Cyntech touch4pi hat with capacitive touch and rgb leds for raspberry pi cyntech touch4pi hat if you want more interactivity with your games and applications then add the touch4pi hat with its four capacitive touch pads each with its own led allowing visual feedback when pressed there are many things you can do with the touch4pi hat including creating a safe combination lock for your raspberry pi creating a memory game playing against a computer in a game of mastermind and much more