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HEALTH MONITORING USING WIRELESS SENSORS AND GSM || 2014-2015

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CHAPTER 1

INTRODUCTION

In a hospital health care monitoring system it is necessary to constantly monitor the

patients physiological parameters. Although present systems allow continuous

monitoring of patient vital signs, these systems require the sensors to be placed bedside

monitors or PCs, and limit the patient to his bed. A real-time monitoring system of

some critical vital signs will be implemented. Such a system may help the doctor or

people in the family to monitor the emergency alarm from patients. In this project, we

consider three parameters of the vital signs which are Pulse rate, Human body

temperature and ECG. The data helps to prevent and protect the patients.

Wireless technology is used in many applications that have become a part of

human activities such as agriculture, military, medical care, smart home system etc.

Distinctly, wireless sensor networks (WSN) play a crucial role in such monitoring

systems, for the reason that WSN can offer some advantages over other types of

wireless systems, especially its scalability and flexibility of architecture. In this Project,

a group of sensors have been implemented for measuring Pulse rate, body temperature

and ECG with real-time monitoring system based on ZigBee wireless network.

This project incorporates sensors to measure parameters like body temperature,

heart beat rate and IR pulse rate sensors. A micro-controller board is used for analyzing

the inputs from the patient and any abnormality felt by the patient causes the monitoring

system to give an alarm and the SMS to the doctor and concerned authorities. Also all

the process parameters within an interval selectable by the user are recorded to the

common computer.

This is very useful for future analysis and review of patients health condition.

For more versatile medical applications, this project can be improvised, by

incorporating dental sensors and annunciation systems, thereby making it useful in

hospitals as a very efficient and dedicated patient care system.


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CHAPTER 2

LITERATURE SURVEY

The health monitoring task is achieved by telemedicine (enabling medical infor-

mation exchange as the support to distant decision making) and telemonitoring (ena-

bling simultaneous distant monitoring of patient and his vital function) that monitors

the changes in ECG signals and provide feedback to help maintain an optimal heart

status. Wireless ECG sensor module is realized by using an eZ430-RF2500 which is a

complete MSP430 wireless development tool providing all the hardware and software

for the MSP430F2274 microcontroller and CC2500 2.4GHz wireless transceiver. On

the personal server module, visualization and analysis software are implemented. This

software has the following facilities: GUI (Graphic Interface) for ECG waveforms; dis-

plays the patients parameters received from the sensors; sends the commands and med-

ical decisions. [1]

There are many advantages of using this type of sensor. It can be used for broader

range of patients and medical professionals and those people living in rural or isolated

regions. It reduces cost and time. It provides the best health care and flexible capable

of measuring, pre-processing and transmission ECG info to personal server. This type

of sensor can be used for those patients that has a longer time span than normal span

and the proposed system could also be used as a warning system for monitoring during

normal activity or physical exercise.

The system architecture for smart healthcare based on an advanced Wireless Sen-

sor Network (WSN). It specifically targets assisted-living residents and others who may

benefit from continuous, remote health monitoring. It presents best practices in wireless

sensor network design for health care applications. Based on the most important aspects

like power efficiency and security which guide the development of a wireless sensor

network based applications. The sensor boards handle acquisition of physiological sig-

nals and pre-processing. For example, the ISPM samples three independent accelerom-

eter axes each at a rate of 200 Hz. The raw accelerometer data is filtered and pre-pro-

cessed. The filtering includes moving an average filter to eliminate high frequency

movement artifacts, and separation of low and high frequency components of the ac-


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celeration signal. Sensor orientation can be calculated as the angle between low fre-

quency accelerometer components. User activity is estimated with a function based on

the Sum of the integrals of the AC components in each channel. [2]

Thus, also the ongoing miniaturization allows building tiny computers that are

able to observe all kinds of physical phenomena. Structural Health Monitoring (SHM)

has the potential to dramatically reduce lifecycle costs, safe useful life of a structure,

shrink insurance costs, decrease the need for expensive repairs, and circumvent com-

plete failure of the monitored structure.

