Street Light Automatic Intensity Controller
In present system, highways are usually lightened up by using HID (High Intensity Lamps) that consumes huge amount of energy and moreover its intensity cannot be varied as per need. Therefore the system “Street light automatic intensity controller” overcomes these limitations by making use of LED’s (Light Emitting Diodes) as light source and simultaneously its intensity can be varied and controlled according to requirements. A microcontroller of 8051 family is used for this purpose that contains programmable instructions to control the intensity by producing pulse width modulated signals which drives a MOSFET to switch LEDs to achieve required results. Thus the intensity increases during peak hours and gradually diminishes in late nights. At sharp 6am it completely goes off and resumes again at 6pm. This procedure goes on repeating everyday like this.