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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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