-b616-47c427a9dadb.png)':540 '/pictrs/image/acbcd718-af07-499b-a7c6-af473b2bb7d1.png)':564 '/pictrs/image/e10e7dc8-b4af-4500-8892-b720fc872521.png)':526 '0.25':556 '10k':410 '2':264,448 '2.5':549 '20':72 '230v':443 '24/7':164 '3d':494,499,507,522 '5':381 '50hz':444 '9.84':558 '98.4':551 'accommod':452 'actuat':135 'addit':56 'adjust':94 'allow':283 'also':484 'annoy':82 'anoth':312 'anyon':462 'aren':342 'assembl':114 'assist':479 'auxiliari':220 'back':576,581 'baud':421 'blind':49 'board':43,75,91,104,160,241,266,291,314,340,351,429,506 'carri':438 'case':461 'check':153 'coil':217 'communic':320 'communiti':20 'compon':187,221,377 'connect':141,348,359 'connector':57 'constrain':245 'contain':269 'control':44,363 'convert':206 'copi':87 'copper':450 'count':188 'cover':390 'current':455 'daughter':290,313 'dc':213 'design':432 'dev':493 'develop':80 'devkit':289 'differ':302 'dimens':521 'discuss':38 'discuss.tchncs.de':525,534,539,563,573,584 'discuss.tchncs.de/pictrs/image/1bc119bd-4eca-49d1-9985-72491ed37276.png)':533 'discuss.tchncs.de/pictrs/image/45aad0ae-f5a7-48d9-b4ec-ed2e70903c00.png)':583 'discuss.tchncs.de/pictrs/image/59d2d309-567c-4827-bc0d-56cccf5e37d1.png)':572 'discuss.tchncs.de/pictrs/image/9ae85da3-3d33-4e58-b616-47c427a9dadb.png)':538 'discuss.tchncs.de/pictrs/image/acbcd718-af07-499b-a7c6-af473b2bb7d1.png)':562 'discuss.tchncs.de/pictrs/image/e10e7dc8-b4af-4500-8892-b720fc872521.png)':524 'dnp':376 'driven':46 'easili':473 'electr':45 'enclosur':268 'esp32':98 'esphom':470,492 'european':441 'even':260 'ever':113,297,328 'exclud':568 'exist':306 'expand':238 'expans':309 'fab':579 'facilit':319 'fastest':353 'fed':198 'finger':278 'finger-pokey-tight':277 'firmwar':371,471,486 'first':428,436 'fit':29 'format':12 'friend':37 'front':497,523,530,532,566,570,578 'futur':308 'give':252 'goe':108 'grid':442 'group':138 'hi':1 'high':346 'high-spe':345 'hole':250 'home':478,481 'home-assist':477 'hope':167 'humid':151 'includ':316 'indoor':148,274 'instal':273,383 'insuffici':418 'integr':413,474 'interest':464 'interior':62 'io':237 'j1':195,510 'j10':310 'j11':305 'j2':512 'j3':143 'j8':144 'jp1':282 'jumper':281 'k':503 'keep':146,182 'layer':265,543,561,567,571,577,580,582 'lcd':66,362 'least':155 'like':162,356 'line':208 'low':189 'm':446 'm1':139 'm6':140 'main':190,439 'mainten':176,487 'match':339 'mayb':34 'mcu':127,234,288,416,505 'might':28 'mil':552,559 'mm':550,557 'model':500,508 'moment':386 'monitor':129 'most':86,244 'motor':137,201,382,454 'mount':249,271,311 'necessari':373 'need':329 'new':338 'number':172 'old':74 'one':117,303,354,437 'onto':490 'origin':90 'orthograph':527,531 'outer':520 'oz':449 'pcb':19,541,565,575 'piec':396 'plastic':398 'plenti':254 'pokey':279 'popul':407 'post':3 'power':191,440 'preexist':248 'primari':121 'product':103 'ps1':205 'pullup':411 'purpos':52 'push':485 'quirk':83 'r/printedcircuitboard':8 'r1':401 'r2':403 'rate':422 'reason':177,457 'refer':545 'regard':374 'regul':224 'relay':42,204,216,502 'render':495 'replac':70,298,332 'request':11 'resistor':412 'review':10,318 'run':163,468 'scenario':123 'schemat':536,537 'screen':67 'sensor':63 'silkscreen':569 'similar':6,304 'simpl':184 'sinc':13 'singl':116 'sixth':392 'size':242 'slot':393 'slow':367 'smart':480 'solut':482 'space':256 'spark':35 'speed':347 'spi':358 'stand':516 'stand-in':515 'start':78 'station':61,132,324,327 'step':226 'structur':5 'summer':157 'suppli':193,286 'swap':335 'switch':223 'temperatur':149 'thickest':546 'thinnest':553 'thought':25 'tight':280 'time':158 'trace':459,547,554 'tri':180 'typic':420 'u1':235 'u2':225 'u3':239 'usag':122 'use':169,447 'v':212,231,294 've':85,179,431 'via':202 'view':528 'voltag':209 'weather':60,131,323 'well':109 'wide':458 'window':47 'within':456 'work':258 'year':73,174 'yet':23"
+cross: false
+upVotes: 0
+downVotes: 0
+ranking: 1695047280
+visibility: "visible "
+apId: "https://discuss.tchncs.de/post/3401691"
+editedAt: DateTimeImmutable @1695031518 {#2130
date: 2023-09-18 12:05:18.0 +02:00
}
+createdAt: DateTimeImmutable @1694982780 {#2081
date: 2023-09-17 22:33:00.0 +02:00
}
+__isInitialized__: true
…2
} |
|
Show voter details
|
32 |
