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Mind Control of Systems

Mind Control of Systems. Designing a system to measure brain waves in order to obtain commands to control the direction of a remote-control car By Gary Obenski & Jim Bradbury. Primary Goals. Determine an efficient way to obtain brain wave signals from human subject

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Mind Control of Systems

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  1. Mind Control of Systems Designing a system to measure brain waves in order to obtain commands to control the direction of a remote-control car By Gary Obenski & Jim Bradbury

  2. Primary Goals • Determine an efficient way to obtain brain wave signals from human subject • Determine a way to change different wave patterns to commands such as ‘left’ and ‘right’

  3. Electroencephalography • Science of recoding electric currents produced by human brain • Discovered by Hans Berger in late 1920’s

  4. Brain waves • Arise from cerebral cortex • Byproduct of normal brain function • Millions of pyramidal cells produce small currents as the nerve impulses change

  5. Four types of waves Alpha Beta Delta Theta

  6. Similar experiments • Mind control by rats • US Air Force flight simulator

  7. Biofeedback • Alternative method to try to interpret brain wave signals • Trains individual to learn how to produce specific frequencies

  8. Where to go now… • Acquire the means to harness EEG waves (Integration of Amplifier and Filter) • Interpret signal as “1’s” and “0’s” • Condition subject to consistently produce desired signal • Interface EEG waveform to computer software • Change the world!!!

  9. Initial Design • Differential amplifier • Minimum gain of 10,000 • Bandwidth of 0.5 Hz to 50 Hz • Low noise

  10. Options • Buy amplifier • Easier • Cost consideration • Design amplifier • More difficult • More flexible

  11. Amplifiers • Brainmaster circuit • Modified instrumentation amplifier

  12. Brainmaster circuit diagram

  13. Brainmaster circuit specs • Gain : 20,000 • Bandwidth : 1.7 – 34 Hz • Input Impedance : 10 Mohms • CMRR : 100 dB

  14. Instrumentation amplifier circuit diagram

  15. Instrumentation amp frequency response • Gain : 20,000 • Bandwidth : 0.2 Hz - high value (depends on gain-bandwidth product of op-amp)

  16. Test • Compare each circuit • Modify if needed • Decide which one to use • Flexibility • Cost • Performance

  17. Modified Circuit Diagram

  18. Specs • Gain : 20,000 V/V 86 dB • Bandwidth : 1.25 - > 1 kHz • CMRR : 102 dB

  19. Output Signal

  20. Frequency Response

  21. BrainMaster Model: Simulation Schematic

  22. Simulation Results

  23. Output Waveform of First Stage

  24. Output Waveform Second Stage

  25. Frequency Response of BrainMaster Amplifier

  26. Problems with BrainMasterand Solution • Voltage Divider of 10000 would not register any AC Signal • Unable to Couple the Two Stages SOLUTION: Always have an alternative design it case one goes wrong.

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