Auto-Calibrating Myoelectric Robotic Arm with a Direct Control Algorithm

In this updated video, the arm has been upgraded to a soldered, permanent circuit board for the on-board computer, and a custom printed circuit board for the EMG (electromyographic) amplifiers. In addition, a new software algorithm was added to automatically set gain and threshold settings via a computer-prompted training procedure. This software enhancement dramatically reduces the clinician time required to calibrate the prosthesis. Oak Park River Forest High School (IL) Robotics Club created a working, thought-controlled Myoelectric Arm (wrist rotator and hand open/close). Myoelectric (muscle-generated) voltages can be used to obtain intent of the user via skin-surface electrodes attached to residual muscles above the amputation site. Local nerves driven by thought activate these muscles, where signals are captured and fed to amplifiers, then computer analog to digital inputs. Computer decision algorithms determine intent and activate prosthesis motors accordingly. Myoelectric control is at the heart of modern prosthetics.