Sharvayu Chavan, Pratham Bumb, jangadashrenik

Published July 27, 2020

Covid19 Health Monitoring System

A wearable that helps and protects doctors!

IntermediateShowcase (no instructions)3,202

Things used in this project

Hardware components

Maxim Integrated MAX30102 High-Sensitivity Pulse Oximeter and Heart-Rate Sensor for Wearable Health

NodeMCU ESP8266 Breakout Board

DFRobot Gravity: Analog LM35 Temperature Sensor For Arduino

Hand tools and fabrication machines

Premium Female/Male Extension Jumper Wires, 40 x 6" (150mm)

Story

Where we started

The world is currently in a very unusual dilemma known as the novel Covid 19 pandemic. With over 10 million Covid 19 cases around the world, one of the most challenging jobs is those of doctors. As a team, we wanted to help protect these doctors. The basic idea we had in our minds was finding a way to reduce physical contact between the doctors and patients because Covid 19 can spread quickly in this manner. After some research anda few failed ideas, we found out that doctors constantly check asymptomatic patient's temperature and heart rate. Both of these include some form of physical contact, and thus we found a somewhat small but significant problem the doctors face. Along with this, a machine that detects and presents this data could be very useful when there is a shortage of medical personnel.

How we wanted to solve it

In simple terms, we wanted to find a way doctors could measure any patient's temperature and heart rate without any form of physical contact. Our first instinct was to use the Internet of Things(IoT). We wanted to get the data from our sensors and send it to a server where it would display the data. With some more research, we found two sensors that could measure the temperature and the heart rate of a user. They were the LM35 temperature and MAX30102 heart rate sensors. To give it WiFi capabilities, we decided to use the ESP8266 NodeMCU and the MQTT protocol to send the data from our microcontroller to the server. Now that we had a plan, we wanted to assign jobs to everyone, and this project had enough content for everyone to contribute a fair share of their thinking. There were three jobs, the software, the hardware, and the code for the server. After assembling the hardware, we moved on to the coding part, which was the most interesting yet most frustrating part of our project. We got the code to work with lots of trial and error.

Fully assembled hardware

How it works

Applications of the longtime monitoring device were limited but significant. A Covid 19 patient could wear this device for as long as the doctors would need him or her to. The temperature and heart rate of the patient gets recorded every 30 seconds and will go to our server where they will be added to a graph. Doctors will be able to see the growth or decrease of a certain patient's temperature and heart rate with less of a threat of catching the virus in the process. This project could be enhanced with blood oxygen saturation(SpO2) measurement capabilities. Low SpO2 could show sleep apnea, breathing problems, and other unhealthy symptoms of Covid 19, which could help many people. It could also be further revamped with a notification system that could alert the user if his or her temperature, heart rate, or SpO2 is dangerously high or low. This device will also reduce the number of personnel needed, which could potentially protect more lives.

Output of our data

The final part of the project

After we got our device to successfully work, we approached the final step: the looks. We wanted the device to look appealing to the eye. We made our own case and designed the outside.

The device after completion

This was a very enlightening and extraordinary experience for all of us, and we learned plenty from our failed and successful attempts.

Thank you for reading this,

Sharvayu Chavan, Pratham Bumb, and Shrenik Jangada.

Code

Covid19 Watch Code

#include <ESP8266WiFi.h>
#include <Wire.h>
#include <Ticker.h>
#include "PubSubClient.h"
#include "MAX30105.h"
#include "heartRate.h"

#define wifi_ssid "******"
#define wifi_password "***********"
#define mqtt_server "******" //"m23.cloudmqtt.com"
#define mqttUser "*******"//"nrxyvxfh"
#define mqttPassword "******"//"pBqLKJYPlGiV"

MAX30105 particleSensor;
Ticker blinker;
char data[50];
float temperature;

const byte RATE_SIZE = 4; //Increase this for more averaging. 4 is good.
byte rates[RATE_SIZE]; //Array of heart rates
byte rateSpot = 0;
long lastBeat = 0; //Time at which the last beat occurred
float beatsPerMinute;
int beatAvg;
float vref = 3.3;
float resolution = vref / 1023;


WiFiClient espClient;
PubSubClient client(espClient);


void setup()
{
  Serial.begin(115200);
  blinker.attach(30, changeState);
  Serial.println("Initializing...");
  WiFi.begin(wifi_ssid, wifi_password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.println("Connecting to WiFi..");
  }
  Serial.println("Connected to the WiFi network");

  client.setServer(mqtt_server, 8883);

  while (!client.connected()) {
    Serial.println("Connecting to MQTT...");

    if (client.connect("ESP8266Client", mqttUser, mqttPassword )) {

      Serial.println("connected");

    } else {

      Serial.print("failed with state ");
      Serial.print(client.state());
      delay(2000);

    }

    // Initialize sensor
    if (!particleSensor.begin(Wire, I2C_SPEED_FAST)) //Use default I2C port, 400kHz speed
    {
      Serial.println("MAX30102 was not found. Please check wiring/power. ");
      while (1);
    }
    Serial.println("Place your index finger on the sensor with steady pressure.");

    particleSensor.setup(); //Configure sensor with default settings
    particleSensor.setPulseAmplitudeRed(0x0A); //Turn Red LED to low to indicate sensor is running
    particleSensor.setPulseAmplitudeGreen(0); //Turn off Green LED
  }
}

void loop()
{
  long irValue = particleSensor.getIR();

  if (checkForBeat(irValue) == true)
  {
    //We sensed a beat!
    long delta = millis() - lastBeat;
    lastBeat = millis();

    beatsPerMinute = 60 / (delta / 1000.0);

    if (beatsPerMinute < 255 && beatsPerMinute > 20)
    {
      rates[rateSpot++] = (byte)beatsPerMinute; //Store this reading in the array
      rateSpot %= RATE_SIZE; //Wrap variable

      //Take average of readings
      beatAvg = 0;
      for (byte x = 0 ; x < RATE_SIZE ; x++)
        beatAvg += rates[x];
      beatAvg /= RATE_SIZE;
    }

  }

  // Serial.print("IR=");
  //Serial.print(irValue);
  //Serial.print(", BPM=");
  //Serial.print(beatsPerMinute);
  //Serial.print(", Avg BPM=");
  //Serial.print(beatAvg);

  temperature = analogRead(A0);
  temperature = (temperature * resolution);
  temperature = temperature * 100;
  //temperature = (1.8 * temperature) + 32;
  //Serial.print(", Avg Temperature =");
  // Serial.print(temperature);


  if (irValue < 50000)
    Serial.print(" No finger?");

  // Serial.println();
}

void changeState()
{
  Serial.println("500  Done");
  sprintf(data, "%f,%f", beatsPerMinute, temperature);
  Serial.print(data);
  client.publish("BPM/Temperature", data);


}

Covid19 Health Monitoring System

Things used in this project

Hardware components

Hand tools and fabrication machines

Story

Schematics

Covid19 Watch Schematic

Code

Covid19 Watch Code

Credits

Sharvayu Chavan

Pratham Bumb

jangadashrenik

Comments

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Covid19 Health Monitoring System

Covid19 Health Monitoring System

Things used in this project

Hardware components

Hand tools and fabrication machines

Story

Schematics

Covid19 Watch Schematic

Code

Covid19 Watch Code

Credits

Sharvayu Chavan

Pratham Bumb

jangadashrenik

Comments

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