Foritun-val

Apart from the basic Arduino, you'll need:

• 1 x 10k-ohm resistor

• 1 x pushbutton switch

• 6 x 220-ohm resistors

• A breadboard

• Connecting wires

• Red, yellow and green LEDs

Almost any Arduino will work for this project, providing it has enough pins. Make sure you read our Arduino buying guide if you are not sure what model you need. You may already have these parts in your Arduino starter kit.

Arduino Traffic Light: The Basics

Let's start small. A basic, single traffic light is a good place to start. Here's the circuit:

Connect the anode (long leg) of each LED to digital pins eight, nine, and ten (via a 220-ohm resistor). Connect the cathodes (short leg) to the Arduino's ground.