Multichannel EMG acquisition system for arm and forearm signal detection

The aim of this article is to design a multichannel electromyographic (EMG) signal acquisition system, using the fewest electronic components to avoid noise as much as possible. This is accomplished by means of an electrodes array for differential acquisition and two references to reduce array´s area and noise. It consists of a 16-channel acquisition system connected through a microcontroller USB interface for storage. Each single acquisition channel consists of a buffer, a pre-amplifier and filters; providing a low cost acquisition stage as well as a low noise system and retaining all the information that can be found at a frequency of 50 Hz, due to non-use of a notch filter. Making it possible to measure specific movements of the arm and forearm at the same time.