This is a simple traffic light project. It is a very easy project to accomplish and serves as a lesson to learn two basic components in electronics, LEDs, and resistors.

Components required:

D1
D6
2 Red LED
D2
D5
2 Yellow LED
D3
D4
2 Green LED
R1
R2
R3
R4
R5
R6
6 220 Ω Resistor
U1 1 Arduino Uno R3