I am working on a drone now and we want to implement a DC voltage and current sensing board to log the flight data onto a SD card. We have two attopilot 180A/50V to work with. The datasheet says that it will scale a 50V input down to a 3.3 V signal so ADC can be done to determine the respective levels on the battery and load.
The problem is that at no load conditions the sensing voltage is scaled down with a ratio of 4:1 instead of 15.7:1 as the datasheet says.
I dont know if it us the previous guy's soldering that may have made a short, but it is consistent over both boards we have. Does anyone have any experience on this?
