POWER SAVING LED LIGHT REPLACING CONVENTIONAL LAMPS Submitted By

OVERVIEW Introduction Embedded System Block Diagram AC Supply LED

Introduction A string of LED’s are made to operate at 230V AC. A series capacitor is used to drop the voltage and a resistor is used to limit the current . The voltage is then rectified to DC for maintaining a safe operating voltage for the LEDs. Numbers of LEDs are used to give adequate illumination from ac supply. White LEDs are preferred to be used as they deliver bright light.

EMBEDDED SYSTEMS Definition for :- EMBEDDED SYSTEMS A combination of hardware and software which together form a component of a larger machine. An example of an embedded system is a microprocessor that controls an automobile engine. An embedded system is designed to run on its own without human intervention, and may be required to respond to events in real time.

EMBEDDED SYSTEMS

BLOCK DIAGRAM

AC SUPPLY Alternating Current (AC) flows one way, then the other way, continually reversing direction. An AC voltage is continually changing between positive (+) and negative (-). The rate of changing direction is called the frequency of the AC and it is measured in hertz (Hz) which is the number of forwards-backwards cycles per second.

LED LEDs are semiconductor devices are made out of silicon When current passes through the LED, it emits photons as a byproduct. Normal light bulbs produce light by heating a metal filament until its white hot LEDs present many advantages over traditional light sources including lower energy consumption, longer lifetime, improved robustness, smaller size and faster switching

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