Pir Sensor Circuit Diagram. Pir sensor has 2 preset one is adjustment of sensitivity of its and second is the adjustment of time delay which remain high at output for a duration. Pir or passive infra red sensor is a pyroelectric ir sensor which generates energy when exposed to heat.
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In the presence of a human ir radiation the sensor detects the radiations and instantly converts it into minute electrical pulses enough to trigger the transistor into conduction making its collector go low. Open a new sketch file by clicking new. The passive infrared sensor consists of three pins as shown below.
The 12v dc supply required for the whole circuit can be fed from any standard 12v ac mains adaptor battery.
Pin1 pin2 and pin3 are corresponded to drain source and ground terminal of the device. This pin will be. A practical implementation of the explained pin out details can be witnessed here. Coding in the arduino language will control your circuit.
