This document describes an IoT-based patient health monitoring system. The system collects patient vital signs like ECG, temperature, and heart rate using sensors. The sensor data is transmitted to a microcontroller and then sent to the cloud using WiFi. If any abnormal readings are detected, the system alerts caregivers. The system allows for remote monitoring of elderly or chronically ill patients to avoid long hospital stays. It records health data over time which can be useful for future analysis and review of a patient's condition. The system could be improved in the future by adding sensors to monitor additional vitals like blood pressure.
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IOT_BASED_PATIENT_MONITORING_SYSTEM_Anan.docx
1. ABSTRACT
Commattoes Patient Health Monitoring is a project that utilizes the Internet of
Things (IoT) platform to monitor and track the health parameters of patients in
real-time. The project integrates the Thingspeak IoT platform and Ubidots data
visualization platform to collect, analyze, and display the patient's vital signs.
This report presents a detailed overview of the project, including its objectives,
system architecture, implementation details, and future enhancements.
Monitoring your beloved ones becomes a difficult task in the modern day life.
Keeping track of the health status of your patient at home is a difficult task.
Especially old age patients should be periodically monitored and their loved ones
need to be informed about their health status from time to time while at work. So
we propose an innovative system that automated this task with ease. Our system
puts forward a smart patient health monitoring system that uses Sensors to track
patient health and uses internet to inform their loved ones in case of any issues.
Our system uses temperature, ECG& heartbeat rate sensing to keep track of
patient health.
The sensors are connected to a microcontroller to track the status which is in turn
interfaced Wi-Fi connection in order to transmit alerts. If system detects any
abrupt changes in patient heartbeat rate, ECG & body temperature, the system
automatically alerts the user about the patients status over IOT and also shows
details of heartbeat, ECG and temperature of patient live over the internet. IOT
based patient health monitoring system effectively uses internet to monitor patient
health stats and save lives on time. 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.
Also all the process parameters within an interval selectable by the user are
recorded online. This is very useful for future analysis and review of patient’s
health condition. For more versatile medical applications, this project can be
improvised, by incorporating blood pressure monitoring systems, dental sensors
and annunciation systems, thereby making it useful in hospitals as a
very efficient and dedicated patient care system.
Keywords: Internet of Things (IoT), Arduino Mega micro – controller , ECG
Sensor, Temperature Sensor
(DSB1820), Pulse Sensor, Wi-Fi module(ESP 8266)
3. TABLE OF CONTENTS
Sr No. Title Page no
1. Chapter 1 Introduction
1.1 Introduction… ....................................................................................................1
1.2 Inroduction to IOT............................................................................................. 2
2. Chapter 2 Problem Definitions & Objective 3
3. Chapter 3 Review Of Literature 4
4. Chapter 4 Proposed Methodology 5
5. Chapter 5 Tools to be used
5.1 Adruino mega 2560… ........................................................................................7
5.2 Wifi moduele….................................................................................................8
5.3 Heart Beat sensor….......................................................................................... 9
5.4 ECG ..................................................................................................................10
5.5 Temperature Sensor…..................................................................................... 11
6. Chapter6 Practical Implementation
6.1 Circuit diagram…............................................................................................13
6.2 Interfacing ESP8266 with Arduino Mega ........................................................14
6.3 Cloud Computing .............................................................................................15
6.4 Using Arduino IDE.......................................................................................... 17
6.5 Using ThingSpeak cloud service.....................................................................18
6.6 Code................................................................................................................. 19
7. Chapter 7 Results & Discussions 35
8. Chapter 8 Conclusion and Future enhancements 37
9. Chapter 9 References 38
v
4. LIST OF FIGURES
Sr.no Title Page No.
1. Introduction to IOT 1
2. IOT 2
3. Block Diagram 6
4. Arduino Mega 2560 8
5. Wifi Module ESP8266 9
6. Pulse Sensor 10
7. ECG Sensor 10
8. ECG Module 11
9. Temperature Sensor DS18B20 12
10. Circuit Diagram 13
11. ESP Interfacing with Arduino 14
12. Arduino IDE 18
13. IOT & its Applications 19
14. Result 1 35
15. Result 2 35
16. Result 3 35
vi
5. Chapter 1
1.1 Introduction
A Patient Health Monitoring System is an extension of a hospital medical system where a
patient’s vital body state can be monitored remotely. Traditionally the detection systems were
only found in hospitals and were characterized by huge and complex circuitry which required
high power consumption. Continuous advances in the semiconductor technology industry have
led to sensors and microcontrollers that are smaller in size, faster in operation, low in power
consumption and affordable in cost.
