Code 62 AUTO INTENSITY CONTROL OF STREET LIGHTS

Red Light Emitting Diodes (LED) replaces HID lamps in the street lighting systems to include dimming features. A microcontroller of 8051 families is used to control the intensity by developing pulse width modulated signals that drive a MOSFET to switch the LEDs according to achieve the desired operation. In the present system, mostly the lightning up of highways is done through High-Intensity Discharge lamps (HID), whose energy consumption is high. Its intensity cannot be controlled according to the requirement so there is a need to switch on to an alternative method of the lightning system i.e., by using LEDs. This system is built to overcome the present-day drawbacks of HID lamps. This system demonstrates the usage of the LED’s (light-emitting diodes) as the light source and its variable intensity control, according to the requirement. LED consumes less power and its lifetime is more, as compared to the conventional HID lamps. The more important and interesting feature is its intensity can be controlled according to the requirement during non-peak hours which is not feasible in HID lamps. A cluster of LEDs is used to form a street light. The microcontroller contains programmable instructions which control the intensity of lights based on the PWM (Pulse width modulation) signals generated. The intensity of lights is kept high during the peak hours, as the traffic on the roads tends to decrease slowly in the late nights, the intensity also decreases progressively till morning. Finally, it completely shuts down in the morning at 6 and again resumes at 6 pm in the evening. The process is repeated. This concept in the future can be enhanced by integrating it with the solar panel, which converts the solar intensity into a corresponding voltage, and this energy is used to feed up the highway lights.