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ldr sensor circuit

Dark sensor circuit

LDR darkness circuit diagram 

Darkness circuit using the comparator 

This circuit uses directly 220v AC.  so careful when testing

ldr sensor circuit

Note- LDR must keep away from the light of the load bulb for flicker less operation. You can do this using the covering of the side area of LDR using black tape.

Components

Resistors

10K-1

220Ω-1

510Ω or 470Ω -1

56K-1

Capacitors

 100uf 25v-1

220nf (224)-1

220uf 25v-1

Variable resistor 22K-1

Diode

1N4007-4 

Transformer

0-6v 500ma- 1

IC

LM358 (comparator)-1

MOC3021 (optocoupler- 1

Transistor BC548-1

Triac BT138-1

LDR (12mm)-1

 

Download Gerber.dark sensor.zip

Download PCB layout 

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