I cannot get a clear answer to how to do this. I do not need to measure currrent, I just want to know main pack voltage. What is the native voltage range of the APM2.0 voltage input slot? I can't figure out if it is 3.3V or 5V. I plane to make a simple voltage divider to scale the pack votage down to the right value.
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Brian maximum voltage that you can put in to CPU is 5 volts. You can use for example AttoPilot90 board to measure voltage/current and then just connect them as shown in APM2.0 manual.
You can also make your own voltage divider if you just want to measure voltages. On APM1 we did use 10k/3.9k 1% resistors for voltage divider.
jani / jDrones