According to research, we found that approximately 2000 people died monthly due to the only
carelessness of their health. This is because they don‟t have time for themselves and forget
about their health management due to a heavy workload. The reason behind to make this project
is the growing world of technology and people forget their health checkup which is needed to
be done monthly or quarterly. As we all know that internet of things make our life easier. So,
we have decided to make an internet of things based healthcare project for people who provide
them all the personal information about their health on their mobile and they can check their all
historical health data.
The best part of this project is that it can be used by everyone and make our health management
easier than available systems. It provides a solution for measurement of body parameters like
ECG, Temperature, Moisture, and Heartbeat. It also detects the body condition and location of
the patients. This system also generates an alert when it required that means at the time of any
critical conditions and notifications about the medicines, location change, conditions etc.
Fig1.1 : Introduction to the system
6. 1.2 Introduction to IOT
The ‘Thing’ in IoT can be any device with any kind of built-in-sensors with the
ability to collect and transfer data over a network without manual intervention.
The embedded technology in the object helps them to interact with internal states
and the external environment, which in turn helps in decisions making process.
Fig 2 : IOT
In a nutshell, IoT is a concept that connects all the devices to the internet and let
them communicate with each other over the internet. IoT is a giant network of
connected devices – all of which gather and share data about how they are used
and the environments in which they are operated.
By doing so, each of your devices will be learning from the experience of other
devices, as humans do. IoT is trying to expand the interdependence in human-
i.e interact, contribute and collaborate to things.
7. CHAPTER 2
PROBLEM DEFINITION & OBJECTIVE
Patient Health Monitoring can provide useful physiological information in the
home. This monitoring is useful for elderly or chronically ill patients who would
like to avoid a long hospital stay. Wireless sensors are used to collect and transmit
signals of interest and a processor is programmed to receive and automatically
analyze the sensor signals. In this project you are to choose appropriate sensors
according to what you would like to detect and design algorithms to realize your
detection.
The objective of the project was to come up with a system that can monitor and
provide physiological information remotely in the home. The monitoring system
would be useful for elderly or chronically ill patients who would like to avoid a
long costly hospital stay. Wireless sensors would be used to collect and transmit
signals of interest and a microcontroller was programmed to receive and
automatically analyze the sensor signals.
For the devices that require instant intervention by a specialist doctor it was
important that they be autonomous, non-invasive to the patient/users everyday life
activities. In this way they were to be easy to use, minimal in size and weight,
consume less power for maximum use on a single charge, and functional – able
to withstand physical shock in the case of fall detection.
In both cases for accurate physiological signal detection, the circuitry in the detection system
was crucial. To be able to accurately collect and manage the signal information Integrated
circuits and microprocessors were implemented. This was done to minimize the drift voltages
and any white noise that could be picked by the detection system.
8. CHAPTER 3
REVIEW OF LITERATURE
1.) Patient-Monitoring Systems , Reed M. Gardner & M.Michael
Shabot , Year 2014
To meet the increasing demands for more acute and intensive care
required by patients with complex disorders, new organizational units—
the ICUs—were established in hospitals beginning in the 1950s. The
earliest units were simply postoperative recovery rooms used for
prolonged stays after open-heart surgery. Intensive-care units
proliferated rapidly during the late 1960s and 1970s. The types of units
include burn, coronary, general surgery, open-heart surgery, pediatric,
neonatal, respiratory, and multipurpose medical-surgical units. Today
there are an estimated 75,000 adult, pediatric, and neonatal intensive
care beds in the United States.
2.) IoT-Based Health Monitoring System for Active and Assisted
Living , Ahmed Abdelgawad , School of Engineering and
Technology, Central Michigan University, Mt. Pleasant, MI 48859,
USA , Year 2017.
The Internet of Things (IoT) platform offers a promising technology to
achieve the aforementioned healthcare services, and can further improve
the medical service systems [1]. IoT wearable platforms can be used to
collect the needed information ofthe user and its ambient environment
and communicate such information wirelessly,where it is processed or
stored for tracking the history of the user [2]. Such a connectivity with
external devices and services will allow for taking preventive measure
(e.g., upon foreseeing an upcoming heart stroke) or providing immediate
care (e.g., when a user falls down and needs help). Recently, several IoT
systems have been developed for IoT healthcare and assisted living
applications.
3.) IOT based health monitoring systems , Nayna Gupta & Sujata
Pandey Year 2012.
In this fast pace world, managing work and health simultaneously have
become a matter of concern for most of the people. Long waiting hours
at the hospitals or ambulatory patient monitoring are well known issues.
The issues demands for a health monitoring system which can monitor
the daily routine health parameters and heart rate monitoring seamlessly
and can report the same to the concerned person with the help of GSM
module.
