Hi Alex,
Thank you for responding. I think I understand but to clarify a few things:
1) on the 6 relay 5vDC module found on eBay, the inputs from the control panel (for 6 track blocks) plus the 2 wires for the 5 volt power (pos & neg) attach to the 8 pins on the longer side of the module. Correct? I assume the pins will be marked as to what goes where.
2) I would need a 5v DC power supply to drive the relays. Correct?
3) Can you recommend a 5v power supply?
So, my daughter-in-law maybe mad at me. I showed my son your post here on Sunday and all he has done since is read it. He also showed his colleagues at work. He is a mechanical engineer and is fascinated by what you have done!
Again, I thank you for sharing what you have done and for helping me with my questions.
Mike