Voltage monitor on APM2

I want to get the pack voltage reported in the telemetry just for testing, I'm running 4S setup with the APM2,

I don't have the relatively new voltage/current monitor, to use it I'd have to do a lot of stripping to get to the power system, but I'd like to monitor just the Pack voltage for a couple of flights via the telemetry downlink.

Is there a way to do this on the APM2 without the power board adapter ?

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  • Small voltage divider with Attopilot resistor values. 1K to GND, 10K + 4K7 in series to VCC. Toss in a small capacitor to smooth out the readings, a 100 nF will do fine. If you have trouble reaching power distribution, you can steal pack voltage from the balancing connector.

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