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  • That is awesome. Commented Sep 25, 2012 at 18:05
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    Instead of an input for each key you can use a matrix and use the 18 inputs to handle 81 keys (a 9x9 matrix) as far as I know the RPi has fewer inputs than the arduino so I don't think it will help. Commented Sep 25, 2012 at 19:35
  • @Craig so you mean combining inputs like this: arduino.cc/playground/Main/KeypadTutorial Commented Sep 25, 2012 at 19:58
  • @sventech yes. I'm not familiar with the makey makey so I don't know how its high resistance switching will interact with the matrix. Commented Sep 25, 2012 at 20:30