Compact emergency lamp using power leds
- 1. COMPACT EMERGENCY LAMP USING POWER LEDS Abstract: Light is essential in the life of human beings. Since 1879, when the first commercial electric lamp was created, men extended their productive time and increased their leisure time after sunset, which collaborated with the development of economy, culture, and scientific knowledge of society. Currently, artificial lighting is present everywhere either in indoor, such as houses, commercial buildings, and industries, or in outdoor environments, such as parks and highways. It provides comfort and security, improves the decoration, and stimulates physical activities. Because of lighting dependence, Emergency lighting system becomes more essential and also it is considered to be a safety item. Existing system: At present the incandescent lamps are being replaced by Compact Fluorescent Lamps (CFL). CFL provide more efficiency over Incandescent bulbs in reducing power consumption. Since energy conservation is needed more we go for the proposed system. Proposed system: In the proposed system, the lighting system is replaced using LEDs made out of semiconductors. This set up can be installed without modifying the existing wiring. The set up consists of a step down transformer and a full wave rectifier circuit. The converted and stepped down DC voltage is applied to the LED array set up. Mean while the DC voltage is also supplied to the battery for storing. The DC level applied is monitored using PIC Microcontroller and if there is no main supply the battery backup is immediately switched to power the LED. Also the LED brightness is adjusted to use it within the level of battery voltage.
- 2. Block Diagram: Power Supply LCD PIC Opto Coupler LED Array 16F877A DPDT Switch Rectifier Battery Micro Socket Supply Controller Hardware requirements: PIC16F877A Microcontroller with Power Supply 12 V Rechargeable Battery LCD DPDT Switch LED Array Rectifier Software requirements Embedded c MPLab Compiler or CCS Compiler Advantages Efficiency of Power Conservation is improved. Pollution Free Lighting System
- 3. Reliable Lighting System.