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Group N3: Digital Control

Group N3: Digital Control. Mary Nsunwara Wayne Blake Reshun Gethers. Current Design Issues. EMG Circuit Will previous design work Signal Source & Usage Which muscles to monitor A/D Converter & Software Need PCI connection. Current EMG Circuit. Specifications. Gain: 20,000

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Group N3: Digital Control

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  1. Group N3: Digital Control Mary Nsunwara Wayne Blake Reshun Gethers

  2. Current Design Issues • EMG Circuit • Will previous design work • Signal Source & Usage • Which muscles to monitor • A/D Converter & Software • Need PCI connection

  3. Current EMG Circuit

  4. Specifications • Gain: 20,000 • Bandwidth: 1.7 - 34 Hz • Input Impedance: 10 M • CMRR: 100dB

  5. Other EMG Considerations MindTelTNG-3B

  6. MindTel TNG-3B • Is an actual electromyogram • Has serial port connection • Data rate: 19.2 kbps • Cost: $150

  7. TNG-3B Software • Managed by NeatTools Software • Utilizes flow chart diagrams • No hard coding required

  8. Current A/D Converter • Keithley DAS-1701ST-DA • Max sampling rate: 160 kb/s • Input ranges: 0 - 5V, 1V, 100mV, 20mV • Gains: 1, 5, 50, 250 • Uses DriverLINX Package Software • Does not have a PCI connection

  9. Signal Source Options • Eyebrows • Good contraction speed • Difficult to move one eyebrow • Low fat tissue coverage • Jaw muscles • Better contraction speed • Easier to bite on one side of mouth • Usually covered by more fat tissue

  10. Current Design Goals • Front End • Build and test current EMG circuit • Acquire a transferable A/D converter • Back End • Determine best way to signal the RC device

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