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Message: <blockquote data-quote="snoopdan" data-source="post: 7716263" data-attributes="member: 564991">IR optical switches would be fine.  Easy wiring and logic, its either bit 0 or bit 1.  That could be easily used for staging/trap and the logic is easy to write for that because to figure out trap times, its just an algorithm for time/distance.  The light board would be the tricky part, i'd not attempt to make my own lightboard...im sure you could find one that has an RS-232 input so you can just transmit times from the plc logic directly.  Would save a ton of engineering time.DirectLogic has some PLC's for fairly cheap.  Logic is pretty easy for it too though.</blockquote>

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