Introduction
A traffic light is used to signal the vehicles of the road indicating the vehicles to start moving or stopping. A 4-way traffic light controller system can be used to control the flow of traffic on a 4-way intersection. Depending on the amount of traffic, the speed of alternation between red-yellow-green lights can be varied as well.
This system utilizes the NE555 timer to produce a square wave signal. The NE555 timer IC works in an astable multivibrator, so the duty cycle of the square wave can be adjusted according to our needs by rotating a potentiometer. The output of the timer IC is connected to CD-4017-decade counter. The traffic lights are connected to the decade counter output in a sophisticated way. In this tutorial, we are going to discuss the step by step process to make a NE55 timer IC and CD-4017 based 4-way traffic light system.
Required Components
- NE555 Timer IC
- 4017 Decade Counter IC
- Potentiometer
- Resistors
- Diodes
- Capacitors
- LED Lights (Red, Yellow, Green)
- Breadboard or Veroboard (Optional: PCB)
- Connecting wires
- 5V power Supply
Circuit Diagram
Instructions
The hardware setup should be made according to the above diagrams. It is recommended to individually implement 2 different portions of the circuits and check if they are working fine individually. Be sure to check if all the connections are secured if the circuit is implemented on a breadboard.
