- Dec 7, 2010
Good god, no one wants to wire up 47 relays to turn a motor, Sean. That's when you give up and switch to arduino.
Here's what I came up with. It's basically a low-tech H-bridge to switch polarity. One obvious weakness is that it shorts 12V if you press the power button while one of the limit switches is not engaged. A DC breaker would remedy that, though. I'm sure it could be improved, but like I said, first draft.
That is very sharp. It took me a couple minutes just to figure it out (I didn't catch on to the fact that those were NC end stops at first).
I do need to figure out a way to avoid the short, because it's possible that the circuit could be triggered when the mechanism has slacked somewhat and released from the end stop.