A portable real-time wireless health monitoring system also provides an accurate

result which is used for remote monitoring of patients pulse rate and oxygen saturation

in blood. The system was designed and implemented using ZigBee wireless technolo-

gies. All pulse oximetry data are transferred within a group of wireless personal area

network (WPAN) to database computer server. The developed real-time pulse oximetry

monitoring system has a pair of light-emitting diodes (LEDs), One of LED has a wave-

length in red and other one is in infrared region. The light was detected by a photodiode.

The LEDs and photodiode was packed in Velcro strip that facing through a patients

fingertip. The pulse oximetry data was kept and calculated by microcontroller unit. [3]

The basic wireless technologies which currently healthcare systems are RFID,

Bluetooth, ZigBee and wireless sensor network which gives innovative medium for

data transmission in the field of medicine. WBAN usually uses Zigbee. One of many

applications of WBAN in medical domain is computer assisted physical rehabilitation.

Intelligent sensors used by patients transmit vital signs to personal server sequentially;

the data is transmitted from personal server to servers of the healthcare system, such as

weather forecast, medical database or emergency server over Internet. Algorithms may

be executed on the healthcare system servers to give instant and patient-specific rec-

ommendations. [4]


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CHAPTER 3

Problem Statement

Health monitoring system is mandatory to constantly monitor the patients phys-

iological parameters. Although present systems allow constant monitoring, these sys-

tems require the sensors to be placed in such a way that it limits the patient to his bed.

This Project focuses on creating a Health monitoring System using Wireless

Body sensor networks (WBAN) and can help people by providing healthcare services

such as medical monitoring, medical data access, and communication with the

healthcare provider.

The Project contains three sensors to monitor the human body temperature,

Pulse Rate and ECG. The sensed information is sent to a Microcontroller through signal

conditioning circuit in the patient unit. A desired amount of sensor value is set and

if it is exceeded the sensor information will be transmitted from the patient unit to the

main controller unit with the help of a ZigBee communication system which is con-

nected with the Microcontroller in both the units. The main controller unit will send the

sensed data of the patient by the help of a GSM Module to the physician. The physician

can receive the SMS sent by GSM module and check the vitals of the patient. The

message is sent to a mobile phone using Global system mobile (GSM) Modem.

MAX232 will act as a driver between the microcontroller and the modem.

The Project would benefit the patient as the patient will no longer be confined

to the hospital bed as the sensors are wearable nor any assistant doctor or nurse will be

required to log the health vitals of the patient manually thus reducing any possible hu-

man error.


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CHAPTER 4

Methodology

4.1 Need of components:

4.1.1 AT89S51: 89S51 over 8051 due to the following reasons: For 8051

we have to install its corresponding software for writing program on PC. For

8051 we will write program. In Keil which is freely available on internet for

downloading.

4.1.2 MPC3208: The MPC3208 12-bit Analog-to-Digital Converter (ADC)

combines high performance and low power consumption in a small package.

The chip we are using has eight separate ADC channels we can use. The

MCP3208 works at 3-5 volts, and can take 50,000 samples per second (50 kHz)

with 12 bits of resolution.

4.1.3 Level Converter: To convert the bipolar voltage signal into unipolar

format. We can use any level converter IC satisfying the electrical specifications

of microcontroller. We chose to use MAX 232 IC.

4.1.4 Voltage Regulator: It is a standard practice to provide voltage reg-

ulation by using ICs. We choose to use a fixed output voltage providing regu-

lator IC 7805.

4.1.5 DB107: It is a bridge rectifier. A bridge rectifier is an arrangement of

four or more diodes in a bridge circuit configuration which provides the same

output polarity for either input polarity. It is used for converting an alternating

current (AC) input into a direct current (DC) output.


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4.1.6 Serial Interfacing: For serial transfer of code we need a serial in-

terfacing cable .Depending on the distance between the door and the PC we

choose serial interface required. We choose to use RS 232 which provides sep-

aration of 300 m. & data transfer rate of 330 kb/s.


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4.2 Methodology

The project begins with the study of different types of sensors such as pulse rate, heart-

beat, blood pressure, temperature and ECG.

The most important part of our project was to write the program in keil for the micro-

processor whose algorithm is given below:

Define input and output ports

-Input ports: ADC and switch

-Output ports: LCD and Buzzer

Set the required timer 0 and serial port.

