Hi! How are you doing to monitor the voltage of two batteries connected in parallel on the same distribution board?
One option would be to connect the power module to the cell balancing cable, but I would like to know how you are doing it.
Another point, about the GPS.
I am merging information from two GPS units that I have to the drone, to avoid abrupt changes when the number of satellites varies.
But the question is: What action will the controller take when one of the modules fails? In option the best I know that the defective module will be disregarded, but what happens with the blend option is selected?