Purpose Design a system that will efficiently measure

Purpose Design a system that will efficiently measure signals produced by muscle movement and use these signals to operate a remote control car.

Current Applications l EMG applications has two key categories – Biofeedback – Communication

Current Applications l Biofeedback – Mainly for clinical purposes – Utilized as muscle relaxation and treatment – Also to prevent painful muscle conditions l Communication – Mostly experimental – Muscle movements that control electronic and computer devices

Current Products l Prices ranges from $175 - $2000 l Inexpensive – Have no computer interface – Generally only Useful for muscle training

Electric Activity? l The contractions of all muscles are triggered by electrical impulses called Motor Unit Action Potentials (MUAP’s). l MUAP’s can be created internally or externally by devices such as the pacemaker.

Electromyography l Recording of Motor Unit Action Potentials (MUAPs) produced by muscle movement l Frequency Range – 500 Hz l Voltage Range – 0. 75 – 2000 u. V

Electromyography l Underlying Processes – Amplification • Signal-to-Noise Ratio • Common Mode Rejection Ratio – Filtering – Sampling

Potential Applications l Wheelchair Control – Control the motions of a wheelchair without using the hands – Signals go directly from face to wheelchair interface l On-screen Mouse Control – Move mouse pointer using facial muscles alone

Interface to PC l Digitize Signals Measured with EMG – Analog to Digital Converter – Comparator l Assign Codes for System Control – Determine Number and Degree of Muscle Movements to Execute Commands l Apply Commands on Test System