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Technion-Israel Institute of Technology Electrical Engineering Department

Technion-Israel Institute of Technology Electrical Engineering Department High Speed Digital Systems Laboratory. Project subject: wireless biofeedback system. Performed by: Yarovoy Boris 319445722 Krassowizki Alexander 313988859 Instructor: Sinyuk Konstantin.

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Technion-Israel Institute of Technology Electrical Engineering Department

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  1. Technion-Israel Institute of Technology Electrical Engineering Department High Speed Digital Systems Laboratory Project subject: wireless biofeedback system Performed by: Yarovoy Boris 319445722 Krassowizki Alexander 313988859 Instructor: Sinyuk Konstantin

  2. Project objective Building of Biofeedback systemwhich collects data from a person and creates influence on it accordingly, minimizing user interface

  3. System description PIC Microcontroller I2C Temperature sensor Skin resistance circuit A/D UART Control PWM Influence PC

  4. System components • Digital temperature sensor of TI TMP100 with I2C interface • Skin resistance circuit (self built) • Microchip microcontroller PIC18f452 with I2C interface • Sound and light sources • Computer

  5. System components • PIC microcontroller PIC MSSP used as I2C interface MPLAB2 module for debugging C-compiler Evaluation board with LED’s 5 I/O ports PWM module UART module MSSP module

  6. Components description • Temperature sensor The TMP100 require no external components for operation except for pull-up resistors (10 kOhm) on SCL, SDA (I2C interface pins), although a 0.1uF bypass capacitor is recommended.

  7. Vdd Temperature sensor . 0.1uF 4 ADD1 (Input) TMP 100 SCL 1 3 To I2C controller ADD0 (Input) 6 5 SDA 2 NOTE: SCL and SDA require pull-up resistors for I2C bus applications. GND

  8. Connecting T sensor to PIC PIC T sensor SDA I/O port C with I2C pins A/D Temperature register SCL SDA: digital temperature data SCL: serial clock TMP100 resolution : 9-12 bits (up to 0.0625 C) with conversion rate 25-3 samples/s

  9. Components description • Skin Resistance Circuit • Current up to 15 uA flows through human’s fingers and voltage difference between fingers is measured • AC current is preferred for it reduces changes to human’s tissue • After voltage is measured it is amplified and transmitted to PIC

  10. Connecting resistance circuit to PIC I PIC A/D I/O port A with analog input pins R V Amp General circuit Measurement borders: 5 – 25 kOhm

  11. Schedule • Finish design of resistance circuit – 1.01.03 • Learning of PIC features – 1.01.03 • Design of sound and light sources - 8.01.03 • Assembling of entire system – 22.01.03 • Programming of PIC – 15.02.03

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