Initializing the UART , LCD, message and GSM modem

Set a_flag=0 so that command is not sent from GSM which will be a false

command in the beginning as the system is switched on.

Set mode_set=1 for Normal Mode which includes pulse rate and temperature

sensor.


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Set mode_set=0 for ECG mode

If old value of parameters equals the new value message will not be sent again.

If new value is less than or greater than threshold value a message will be sent

to physician.

Stop

Based upon the above algorithm the program was written and debugged. The errors

occurred were rectified and run successfully.

4.3 Circuit Board Assemblance:

It basically consists of PCB (printed circuit board) design , PCB making and

soldering. These processes are explained below, in brief.

4.3.1 PCB Layout :

Printed circuit board is a piece of art. The performance of an electronic circuit

depends upon layout and design of PCB. Printed circuit boards are used to route elec-

trical current through copper tracks, which are firmly bonded to an insulating base. The

PCB layout was designed in EAGLE Version 4.11. . Depending upon the number of

component and the area of the board the layout will be single layered or multi layered.

The details of this are given in chapter 4.

4.3.2 Soldering:

In single sided PCB, the conductor tracks runs only on one side of copper clad

board. Thus crossing of conductor is not allowed .While soldering care must be taken

that the pads are not burned while soldering and no short circuit occurs while soldering.

4.4 Graphical User Interface:

To make the information of employee entrance/exit and to make the circuit user

friendly we have designed a user interface in VISUAL BASICS 6.0. In VB, we have

designed a form which contains of textbox, captions, labels, hardware triggering icon

and other required components, usually used in VB programming.


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CHAPTER 5

Project Description

5.1 PROJECT HARDWARE

5.1.1 BLOCK DIAGRAM-

Figure 5.1: Block diagram of system


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5.1.2 EXPLANATION OF THE BLOCK DIAGRAM

Information is gathered using wearable sensors such as temperature, pulse and ECG

and transmitted to the micro controller AT89S51. The microcontroller AT89S51 is used

for the purpose of transmitting and receiving data. The vital parameter measured by the

IR Pulse rate sensor is connected to pin 2 of port 3 of the microcontroller which acts as

a timer while the information from the Temperature sensor is sent to the analog to dig-

ital convertor, MCP3208 which is 12 bit converter and has 8 input channels. This con-

vertor in turn is connected to port 1 of microcontroller which is an I/O port. The data is

continuously streamed through ZigBee to a personal Computer. This way the medical

history of the patient is maintained which can be referred to anytime. ZigBee module

NRF24L01 is used for the above purposes. GSM modem sim900 has also been used in

the above system so as to send an automated message to the physician in case the vital

parameters fall or increase from the threshold value .The modem receives information

from RS232 which acts as a protocol converter. A buzzer is also attached to the system

and it will act as an alarm system in case of emergency situations. This system works

on a 5V power supply.

The system consists of three major units:

1) Patient unit: The patient unit consists of three different types of sensors to measure

the temperature, Pulse rate and ECG of the human body in its working environment.

The sensors are connected on the basis of Wireless Body Sensor Network (WBAN).

The microcontroller of the patient unit acquires the sensor information by the help of

the signal conditioning circuit and in the meantime microcontroller passes that acquired

information the Main Controller Unit by the help of the ZigBee transmitter module.

2) Main Controller unit: The main controller unit consists of ZigBee module and

GSM modem. The information of the patient unit is received by the microcontroller

and displayed on the LCD of the controller unit. Buzzer is for providing warning in any

critical condition. By the use of the GSM modem all the information of the patients

vital parameters will be transmitted to the Physicians mobile as a SMS.

3) Observer unit: This unit consists of Physicians mobile phone and the personal

computer which will be storing the physiological parameters of the patient.


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5.1.3. List of Components:

1] ICs used:

Sr No. NAME OF COMPONENT No. used. IC No.

