AMRITA SAI INSTITUTE OF SCIENCE & TECHNOLEGY
DEPARTMENT OF MECHANICAL ENGINEERING
AUTOMATIC LIGHT SENSOR CONTROL SYSTEM
PREPARED BY :
* AKRAM SYED
* ANVESH REDDY V
*DASTAGIRI SHAIK
* PRASANTH
* SANDEEP MOTURI
UNDER GUIDENCE:
MRS.MANASA
(M.TECH)ASSTPROF
ABSTRACT
Headlights of vehicles pose a great danger during night driving. The
drivers of most vehicles use high, bright beam while driving at night.
This causes a discomfort to the person travelling from the opposite
direction and therefore experiences a sudden glare for a short period
of time.This is caused due to the high intense headlight beam from the
other vehicle coming towards the one from the opposite direction. In
this project, an automatic headlight dimmer which uses a Light
Dependent Resistor (LDR) sensor has been designed to dim the
headlight of on-coming vehicles to avoid human eye effects. The
system device was able to automatically switch the headlight to low
beam when it sensed a vehicle approaching from the opposite side
using LDR sensor.
LITERATURE
• Victor Nutt, Shubhalaxmi Kher proposed this project.
Headlight intensity provides better visual acuity, it inversely
affects oncoming traffic. This problem is compounded when
both drivers are using a higher headlight intensity setting.
• Vithalkar Akshay Ganesh, Khavare Vinayak
Vittal,Maitshaphrang Syiemlieh The system is advantageous
over conventional front lighting system as it saves battery
drainage and also automatically controls the beam switching,
reducing the drivers’ efforts.
• Okrah S.K, Williams E.A, Kumssah. Fdescribes about, An
automatic headlight dimmer which uses a Light Dependent
Resistor (LDR) sensor has been
INTRODUCTION
Automatic headlight project is best project for travels and
transportation vehicles, this project on head light automatic on
during night and off with morning. This project work on LDR
sensor so this project circuit on and off according to light and
dark, this project on LDR sensor on dark effect create by hend
palm or room light off then headlight automatic on and while
LDR sensor on pass any light then headlight automatically off.
This project technology is use many types of outdoor lighting
automatic operating like road light, bungalow, play ground,
garden light etc.
SENSORS DIAGRAM
LDR sensors
Photoresistors, also known as light dependent resistors (LDR),
are light sensitive devices most often used to indicate the
presence or absence of light, or to measure the light intensity. In
the dark, their resistance is very high, sometimes up to 1 MΩ, but
when the LDR sensor is exposed to light, the resistance drops
dramatically, even down to a few ohms, depending on the light
intensity. LDRs have a sensitivity that varies with the wavelength
of the light applied and are nonlinear devices. They are used in
many applications, but this light sensing function is often
performed by other devices such as photodiodes and
phototransistors. Some countries have banned LDRs made of lead
or cadmium over environmental safety concerns.
OBJECTIVE
• Photoresistors are lower in cost, bi-directional and offer
moderate response time.
• LDR (i.e. photoresistor) based light sensors are available in
different shapes and sizes.
• Light sensors need small voltage and power for its operation.
• There is no union potential.
• High light-dark resistance ratio.
APPLICATIONS
• It automatically switches ON lights when the sunlight goes
below the visible region of our eyes. (e.g in evening after
Sunset).
• It automatically switches OFF lights when Sunlight fall on it (
i.e on LDR ) e.g in morning, by using a sensor called LDR
(Light Dependent Resistor) which senses the light just like our
eyes..
THANK YOU