The grating circuit is used to detect the presence of any person or object in a specific area. The detection range of Light Fence Circuit is approximately 1.5 to 3 meters. Using LDR and operational amplifier to design the circuit is quite simple. This portable circuit can be easily operated with a commonly used 9V battery, and the warning sound generated by the buzzer is loud enough to detect people, cars or objects.
Hardware Required:
- Resistor
- Capacitor
- LDR
- IC 555 timer
- PNP Transistor
- Op-amp IC
- Potentiometer
- Buzzer
- Breadboard
Battery
- LED