traffic light project Circuit Using 555 Timer IC | 555 IC Project


Hey guys, welcome back to Techatronic. Did you ever think of making a traffic signal light? If yes then this article is for you in which we are going to teach you that how you can make a traffic light project using a 555 timer ic and a 4017 ic. You can also check more articles on Arduino and IoT.

traffic light project


  • First, complete the circuit and then connect the battery to the circuit.
  • You can see that the white LED connected to the 555 ic starts flashing and then red, yellow, and green LEDs also start glowing in such a way that if red is on yellow and green are off and vice versa.
555 timer traffic light
  • You can also adjust the speed of operation of the circuit using the potentiometer.
  • This circuit will automatically turn signal lights on and off in the correct order.
  • You can also check the LED fade in and out circuit using 555 ic made by us.

traffic light project Components Required

traffic light project components
  • 555 timer ic
  • 4017 ic
  • 2 x 100 uF capacitors
  • Resistors 220 ohm, 10K
  • 100K potentiometer
  • Connecting wires and a breadboard
  • Red, yellow, green, and white LEDs
  • 9 volts battery
  • Zener diodes

circuit Diagram for traffic light project

traffic signal

First of all, let’s see the connections for the 555 timer ic.

  • Connect pin 1 of the ic with the negative rail of the breadboard.
  • Join pins 4 and 8 with each other and then join pin 8 with the positive rail of the breadboard.
  • Take a 100 uF capacitor and connect its positive leg with pin 2 of the ic and the negative leg with the negative rail.
  • Join pins 2 and 6 with each other.
  • Place a 10K resistor between pin 7 and the positive rail.
  • Now connect one leg of the 100K potentiometer with pin 7 and the other leg with pin 2.
  • Connect pin 3 of the 555 ic with pin 14 (clock) of the 4017 ic.
  • To the output pin of the 555 timer ic connect an LED as shown in the diagram.

Now, let’s view the connections for the 4017 ic.

  • Join pins 15, 8, and 13 to the negative rail of the breadboard.
  • Attach the positive leg of the 100 uF capacitor to pin 16 and the negative leg to the negative rail.
  • Then make the connections for the LEDs.
  • First, take a red color LED and connect its negative leg with the negative rail via a 220 ohms resistor.
  • Connect its positive leg with pins 3, 2, 4, and 7 of the ic using Zener diodes.
  • Then take a yellow color LED and connect its negative leg with the negative rail via a 220 ohms resistor.
  • Join its positive leg with pins 10 and 11 using Zener diodes as shown.
  • At last, take a green color LED and connect its negative leg with the negative rail via a 220 ohms resistor.
  • Join its positive leg with pins 1, 5, 6, and 9 using Zener diodes.
  • Just make sure that you make all the connections right before testing it.

Lets Test the traffic light Circuit

traffic light project
traffic light project

We hope that you liked the traffic signal light circuit and now try to make it on your own. If you have any doubts related to this post then feel free to use the comments section given below. Also, do check out more tutorials on Arduino and Raspberry Pi.

Thanks for reading.

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