Absence of an upper limb leads to severe impairments in everyday life, which can further influence the social and mental state. For these reasons, early developments in cosmetic and body-driven prostheses date some centuries ago, and they have been evolving ever since. Following the end of World War II, rapid developments in technology resulted in powered myoelectric hand prosthetics. A design of prosthetic arm based on myoelectric was created. The design incorporates movement of arm in flexion and extension. The signal was acquired from biceps above the elbow joint using Ag-AgCl electrode. The proposed design contains signal conditioning circuit, microcontroller, motor drivers, and motor as part of the major components to control arm movement. Control algorithm by using a microcontroller is presented.