9. CHAPTER 4
PROPOSED METHODOLOGY
MEASUREMENT OF RESPIRATORY RATE:
Thermister is used for the measurement of body temperature and respiratory
temperature. This thermister is a passive transducer and it’s resistance depends on
the beat being applied on it. We have arranged the sensor in the potential divider
circuit. This sensor exhibits a large change in resistance with a change in body
temperature. The respiratory rate is determined by holding the sensor near the
nose. The temperature sensor part is attached to the patient whose temperature has
to be measured, which changes the values and thus the corresponding change in
the temperature is displayed on the monitor graphically. Also all temperature
measurements are updated in the patients database. Here in our project we use
bead temperature sensor.
HEART BEAT MONITOR:
The patient’s heart beat rate is monitored using photoelectric sensor which can sense the
patient’s pulse rate. This method of tracking the heart rate is more efficient than the traditional
method which derives the same from ecg graph.
ECG SENSOR :
ECG SENSOR (piezoelectric sensor) is device that piezoelectric effect to measure pressure,
acceleration, strains or force by converting them to an electrical signal. Modes of operation can
be distinguished: transverse, longitudinal, and shear.
MEASUREMENT OF BODY TEMPERATURE
TEMPERATURE SENSOR (DS18B20) series are precision integratedcircuit temperature
sensors, whose output voltage is linearly proportional to the Celsius (Centigrade) temperature.
The LM35 does not require any external calibration or trimming to provide typical accuracies
of +-1/4 degree Celsius at room temperature and +-3/4 degree Celsius over a full -55 to +150
degree Celsius temperature range. Less to operates from 4 to 30 volt. Less than 60uA current
drain.
11. CHAPTER 5
TOOLS TO BE USED
5.1 Arduino Mega 2560
The Arduino Mega 2560 is a microcontroller board based on the ATmega2560. It has
54 digital input/output pins (of which 15 can be used as PWM outputs), 16 analog
inputs, 4 UARTs (hardware serial ports), a 16 MHz crystal oscillator, a USB
connection, a power jack, an ICSP header, and a reset button. It contains everything
needed to support the microcontroller; simply connect it to a computer with a USB
cable or power it with a AC-to-DC adapter or battery to get started.The Arduino Mega
can be powered via the USB connection or with an external power supply.The power
source is selected automatically.External (non-USB) power can come either from an AC-
to-DC adapter (wall-wart) or battery. The adapter can be connected by plugging a
2.1mm center-positive plug into the board's power jack. Leads from a battery can be
inserted in the Gnd and Vin pin headers of the POWER connector.
The board can operate on an external supply of 6 to 20 volts. If supplied with less
than 7V, however, the 5V pin may supply less than five volts and the board may be
unstable .If using more than 12V, the voltage regulator may overheat and damage the
board. The recommended range is 7 to 12 volts. The Mega2560 differs from all
preceding boards in that it does not use the FTDI USB-to-serial driver chip. Instead,
it features the Atmega8U2 programmed as a USB-to-serial converter.
The power pins are as follows:
● VIN. The input voltage to the Arduino board when it's using an external power source (as
opposed to 5 volts from the USB connection or other regulated power source). You can
supply voltage through this pin, or, if supplying voltage via the power jack, access it through
this pin.
● 5V. The regulated power supply used to power the microcontroller and other components
on the board. This can come either from VIN via an on-board regulator,or be supplied by
USB or another regulated 5V supply.
● 3V3. A 3.3 volt supply generated by the on-board regulator. Maximum current draw is 50
mA.
12. Fig.no.4 Arduino Mega 2560
The Arduino Mega2560 can be powered via the USB connection or with an external power
supply. The power source is selected automatically. External (non-USB) power can come either
from an AC-to-DC adapter (wall-wart) or battery. The adapter can be connected by plugging a
2.1mm center-positive plug into the board's power jack. Leads from a battery can be inserted in
the Gnd and Vin pin headers of the POWER connector. The board can operate on an external
supply of 6 to 20 volts. If supplied with less than 7V, however, the 5V pin may supply less than
five volts and the board may be unstable. If using more than 12V, the voltage regulator may
overheat and damage the board. The recommended range is 7 to 12 volts.
5.2 Wifi Module
ESP8266 is Wi-Fi enabled system on chip (SoC) module developed by Espressif system. It is
mostly used for development of IoT (Internet of Things) embedded applications.
ESP8266 comes with capabilities of
2.4 GHz Wi-Fi (802.11 b/g/n, supporting WPA/WPA2),
general-purpose input/output (16 GPIO),
Inter-Integrated Circuit (I²C) serial communication protocol,
analog-to-digital conversion (10-bit ADC)
Serial Peripheral Interface (SPI) serial communication protocol,
I²S (Inter-IC Sound) interfaces with DMA(Direct Memory Access) (sharing pins with
GPIO),
UART (on dedicated pins, plus a transmit-only UART can be enabled on GPIO2), and
pulse-width modulation (PWM).
