I was thrilled to get my hands on a FetaDuino from Rocket Brand Studios. Only now I think I have damaged it.
I was wiring in a swich on the GPIO pins. I had the switch wired to a 3-pin header, with the switch common going to the signal line, normally connected (NC) going to +5V, and normally open (NO) going to GND.
Com <-> Signal
NC <-> +5V