PIR Motion Detector Circuit

Passive Infra-Red motion sensor is mostly used in security-based designs, and due to their robust operation and low-cost simple security circuits also includes PIR sensor in design. The PIR motion detector circuit is designed with a relay to turn on an electric bulb whenever the PIR sensor detects motion.

 This circuit can be implemented anywhere like a staircase or front gate etc., and when the PIR sensor detects a person’s movement it will trigger Relay and makes an electric bulb glow.

COMPONENTS REQUIRED:

PIR Sensor

5V Relay

Transistor BC547

Diode 1N4007

Resistor 1KΩ

9V battery

Electric Bulb

CONNECTIONS:

Make the connections as shown in the diagram

WORKING:

This PIR sensor has only three terminals and gives a logical output when detecting the motion, Hence it can be used in stand-alone alarms, security circuits, or light automation circuits. The PIR motion detection circuit is constructed with a few easily available components, you can use the Relay breakout board also, The PIR sensor Output pin is connected to the switching transistor BC547 base and the Relay coil is connected to the switching transistor collector terminal another end of the Relay coil is connected to the positive supply, the electric bulb is connected with N/O (Normally Open) terminal when the Relay turn On then common pin makes contact with N/O pin and then bulb starts to glow.

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