I am planning my RC build and I’d like to hook up two servos with an analog feedback to the ADC on Navio. From what I understand the ADC runs at a reference voltage of 3.3v, but the servo runs at 5v so I’m imagining that the analog output can be anywhere from 0-5v.
What is a good way to step down the voltage? Would a simple voltage divider with something like R1 of 10kOhm and R2 of 20kOhm work?
That power module is calibrated for a 5V ADC, which means that at max current it will show voltage of 5V on current measuring pin and 5V at voltage measuring pin. At zero current and voltage it will show 0V on both pins. Navio+ can only accept up to 3.3V on its ADC, so you need to account for that. Simply scale the max range of the power module, 3.3V/5V = 0.66 . So for Navio+ ADC max input of that power module will be 0.66 * 42V = 27V. Same with current.