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    Siddaganga Institute of TechnologyTumkur 572103

    ELECTRICAL AND ELECTRONICS ENGG.

    DEVELOPEMENT OF A MEDICAL REHABILITATION

    AID.GUIDED BY:-

    Madhu B.M.

    Assistant Professor

    BY:-

    RAJVARDHAN

    RAM MOHAN

    ROHIT KUMAR

    RUPESH KUMAR

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    Gives indication about extra pressure onoperated leg or hip.

    An insole integrated sensor is used to measure

    the load.All the operations are continuously monitored

    by the microcontroller.

    Blood pressure measurement.

    Body temperature measurement.

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    BLOODPRESSURE

    SENSING UNIT

    TEMPERATURESENSING UNIT

    MICRO-CONTROLLER

    BUZZER ALARM

    DISPLAY

    INSOLE LOADSENSING UNIT

    DC POWERSUPPLY

    BLOCK DIAGRAM

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    Principle of Load Measurement

    Capacitance is given by

    The capacitance will vary by the variation of spacebetween the conducting plate due to applied pressure.

    The area of the plate and the dielectric constant of themedium will be constant.

    The capacitance is converted into digitalized form by theIC AD7142 .

    dAC

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    Load Sensor Design

    Study of all project related papers to start the design.

    Specifications :Local sole material.

    Can sheet as conducting layer.

    Conducting electrodes of different diameters.

    Diameters are 20mm, 30mm and 40mm.

    Instant adhesive is used.

    Work Carried Out

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    Relative force distribution on the foot area.

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    SOLE LOOK

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    SOLE LOOK

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    Portable Digital LCR meter is suitable forhigher Capacitance.

    Measurement was done by Conventional type

    LCR meter.Sole Capacitance of the order of Pico farad.

    Variation 9.6 pf to 5.5 nf.

    Screw gauge used for thickness measurement.Sole thickness 8.792mm.

    Conducting plate thickness 0.1475mm.

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    SCREW GAUGE

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    Sole is unable to regain its shape

    completely.

    Conducting plate thickness causing

    flexibility problem.

    Node formation on the plate duringsoldering.

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    EPDM Rubber suitable for sole material.

    Good insulator.

    Better shape regaining capability.

    Available in different types of thickness.

    Thin Aluminum foil is suitable for input layer.

    Provides better flexibility.

    Conducting glue is suitable instead of soldering wir

    Future work :

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    Work carried out :

    Study of CDC ic AD7142 .

    Specifications :

    14 Input channels .

    High resolution.

    On chip calibration.

    Variation of load is converted into digital form.

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    Specifications :

    8 bit Philips microcontroller of 8051 series

    (P89v51RD2).

    Crystal frequency is 11.0592 Mhz.

    1024 bytes RAM and 64K bytes ROM.Three 16-bit timers.

    8 interrupt sources.

    Work Carried Out :

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    Program will be written in C-code andburned using software and burner kit.

    Software used are

    Keil uvision4

    Flash magicSome demo programs are written and

    tested.

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    It is a cross compiler which converts c-code to hex code.

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    This software is used to burn Philips ICs.

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    PROGRAMMAR KIT

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    Development of programs and testing .

    Design of required circuit.

    Substitute for AD7142 or getting the same.

    Interfacing of AD7142 with controller.

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    Work carried out

    Study of various papers related to measurement of

    blood pressure and discussion with guide.Measurement by conventional methods

    Systolic Method

    Diastolic MethodCuff

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    Measurement by Scientific methods using

    Blood sensor BP01Amplifier

    ADC0804

    Microcontroller

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    AMPLIFIER ADC

    MICRO-CONTROLLER

    DISPLAY

    BLOODPRESSURESENSOR

    DC POWERSUPPLY

    BLOCK DIAGRAM OF BLOOD SENSINGUNIT

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    Blood Pressure Sensor

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    Design of blood pressure measurement circuit.

    Interfacing of blood pressure sensor.

    Design of body temperature measurement unit.

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