I have an adafruit Feather nRF52840 it was gotten to improve my cat's toy. It will be connected to the toys battery and must electronically short one other pin to ground. My question is, is there a certain pin or selection of pins I can use, Or do I tell my friend who's working on the software side the pin I chose and pick any but the ones for a battery?
Also. can the adafruit Feather nRF52840 recharge a battery attached to it or should I get a charger?