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Hi! this is an awesome project with great instruction. I have wired the arduino according to the diagrams (at least I think I have) with the only differences being that I have used single LEDs rather than a matrix and I am using the Uno rather than the Nano, but it seems to be fairly unresponsive other than both coloured LEDs energizing when I touch one of the guard pins every once in a while. Any ideas on where I am going wrong?