- Dec 7, 2010
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).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.
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.