Connecting our PIR motion sensor
Commercially available alarm systems connect to their devices using a 4 core or 6 core alarm cable. In the previous chapter, we used a 4 core cable because we were connecting a switch that needed two wires plus an antitamper loop, which needed another two wires.
For our PIR sensor circuit, we need the same four wires; however, we also need to send power to the device from the control panel, so an additional two wires are needed for this—hence the requirement for a 6 core cable.
The following diagram shows the wiring connections for my GardScan PIR sensor, but this is in fact typical for most off-the-shelf security system devices:
Typical connections for security system sensor devices
Similar to the magnetic contact ...
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