DENIED
|
moderate
|
Proxies\__CG__\App\Entity\Entry {#1604
+user: Proxies\__CG__\App\Entity\User {#2013 …}
+magazine: Proxies\__CG__\App\Entity\Magazine {#1575 …}
+image: null
+domain: Proxies\__CG__\App\Entity\Domain {#2328 …}
+slug: "PCB-Design-Review-Request-ESP32-Smart-Relay-Board"
+title: "PCB Design Review Request: ESP32 Smart Relay Board"
+url: null
+body: """
Hi, this post is structured similarly to r/PrintedCircuitBoard 's review request format. Since we don’t have any PCB communities over here yet, I thought that this might fit in here and can maybe spark some friendly discussion.\n
\n
This is a relay board controlling electrically driven windows and blinds. For this purpose it has some additional connectors to a weather station, interior sensors and an LCD screen.\n
\n
It is replacing a ~20 year old board that has started to develop some annoying quirks. I’ve mostly copied what the original board did and adjusted it for the ESP32. This is not a production board and if all goes well, I will only ever assemble a single one of these.\n
\n
The primary usage scenario is that the MCU will monitor the weather station and then actuate the motor groups (M1 - M6 connected on `J3` - `J8`) to keep the indoors temperature and humidity in check.\n
\n
At least during summer time the board will likely run 24/7 and will hopefully be used for a number of years. For maintenance reasons I’ve tried to keep it simple and the component count low.\n
\n
Mains power is supplied from `J1` and being fed to the motors via the relays. `PS1` converts the line voltage to +5V DC for the relay coils and some auxiliary components. The switching regulator `U2` steps that down to +3.3V for the MCU `U1` and IO Expander `U3`.\n
\n
The board size is mostly constrained by the preexisting mounting holes which gives me plenty of space to work with even with just a 2 layer board. The enclosure containing the mounts is installed indoors and is finger-pokey-tight.\n
\n
Jumper `JP1` allows me to supply the MCU devkit daughter board with +5V, should I ever replace it with a different one. Similarly `J11` exists for future expansion.\n
\n
`J10` mounts another daughter board (not included in review) facilitating communications with the weather station. Should the station ever need to be replaced I can swap in a new, matching board.\n
\n
There aren’t any high-speed connections on the board. The fastest one is likely the SPI connection to the LCD controller but I can slow it down in firmware if necessary.\n
\n
Regarding the DNP components: There are only 5 motors installed at the moment so I will cover the sixth slot with a piece of plastic for now. `R1` and `R2` will only be populated if the 10k pullup resistors integrated into the MCU are insufficient for typical baud rates.\n
\n
While it is not the first board I’ve designed, it is the first one carrying mains power (European grid 230V@50Hz). I’m using 2 oz copper to accommodate the motor currents within reasonably wide traces.\n
\n
In case anyone is interested, it will be running the ESPHome firmware to easily integrate with the Home-Assistant smart home solution. This also pushes firmware maintenance from me onto the ESPHome devs.\n
\n
3D render from front (no 3D model for relays `K**` and MCU board; 3D model for `J1` and `J2` is a stand-in of same outer dimensions): \n
\n
Orthographic view from front: \n
\n
Schematic:\n
\n
\n
\n
PCB All layers (For reference: thickest traces are 2.5 mm / ~98.4 mils; thinnest traces are 0.25 mm / ~9.84 mils): \n
\n
PCB Front layers excluding Silkscreen: \n
\n
PCB Back layers + Front Fab layer: 
"""
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date: 2023-09-18 14:09:38.0 +02:00
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I haven’t got enough time on my hands right now to review the whole desingn, but one thing that jumps to mind is that you’ll want to use an antiparallel diode on each relay coil to suppress the negative voltage spikes when switching it off.\n
\n
Be sure to keep adequate distance between high and low voltage traces. The ground plane seems awfully close to the N trace.\n
\n
Other than that, I’d happily welcome more PCB and/or personal project discussions!
