I have borrowed three different PIR sketches with the same results; the sensor initially is active and fires the 12v relay once, or even several times, but then the sensor becomes inactive and the relay remains on, that is the motor runs continuously. The Arduino is connected to a BC547 transistor/1…

PIR to relay problem

Lavan September 4, 2012, 5:15am 4

Are you driving the relay with the transistor? Please post your schematic.

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