White Light Emitting Diodes
(LED) replaces HID lamps in street lighting system to include dimming feature.
A microcontroller of 8051 family is used to control the intensity by developing
pulse width modulated signals that drives a MOSFET to switch the LEDs according
to achieve 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 lightning system i.e., by using LEDs. This system is build 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’s consume less power and
its life time 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 are used to form a street light. The microcontroller contains
programmable instructions which controls the intensity of lights based on the
PWM (Pulse width modulation) signals generated.
The intensity of lights are
kept high during the peak hours, as the traffic on the roads tend to decrease
slowly in the late nights, the intensity also decreases progressively
till morning. Final it completely shuts down at morning 6, and again resumes at
6pm in the evening. The process is repeated. This concept in future can be
enhanced by integrating it with the solar panel, which converts the solar
intensity into corresponding voltage, and this energy is used to feed up the
highway lights.
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