"""
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Show voter details
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33 |
DENIED
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ROLE_USER
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null |
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Show voter details
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34 |
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moderate
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App\Entity\EntryComment {#1596
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+slug: "PCB-Design-Review-Request-ESP32-Smart-Relay-Board"
+title: "PCB Design Review Request: ESP32 Smart Relay Board"
+url: null
+body: """
Hi, this post is structured similarly to r/PrintedCircuitBoard 's review request format. Since we don’t have any PCB communities over here yet, I thought that this might fit in here and can maybe spark some friendly discussion.\n
\n
This is a relay board controlling electrically driven windows and blinds. For this purpose it has some additional connectors to a weather station, interior sensors and an LCD screen.\n
\n
It is replacing a ~20 year old board that has started to develop some annoying quirks. I’ve mostly copied what the original board did and adjusted it for the ESP32. This is not a production board and if all goes well, I will only ever assemble a single one of these.\n
\n
The primary usage scenario is that the MCU will monitor the weather station and then actuate the motor groups (M1 - M6 connected on `J3` - `J8`) to keep the indoors temperature and humidity in check.\n
\n
At least during summer time the board will likely run 24/7 and will hopefully be used for a number of years. For maintenance reasons I’ve tried to keep it simple and the component count low.\n
\n
Mains power is supplied from `J1` and being fed to the motors via the relays. `PS1` converts the line voltage to +5V DC for the relay coils and some auxiliary components. The switching regulator `U2` steps that down to +3.3V for the MCU `U1` and IO Expander `U3`.\n
\n
The board size is mostly constrained by the preexisting mounting holes which gives me plenty of space to work with even with just a 2 layer board. The enclosure containing the mounts is installed indoors and is finger-pokey-tight.\n
\n
Jumper `JP1` allows me to supply the MCU devkit daughter board with +5V, should I ever replace it with a different one. Similarly `J11` exists for future expansion.\n
\n
`J10` mounts another daughter board (not included in review) facilitating communications with the weather station. Should the station ever need to be replaced I can swap in a new, matching board.\n
\n
There aren’t any high-speed connections on the board. The fastest one is likely the SPI connection to the LCD controller but I can slow it down in firmware if necessary.\n
\n
Regarding the DNP components: There are only 5 motors installed at the moment so I will cover the sixth slot with a piece of plastic for now. `R1` and `R2` will only be populated if the 10k pullup resistors integrated into the MCU are insufficient for typical baud rates.\n
\n
While it is not the first board I’ve designed, it is the first one carrying mains power (European grid 230V@50Hz). I’m using 2 oz copper to accommodate the motor currents within reasonably wide traces.\n
\n
In case anyone is interested, it will be running the ESPHome firmware to easily integrate with the Home-Assistant smart home solution. This also pushes firmware maintenance from me onto the ESPHome devs.\n
\n
3D render from front (no 3D model for relays `K**` and MCU board; 3D model for `J1` and `J2` is a stand-in of same outer dimensions): \n
\n
Orthographic view from front: \n
\n
Schematic:\n
\n
\n
\n
PCB All layers (For reference: thickest traces are 2.5 mm / ~98.4 mils; thinnest traces are 0.25 mm / ~9.84 mils): \n
\n
PCB Front layers excluding Silkscreen: \n
\n
PCB Back layers + Front Fab layer: 
"""
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}
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I haven’t got enough time on my hands right now to review the whole desingn, but one thing that jumps to mind is that you’ll want to use an antiparallel diode on each relay coil to suppress the negative voltage spikes when switching it off.\n
\n
Be sure to keep adequate distance between high and low voltage traces. The ground plane seems awfully close to the N trace.\n
\n
Other than that, I’d happily welcome more PCB and/or personal project discussions!
