Purpose

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

2. Current Applications • EMG applications has two key categories • Biofeedback • Communication

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

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

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

6. Electromyography • Recording of Motor Unit Action Potentials (MUAPs) produced by muscle movement • Frequency Range • 50 – 500 Hz • Voltage Range • 0.75 – 2000 uV

7. Electromyography • Underlying Processes • Amplification • Signal-to-Noise Ratio • Common Mode Rejection Ratio • Filtering • Sampling

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

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