auto dimming of headlight

1. Auto Dimming of Vehicle
Head Light
Vairamuthu J

2. Content
 Introduction
 Troxler Effect
 Prototype Circuit
 Operation Principle
 Circuit Working
 Implementation
 Conclusion

3. Introduction
Night time requirement of head light.
Head lights are controlled manually.
High beam causes Troxler effect.
It leads to dangerous accidents.
This prototype helps in automatic controlling of head light
according to requirements.

4. Troxler Effect
 Toxler- Image glare appear even after the source is
removed.
 Temporary Blindness
 Fading effect
 Around 10,000 lumens, glare is experienced.
 Glare is due to over exposure of cones and rods in our eyes.

5. Before After

6. Prototype Circuit
Components Used
LDR ( Light Dependent Resistor)
Two Resistors
Transistor
Relay Switch
Supply Voltage

8. Operation Principle
Basic operator - Comparator
LDR – Variable Resistor.
LDR & 2 resistor form a potential divider network.
It decides the current in the circuit.
Transistor Gate/Base are triggered
Relay is connected to the transistor

9. Contd…
LED1-high beam bulb
LED2-low beam bulb
Light falls on LDR potential drop occurs between LDR
and R2
Transistors gets conduction mode and relay switch ON.
LED 1 gets turned ON and LED 2 gets turned OFF.
Thus the other vehicle comes closer the intensity get
altered.

11. Circuit Working
Same as like that of the Prototype model.
12 V Dc supply required.
LDR is stimulated by exposed by light by another source.
Voltage drop occurs
Automatically light intensity varies.

12.  Prototyped Car
Ordinary car ->

13. Implementation
Keep away from dust,water,etc.
Supply should be constant
System should be at low beam instantly.
As light falls LDR initiated and headlight back to orginal
form.
Headlight’s is distinct in nature.
Device is highly directional

15. Advanced Prototype
Audi Matrix – LED Headlight
BMW Intelligent Headlight Technology
Mercedes Benz Intelligent LED Light System

16. Conclusion
 Glare gives serious problem for drivers.
 Sudden exposure of light.
 Leads to Troxler effect
 Temporary blindness.
 It is adjusted manually.
 Hence this prototype is more compact
 It gives automatic light dimmer

17. Safe driving
Use
Automatic prototype
Thank you