I don't really care for the 3.3 volt I/O of the Pi, but here's a good overview of the interfacing available. https://learn.sparkfun.com/tutorials/introduction-

I don't really care for the 3.3 volt I/O of the Pi, but here's a good overview of the interfacing available. https://learn.sparkfun.com/tutorials/introduction-to-the-raspberry-pi-gpio-and-physical-computing/gpio-pins-overview https://learn.sparkfun.com/tutorials/introduction-to-the-ras...