"""
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date: 2023-09-18 08:38:54.0 +02:00
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"@Starfighter@discuss.tchncs.de"
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date: 2023-09-17 22:48:48.0 +02:00
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+"title": 29287
} |
|
Show voter details
|
35 |
DENIED
|
edit
|
App\Entity\EntryComment {#1596
+user: App\Entity\User {#261 …}
+entry: Proxies\__CG__\App\Entity\Entry {#1604
+user: Proxies\__CG__\App\Entity\User {#2013 …}
+magazine: Proxies\__CG__\App\Entity\Magazine {#1575 …}
+image: null
+domain: Proxies\__CG__\App\Entity\Domain {#2328 …}
+slug: "PCB-Design-Review-Request-ESP32-Smart-Relay-Board"
+title: "PCB Design Review Request: ESP32 Smart Relay Board"
+url: null
+body: """
Hi, this post is structured similarly to r/PrintedCircuitBoard 's review request format. Since we don’t have any PCB communities over here yet, I thought that this might fit in here and can maybe spark some friendly discussion.\n
\n
This is a relay board controlling electrically driven windows and blinds. For this purpose it has some additional connectors to a weather station, interior sensors and an LCD screen.\n
\n
It is replacing a ~20 year old board that has started to develop some annoying quirks. I’ve mostly copied what the original board did and adjusted it for the ESP32. This is not a production board and if all goes well, I will only ever assemble a single one of these.\n
\n
The primary usage scenario is that the MCU will monitor the weather station and then actuate the motor groups (M1 - M6 connected on `J3` - `J8`) to keep the indoors temperature and humidity in check.\n
\n
At least during summer time the board will likely run 24/7 and will hopefully be used for a number of years. For maintenance reasons I’ve tried to keep it simple and the component count low.\n
\n
Mains power is supplied from `J1` and being fed to the motors via the relays. `PS1` converts the line voltage to +5V DC for the relay coils and some auxiliary components. The switching regulator `U2` steps that down to +3.3V for the MCU `U1` and IO Expander `U3`.\n
\n
The board size is mostly constrained by the preexisting mounting holes which gives me plenty of space to work with even with just a 2 layer board. The enclosure containing the mounts is installed indoors and is finger-pokey-tight.\n
\n
Jumper `JP1` allows me to supply the MCU devkit daughter board with +5V, should I ever replace it with a different one. Similarly `J11` exists for future expansion.\n
\n
`J10` mounts another daughter board (not included in review) facilitating communications with the weather station. Should the station ever need to be replaced I can swap in a new, matching board.\n
\n
There aren’t any high-speed connections on the board. The fastest one is likely the SPI connection to the LCD controller but I can slow it down in firmware if necessary.\n
\n
Regarding the DNP components: There are only 5 motors installed at the moment so I will cover the sixth slot with a piece of plastic for now. `R1` and `R2` will only be populated if the 10k pullup resistors integrated into the MCU are insufficient for typical baud rates.\n
\n
While it is not the first board I’ve designed, it is the first one carrying mains power (European grid 230V@50Hz). I’m using 2 oz copper to accommodate the motor currents within reasonably wide traces.\n
\n
In case anyone is interested, it will be running the ESPHome firmware to easily integrate with the Home-Assistant smart home solution. This also pushes firmware maintenance from me onto the ESPHome devs.\n
\n
3D render from front (no 3D model for relays `K**` and MCU board; 3D model for `J1` and `J2` is a stand-in of same outer dimensions): \n
\n
Orthographic view from front: \n
\n
Schematic:\n
\n
\n
\n
PCB All layers (For reference: thickest traces are 2.5 mm / ~98.4 mils; thinnest traces are 0.25 mm / ~9.84 mils): \n
\n
PCB Front layers excluding Silkscreen: \n
\n
PCB Back layers + Front Fab layer: 
"""
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]
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date: 2023-09-18 12:05:18.0 +02:00
}
+createdAt: DateTimeImmutable @1694982780 {#2081
date: 2023-09-17 22:33:00.0 +02:00
}
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…2
}
+magazine: Proxies\__CG__\App\Entity\Magazine {#1575 …}
+image: null
+parent: null
+root: null
+body: """
I haven’t got enough time on my hands right now to review the whole desingn, but one thing that jumps to mind is that you’ll want to use an antiparallel diode on each relay coil to suppress the negative voltage spikes when switching it off.\n
\n
Be sure to keep adequate distance between high and low voltage traces. The ground plane seems awfully close to the N trace.\n
\n
Other than that, I’d happily welcome more PCB and/or personal project discussions!
