Testing the micro:bit analog inputs #microbit @MonkMakes @SimonMonk2

Dr. Monk’s DIY Electronics Blog examines the micro:bit analog inputs:

You might think, that as long as you are careful to to exceed the 3V input voltage limit, then you can measure any low voltage whatever the source. Perhaps a photoresistor in a voltage divider arrangement with a fixed resistor.

While this is basically true, if the source of the voltage to be measured has a high output impedance, at some point the voltage measured by the micro:bit will diverge from reality as the impedance of the voltage source being measured increases.

The micro:bit does pretty well up until a value of R of 10kΩ after which it goes down hill pretty rapidly.
If you want to use your micro:bit to measure a voltage, try and keep the output impedance of the voltage source lower than 10kΩ.
See the testing methodology in the blog post here.


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