I have noticed that while hooking up arcade buttons to the GPIO set on the model b board that along with the joystick I should be able (by assigning certain GPIO pins to ground) to connect 7 other buttons with individual grounds. However if I could attach multiple inputs to the same couple of ground pins (probably something rough like soldering the ground wires together) I could connect something like 11 buttons. Would it be likely for this to cause an issue with the input buttons? I am very new to this sort of thing, thank you for your time.

1 Answer 1


you need only 1 (one) ground pin for does not matter how many input buttons. there's absolutely no reason to use any other pin as a ground as long as you have one already used.

  • Excellent, That is what I was hoping to hear. Thank you.
    – Caritaspax
    Apr 13, 2014 at 17:22
  • You could also hook them up to an Arduino, and then send that data via USB. Apr 14, 2014 at 0:53

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.