13. Fig.no.5 Wifi Module
5.3. Heartbeat Sensor
Heartbeat sensor provides a simple way to study the function of the heart which can be
measured based on the principle of psycho-physiological signal used as a stimulus for the
virtualreality system. The amount of the blood in the finger changes with respect to time. The
sensor shines a light lobe (a small very bright LED) through the ear and measures the light that
gets transmitted to the Light Dependent Resistor. The amplified signal gets inverted and
filtered, in the Circuit. In order to calculate the heart rate based on the blood flow to the
fingertip, a heartrate sensor is assembled with the help of LM358 OP-AMP for monitoring the
heartbeat pulses.
Heartbeat Sensor is an electronic device that is used to measure the heart rate i.e. speed of the
heartbeat. Monitoring body temperature, heart rate and blood pressure are the basic things that
we do in order to keep us healthy.
14. Fig.no.6 Heartbeat Sensor
5.4. ECG
ECG records the electrical activity generated by heart muscle depolarizations, which propagate
in pulsating electrical waves towards the skin. Although the electricity amount is in fact very
small, it can be picked up reliably with ECG electrodes attached to the skin. The full ECG setup
comprises at least four electrodes which are placed on the chest or at the four extremities
according to standard nomenclature (RA = right arm; LA = left arm; RL = right leg; LL = left
leg). Of course, variations of this setup exist to allow more flexible and less intrusive recordings,
for example, by attaching the electrodes to the forearms and legs. ECG electrodes are typically
wet sensors, requiring the use of a conductive gel to increase conductivity between skin and
electrodes.
Fig.no. 7 ECG Sensor
15. This sensor is a cost-effective board used to measure the electrical activity of the heart. This
electrical activity can be charted as an ECG or Electrocardiogram and output as an analog
reading. ECGs can be extremely noisy, the AD8232 Single Lead Heart Rate Monitor acts as
an op amp to help obtain a clear signal from the PR and QT Intervals easily.
The AD8232 is an integrated signal conditioning block for ECG and other biopotential
measurement applications. It is designed to extract, amplify, and filter small biopotential
signals in the presence of noisy conditions, such as those created by motion or remote
electrode placement.The AD8232 module breaks out nine connections from the IC that you
can solder pins, wires, or other connectors to. SDN, LO+, LO-, OUTPUT, 3.3V, GND
provide essential pins for operating this monitor with an Arduino or other development board.
Also provided on this board are RA (Right Arm), LA (Left Arm), and RL (Right Leg) pins to
attach and use your own custom sensors. Additionally, there is an LED indicator light that
will pulsate to the rhythm of a heart beat.
Features:
Operating Voltage - 3.3V
Analog Output
Leads-Off Detection
Shutdown Pin
LED Indicator
3.5mm Jack for Biomedical Pad Connection or Use 3 pin header
Fig.no.8 ECG Module
16. 5.5. Temperature Sensor(DS18B20)
The DS18B20 digital thermometer provides 9-bit to 12-bit Celsius temperature
measurements and has an alarm function with nonvolatile user-programmable upper
and lower trigger points. The DS18B20 communicates over a 1-Wire bus that by
definition requires only one data line (and ground) for communication with a central
microprocessor. In addition, the DS18B20 can derive power directly from the data
line ("parasite power"), eliminating the need for an external power supply.
Each DS18B20 has a unique 64-bit serial code, which allows multiple DS18B20s to
function on the same 1-Wire bus. Thus, it is simple to use one microprocessor to
control many DS18B20s distributed over a large area. Applications that can benefit
from this feature include HVAC environmental controls, temperature monitoring
systems inside buildings, equipment, or machinery, and process monitoring and
control systems.
Key Features
Unique 1-Wire®
Interface Requires Only One Port Pin for Communication
Reduce Component Count with Integrated Temperature Sensor and EEPROM
o Measures Temperatures from -55°C to +125°C (-67°F to +257°F)
o ±0.5°C Accuracy from -10°C to +85°C
o Programmable Resolution from 9 Bits to 12 Bits
o No External Components Required
Parasitic Power Mode Requires Only 2 Pins for Operation (DQ and GND)
Simplifies Distributed Temperature-Sensing Applications with Multidrop Capability
o Each Device Has a Unique 64-Bit Serial Code Stored in On-Board ROM
Flexible User-Definable Nonvolatile (NV) Alarm Settings with Alarm Search
Command Identifies Devices with Temperatures Outside Programmed Limits
Available in 8-Pin SO (150 mils), 8-Pin µSOP, and 3-Pin TO-92 Packages
Fig.no.9 Temperature Sensor
17. Chapter 6
PRACTICAL IMPLEMENTATION
6.1 Circuit Diagram
Fig.no. 10: Circuit Diagram
In this, we have used Arduino mega as microcontroller unit. All the components and modules
are connected as give in a circuit diagram.
