Download the example sketch from our Github repository:

Wiring:

Connect a LED to IOA and IOB as follows:

• Cathode (short leg) of LED connected to the GPIO pin.
  
• Anode (long leg) of LED connected to one end of a resistor*.
  
• Other end of the resistor connected to 5v.
  

* A 1K resistor is shown here as a 'safe' value. For maximum LED brightness, you can learn how to calculate the optimum resistance in this guide: http://learn.adafruit.com/all-about-leds

Compile and upload the example sketch and you should see both LEDs blinking: 1 second on and 1 second off.