PCB # 140009-1 for the Arduino Extension Shield, as described in Elektor Magazine, edition July & August 2014.
This shield intended to augment the Arduino Uno offers starters a text display, LEDs and pushbuttons to provide a good basis for their projects. For experienced users two extension connectors are provided which can be used to connect relay modules, wireless modules and many other devices. This shield thus ameliorates the Arduino Uno's most significant shortcomings on on-board peripherals.
For more information, please visit www.elektor-magazine.com/140009.