Arduino LED Traffic Light
For this project, you will need:3 x LEDs (Recommended colors: green, yellow, red)3 x 220-ohm resistor1 x Arduino UNO1 x USB Cable1 x Breadboard Setting Up the LED's You can now position the components however you like. Just remember that each LED has two leads - a shorter one and a longer one. Th...By: Aleksandar Tsvetkov
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[original story: Instructables]