For this system we required two types of power supply 5V or 3.3 V because of some
components are operated in 3.3 V. All the sensors, which generates the analog output is
connected to an analog pin of Arduino's analog pins. And Digital sensors
like(Temp.,Humidity) there are connected to digital pins. The Ethernet Shield (HANRUN) is
used in this system for internet connectivity. It can be replaced by GSM or Wi-Fi module
also.
The analog/digital data are processed by Arduino and with the help of internet connectivity all
the monitored data sended to the cloud (Here we have used ThingSpeak).ThingSpeak cloud
provides the MATLAB Visualization or MATLAB Code. By this we can plot graph and
getting desirable data.
18. 6.2 Interfacing ESP8266 With Arduino Mega 2560
Figure 11: ESP interfacing with Arduino
ESP826 can be interfaced with Arduino, although the logic connection between ESP and
Arduino is very simple. ESP-Rx goes to Arduino Tx, ESP-Tx goes to Arduino Rx.
However, all ESP-8266 run on 3.3V, while Arduino pins run on 5V. Before connecting
them, you shall provide a way to adapt these voltages, or you could damage your ESP.
Given below the circuit showing interface between ESP and Arduino.
Following is steps needed to take care while interfacing
• VCC shall be connected to the 3.3V power supply.
• GPIO0 and GPIO2 are general purposes digital ports. GPIO0 also controls the
module mode (programming or normal operation). In our case (normal
operation), it shall be connected to
3.3V (high). We put it on 3.3V to simplify the connections
• CH_PD: Chip enable. Keeping it on high (3.3V) for normal operation
• RST: Reset. Keeping it on high (3.3V) for normal operation. Put it on 0V to reset
the chip.
• Tx: Goes to Arduino Rx
• Rx: Goes to Arduino Tx (But needs a voltage adjusting) and GND is ground
19. 6.3 Cloud computing:
Cloud computing, also known as on-the-line computing, is a kind of Internet-based computing
that provides shared processing resources and data to computers and other devices on
demand. It is a model for enabling ubiquitous, on-demand access to a shared pool of
configurable computing resources (e.g., networks, servers, storage, applications and services),
which can be rapidly provisioned and released with minimal management effort. Cloud
computing and storage solutions provide users and enterprises with various capabilities to
store and process their data in third-party data centers. It relies on sharing of resources to
achieve coherence and economy of scale, similar to a utility (like the electricity grid) over a
network.
Cloud storage:
Cloud storage is a model of data storage in which the digital data is stored in logical pools, the
physical storage spans multiple servers (and often locations), and the physical environment is
typically owned and managed by a hosting company. These cloud storage providers are
responsible for keeping the data available and accessible, and the physical environment
protected and running. People and organizations buy or lease storage capacity from the
providers to store user, organization, or application data.
https://thingspeak.com
Send sensor data to the cloud
ThingSpeak Channel:
Channels store all the data that a ThingSpeak application collects. Each channel includes eight
fields that can hold any type of data, plus three fields for location data and one for status data.
Once we collect data in a channel, we can use ThingSpeak apps to analyze and visualize it.
20. Channel Settings
· Channel Name: Enter a unique name for the ThingSpeak channel.
· Description: Enter a description of the ThingSpeak channel.
· Field#: Check the box to enable the field, and enter a field name. Each ThingSpeak channel
can have up to 8 fields.
· Metadata: Enter information about channel data, including JSON, XML, or CSV data.
· Tags: Enter keywords that identify the channel. Separate tags with commas.
· Latitude: Specify the position of the sensor or thing that collects data in decimal degrees. For
example, the latitude of the city of London is 51.5072.
· Longitude: Specify the position of the sensor or thing that collects data in decimal degrees.
For example, the longitude of the city of London is -0.1275.
· Elevation: Specify the position of the sensor or thing that collects data in meters. For
example, the elevation of the city of London is 35.052.
· Make Public: If you want to make the channel publicly available, check this box.
· URL: If you have a website that contains information about your ThingSpeak channel,
specify the URL.
· Video ID: If you have a YouTube™ or Vimeo® video that displays your channel
information, specify the full path of the video URL.
Using the Channel
We can get data into a channel from a device, website, or another ThingsSpeak channel. You
can then visualize data and transform it using ThingSpeak Apps.
ü Channel detail:-
21. Channel name-Health care system
Channel ID: 125XXX
Author: acd@gmail.com
Access: Private, Public
6.4 Using the Arduino IDE
The Arduino integrated development environment (IDE) is a cross-platform application
written in Java, and is derived from the IDE for the Processing programming language and
the Wiring projects. It is designed to introduce programming to artists and other newcomers
unfamiliar with software development. It includes a code editor with features such as syntax
highlighting, brace matching, and automatic indentation, and is also capable of compiling and
uploading programs to the board with a single click. A program or code written for Arduino is
called a "sketch".
