Uploaded December 2021 | Updated September 2026, 1 week ago

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Motion sensing automatic light ON OFF controller using PIR sensor and relay. This is a automatic light controller which turns on light bulb by sensing any human movement. This motion sensor light can be used as a night light, pathway light, stair case light, bathroom light in home and public places like office, hotels, restaurants, school, colleges, hostels etc. By automatically turning ON and OFF of lights by detection human presence the electrical power consumption can saved and electricity bill can be reduced. Also the life time of light bulbs also will increase. This project uses PIR sensor and relay and works without Arduino or any microcontroller. ON time delay of light and sensitivity of motion sensor can be adjusted using a variable resistor according to our need.

Hardware Components Used:
1) PIR sensor -1
2) 5V Relay module 1Channel -1
3) 6V-0-6V 500mA Transformer -1
4) 7805 Regulator IC -1
5) BC547 Transistor -1
6) 1K Resistor -1
7) 1000uF Capacitor -1
8) 1N4007 Diode -2