AUTOMATIC ROOM LIGHT SCHEMATIC DIAGRAM
This circuit uses two LDR sensors put separately with 0.5m distance. Make sure to shut the LDR sensor tightly, in order not to be influenced by the light from outside. The output for this circuit is a 220V AC bulb lamp.
Components :
Diode D1-D4 : 1N4001
Diode D5-D8 : 1N4007
Diode D9-D10 : 1N4148
Resistor R1,R3 : 33k ohm
Resistor R2,R4-R8,R10-R13,R15 : 10k ohm
Resistor R9 : 100 ohm
Resistor R14 : 470 ohm
Resistor variable VR1 : 100k ohm
Capacitor C3-C4 : 0.01 uF
Polar capacitor C7,C9 : 1 uF/25 V
Capacitor C8,C10 : 0.1 uF
IC1-IC2 : NE555
IC3-IC4 : CD4017
IC5 : 74LS04
IC6 : 74LS08
Transistor T1-T4 : BC148
Transistor T5 : SL100
Sensor LDR1-LDR2 : LDR
Switch S1 : Push button
Switch S2 : SPDT switch
Relay R7 : 9V 200 ohm
9V power supply
Polar capacitor C1-C2, C5-C6, C11-C12 : 4.7 uF/25 V
