Automatic Headlight Beam Controller

Automatic Headlight Beam Controller

Aslam Musthafa R, Bala Krishnan T, Seetha Raman N, Shankar M, Swathi R

Aslam Musthafa R, Bala Krishnan T, Seetha Raman N, Shankar M, Swathi R "Automatic Headlight Beam Controller" Published in International Journal of Trend in Research and Development (IJTRD), ISSN: 2394-9333, Special Issue | ETEIAC-17 , March 2017, URL:

Headlight 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 our vehicles to avoid human eye effects. This automatically switched the high beam into low beam, therefore reducing the glare effect by sensing the light intensity value of approaching vehicle and also eliminated the requirement of manual switching by the driver which has not done at all times. The MP lab software was employed to program the microcontroller. 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. It was observed that the maximum spread angle of headlight was 135 degree. At the time the spread light from other sources reached the sensor, its intensity would be very much reduced below the triggering threshold level. The sensitivity of a photo detector determined the relationship between the light falling on the device and the resulting output signal. A server module could be included to this system for receiving and storing headlight rays parameter information in a database application.

LDR, PIC Controller (16f877a), Headlight System

Special Issue | ETEIAC-17 , March 2017


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