1. Data Acquisition for Biofeedback System Using LabVIEW Final Presentation Performed by Rapoport Alexandra Supervised by Eugene Rivkin Eli Shoshan Technion Department of Electrical Engineering The High Speed Digital Systems Laboratory Spring 2003

2. General Concepts of Biofeedback  Used for training of self control.  The emotional state of a person is determined according to physiological parameters such as skin resistance, skin temperature, EEG, heart rate, etc.  The response of the system is usually given by sound or visual presentation.

3. System Structure LabVIEW interpretation PCI 6035E 4x16 bit 4 channels Temperature to Voltage Resistance to Voltage Two parts isolated AC control Clock settings

4. Temperature Detectors  Temperature detectors – one for each side.  Two terminal IC temperature transducer AD590  Voltage sources (5V batteries)  Low pass filter MAX291 – one for each side  Analog isolation amplifier HCPL7850  Resistance  Capacitors

5. Temperature Sensor Circuit 30kOhm

6. Impedance Sensor  Electrode  3-terminal adjustable current source LM334  Voltage source (5V batteries)  Low Pass filter MAX291  Analog switches MAX4654  Analog isolation amplifier HCPL7850  Capacitors

7. Impedance Sensor Circuit 20kohm

8. A/D Specifications  A/D card used: LabVIEW card PCI 6035E  12 channels (4 channels used)  16 bit each  Voltage limits: -10..10V

9. General System Scheme A/D PCI 6035E +LabVIEWsoftware Signal Pull down (unused 6035E inputs) Signal Temperature Sensors Impedance Sensors AC controls

10. Hardware Implementation Circuits were not wied, but the full schematic drawing was made.Circuits were not wied, but the full schematic drawing was made.

11. Physiological Ranges Overall range: 50..2000kOhmOverall range: 50..2000kOhm Relaxation: 800..2000kOhmRelaxation: 800..2000kOhm Mild stress: 300..800kOhmMild stress: 300..800kOhm Severe stress: 50..300kOhmSevere stress: 50..300kOhm Overall range: 26..36ºC Relaxation: 34..36ºC Mild stress: 30..34ºC Severe stress: 26..30ºC Skin ResistanceTemperature

12. Voltage Measurement Ranges Overall ranges:Overall ranges: 0.17..8.45V (for 25 0.17..8.45V (for 25 º C room temperature) Phasic voltage range: 16.9..84.5mVPhasic voltage range: 16.9..84.5mV Overall range: 8.916..9.486V Skin ResistanceTemperature

13. Software Specifications LabVIEW6 based interpretation LabVIEW6 based interpretation Two interfaces: Two interfaces:  Patient interface  Examiner interface Range settings available Range settings available

14. User ’ s Interface Measurement setupMeasurement setup Graphical representationGraphical representation Qualitative state evaluation for trained personQualitative state evaluation for trained person

15. Settings RangesRanges Sampling frequencySampling frequency Time resolutionTime resolution Environment variables (room temperature)Environment variables (room temperature)

16. Settings Window Screenshot

17. Research Window Screenshot

18. Training Mode Screenshot

19. Signal Simulation Three sine waves with random parameters according to measurement mode (temperature or resistance)Three sine waves with random parameters according to measurement mode (temperature or resistance)

20. Conclusions Software part of the project has been implementedSoftware part of the project has been implemented Hardware part of the project has not been wired up, but the full schematic drawing was made.Hardware part of the project has not been wired up, but the full schematic drawing was made. For signal simulation voltage generator has been implemented in LabVIEW 7.0 environmentFor signal simulation voltage generator has been implemented in LabVIEW 7.0 environment