Arduino programs are written in C or C++. The Arduino IDE comes with a software
library called "Wiring" from the original Wiring project, which makes many common
input/output operations much easier. Users only need define two functions to make a run able
cyclic executive program:
Setup(): a function run once at the start of a program that can initialize settings
Loop(): a function called repeatedly until the board powers off.
Open the Arduino IDE software and select the board in use. To select the board:
Go to Tools.
Select Board.
Under board, select the board being used, in this case Arduino Uno.
Go to Tools and to Port and select the port at which the arduino board is connected
22. Fig.no12: Arduino IDE
6.5 Using Thingspeak cloud service
ThingSpeaK is an IoT analytics platform service that allows you to aggregate, visualize and
analyze live data streams in the cloud. ThingSpeak provides instant visualizations of data posted
by your devices to ThingSpeak. With the ability to execute MATLAB® code in ThingSpeak
you can perform online analysis and processing of the data as it comes in. ThingSpeak is often
used for prototyping and proof of concept IoT systems that require analytics.
What is IoT?
Internet of Things (IoT) describes an emerging trend where a large number of embedded
devices (things) are connected to the Internet. These connected devices communicate with
people and other things and often provide sensor data to cloud storage and cloud computing
resources where the data is processed and analyzed to gain important insights. Cheap cloud
computing power and increased device connectivity is enabling this trend.
IoT solutions are built for many vertical applications such as environmental monitoring and
control, health monitoring, vehicle fleet monitoring, industrial monitoring and control, and
home automation.
At a high level, many IoT systems can be described using the diagram below:
23. Fig.no. 13 : IOT & its applications
On the left, we have the smart devices (the “things” in IoT) that live at the edge of the
network. These devices collect data and include things like wearable devices, wireless
temperatures sensors, heart rate monitors, and hydraulic pressure sensors, and machines on
the factory floor.
In the middle, we have the cloud where data from many sources is aggregated and analyzed in
real time, often by an IoT analytics platform designed for this purpose.
The right side of the diagram depicts the algorithm development associated with the IoT
application. Here an engineer or data scientist tries to gain insight into the collected data by
performing historical analysis on the data. In this case, the data is pulled from the IoT platform
into a desktop software environment to enable the engineer or scientist to prototype algorithms
that may eventually execute in the cloud or on the smart device itself.
An IoT system includes all these elements. ThingSpeak fits in the cloud part of the diagram and
provides a platform to quickly collect and analyze data from internet connected sensors.
ThingSpeak Key Features :
ThingSpeak allows you to aggregate, visualize and analyze live data streams in the cloud. Some
of the key capabilities of ThingSpeak include the ability to:
Easily configure devices to send data to ThingSpeak using popular IoT protocols.
Visualize your sensor data in real-time.
Aggregate data on-demand from third-party sources.
Use the power of MATLAB to make sense of your IoT data.
Run your IoT analytics automatically based on schedules or events.
Prototype and build IoT systems without setting up servers or developing web
software.
Automatically act on your data and communicate using third-party services like
Twilio® or Twitter®.
24. 6.6 CODE
#include <OneWire.h>
#include <DallasTemperature.h>
// #define NDEBUG
#define ONE_WIRE_BUS 2
#define PULSE_PIN A0
#define ECG_PIN A1
#define BLINK_PIN 13
#define ECG1 10
#define ECG2 11
#define ESP_RESET 12
// Volatile Variables, used in the interrupt service routine!
int blinkPin = 13; // pin to blink led at each beat
volatile int BPM; // int that holds raw Analog in 0. updated every 2mS
volatile int Signal; // holds the incoming raw data
volatile int IBI = 600; // int that holds the time interval between beats! Must be
seeded!
volatile boolean Pulse = false; // "True" when User's live heartbeat is detected. "False"
when not a "live beat".
volatile boolean QS = false; // becomes true when Arduoino finds a beat.
