Pir Motion Sensor Alarm Circuit Diagram. This simple motion sensor alarm and light circuit is using a passive infrared sensor module also call pir sensor module. Not only that i have an old circuit like this but use the infrared principle.
Pin 1 is vcc which is connected positive 5v supply. The circuit will detect movement of any human animal or an object at a distance of 5 to 10 meters depends on the sensitivity of the pir sensor module and activates a buzzer and an led for a set period of time. Pin1 pin2 and pin3 are corresponded to drain source and ground terminal of the device.
Pir motion sensor alarm circuit automatic wash room light using pir motion detector and automatic light security alarm circuit using pir sensor.
Not only that i have an old circuit like this but use the infrared principle. When any person animal or any object comes in the range of the sensor. Then automatic light switched on. The passive infrared sensor consists of three pins as shown below.
