Presented By: Nishant Sinha EX (Sem 7th ) enroll no. 0853EX101040

Auto Dipper is highly sophisticated electronic device that switches head lights of an automobile/vehicle to differ mode(low beam) automatically when the sharp light beam lights off an on coming vehicle falls on its windscreen . And it switches back from dipper mode (low beam) to main beam (high beam) automatically once the on coming vehicle passes off . This happens within a fraction of seconds .

Relay Printed circuit board Optical sensor(LDR) Resistors Diodes Capacitors Transistor Lamp Switch

L11mH

R3VR1 100K

D1 1N914

+V1

12V AUTO BATTER

S1

ON\OFF

+

C147uF 12V

RELAY12V

T1SL100

T2 2N3055

D2BY127

L2

12V Lamp

L3

12V LampR122k

R2100k

Voltage : 12 Volts

Contact Current : 20 Amps

Device Wattage : 1 watt

Sensit ivity range :(Adjustable from 0.5 lux to

infinity)

Auto dipper can be used for vehicle with

headlight. : Rating upto 250 watts

Relay : 12Volts , 300mA Coil

LDRs or Light Dependent Resistors are very useful especially in light/dark sensor circuits. Normally the resistance of an LDR is very high, sometimes as high as 1000 000 ohms, but when they are il luminated with light resistance drops dramatically.

The animation

opposite shows that

when the torch is

turned on, the

resistance of the LDR

falls, allowing current

to pass through it .

When the l ight level is low the resistance of the LDR is high. This prevents current from flowing to the base of the transistors. Consequently the LED does not l ight.However, when light shines onto the LDR its resistance falls and current f lows into the base of the f irst transistor and then the second transistor. The LED lights. The preset resistor can be turned up or down to increase or decrease resistance, in this way it can make the circuit more or less sensit ive.

A relay is an electrical switch that opens and closes under the control of another electrical circuit. In the original form, the switch is operated by an electromagnet to open or close one or many sets of contacts. It was invented by Joseph Henry in 1835. Because a relay is able to control an output circuit of higher power than the input circuit, it can be considered, in a broad sense, to be a form of an electrical amplifier.

When a current flows through the coil, the resulting magnetic field attracts an armature that is mechanically linked to a moving contact. The movement either makes or breaks a connection with a fixed contact. When the current to the coil is switched off, the armature is returned by a force approximately half as strong as the magnetic force to its relaxed position. Usually this is a spring, but gravity is also used commonly in industrial motor starters. Most relays are manufactured to operate quickly. In a low voltage application, this is to reduce noise. In a high voltage or high current application, this is to reduce arcing.

1. It keeps the head

lamps in main beams

if there is no vehicle

from the opposite

direction.

2. It dips the head lamps automatically on encountering another vehicle from the opposite direction and restores main beam at crossing points if the opposite driver also dips his head lamps.

Contd.

3. It restores the main beam much before crossing if the oppostite driver does not dip his head lamps within the safe stopping sight distance of 100 meters.

Contd.

4. It dips the

head lamps of

both the

vehicles i f f i t ted

to both vehicles.

Contd.

5. It maintains headlamps in main beams on encountering dense traffic from opposite direction on a dark road.

The size of the device is about 2.5 inches cube . Auto dipper box can be installed anywhere near steering as per convenience so that "ON-OFF" switch on auto dipper box can be used easily. Sensor Eye is mounted near wiser position near the top edge of wind screen (inside the car) such that i t receives the l ight of the approaching vehicle in proper position. Sensor posit ion can be adjusted slightly by bending the sensor support. The device gets activated only when headlights are in "on" posit ion.

For truck & buses, Sensor Eye can be placed on lower side of wind shield inside close to the right hand of driver and for car and jeep etc. the Sensor Eye can be placed using the Sun wiser support screws.

The device can be operated with the existing 12 volts battery of the vehicle.

Salient Features:

Main funct ion is automatic control of headlamps beam

This Intel l igent device (AUTODIP) automatical ly understands the well Lit and Dark roads and functions accordingly and promptly

Understands the type of roads including curves and straight

Understands approaching traff ic’s DIP and MAIN beams

Device also understands the dipper switch posit ion

The head lamp ON/OFF status It is designed to withstand: Vibrating environment, Bumpy roads, sudden temperature variat ions, Salty and chemical environment, etc.

AUTODIP is a very compact small size device and can easily be mounted and fitted easily anywhere inside in any automobile / vehicle or under the bonnet and sensor is concealed and mounted behind the windscreen by an auto electrician or by company-trained personnel. The entire process has only two steps physical installation and electrical integration. The whole process takes only 5 to 10 minutes.

THANK

YOU