This is my opensource project for a transhumeral hand prosthesis, WML Bionic Arm. A transhumeral hand prosthesis aims to replace the arm lost above the elbow, so it comes with additional challenges - we must not only control the palm but also an elbow joint. The project is made as cheap and simple to manufacture as possible in order to be affordable. It is based on Arduino Leonardo, uses a combination of Gyroscope, Myoelectric sensors and a couple of DS51150 servomotors.