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Message: <blockquote data-quote="ArloG" data-source="post: 1164422" data-attributes="member: 418555">I believe it would be better to initiate the threshold trigger and send the pulse down the cable rather than using a linear detector at the trigger wheel. There really is no disadvantage of using a Schmitt device.I did not snap a 'scope screenshot of the output of the interrupter wheel over around 75' of 2 conductor with shield. The shield used as common, or ground in the circuit.To get in the geekery of it all. And hope it makes sense.1) The sensor I have is probably the same that Rima just ordered. 3.3-5 VDC operating voltage.2) The ASC1 provides +5 VDC to power a polorotor servo. And so I used that to power the sensor.3) The SSR input states 3-32 VDC input capability. And that voltage lights its own LED inside.When the sensor is blocked, It provided the pulse down the cable.4) 5 volts at the SSR input triggers the output to conduct. There's your reed switch closure.5) The 'scope waveform, with 5 volts (appx.) vertical excursion gave a bit of a top (trailing edge) slight overshoot at the end of the duration.Adding a trimmer pot in series with the sensor input of the SSR. And adjusting the resistance to lower the waveform voltage a touch above the trigger threshold of 3 volts of the SSR. It's off threshold being (from memory)....2.3 volts? Very nice square wave with just a slight spike on the trailing edge. A box-o-parts of capacitors showed that adding a (again, have to look) 0.01 uf ?? across the input for a snubber.Almost a perfect square wave pulse. And the output looked sweet.The pot was read for resistance and a closest value resistor was chosen.Now. The SSR worked just fine on its own with just the sensor connected to it. I just wanted to look at the waveform. Identified and cleaned the pulse up. That's what geeks do!I know Magic Static make an interface that used an actual relay. Hard contact relays have their uses. SSR's don't suffer low current tarnish over time and contact bounce.</blockquote>

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