If you are writing a post or sharing an Arduino project a great way to show your schematic is using scheme-it and it is even easier with the if you have a starting point. One of our Techs here at Digi-Key created a custom Arduino Uno design Starter. Using this starter you have all of the header pins off of your Arduino. Click here to open your own Starter Design.
With this starter you can add your own parts, labels and wires to show how your project is assembled. For more information on using Scheme-it see our Scheme-it section.