1 Microcontroller 1 89S51

2 Level converter 1 MAX 232

3 ADC 1 MPC3208

4 Voltage regulator 1 LM 7805

2] Other components:

Sr No. NAME OF COMPONENT No. Used Value

1 Resistor pull up package 1 --------

2 LM358 3 --------

3 Crystal 1 11.0592MHz

4 LEDs 2 2 v

5 Bridge Rectifier DB107 1 --------

6 Capacitors 18

1

1

6

0.01mF/16 v

0.1mF/25 v

1mF/25 v

33pF/10 v

7 Resistors 3 330 ohms/ 0.25 w

8 Switches 1 SPST

9 RS 232C(serial connector) 1 --------

10 Zigbee Module- NRF24L01 2 --------

11 GSM Module-SIM 900 1 --------

12 LCD 16x2 Display 1 --------


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5.1.4 COMPONENT SPECIFICATIONS-

Microcontroller AT89S51:

The AT89S51 is a low-power, high-performance CMOS 8-bit microcomputer with 4K

bytes of Flash programmable and erasable read only memory (PEROM). The device is

manufactured using Atmels high-density nonvolatile memory technology and is

compatible with the industry-standard MCS-51 instruction set and pinout. The on-chip

Flash allows the program memory to be reprogrammed in-system or by a conventional

nonvolatile memory programmer. By combining a versatile 8-bit CPU with Flash on a

monolithic chip, the Atmel AT89S51 is a powerful microcomputer which provides a

highly-flexible and cost-effective solution to many embedded control applications.

The AT89S51 provides the following standard features: 4K bytes of Flash, 128 bytes

of RAM, 32 I/O lines, two 16-bit timer/counters, a five vector two-level interrupt

architecture, a full duplex serial port, on-chip oscillator and clock circuitry. In addition,

the AT89S51 is designed with static logic for operation down to zero frequency and

supports two software selectable power saving modes. The Idle Mode stops the CPU

while allowing the RAM, timer/counters, serial port and interrupt system to continue

functioning. The Power-down Mode saves the RAM contents but freezes the oscillator

disabling all other chip functions until the next hardware reset.

Figure 5.2: Pin diagram of AT89S51


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LCD 16x2: LCD is a liquid crystal display9 and there are 14-pin and 16-pin displays.

Among them 16-pin display is used which has additional features than 14-pin like

background color transition and more than 80 characters are displayed. RS pin resets

the display after some delay, 4 data lines are connected to MCU.

Figure 5.3: LCD display

LM358 Operational amplifier-

Large Dc Voltage Gain: 100dB

Wide Bandwidth (Unity Gain): 1.1mHz (Temperature Compensated)

Very Low Supply Current/Op (500A) Essentially Independent Of Supply

Voltage

Low Input Bias Current: 20nA (Temperature Compensated)

Low Input Offset Voltage: 2mv

Low Input Offset Current: 2nA

Input Common-Mode Voltage Range Includes Ground

Differential Input Voltage Range Equal To The Power Supply Voltage

Large Output Voltage Swing 0v To Vcc - 1.5V

Figure 5.4:LM358 operational amplifier


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Resistors- A resistor is a passive two-terminal electrical component that implements

electrical resistance as a circuit element. Resistors act to reduce current flow, and, at

the same time, act to lower voltage levels within circuits. In electronic circuits resistors

are used to limit current flow, to adjust signal levels, bias active elements, terminate

transmission lines among other uses.

Light Dependent Resistor (LDR) - A photo resistor or light-dependent resistor (LDR)

or photocell is a light-controlled variable resistor. A photo resistor can be applied in

light-sensitive detector circuits, and light- and dark-activated switching circuits.

Figure 5.5: Resistors

Figure 5.6: LDR


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A photo resistor is made of a high resistance semiconductor If incident light on a photo

resistor exceeds a certain frequency, photons absorbed by the semiconductor give

bound electrons enough energy to jump into the conduction band..The resulting free

electron and the whole partners conduct electricity, thereby lowering resistance.

The resistance of the photo resistor decreases with increasing light intensity ,in other

words , it exhibits photo conductivity.

LM35 Temperature Sensor -It is also known as analog temperature sensor. It pro-

vides a voltage output that is linearly proportional to Celsius (temperature. It uses a

solid state technology to determine the temperature. If the temperature increases

means voltage also increases. By amplifying the voltage change it is easy to generate

an analog signal which is directly proportional to temperature. They are precise, never

wear out, dont need calibration work for any environmental conditions. It can be con-

sistent between sensor and readings. In our project we are converting celsius into Far-

enheit by using the formula:- F = C x 1.8 + 32

Bridge Rectifier DB107-

Surge overload rating to 30 Amperes peak

Ideal for printed circuit board

Reliable low cost construction utilizing molded

Figure 5.7:LM35 Temperature


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Plastic material has UL flammability classification94V-O

Polarity symbols molded on body.

