Group N3: Digital ControlGroup N3: Digital Control

Mary Nsunwara

Wayne Blake

Reshun Gethers

Current Design IssuesCurrent Design Issues

EMG Circuit–Will previous design work

Signal Source & Usage –Which muscles to monitor

A/D Converter & Software– Need PCI connection

Current EMG CircuitCurrent EMG Circuit

SpecificationsSpecifications

Gain: 20,000Gain: 20,000Bandwidth: 1.7 - 34 HzBandwidth: 1.7 - 34 Hz Input Impedance: 10 MInput Impedance: 10 M CMRR: 100dBCMRR: 100dB

Other EMG ConsiderationsOther EMG Considerations

MindTel TNG-3B

MindTel TNG-3BMindTel TNG-3B

Is an actual electromyogramHas serial port connectionData rate: 19.2 kbpsCost: $150

TNG-3B SoftwareTNG-3B Software

Managed by NeatTools Software– Utilizes flow chart diagrams– No hard coding required

Current A/D ConverterCurrent 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

Signal Source OptionsSignal 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

Current Design GoalsCurrent Design Goals

Front End– Build and test current EMG circuit

– Acquire a transferable A/D converterBack End– Determine best way to signal the RC

device