I'm trying to build a unit to display the USB voltage. I've tried the "secret voltmeter" - see my other post. This is a different approach. I have connected an analog input pin (A9) to Vcc (the pin on the Micro Pro board) via a 3.3:1 potential divider. (Vcc - 33k - A9 - 10k - GND) The USB voltage…

Measuring USB voltage with 32U4 and potential divider

Paul_B September 15, 2019, 10:14pm 7

johnerrington:
Link to other thread:

Secret voltmeter on Pro Micro (32U4) - Project Guidance - Arduino Forum

Then why are you cross posting?

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