LED Traffic Light Circuit Project
Learn how to design and build a traffic light using LEDs, resistors, capacitors, timers, and counters. This project emulates a UK traffic light system and is controlled by a potentiometer for adjustable timing. Explore the circuit diagram, components used, and the working principles behind this DIY electronics project.
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Presentation Transcript
L E D Done by : Ms. Afnan Fahad
I Introduction Traffic lights are signaling devices positioned at road intersections, pedestrian crossings and other locations to control competing flows of traffic. ntroduction The objective of this project design and fabricate a printed circuit board that would emulate a traffic light. Light emitting diodes (LEDs) were used for the green, yellow and red lights of the traffic light. The lighting of the LEDs was timed using a combination of a counter IC and a timing IC. The timing and lighting order was set to emulate a UK traffic light, with timing controllable by a potentiometer.
Circuit diagram Circuit diagram
c components omponents Resistors 470 , 22k , 100 k Capacitors 0.1uF , 1uF , 10 uF LEDs Red , Green , Amber Diodes 1N4148 Counter 4017 555 Timer NE555 Potentiometer 1M preset, horizontal Battery 9v
D Description escription To time the traffic light, a 555 timer IC was used to generate pulses in regular configurable intervals . The pulses generated by the 555 timer were fed into a decade counter. A 4017 counter was used in this case to time the three LEDs.
555 555 t timer imer
4017 4017 c counter ounter
l led ed LEDs emit light when an electric current passes through them. LEDs must have a resistor in series to limit the current to a safe value.
a applications pplications Ramp metering. Timers. Fire station or medical emergency entrance. At the entrance and exit of some car washes.
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