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

Topic		Replies	Views
PIR and relay problem Sensors	8	2694	May 6, 2021
PIR sensor problem Sensors	3	657	May 6, 2021
Using PIR to activate relay Programming	7	2648	May 5, 2021
PIR - Relay problem Programming	2	778	May 5, 2021
Relay not activating every time General Electronics	14	9441	May 6, 2021