So I needed a way to map the RC receiver’s two sets of motor control wires, which can have either positive or negative voltages across them, to the Arduino pins which only want positive voltages.

There are actually quite a few basic Arduino videos on the channel ... high or low values to make the average voltage either positive (forward) or negative (reverse). This can heat up DC motors ...

All Arduino boards have this pin, and it's connected to the built-in voltage regulator that makes ... wire and your Nano's GND pin to the supply's negative wire. One common mistake beginners ...