"""
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+isAdult: false
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+score: 0
+lastActive: DateTime @1695019134 {#1702
date: 2023-09-18 08:38:54.0 +02:00
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"@Starfighter@discuss.tchncs.de"
]
+children: Doctrine\ORM\PersistentCollection {#1613 …}
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-id: 29287
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date: 2023-09-17 22:48:48.0 +02:00
}
+"title": 29287
} |
|
Show voter details
|
36 |
DENIED
|
moderate
|
App\Entity\EntryComment {#1596
+user: App\Entity\User {#261 …}
+entry: Proxies\__CG__\App\Entity\Entry {#1604
+user: Proxies\__CG__\App\Entity\User {#2013 …}
+magazine: Proxies\__CG__\App\Entity\Magazine {#1575 …}
+image: null
+domain: Proxies\__CG__\App\Entity\Domain {#2328 …}
+slug: "PCB-Design-Review-Request-ESP32-Smart-Relay-Board"
+title: "PCB Design Review Request: ESP32 Smart Relay Board"
+url: null
+body: """
Hi, this post is structured similarly to r/PrintedCircuitBoard 's review request format. Since we don’t have any PCB communities over here yet, I thought that this might fit in here and can maybe spark some friendly discussion.\n
\n
This is a relay board controlling electrically driven windows and blinds. For this purpose it has some additional connectors to a weather station, interior sensors and an LCD screen.\n
\n
It is replacing a ~20 year old board that has started to develop some annoying quirks. I’ve mostly copied what the original board did and adjusted it for the ESP32. This is not a production board and if all goes well, I will only ever assemble a single one of these.\n
\n
The primary usage scenario is that the MCU will monitor the weather station and then actuate the motor groups (M1 - M6 connected on `J3` - `J8`) to keep the indoors temperature and humidity in check.\n
\n
At least during summer time the board will likely run 24/7 and will hopefully be used for a number of years. For maintenance reasons I’ve tried to keep it simple and the component count low.\n
\n
Mains power is supplied from `J1` and being fed to the motors via the relays. `PS1` converts the line voltage to +5V DC for the relay coils and some auxiliary components. The switching regulator `U2` steps that down to +3.3V for the MCU `U1` and IO Expander `U3`.\n
\n
The board size is mostly constrained by the preexisting mounting holes which gives me plenty of space to work with even with just a 2 layer board. The enclosure containing the mounts is installed indoors and is finger-pokey-tight.\n
\n
Jumper `JP1` allows me to supply the MCU devkit daughter board with +5V, should I ever replace it with a different one. Similarly `J11` exists for future expansion.\n
\n
`J10` mounts another daughter board (not included in review) facilitating communications with the weather station. Should the station ever need to be replaced I can swap in a new, matching board.\n
\n
There aren’t any high-speed connections on the board. The fastest one is likely the SPI connection to the LCD controller but I can slow it down in firmware if necessary.\n
\n
Regarding the DNP components: There are only 5 motors installed at the moment so I will cover the sixth slot with a piece of plastic for now. `R1` and `R2` will only be populated if the 10k pullup resistors integrated into the MCU are insufficient for typical baud rates.\n
\n
While it is not the first board I’ve designed, it is the first one carrying mains power (European grid 230V@50Hz). I’m using 2 oz copper to accommodate the motor currents within reasonably wide traces.\n
\n
In case anyone is interested, it will be running the ESPHome firmware to easily integrate with the Home-Assistant smart home solution. This also pushes firmware maintenance from me onto the ESPHome devs.\n
\n
3D render from front (no 3D model for relays `K**` and MCU board; 3D model for `J1` and `J2` is a stand-in of same outer dimensions): \n
\n
Orthographic view from front: \n
\n
Schematic:\n
\n
\n
\n
PCB All layers (For reference: thickest traces are 2.5 mm / ~98.4 mils; thinnest traces are 0.25 mm / ~9.84 mils): \n
\n
PCB Front layers excluding Silkscreen: \n
\n
PCB Back layers + Front Fab layer: 
"""
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date: 2023-09-18 12:05:18.0 +02:00
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date: 2023-09-17 22:33:00.0 +02:00
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…2
}
+magazine: Proxies\__CG__\App\Entity\Magazine {#1575 …}
+image: null
+parent: null
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+body: """
I haven’t got enough time on my hands right now to review the whole desingn, but one thing that jumps to mind is that you’ll want to use an antiparallel diode on each relay coil to suppress the negative voltage spikes when switching it off.\n
\n
Be sure to keep adequate distance between high and low voltage traces. The ground plane seems awfully close to the N trace.\n
\n
Other than that, I’d happily welcome more PCB and/or personal project discussions!
