Traffic light simulation

Design a circuit to simulate traffic lights. Use as output one red, one yellow and one green LED.

The LEDs should light up according to the following:

  • The green LED should turn ON for 5 seconds.
  • Consecutively, the yellow LED should turn ON for 1 second.
  • Finally, the red LED should turn on for 3 seconds.
Submit your sketch as an .ino file and -optionally- a circuit schematic.