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Presented By:
Mahesh Kr. Gupta
E.C.(Sem 7th )
Roll no. 0501031048
U.C.E.R Naini Alld.

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

12V
RELAY
R1
22k
L1
1mH
12V Lamp
12V Lamp
L3
L2
D2
BY127
R2
100k
ON\OFF
D1 1N914
T1
SL100
S1
T2 2N3055
+
+
V1
R3
VR1 100K
C1
47uF 12V
12V AUTO BATTER
Voltage
:
Contact Current
:
Device Wattage
:
Sensitivity range
:
12 Volts
20 Amps
1 watt
(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
illuminated with light resistance
drops dramatically.
Working Of LDR

The animation opposite
shows that when the
torch is turned on, the
resistance of the LDR
falls, allowing current to
pass through it.
Example of a light sensor circuit :
When the light 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 light.
However, when light shines onto the LDR
its resistance falls and current flows into the
base of the first 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
sensitive.

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.
Contd.
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 if fitted to
both vehicles.
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 it
receives the light of the approaching vehicle in proper position. Sensor
position can be adjusted slightly by bending the sensor support. The
device gets activated only when headlights are in "on" position.
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 function is automatic control of headlamps
beam
This Intelligent device (AUTODIP) automatically
understands the well Lit and Dark roads and
functions accordingly and promptly
Understands the type of roads including curves and
straight
Understands approaching traffic’s DIP and MAIN
beams
Device also understands the dipper switch position
The head lamp ON/OFF status It is designed to
withstand: Vibrating environment, Bumpy roads,
sudden temperature variations, 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