"""
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date: 2023-09-17 22:48:48.0 +02:00
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+"title": 29287
} |
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Show voter details
|
37 |
DENIED
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ROLE_USER
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null |
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Show voter details
|
38 |
DENIED
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moderate
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App\Entity\EntryComment {#1559
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+domain: Proxies\__CG__\App\Entity\Domain {#2328 …}
+slug: "PCB-Design-Review-Request-ESP32-Smart-Relay-Board"
+title: "PCB Design Review Request: ESP32 Smart Relay Board"
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+body: """
Hi, this post is structured similarly to r/PrintedCircuitBoard 's review request format. Since we don’t have any PCB communities over here yet, I thought that this might fit in here and can maybe spark some friendly discussion.\n
\n
This is a relay board controlling electrically driven windows and blinds. For this purpose it has some additional connectors to a weather station, interior sensors and an LCD screen.\n
\n
It is replacing a ~20 year old board that has started to develop some annoying quirks. I’ve mostly copied what the original board did and adjusted it for the ESP32. This is not a production board and if all goes well, I will only ever assemble a single one of these.\n
\n
The primary usage scenario is that the MCU will monitor the weather station and then actuate the motor groups (M1 - M6 connected on `J3` - `J8`) to keep the indoors temperature and humidity in check.\n
\n
At least during summer time the board will likely run 24/7 and will hopefully be used for a number of years. For maintenance reasons I’ve tried to keep it simple and the component count low.\n
\n
Mains power is supplied from `J1` and being fed to the motors via the relays. `PS1` converts the line voltage to +5V DC for the relay coils and some auxiliary components. The switching regulator `U2` steps that down to +3.3V for the MCU `U1` and IO Expander `U3`.\n
\n
The board size is mostly constrained by the preexisting mounting holes which gives me plenty of space to work with even with just a 2 layer board. The enclosure containing the mounts is installed indoors and is finger-pokey-tight.\n
\n
Jumper `JP1` allows me to supply the MCU devkit daughter board with +5V, should I ever replace it with a different one. Similarly `J11` exists for future expansion.\n
\n
`J10` mounts another daughter board (not included in review) facilitating communications with the weather station. Should the station ever need to be replaced I can swap in a new, matching board.\n
\n
There aren’t any high-speed connections on the board. The fastest one is likely the SPI connection to the LCD controller but I can slow it down in firmware if necessary.\n
\n
Regarding the DNP components: There are only 5 motors installed at the moment so I will cover the sixth slot with a piece of plastic for now. `R1` and `R2` will only be populated if the 10k pullup resistors integrated into the MCU are insufficient for typical baud rates.\n
\n
While it is not the first board I’ve designed, it is the first one carrying mains power (European grid 230V@50Hz). I’m using 2 oz copper to accommodate the motor currents within reasonably wide traces.\n
\n
In case anyone is interested, it will be running the ESPHome firmware to easily integrate with the Home-Assistant smart home solution. This also pushes firmware maintenance from me onto the ESPHome devs.\n
\n
3D render from front (no 3D model for relays `K**` and MCU board; 3D model for `J1` and `J2` is a stand-in of same outer dimensions): \n
\n
Orthographic view from front: \n
\n
Schematic:\n
\n
\n
\n
PCB All layers (For reference: thickest traces are 2.5 mm / ~98.4 mils; thinnest traces are 0.25 mm / ~9.84 mils): \n
\n
PCB Front layers excluding Silkscreen: \n
\n
PCB Back layers + Front Fab layer: 
"""
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I haven’t got enough time on my hands right now to review the whole desingn, but one thing that jumps to mind is that you’ll want to use an antiparallel diode on each relay coil to suppress the negative voltage spikes when switching it off.\n
\n
Be sure to keep adequate distance between high and low voltage traces. The ground plane seems awfully close to the N trace.\n
\n
Other than that, I’d happily welcome more PCB and/or personal project discussions!