Capacitors-

A capacitor is an electrical/electronic device that can store energy in the electric field

between a pair of conductors (called "plates"). The process of storing energy in the

capacitor is known as "charging", and involves electric charges of equal magnitude, but

opposite polarity, building up on each plate.

Capacitors are often used in electric and electronic circuits as energy-storage devices.

They can also be used to differentiate between high-frequency and low-frequency sig-

nals. This property makes them useful in electronic filters.

Figure 5.8: Bridge Rectifier DB107

Figure 5.9:Capacitors


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Crystal Oscillator- A crystal oscillator is an electronic circuit that uses the mechanical

resonance of a vibrating crystal of piezoelectric material to create an electrical signal

with a very precise frequency. This frequency is commonly used to keep track of time

(as in quartz wristwatches), to provide a stable clock signal for digital integrated cir-

cuits, and to stabilize frequencies for radio transmitters/receivers. We use a 11.0592

MHz crystal oscillator.

RS 232 C- It is a serial interface between the sensors and the micro controller .It is

connected to sensors through 16 pin socket.

MAX 232- It is a level converter which will convert the bipolar code received through

RS232C to unipolar format that is 0 to +5V.

NRF24L01 Zigbee module-

NRF24L01 RF Module is a trans receiver module which provides easy to use RF com-

munication at 2.4 Ghz. It can be used to transmit and receive data at 9600 baud rates

from any standard CMOS/TTL source. It works in half duplex mode.

Features:

Supports Baud rate 9600

Works on ISM band (2.4 GHz)

1 to 30 bytes dynamic payload length

Automatic packet handling

Authentication based packet communication

No complex wireless connection software of RF is required to connect our serial devices.

No external Antenna required.


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SIM900A Module-

SIM Com has created an ultra-compact wireless module-SIM900. It is a complete

Quad-band

GSM module and designed with a very powerful single-chip processor integrating

ARM926EJ-S core.

Featuring an industry-standard interface, the SIM900 delivers GSM

850/900/1800/1900MHz performance for voice, SMS, Data, and Fax in a small form

factor and with low power consumption. With a tiny configuration of 24mm x 24mm

x3 mm, SIM900 can fit almost all the space requirements in your M2M applications,

especially for slim and compact demands of design.

General features

Quad-Band 850/ 900/ 1800/ 1900 MHz

Compliant to GSM phase 2/2+

Class 4 (2 W @850/ 900 MHz)

Class 1 (1 W @ 1800/1900MHz)

SAIC (Single Antenna Interference Cancellation)

Control via AT commands (GSM 07.07 , 07.05 and SIMCOM enhanced AT Com-

mands)

SIM application toolkit

Supply voltage range: 3.2V to 4.8V

Low power consumption: 1.0mA

Figure 5.10: GSM Sim900 module


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CHAPTER 6

IMPLEMENTATION

The schematic of Health monitoring system including IR Pulse Rate Sensor, ECG has

been made using EAGLE which is a powerful graphics editor for designing PC-board

layouts and schematics. The Graphic User Interface has been created using Visual

Basics version 6 to display Temperature and pulse rate parameters. The parameters are

streamed to the Pc using Zigbee Module.

6.1 SOFTWARE IMPLEMENTATION

EAGLE stands for Easily Applicable Graphical Layout-Editor developed by CadSoft

Computer . It is a flexible, expandable and scriptable EDA(Electronic design

automation) application with schematic capture editor, PCB layout editor.

EAGLE contains a schematic editor, for designing circuit diagrams. Parts can be placed

on many sheets and connected together through ports. We use the ADD command to

add the components and the symbols for +5V, V+, and GND from supply1.

6.1.1 SCHEMATIC CAPTURE-

Figure 6.1: IR Pulse Rate Sensor Schematic


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6.1.2 PCB Layout:

The PCB layout editor allows back annotation to the schematic and auto-routing to

automatically connect traces based on the connections defined in the schematic.

