Arduino to Raspberry Pi Adapter for Robotic Arm

This is a Raspberry Pi adapter that I designed for the [SainSmart 6-Axis Desktop Robotic Arm](https://www.sainsmart.com/products/6-axis-desktop-robotic-arm-assembled), as it was designed to be used with an Arduino instead. But you should be able to use in plenty of situations, where you are normally supposed to mount an Arduino but you rather want to use a Raspberry Pi.