Custom RepRap Button

Hey,

I am wanting to add a normal push button to a 3D printer and for it to perform 1 single G-Code command.

However, from what I can find I cannot see any ways of doing this.

Does anyone know how to do this?

As for wiring I think I could use 1 of the 3 end-stop slots I am not currently using (or indeed servo pins).

Thanks, Alex

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This is pretty easy, you can look at other G/M Codes in Marlin_Main.cpp (if you are using Marlin) and copy and paste to get what you want. When I was playing with autoleveling, I had Marlin take an output on the Mega High/Low with G29 and then use an input for other things. There are many I/O pins not used on the Mega that you can use.