"""
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…2
}
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date: 2023-09-18 08:38:52.0 +02:00
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+"title": 29292
} |
|
Show voter details
|
39 |
DENIED
|
edit
|
App\Entity\EntryComment {#1559
+user: App\Entity\User {#261 …}
+entry: Proxies\__CG__\App\Entity\Entry {#1604
+user: Proxies\__CG__\App\Entity\User {#2013 …}
+magazine: Proxies\__CG__\App\Entity\Magazine {#1575 …}
+image: null
+domain: Proxies\__CG__\App\Entity\Domain {#2328 …}
+slug: "PCB-Design-Review-Request-ESP32-Smart-Relay-Board"
+title: "PCB Design Review Request: ESP32 Smart Relay Board"
+url: null
+body: """
Hi, this post is structured similarly to r/PrintedCircuitBoard 's review request format. Since we don’t have any PCB communities over here yet, I thought that this might fit in here and can maybe spark some friendly discussion.\n
\n
This is a relay board controlling electrically driven windows and blinds. For this purpose it has some additional connectors to a weather station, interior sensors and an LCD screen.\n
\n
It is replacing a ~20 year old board that has started to develop some annoying quirks. I’ve mostly copied what the original board did and adjusted it for the ESP32. This is not a production board and if all goes well, I will only ever assemble a single one of these.\n
\n
The primary usage scenario is that the MCU will monitor the weather station and then actuate the motor groups (M1 - M6 connected on `J3` - `J8`) to keep the indoors temperature and humidity in check.\n
\n
At least during summer time the board will likely run 24/7 and will hopefully be used for a number of years. For maintenance reasons I’ve tried to keep it simple and the component count low.\n
\n
Mains power is supplied from `J1` and being fed to the motors via the relays. `PS1` converts the line voltage to +5V DC for the relay coils and some auxiliary components. The switching regulator `U2` steps that down to +3.3V for the MCU `U1` and IO Expander `U3`.\n
\n
The board size is mostly constrained by the preexisting mounting holes which gives me plenty of space to work with even with just a 2 layer board. The enclosure containing the mounts is installed indoors and is finger-pokey-tight.\n
\n
Jumper `JP1` allows me to supply the MCU devkit daughter board with +5V, should I ever replace it with a different one. Similarly `J11` exists for future expansion.\n
\n
`J10` mounts another daughter board (not included in review) facilitating communications with the weather station. Should the station ever need to be replaced I can swap in a new, matching board.\n
\n
There aren’t any high-speed connections on the board. The fastest one is likely the SPI connection to the LCD controller but I can slow it down in firmware if necessary.\n
\n
Regarding the DNP components: There are only 5 motors installed at the moment so I will cover the sixth slot with a piece of plastic for now. `R1` and `R2` will only be populated if the 10k pullup resistors integrated into the MCU are insufficient for typical baud rates.\n
\n
While it is not the first board I’ve designed, it is the first one carrying mains power (European grid 230V@50Hz). I’m using 2 oz copper to accommodate the motor currents within reasonably wide traces.\n
\n
In case anyone is interested, it will be running the ESPHome firmware to easily integrate with the Home-Assistant smart home solution. This also pushes firmware maintenance from me onto the ESPHome devs.\n
\n
3D render from front (no 3D model for relays `K**` and MCU board; 3D model for `J1` and `J2` is a stand-in of same outer dimensions): \n
\n
Orthographic view from front: \n
\n
Schematic:\n
\n
\n
\n
PCB All layers (For reference: thickest traces are 2.5 mm / ~98.4 mils; thinnest traces are 0.25 mm / ~9.84 mils): \n
\n
PCB Front layers excluding Silkscreen: \n
\n
PCB Back layers + Front Fab layer: 
"""
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I haven’t got enough time on my hands right now to review the whole desingn, but one thing that jumps to mind is that you’ll want to use an antiparallel diode on each relay coil to suppress the negative voltage spikes when switching it off.\n
\n
Be sure to keep adequate distance between high and low voltage traces. The ground plane seems awfully close to the N trace.\n
\n
Other than that, I’d happily welcome more PCB and/or personal project discussions!
