Automatic Dipper for Vehicles

While driving a car in night a problem like many drivers do not dip the head lamps of their vehicles in night while approaching. The several switching operation is used to dip the head light which may distract the concentration. To overcome this type of problem the innovative group Dreamlover Technology designs a unique electronics gadget called “Automatic Dipper” using very popular IC NE555 and LDR.

Circuit Description

The entire circuit of automatic dipper consist LDR followed by timer IC NE555 (IC1) and few other components, where LDR is used as sensor. LDR sense the light and change its internal resistance according light fall on it, which is further mounted in PVC pipe of 4 cm length positioned on the grill of car or in front such that the light fall on the LDR only when vehicles is approaching and is distance of 3M to 9M. When light fall on it the resistance decrease and makes output of IC1 low which energized the relay. The relay operates and voltage across the head lamps is reduced. When the distance between two approaching vehicles is more than 9 meter or less than 3 meter the circuit is not operated.

circuit diagram of automatic dipper

The operating and non operating distance of the circuit can be varied by proper positioning of the PVC pipe and by adjusting the variable resistor VR1.


Resistors (all ¼-watt, ± 5% Carbon)

R1 = 10 Ω/10W

VR1 = 10 KΩ


IC1 = NE555 (timer IC)

D1 = 1N4001


RL1 = 12V/100 Ω

LDR1= Light dependent resistor

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