static boolean serialVisual = true; // Set to 'false' by Default. Re-set to 'true' to see Arduino
Serial Monitor ASCII Visual Pulse
25. volatile int rate[10]; // array to hold last ten IBI values
volatile unsigned long sampleCounter = 0; // used to determine pulse timing
volatile unsigned long lastBeatTime = 0; // used to find IBI
volatile int P = 512; // used to find peak in pulse wave, seeded
volatile int T = 512; // used to find trough in pulse wave, seeded
volatile int thresh = 525; // used to find instant moment of heart beat, seeded
volatile int amp = 100; // used to hold amplitude of pulse waveform, seeded
volatile boolean firstBeat = true; // used to seed rate array so we startup with reasonable
BPM
volatile boolean secondBeat = false; // used to seed rate array so we startup with
reasonable BPM
OneWire one_wire( ONE_WIRE_BUS );
DallasTemperature sensors( &one_wire );
typedef enum Mode_
{
MODE_NONE = 0,
MODE_ECG = 1,
MODE_TEMP = 2,
MODE_BPM = 3,
MODE_TEMP_BPM = 4
} Mode_t;
int selected_mode = MODE_NONE;
boolean transmission_mode = true;
26. /* protos :) */
int getBPM();
void transmit( int bpm, int temperature );
double getECG();
double getTemperature();
void setup()
{
Serial.begin( 115200 );
Serial1.begin( 115200 );
pinMode( ECG1, INPUT );
pinMode( ECG2, INPUT );
sensors.begin();
Serial.println( "Resetting ESP..." );
pinMode( ESP_RESET, OUTPUT );
delay( 2000 );
Serial.println( "Waiting for ESP connectivity..." );
while ( 1 )
{
while ( Serial1.available() > 0 ) Serial1.read();
Serial1.print( 'r' );
27. delay( 50 );
if ( Serial1.read() != 'r' )
{
Serial.print( "." );
delay( 2000 );
continue;
}
else break;
}
Serial.println();
Serial.println( "ESP ready OK." );
interruptSetup(); // sets up to read Pulse Sensor signal every 2mS
// analogReference(EXTERNAL);
}
void loop()
{
if ( Serial.available() > 0 )
{
String mode = Serial.readString();
if ( mode.indexOf("temp") != -1 )
selected_mode = MODE_TEMP;
else if ( mode.indexOf("ecg") != -1 )
{
selected_mode = MODE_ECG;
Serial.println( "ECG mode. You can change this mode at any time. " );
33. }
Serial.print( "Waiting for confirmation from ESP..." );
Serial.print( "." );
Serial.println();
Serial.println( "ESP confirmed receipt." );
while ( Serial1.available() > 0 ) Serial1.read();
}
int getBPM()
{
serialOutput();
if (QS == true) // A Heartbeat Was Found
{
// BPM and IBI have been Determined
// Quantified Self "QS" true when arduino finds a heartbeat
QS = false; // reset the Quantified Self flag for next time
}
delay(20); // take a break
return BPM;
}
void interruptSetup()
{
// Initializes Timer2 to throw an interrupt every 2mS.
TCCR2A = 0x02; // DISABLE PWM ON DIGITAL PINS 3 AND 11, AND GO INTO
CTC MODE
34. TCCR2B = 0x06; // DON'T FORCE COMPARE, 256 PRESCALER
OCR2A = 0X7C; // SET THE TOP OF THE COUNT TO 124 FOR 500Hz SAMPLE
RATE
TIMSK2 = 0x02; // ENABLE INTERRUPT ON MATCH BETWEEN TIMER2 AND
OCR2A
sei(); // MAKE SURE GLOBAL INTERRUPTS ARE ENABLED
}
void serialOutputWhenBeatHappens()
{
if (serialVisual == true) // Code to Make the Serial Monitor Visualizer Work
{
Serial.print(" Heart-Beat Found "); //ASCII Art Madness
Serial.print("BPM: ");
Serial.println(BPM);
}
else
{
sendDataToSerial('B',BPM); // send heart rate with a 'B' prefix
sendDataToSerial('Q',IBI); // send time between beats with a 'Q' prefix
}
}
void arduinoSerialMonitorVisual(char symbol, int data )
{
const int sensorMin = 0; // sensor minimum, discovered through experiment
const int sensorMax = 1024; // sensor maximum, discovered through experiment
int sensorReading = data; // map the sensor range to a range of 12 options:
int range = map(sensorReading, sensorMin, sensorMax, 0, 11);
// do something different depending on the
35. // range value:
}
void sendDataToSerial(char symbol, int data )
{
Serial.print(symbol);
Serial.println(data);
}
{
cli(); // disable interrupts while we do this
Signal = analogRead(PULSE_PIN); // read the Pulse Sensor
sampleCounter += 2; // keep track of the time in mS with this variable
int N = sampleCounter - lastBeatTime; // monitor the time since the last beat to avoid
noise
// find the peak and trough of the pulse wave
if(Signal < thresh && N > (IBI/5)*3) // avoid dichrotic noise by waiting 3/5 of last IBI
{
if (Signal < T) // T is the trough
{
T = Signal; // keep track of lowest point in pulse wave
}
}
if(Signal > thresh && Signal > P)
{ // thresh condition helps avoid noise
P = Signal; // P is the peak
} // keep track of highest point in pulse wave
36. // NOW IT'S TIME TO LOOK FOR THE HEART BEAT
// signal surges up in value every time there is a pulse
if (N > 250)
{ // avoid high frequency noise
if ( (Signal > thresh) && (Pulse == false) && (N > (IBI/5)*3) )
{
Pulse = true; // set the Pulse flag when we think there is a pulse
digitalWrite(blinkPin,HIGH); // turn on pin 13 LED
IBI = sampleCounter - lastBeatTime; // measure time between beats in mS
lastBeatTime = sampleCounter; // keep track of time for next pulse
if(secondBeat)
{ // if this is the second beat, if secondBeat == TRUE
secondBeat = false; // clear secondBeat flag
for(int i=0; i<=9; i++) // seed the running total to get a realisitic BPM at startup
{
rate[i] = IBI;
}
}
if(firstBeat) // if it's the first time we found a beat, if firstBeat == TRUE
{
firstBeat = false; // clear firstBeat flag
secondBeat = true; // set the second beat flag
sei(); // enable interrupts again
return; // IBI value is unreliable so discard it
}
// keep a running total of the last 10 IBI values
37. word runningTotal = 0; // clear the runningTotal variable
for(int i=0; i<=8; i++)
{ // shift data in the rate array
rate[i] = rate[i+1]; // and drop the oldest IBI value
runningTotal += rate[i]; // add up the 9 oldest IBI values
}
rate[9] = IBI; // add the latest IBI to the rate array
// add the latest IBI to runningTotal
runningTotal /= 10; // average the last 10 IBI values
BPM = (60000/runningTotal)/4; // how many beats can fit into a minute? that's
BPM!
