SEMINAR PRESENTATION

ONHEADLIGHT DIMMER

PRESENTED BY ROHIT SHRIVASTAVA

1212221086

ABSTRACT

Drivers mostly use high beam during night which causes discomfort to people coming from opposite direction

Glare for short timeGlare causes temporary blindness resulting in

road accidents

TROXLER EFFECT

1. Temporary blindness2. 1000 Lumens = Glare3. Even after source of light is

removed, an after image persists for some time creating a BLIND SPOT.

4. Reaction time increases by 1.4 sec.

BEAMS OF HEADLIGHT

Low Beam: 700 Lumens, 135°High Beam:1200 Lumens,15°

COMPONENTS OF CIRCUIT1. LDR(Light Dependent Resistor)2. Two Resistances to be used as Potential

Divider3. Transistor(BJT) or MOSFET(for quick

switching)4. Relay Switch5. LEDs (to simulate Headlights)6. Supply Voltage

COMPONENT RATING1. LDR: As intensity of light falling

increases, resistance of LDR decreases

2. Resistances: 0.25W; 1.6kΩ,30Ω3. BJT/MOSFET: BC 547/IRF 8404. Relay: 400Ω coil, 12V, 5 Terminal

Type5. Supply: 12V from vehicle’s battery box6. LED bulbs: 0.25W for simulating

headlights

CIRCUIT DIAGRAM

RELAY WORKING

THE IMPLEMENTATION

It should be kept at a safe place, protecting from external environment like rain, and dust.

The placement of this circuit should be in line with the eye of the driver, so that it responds exactly in the same way how a driver would react to the bright light.

It should be compact and easy to install.

POSITIONING OF CIRCUIT

ADVANCED APPROACH

REFERENCES

[1] C.Susana Martinez, S.L.Macknik and D.H.Hubel, 1st Edition, Thomas publications, “The role of fixational eye movements in visual perception”[2] Ryota Kanai, Yukiyasu Kamitani and UniversiteitUtrecht, 3rd Edition, Zchingz Publications, “Time-locked perceptual fading Induced by visual Transients”[3] S.Aishwarya, Bright Headlights a major cause ofaccidents, The Hindu, Online edition, May 02,2006.[4] C.Guttman, High intensity headlights could cause roadaccidents by dazzling oncoming drivers, Eurotimes,April 2003. [5] http://seminarprojects.com/Thread-automatic-headlight-full-report