My system (me) is shutting down from all this reading, so please bear with me. I'm more mechanical than electrical. It seems everybody has Gecko. My BOB is from Build Your Own CNC. I guess it's proprietary and I can't seem to find anyone using it with the SPID and I'm so afraid to wire it wrong and burn it out. Can someone look at the PDF and tell me which output pins to use? and where to connect them? And the grounding issue. How? The output pins I am not using are pins 1, 8, 9, 14, and 17. Once I figure this part out then I will consider switches. I know I need a lot of help, so thank you.