brendan

@brendan@mastodon.brendans-bits.com

A PhD candidate and tinkerer, interested in #FreeBSD #rust #rustlang #CriticalRealism

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How to improve my battery measurement circuit?

I am powering a 5V microcontroller (arduino clone, atmega328p) using a 9V block and a buck converter. Now I want to let the microcontroller occasionally measure the battery voltage, so I can get an idea of how full it is....

brendan, 1 year ago

@nilclass

@WaterWaiver

From the stack exchange post: " 10 kΩ or less source resistance is recommended, otherwise the low pass filter effect of the capacitor with the source resistance becomes a major issue, requiring a longer sampling time for conversion and as a result limiting the maximum frequency."

In other words: a higher source impedance (caused by large resistors) is only going to drastically affect the results when you need to take fast repeated measurements (e.g. an AC source)

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