In this tutorial, we take a look at working with LEDs to make a simple circuit on a breadboard. In Part 1, we light up a single LED, and in Part 2, we setup a more advanced “Stop Light” configuration, as well as write a python script that makes the LEDs blink.
Cobbler for RPi1 (26 pins) – http://www.adafruit.com/products/914
Cobbler for RPi2/B+ (40 pins) – http://www.adafruit.com/products/2029
Circuit Layout: http://techerudio.com/tutorials/13/LED-Circuit-Diag.jpg