The document describes an auto dipper device designed to automatically switch vehicle headlights between low and high beams based on the presence of oncoming traffic. It uses a light-dependent resistor (LDR) as a sensor to detect light levels and operates with a relay to control the headlights efficiently. The device is compact, can be installed in various vehicle types, and is designed to function reliably under diverse environmental conditions.

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

2.  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 .

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

4. L1
1mH
R3
VR1 100K
D1 1N914
+V1
12V AUTO BATTER
S1
ONOFF
+
C1
47uF 12V
RELAY
12V
T1
SL100
T2 2N3055
D2
BY127
L2
12V Lamp
L3
12V Lamp
R1
22k
R2
100k

5. Voltage :
12 Volts
Contact Current :
20 Amps
Device Wattage : 1 watt
Sensitivity range :
(Adjustable from 0.5 lux to
infinity)
Auto dipper can be
used for vehicle with
headlight.
:
Rating upto 250 watts

6.  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.

7.  The animation
opposite shows that
when the torch is
turned on, the
resistance of the LDR
falls, allowing current
to pass through it.

8. 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.

9.  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.

10.  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.

11. 1. It keeps the head
lamps in main beams
if there is no vehicle
from the opposite
direction.

12. 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.

13. 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.

14. 4. It dips the
head lamps of
both the
vehicles if fitted
to both vehicles.
Contd.

15. 5. It
maintains
headlamps in
main beams
on
encountering
dense traffic
from
opposite

16.  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.

17. 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.

18.  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.

19. THANK
YOU