Highlights Powered by the alarms PIR No contact with the PIRs actual sense circuits, so no interruptions to the alarm functionality Replicates where I initially used an expensive Z-Wave Fibaro Universal Binary Sensor FGBS-001 / FGBS-321 I initially set out to replace the Z-Wave unit with a similar setup. I placed an optocoupler in series with the trip circuit and calculated the various resistances etc to replace one of the standard End Of Line / Tamper resistors. This worked, but I always felt a little funny about modifying a core security…
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