I used to think emojis were odd, but now I really like them. They are so clear. I can't read emotions from faces, except for emotional vs not emotional. But emojis are easier. I wish people looked more like emojis. 😊
It actually depends, on longer posts they somehow disturb the reading flow for me (because they are kind of distracting compared to plain text). For short comments on the other hand I like them and find them rather refreshing.
The Nano’s PWM frequency can be adjusted from the default 490 Hz, with a maximum of 4MHz, at which point the resolution is 4. At a resolution of 256 (which is more than enough for this application), the maximum PWM frequency is 62.5 kHz, which is far outside our hearing range, though can still barely be heard by some younger cats
I did some further reading into this and found out the PWM pins I’m using are controlled by their own separate timer (instead of the one used by the Arduino core for millis(), micros() etc) so definitely will be trying this out the next time I rip the cooler open 😁
Just as a PCB designer, make sure that you spec out the 240V voltage neutral and live copper trace width to the current going through them. For example, at 10 amps, those traces look much too small. Is it going to be in a high humidity environment? The spacing between traces also should be bigger for creepage/clearance reasons.
Yes the traces are pretty light for those kinds of currents, and I did have some concerns on the track spacing around the SCR and the screw terminals. The fatter tracks use a spacing for 240v that I looked up online.
Humidity here isn’t “tropical” as such, the board will probably get a coat of lacquer anyway.
The circulating pump is rated at 240v/20 watts (so not much current when it’s running steady state), and the SCR I’m using is good for a few amps of continuous current draw with a fairly high surge current. The SCR has minimal heatsinking so it will go first in extended high current situations, there’s going to be a panel mount fuse before all of this that I’ll probably set to 2 amps or so.
The zero-crossing SCR controller I’m using “should” prevent switching on the pump at the peaks of the mains cycle so max current should just be the initial stall current from the motor before it gets up to speed.
The pump is an induction motor so the only concern I’ve got is false triggering of the SCR and being unable to turn the pump off once triggered. I used an example snubber circuit from the data sheet of the zero crossing controller and of course they said “your milage may vary”.
This makes sense only if you’re rolling your own silicon, and it depends on the application. I could see this as an alternative to a scalar DSP core or to provide more flexible high speed interfaces. The unspoken cost is going to be adding another proprietary set of tooling in the BSP for your chip.
I’d say that’s a version of a soft termination capacitor. They are used when there’s risk the board is flexed or exposed to mechanical or thermal shocks to prevent cracks in the capacitor (causing it to fail short).
They are called soft termination, I’m not sure if that’s available for every component, it came to my attention on ceramic caps. It’s a dedicated feature you can filter components e.g. on Digikey.
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