QS = true; // set Quantified Self flag
// QS FLAG IS NOT CLEARED INSIDE THIS ISR
}
}
if (Signal < thresh && Pulse == true)
{ // when the values are going down, the beat is over
digitalWrite(blinkPin,LOW); // turn off pin 13 LED
Pulse = false; // reset the Pulse flag so we can do it again
amp = P - T; // get amplitude of the pulse wave
thresh = amp/2 + T; // set thresh at 50% of the amplitude
P = thresh; // reset these for next time
T = thresh;
}
if (N > 2500)
{ // if 2.5 seconds go by without a beat
38. thresh = 512; // set thresh default
P = 512; // set P default
T = 512; // set T default
lastBeatTime = sampleCounter; // bring the lastBeatTime up to date
firstBeat = true; // set these to avoid noise
secondBeat = false; // when we get the heartbeat back
}
sei(); // enable interrupts when youre done!
}// end isr
double getECG()
{
int ecg;
if ( (digitalRead(ECG1) == 1 ) || digitalRead(ECG2) == 1 )
Serial.println( "!" );
else
{
ecg = analogRead( ECG_PIN );
Serial.println( ecg );
}
delay(1);
}
double getTemperature()
{
return sensors.getTempFByIndex( 0 );
}
39. Chapter 7
RESULTS & DISCUSSIONS
This system can be used to transmit the patient vital parameter information in real-time to
remote location and can be seen by the care taker. The sensors are connected to the Arduino
Mega board. The sensed values are transmitted wirelessly to the Arduino board receiver which
is connected to the central station personal computer. The captured data can be seen over the
ThingSpeak Cloud service using a unique username and password. The following are some
results from the system.
Fig.no : 14 : Result 1
Fig.no. : 15: Result 2
41. Chapter 8
CONCLUSION AND FUTURE ENHANCEMENTS
With the development in the integrated circuit industry, Micro Electro Mechanical Systems
(MEMs) and microcontrollers have become affordable, have increased processing speeds,
miniaturized and power efficient. This has led to increased development of embedded systems
that the healthcare specialists are adopting. These embedded systems have also been adopted in
the Smartphone technology. And with increased internet penetration in most developing
countries through mobile phones, and with use of Internet of things (IoT) will become adopted
at a faster rate.
The Patient Health Care system utilizes these concepts to come up with a system for better
quality of life for people in society. From an engineering perspective, the project has seen
concepts acquired through the computer science and embedded study period being practically
applied. The Electric circuit analysis knowledge was used during design and fabrication of the
individual modules. Electromagnetic fields analysis used in the wireless transmission between
microcontrollers and Software programming used during programming of the microcontrollers
to come up with a final finished circuit system.
The whole health monitoring system, which we have proposed can be integrated into a small
compact unit as small as a cell phone or a wrist watch. This will help the patients to easily carry
this device with them wherever they go. The VLSI technologies will greatly come handy in this
regard.
In this paper, tele-monitoring application is presented which allows the doctor to view the
patient’s vital parameters remotely and dynamically in a Web page in real time and doesn’t
need to have any special requirement on the PC; all he needs is an Internet access.
For the patient side, a home based Arduino IDE application which is embedded in home PC is
required. In future this work can be extended by adding the Blood pressure sensors to the
existing set-up. This work is done based on single person’s data collection and in future this
can be extended to multiple people.
42. Chapter 9
REFERENCES
PAPERS & JOURNALS
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43. WEBSITES
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