"""
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|
Show voter details
|
40 |
DENIED
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moderate
|
App\Entity\EntryComment {#1559
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+slug: "PCB-Design-Review-Request-ESP32-Smart-Relay-Board"
+title: "PCB Design Review Request: ESP32 Smart Relay Board"
+url: null
+body: """
Hi, this post is structured similarly to r/PrintedCircuitBoard 's review request format. Since we don’t have any PCB communities over here yet, I thought that this might fit in here and can maybe spark some friendly discussion.\n
\n
This is a relay board controlling electrically driven windows and blinds. For this purpose it has some additional connectors to a weather station, interior sensors and an LCD screen.\n
\n
It is replacing a ~20 year old board that has started to develop some annoying quirks. I’ve mostly copied what the original board did and adjusted it for the ESP32. This is not a production board and if all goes well, I will only ever assemble a single one of these.\n
\n
The primary usage scenario is that the MCU will monitor the weather station and then actuate the motor groups (M1 - M6 connected on `J3` - `J8`) to keep the indoors temperature and humidity in check.\n
\n
At least during summer time the board will likely run 24/7 and will hopefully be used for a number of years. For maintenance reasons I’ve tried to keep it simple and the component count low.\n
\n
Mains power is supplied from `J1` and being fed to the motors via the relays. `PS1` converts the line voltage to +5V DC for the relay coils and some auxiliary components. The switching regulator `U2` steps that down to +3.3V for the MCU `U1` and IO Expander `U3`.\n
\n
The board size is mostly constrained by the preexisting mounting holes which gives me plenty of space to work with even with just a 2 layer board. The enclosure containing the mounts is installed indoors and is finger-pokey-tight.\n
\n
Jumper `JP1` allows me to supply the MCU devkit daughter board with +5V, should I ever replace it with a different one. Similarly `J11` exists for future expansion.\n
\n
`J10` mounts another daughter board (not included in review) facilitating communications with the weather station. Should the station ever need to be replaced I can swap in a new, matching board.\n
\n
There aren’t any high-speed connections on the board. The fastest one is likely the SPI connection to the LCD controller but I can slow it down in firmware if necessary.\n
\n
Regarding the DNP components: There are only 5 motors installed at the moment so I will cover the sixth slot with a piece of plastic for now. `R1` and `R2` will only be populated if the 10k pullup resistors integrated into the MCU are insufficient for typical baud rates.\n
\n
While it is not the first board I’ve designed, it is the first one carrying mains power (European grid 230V@50Hz). I’m using 2 oz copper to accommodate the motor currents within reasonably wide traces.\n
\n
In case anyone is interested, it will be running the ESPHome firmware to easily integrate with the Home-Assistant smart home solution. This also pushes firmware maintenance from me onto the ESPHome devs.\n
\n
3D render from front (no 3D model for relays `K**` and MCU board; 3D model for `J1` and `J2` is a stand-in of same outer dimensions): \n
\n
Orthographic view from front: \n
\n
Schematic:\n
\n
\n
\n
PCB All layers (For reference: thickest traces are 2.5 mm / ~98.4 mils; thinnest traces are 0.25 mm / ~9.84 mils): \n
\n
PCB Front layers excluding Silkscreen: \n
\n
PCB Back layers + Front Fab layer: 
"""
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I haven’t got enough time on my hands right now to review the whole desingn, but one thing that jumps to mind is that you’ll want to use an antiparallel diode on each relay coil to suppress the negative voltage spikes when switching it off.\n
\n
Be sure to keep adequate distance between high and low voltage traces. The ground plane seems awfully close to the N trace.\n
\n
Other than that, I’d happily welcome more PCB and/or personal project discussions!
"""
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