1. Data Acquisition for Biofeedback System Using LabVIEW Midterm Presentation Performed by Rapoport Alexandra Supervised by Eugene Rivkin 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, pulse, etc.  The response of the system is given by visual presentation.

3. System Structure LabVIEW interpretation PCI 6035E 4x16 bit 4 channels (of 12) Temperature to Voltage Resistance to Voltage Two parts isolated

4. Temperature Detectors  Temperature detectors – one for each side.  Two terminal IC temperature transducer AD590  Voltage source (to be defined)  Digitally controlled programmable-gain instrumentation amplifier PGA202.  Low pass filter

5. Temperature Sensor Circuit

6. Impedance Sensor  Electrode  3-terminal adjustable current source LM334  Clock oscillator (generates pulses with 20% duty cycle).  Transistor  Digitally controlled programmable-gain instrumentation amplifier PGA202.  Voltage source  Low Pass filter

7. Impedance Sensor Circuit

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 Amplifier controls

10. Software Specifications  LabVIEW6 based interpretation  Two interfaces:  Patient interface  Examiner interface  Calibration and range settings available

11. Time Schedule Project definition Project definition Starting with LabVIEW Starting with LabVIEW General circuit definition General circuit definition Starting with physiologic issues (internet search) Starting with physiologic issues (internet search)  Circuit parameters definition  Circuit implementation  Physiological parameters definition  Software implementation  Software testing  Hardware testing  Integration