Discuss PIR sensor problem in the UK Electrical Forum area at ElectriciansForums.net
The sensor in a PIR or motion detector is actually split in two. The reason for that is it is looking to detect motion change and not average IR levels. The two halves are wired up so that they cancel each other out. If one half sees more or less IR radiation than the other, the output will swing high or low depending on the type of PIR. If your sensor is normally closed switch then when the sensor is triggered it will open the circuit cutting the supply of power to the load and vice versa. Check the sensors specification and or setting.
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