I'm working on an automation system for my hobby model train system, n-scale.
I have developed a Arduino based circuit that uses IR sensors and shift registers to detect train position and then uses an h-bridge circuit to send forward/reverse DC power to throw track switches (turnouts) to divert the train down one track or another based on the Arduino programming.
Some of my track switches (turnouts) are actually controlled by small hobby DC motors; however my issue that I want to solve involves some of the track switches which are actually AC based, 3 wire electric switches. I'm not sure how to integrate these into my DC based system.
I know you don't know anything of my system, but at its basics, I can control numerous sets (pairs) of DC +/- wires going to each of the DC switches/turnouts, and I can reverse the DC polarity on those pairs of wires so as to throw a switch in forward or reverse.
Now the AC switches are 3 wired. Here is a link to a installation instruction picture which will give a good understand of how they are wired; mine are just like this. The real information is the wiring diagram at the bottom. http://www.nscalesupply.com/atl/ATL-65.html
The control switches are those buttons on the "switch control box", which are sliders, left/right and press to activate the power. So the slider buttons control direction the track switch will move. You'll notice they are powered from the AC power pack via 2 wires. This further confuses me because I thought AC was "alternating" current, so I didn't think a motor could be made to spin opposite direction by flipping the wires around, like a DC circuit would.
Nevertheless ... how might I deal with these 3-wire AC switches in my DC based system, which uses h-bridge design to reverse DC power?
Ideally I would like to just expand on my DC h-bridge controlled DC power and send that to the AC switches. Might this work if wired properly?
How would 2-wire DC be wired to those 3-wire AC switches?
Thanks for reading, and looking forward to any input or comments.