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2018-2019 Matlab Projects

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2018-2019 Matlab Projects

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  1. http://www.projectsatbangalore.com A DIGITAL INSTRUMENT FOR VENOUS MUSCLE PUMP TEST

  2. Objective • To design and develop a prototype digital instrument to measure venous refilling time (VRT) and muscle pump capacity (MPC) for a Varicose Veins patient. http://www.projectsatbangalore.com

  3. Abstract • Design and development of a prototype unit to measure venous refilling time (VRT) and muscle pump capacity (MPC) during a venous muscle pump test (VMPT) is presented here. • Instead of normalizing the photo-plethysmo-graph (PPG), as is common in the VMPT instruments in vogue, a suitable signal processing technique that extracts a signal proportional only to the blood volume changes underneath the PPG sensor is employed.

  4. Block Diagram P I C M I C R O C O N T R O L L E R OP-AMP MAX232 PPG SENSOR POWER SUPPLY RS232 PC 16 X 2 LCD DISPLAY

  5. Block Diagram - Description • The hardware consists of a IRL81A sensor connected to the op-amp and a microcontroller unit for data acquisition, processing and display. • The analog signal is fed to one of the inputs of the 8-channel 10-bit A/D converter of the microcontroller. The built-in ADC of the PIC microcontroller converts analog to digital signal for processing. • The calibrated values are sent to the PC via RS232 port. • Thus Venous refilling time (VRT) and Muscle Pump Capacity (MPC) provides valuable information on the health of the veins, especially of the lower limbs of a patient.

  6. Hardware Used • PIC 16F877A • 16X2 LCD • IRL81A Sensor • MAX 232 IC • OP-AMP - LM358 • Power Supply • Transformer • Bridge Rectifier • Capacitor • 7805 Regulator

  7. Software Used • Matlab • Embedded C

  8. PIC16F877A • PIC16F877A 8-bit Micro controller is a small piece of semiconductor integrated circuit from Microchip Company. • Features: • 8 channels of 10-bit Analog-to-Digital (A/D) converter • Operating speed: 20 MHz • Data Memory: 368 bytes • EEPROM: 256 bytes • Flash Memory: 8KB • In-Circuit Serial Programming

  9. PIC16F877A - PIN DIAGRAM

  10. LCD • A liquid crystal display (LCD) is a flat panel display, electronic visual display, or video display that uses the light modulating properties of liquid crystals (LCs). LCs do not emit light directly. • LCDs are more energy efficient and offer safer disposal than CRTs • Its low electrical power consumption enables it to be used in battery-powered electronic equipment

  11. LCD 16X2 - PIN DIAGRAM

  12. IRL 81A Sensor

  13. MAX 232 • The MAX232 IC is used to convert the TTL/CMOS logic levels to RS232 logic levels during serial communication of microcontrollers with PC. • The controller operates at TTL logic level (0-5V) whereas the serial communication in PC works on RS232 standards (-25 V to + 25V).

  14. MAX232 - PIN DIAGRAM

  15. OP-AMP –LM358 • The LM358 is a dual operational amplifier IC that we use to build the op amp circuit. • It consists of two independent, high gain, internally frequency compensated operational amplifiers which were designed specifically to operate from a single power supply over a wide range of voltages. • Wide Power Supply Range: • Single Supply: 3V to 32V. • Dual Supplies: ±1.5V to ±16V.

  16. LM358 – PIN Diagram

  17. TRANSFORMER • A Transformer is a static electrical device that transfers energy by inductive coupling between its winding circuits. • Voltage: 12 • Current Rating: 500 Milliamps

  18. BRIDGE RECTIFIER • A diode bridge is an arrangement of four (or more) diodes in a bridge circuit configuration that provides the same polarity of output for either polarity of input. • The conversion of an AC input into a DC output, it is known as a bridge rectifier.

  19. Capacitor • Filter capacitors are capacitors used for filtering of undesirable frequencies. • Capacitance : 470µf

  20. REGULATOR - 7805 • LM7805 three terminal positive regulator IC • It provides fixed output voltage of 5 Volt • LM7805 Features: * Output Current up to 1A * Output Voltages of 5 volt * Thermal Overload Protection * Short Circuit Protection * Output Transistor Safe Operating Area protection

  21. Software Used • Matlab is used to plot the MPC and VRT variations coming from the device. • Embedded C is used for programming. The Programmed hex code is then burnt into the PIC Microcontroller using PICKIT Software.

  22. Circuit Diagram

  23. Conclusion • Venous refilling time (VRT) and Muscle Pump Capacity (MPC) provides valuable information on the health of the veins, especially of the lower limbs of a patient. • The design and development of a prototype unit to measure VRT and MPC during a standard venous muscle pump test (VMPT) utilizing the method of Photoplethysmography (PPG) has been presented. • The method employs a op-amp circuit to obtain a signal proportional only to blood volume changes underneath the PPG sensor

  24. THANK YOU

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