Thanks for a great guide!
I'm not sure I completely understand how the hdmi-usb adaptor powers the pi. Does the usb have to be plugged in on the TV-side of the cable, or does your modification mean you can power the pi directly from the hdmi plug?
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Hi! Please excuse my noob question, this is my first project and my first arduino, so bear with me. I don't seem to get the order of my pins right. I know you list it in the beginning of your code, but can you (or someone else) be even more specific? What button is going where? Up is 2, down is 4?.....