HEALTH MONITORING SYSTEM using mbed NXP LPC11U24

BY JIGYASA SINGHM.TECH (ECE)

Health monitoring system (using mbed NXP LPC11U24)

INTRODUCTION

This project work report describes the designing of Heart rate monitoring system using mbed NXP LPC11U24 and comparing the output with on the basis of its various parameters. The basic structure include mbed microcontroller and an analog heart beat sensor. The Heart Beat Sensor is designed to provide analog output of heart beat when a finger is placed on it. When the Heart detector starts working, the top most LED will starts flashing with every heart beat. In this project, the device can continuously measure the heart rate & checks for the abnormal condition (pulse below or above normal).Whenever the device observes any unusualality it raises an alarm at local level.

Evolution of electronic monitoring of health

Today’s electronic devices can be worn on wrist, legs, chest and anywhere on body.

Theses devices communicate wirelessly to smartphones applications or other central programs.

Characterstics of a heart monitor

It allows to measure one’s heart rate in real time or record the heart rate for later study.

It is composed of a sensor which can be analog or digital.

The output is shown on lcd screen or any other display.

Advanced versions offer measurements of heart rate variability, activity, and breathing rate to assess parameters related to health.

Block diagram of heart rate monitoring system

Detail of components

1. Heart beat sensor: The Heart Beat Sensor is designed to provide analog output of heart beat when a finger is placed on it. When the Heart detector starts working, the top most LED will starts flashing with every heart beat. The output of this sensor can be connected to Micro Controller directly to measure the heart beat. It functions on the principle of light modulation by blood flow through the nerves of the finger at every pulse. The module output mode, analog output mode is simple.

Working of heart beat sensor

Connect gnd to ground ,Vcc to +5v of any board connect Out to any of the port pins. Keep the finger in between the phototransistor and IR diode.Check the variationin LED.It counts the number of pulses.

2. Microcontroller

Following are the functions of microcontroller: 1. Reading sensor values through ADC (analog to

digital convertor) 2. Reading longitude and latitude from GPS modem. 3. Reading heartbeat and temperature values. 4. Displaying these values on LCD display. 5. Sending these values to modem so that SMS can

be sent to the Doctor or any authorized person in hospital.

6. To turn on buzzer when any of the sensor values cross threshold level.

mbed Microcontroller

The mbed Microcontrollers are a series of ARM microcontroller development boards designed for rapid prototyping. The mbed NXP LPC11U24 Microcontroller in particular is designed for prototyping low cost USB devices, battery powered applications and 32- bit ARM® Cortex™-M0 based designs. It is packed as a small DIP form-factor for prototyping with through-hole PCBs, stripboard and breadboard, and includes a built in USB FLASH programmer.

Pin description of mbed NXP LPC11U24

3.Other components

Temperature sensor: To measure the body temperature of the baby. This can be an analog type of temperature sensor. It gives variable output voltage as per the variations in the temperature received / sensed.

Amplifier: Since the output of temperature sensor is in millivolts. So we may need amplifier to amplify this voltage.

Analog to Digital Convertor: If microcontroller is not able to read the analog signal or analog voltage.

Buzzer: Buzzer can be used to give indication about the parameter crossing a threshold value.

Push Button: A push button can be there so that in case the person is feeling uneasy, in pain or breathlessness then he himself or person near him can manually press the button to inform others and get help.

LCD display:LCD display is used to show messages like sending SMS, SMS sent successfully. I have used 16×2 alphanumeric display. The person can inform family member or the staff from hospital like ward-boy, nurse or a doctor.

Connections for lcd interfacing with mbed

Working of heart rate monitoring system

Advantages & Applications

Advantages: 1. It is fully automated system and does not require

any human attention. 2. Automatic alert system gives intimation to

required persons.3. It provides a feature of remote monitoring of

person’s parameters. 5. Applications : 1. This project can be used in home for patients or

ill person or old person. 2. Same project can be used in hospitals.

Thank you..