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 August 27, 2012, 8:09am 2

What are the voltages you are seeing at base of BC547 when its active and inactive?

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