Hello,<p>Thank you (everyone) for the ideas. The shaft is not a motor. I just need to detect when it is still or turning backwards. I am now thinking of something mechanical to do the switching. I need something simple, and perhaps I was thinking too much. <p>Thanks,
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I need to create a circuit that will trigger a relay when a shaft stops turning. My thought was a small electric motor connected to the shaft acting as a electric generator, and a circuit to measure the tiny amount of current generated by the motor. when the current = (or very near) 0, the relay wil...