Design ideas…

Presented by:-DEBASHIS DEYAVIK MUKHERJEEABHIRUP DUTTAABHISHEK NATHFOUZIA NUZHAT ZIA

PRESENT PROJECT PLANS

To implement an Adaptive Lighting System for Automobiles which detects itself whether there is light from any coming vehicle or not.

No manual operation for switching ON/OFF headlight/downlight.

Automatic switching to downlight when light comes from on coming vehicle & automatic return to headlight as it passes by.

Principle:

◦ Light falling on a Light Dependent Resistor, decreases its internal resistance.

◦ This in turn decreases the voltage drop across it.

◦ Output of the LDR is connected to the positive terminals of two parallel comparators whose other terminals are fixed by a voltage divider circuit.

◦ The potential differences created as

a result are taken as comparator outputs from where LEDs are made to glow to represent two different light beams.

Light Sensor

Amplifier Voltage Comparator

Led’sGlow

INDICATION

Case 1:-Enough Ambient light Condition Initially, let us assume there is enough ambient light to

maximize the voltage drop across the LDR. At this time V(LDR) is less than V2 and V1 (V2>V1). Comparators do not conduct and neither of the LEDs glow.

Case 2:-High intensity light coming from opposite

Now, say the ambient light has decreased to a certain amount equivalent to make V2<V(LDR)<V1. The lower comparator triggers and the “low beam” LED glows.

Case 3:-Darkness condition Again, say there is no more ambient light. V(LDR) is

maximum, which is greater than V2 and V1. Both comparators trigger and the “high beam” LED glows.

Components:◦ IC LS-7408 (AND Gate)◦ IC LS-7404 (NOT Gate)◦ IC OP-07 (Voltage

Comparator)◦ LDR◦ LED◦ Potentiometer◦ Resistances

IC LS7408 (AND gate)

IC OP-07 (Voltage comparator)

They allow less power to be used in many different kinds of lights.

They help lights last much longer. They can be trigged by several different kinds of triggers, which is very useful for motion lights and security systems.

They are also very useful in watches and cars so that the lights can turn on automatically when it becomes dark.

Resistance :1.Power dissipation effect.

2.Setling time effect.

Logic gates(NOT,AND):1.Low current rating.

wires:1.Loss connection.

LED:1.Solid state devices such as LEDs are subjected to very limited wear & tear if operated at low currents & at low temperatures.

2.The most common symptom of LED(and diode laser)failure is the gradual lowering of light output & loss of efficiency.

FUTURE PROSPECTS

Provisions for better efficiency of lane driving by means of automatic light beam control at bends.

This can be achieved by measuring the tire rotation and comparing the angle with a preset value.

With each road bend sensed, the headlight under ON condition automatically switches to downlight.

As the road straightens, headlight is automatically switched ON.

IEEE Journals.

Electronics for you.

Open Sources.