In this tutorial we will making a traffic lights that will change from green to red via amber, after a set of time using the 4 state system. This project could be used on model railway, model road or model car, make a set of working traffic light for your DIY scaled town or building a road.


Electronic parts required.

  • 3x LED ( Red, Green, Yellow)
  • 3x 220 Ohms Resistor
  • Jumper Wires
  • Solder-less Breadboard

 Wiring the LED to Arduino

As you can see below we have to connect 3 LED’s with the Anode of each one going to digital Pings 8,9 and 10, via a 220 Ohms resistor on each LED. Jumper wires a place from ground to the ground rail at the top of the breadboard and a ground wire goes from the cathode led of each LED going to the common ground rail.


Sketch Code



Making a LED Traffic Light with Arduino
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