Download the example sketch from our Github repository:


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

This guide was first published on Mar 28, 2014. It was last updated on Mar 28, 2014.

This page (Running the Example Code) was last updated on Mar 23, 2014.

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