Figure 6.2: PCB Layout Component Placement

Figure 6.3: PCB Layout


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6.1.3 SCHEMATIC CAPTURE OF THE WHOLE CIRCUIT

Figure 6.4: Schematic of the whole circuit


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6.1.4 Graphic User Interface Using Visual Basic

Visual Basic is a third-generation event-driven programming language and integrated

development environment (IDE) from Microsoft for its COM programming model first

released in 1991.

Forms are created using drag-and-drop techniques. A tool is used to place controls (e.g.,

text boxes, buttons, etc.) on the form (window). Controls have attributes and event

handlers associated with them. Default values are provided when the control is created,

but may be changed by the programmer. Many attribute values can be modified during

run time based on user actions or changes in the environment, providing a dynamic

application. For example, code can be inserted into the form resize event handler to

reposition a control so that it remains centered on the form, expands to fill up the form,

etc. Visual Basic can create executables (EXE files), ActiveX controls, or DLL files,

but is primarily used to develop Windows applications and to interface database

systems. In this project we have used three boxes displaying Comm Port No. , Input

Length which is the length of string it will receive and the RThreshold. Temperature

and Pulse rate parameters will be displayed using this application and will be sent to

the PC using Zigbee module.

Figure 6.5: GUI


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6.1.5 Microcontroller coding using Keil:

The coding of Microcontroller is done using embedded C and the software used

for coding is Keil Vision 3.The ANSI standard Keil Vision 3 compiler is specifically

designed for the 8051 and 8951 microcontroller families. Extensions incorporated into

the compiler support all resources of your embedded hardware and allow efficient ac-

cess to interrupts, register banks, SFRs, and memory spaces. The Vision 3 configura-

tion wizard simplifies editing the startup code (and many other configuration files). A

graphical interface helps you quickly select the options that match your target system

and easily spot potential startup problems. Since the microcontrollers came into picture

in the early sixties, the need for simulation of various program codes was felt. Initially

the technique of downloading the code on the circuit board was used but it was time

consuming and uneconomical. Hence was the need to develop software to debug the

microcontroller related code programs directly. This need resulted in the development

of Keil.


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6.2 HARDWARE IMPMENTATION

IMPLEMENTATION OF SENSORS

6.2.1 IR PULSE RATE SENSOR

Block Diagram-

WORKING -

Heart beat sensor is designed to give digital output of heart beat when a finger

is placed on it. When the heart beat detector is working, the red LED with 660nm wave-

length flashes in unison with each pulse. Because the flow of blood is pulsatile in na-

ture, the transmitted light changes with time. A normal finger has light absorbed from

bloodless tissue, venous blood, and arterial blood. The volume of arterial blood changes

with pulse, so the absorption of light also changes. The light detector will therefore see

a large DC signal representing the residual arterial blood, venous blood, and bloodless

tissue. When the photodiode detects light, a current is created proportional to the inten-

sity of the light detected. This current is converted into voltage using a differential cur-

rent-to-voltage amplifier, followed by signal conditioning circuit consisting of low pass

and high pass filters. The Filtered output is passed on to a ZigBee module through

which Pulse Rate will be stored in the Microcontroller.

Figure 6.6: Block Diagram of IR Pulse Rate


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Circuit diagram:

We implemented the circuit of IR Pulse Rate on the breadboard-

Figure 6.7: Circuit Diagram of IR Pulse Rate

Figure 6.8: Breadboard Implementation


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PCB Track of Pulse Rate Sensor-

Figure 6.10: Assembled pulse rate sensor with Ring

Figure 6.9: PCB Layout of Pulse Rate sensor


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6.2.2 ECG Sensor

Working-

The sensor requires three connections to the right arm (RA), left arm (LA) and right leg

(RL) of the patient. We make use of Instrumentation Amplifiers (INAs) to condition

small signals in the presence of large common-mode voltages and DC potentials so we

choose Analog instrumentation amplifier to amplify the ECG voltage from electrodes,

Figure 6.11: Circuit Diagram of ECG Sensor

Figure 6.12: Connections for ECG Sensor


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which is in the range of 1mV to 5mV.we have designed the instrumentation amplifier

using op-amp LM358, with a gain of 1000 and power supply is +12V to -12V. It

contains following signal conditioning unit:-

Low pass filter:

This block is used to remove the unwanted signals like noise, the frequency range of

ECG is 0.04HZ to 150 Hz, and so the low pass filter is designed with the cut off

frequency of 150HZ.

