Light Fence circuit

Last Updated on March 16, 2024

Simple Light Fence circuit and this circuit can be used for security purpose, by implementing light fence at the entrance gate or entry door we can get notified before the person knock the door. Use white LED biased with 220Ω  3Volt battery for light source.

Light Fence

Components List

S.No Name Quantity
1. IC 4069 1
2. LDR medium size 1
3. Relay 9Volt 1
4. Light source (white LED) as required
5. Transistor 2N4401 1
6. Resistor 100KΩ
Resistor 10KΩ
Capacitor 1 uF/20V
Capacitor 100nF
Diode 1N4004

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