Amplifier:

It consists of a simple non inverting amplifier which is designed to saturate the ECG

signals, and the output of amplifier is fed to the microcontroller to count the heart rate.

Microcontroller AT89S51 is being used in our project for counting of the pulses. It

takes the conditioned square pulses from hardware system as an input and counts it for

one minute, which is the required heart rate count.

Figure 6.13: ECG Sensor


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6.2.3 INTERFACING UNIT

The Interfacing unit consists of micro controller, MAX232,ADC,Buzzer,RS232

connection port.This unit is responsible for conditioning of the signal,converting the

values of the parameters received and sending it to the GUI and Access Port Software

to display the results.

PCB Track of the Interfacing Unit-

Figure 6.14: PCB Layout of Interfacing Unit


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Figure 6.15: Front of the Interfacing Unit

Figure 6.16: Assembled Interfacing Unit


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CHAPTER 7

RESULTS

Temperature and Pulse Rate is displayed on the LCD and the parameters are also

displayed on the GUI through Zigbee so as to maintain a History of the patients

continuous monitoring.

Figure 7.1: Result displayed on LCD

Figure 7.2: Result displayed on GUI


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This is the Access port software which displays the magnitude of the ECG wave. The

computer is connected via RS232 to comm port1 at 9600 baud rate and data is streamed

to the software.

Figure 7.3: Magnitude of ECG displayed on Access Port


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An Automated message is sent to the local physicians mobile whose number is al-

ready inserted in the program.

The threshold values set for temperature and pulse rate are as follows:-

-Temperature rises above 102 F.

-Pulse rate falls below 30 ppm or rises above 150 ppm.

Figure 7.4: Text message sent to doctor


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CHAPTER 8

ADVANTAGES AND APPLICATIONS

ADVANTAGES

This system has the following advantages:

Easy and reliable for Doctors: In a hospital, either the nurse or the doctor has

to move physically from one person to another for health checkup, due to which

continuous monitoring becomes difficult.

Increased Efficiency: The number of nurses required for keeping a check on

patients in ICU can be reduced to a large extent.

More Accurate: Chances of human error in checking health parameters is also

reduced, also the database is formed and updated regularly.

APPLICATIONS

This system can be used for the following purposes:

Continuous monitoring: It can be used in hospitals on operated patients for

monitoring their vital parameters.

Record Keeping: This system consists of a GUI and an access terminal

software which can maintain the history of the patients.


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CHAPTER 9

CONCLUSION

The project provides low-cost solution to enhance the remote monitoring

capability of existing health care system by using ZigBee wireless standard and GSM

modem. It uses three sensors such as IR Pulse rate, Body temperature and ECG data

monitoring. The sensors are operated and vital information is transmitted to the

microcontroller. By using this prototype circuit containing AT89S52 MCU, GSM

Modem, and other hardware circuit the messages can be transmitted in case the value

of any parameter falls below a predetermined value to the corresponding medical expert

so that necessary medication can be given to the patient. The system can be installed

for testing the health parameters of patients in their home for health care monitoring

and the wireless sensor network can operate on an area of 6-10 square meters.


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CHAPTER 10

FUTURE SCOPE

The future scope of this system would be a wireless sensor network architecture for

smart homecare that possesses the essential elements of each of the future medical

applications,namely:

-integration with existing medical practices and technology,

-Real time, long-term, remote-monitoring,

-Miniature,wearablesensors,and

- Assistance to the elderly and chronic patients.

It extends healthcare from the traditional clinic or hospital setting to the patient's home,

enabling telecare without the prohibitive costs of retrofitting existing dwellings. Patient

tracking module can be included in the system using GPS. Further efforts are necessary

to improve quality of service of wireless communication, reliability of sensor nodes,

security, and standardization of interfaces and interoperability


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References

[1] Cristian Rotariu, Hariton Costin,Dragos Arotaritel, Bogdan Dionisie, A

WIRELESS ECG MODULE FOR PATIENT MONITORING NETWORK,

2008 .

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