IOT: HEART MONITORING SENSOR

Corona virus (Covid 19) is spreading all around the world. Many lives have been at risk due to this pandemic. Most of the family members could not even reach their home. How about if you could take care of your family remotely ? How about if you could get your distant family member's health statistics from remote location and call for help in emergencies. This project explains how heart beat of a person can be received over a smartphone.

Circuit diagram:

Code:

#include <ESP8266WiFi.h> #include <Servo.h> Servo servo; //Static IP address configuration IPAddress staticIP(192, 168, 225, 81); //ESP static ip IPAddress gateway(192, 168, 225, 1); //IP Address of your WiFi Router (Gateway) IPAddress subnet(255, 255, 255, 0); //Subnet mask //Define wifi configuration const char* ssid = "YOUR_SSID"; const char* password = "YOUR_WIFI_PASSWORD"; // Create an instance of the server WiFiServer server(80); void setup() { Serial.begin(9600); // prepare GPIO 4 servo.attach(4); //Motor in home position servo.write(90); servo.detach(); delay(100); // Connect to WiFi network Serial.println(); Serial.println(); Serial.print("Connecting to "); Serial.println(ssid); WiFi.begin(ssid, password); //Configuring Static IP WiFi.config(staticIP,gateway,subnet); while (WiFi.status() != WL_CONNECTED) { delay(500); Serial.print("."); } Serial.println(""); Serial.println("WiFi connected"); // Start the server server.begin(); Serial.println("Server started"); // Print the IP address Serial.println(WiFi.localIP()); } void loop() { // Check if a client has connected WiFiClient client = server.available(); if (!client) { return; } // Wait until the client sends some data // Serial.println("new client"); while(!client.available()){ delay(1); } // Read the first line of the request String req = client.readStringUntil('\r'); //Serial.println(req); //Serial.println("req"); client.flush(); // Match the request int val; Int reading = 0; Int threshold = 550; if (req.indexOf("/gpio/0") != -1) val = 0; else if (req.indexOf("/gpio/1") != -1) val = 1; else if(req.indexOf("CHECK_PULSE") != -1) { reading = analogRead(0); if(reading > threshold) client.println(“BP high”) Else client.println(“BP low”) } // else if(req.indexOf("OFF1") != -1) // { // digitalWrite(D0, HIGH); // } else { client.stop(); return; } client.flush(); // Prepare the response String s = "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n<!DOCTYPE HTML>\r\n<html>\r\nGPIO is now "; s += (val)?"high":"low"; s += "</html>\n"; // Send the response to the client //client.print(s); delay(1); Serial.println("Client disconnected"); // The client will actually be disconnected // when the function returns and 'client' object is destroyed }

DESCRIPTION:

ARDUINO SETTINGS:

Most of the code is commented. Some of the important points to highlight
In the code we need to change the gateway according to our network.
Simple method - (For windows)
Open command prompt - type “ipconfig”
Look for “default gateway”. A set of four numbers will be displayed. In my case its 192.168.xxx.1
Note this “xxx” number, goto line in the code where “staticIP” is defined and replace the 3rd number with this number you just found.
Ex: default gateway is 192. 169. 255 .1
So in my code -
IPAddress staticIP (192, 168, 225, 81); //ESP static ip
IPAddress gateway (192, 168, 225, 1);

Next step is changing SSID and password
Replace YOUR_SSID in this line - const char* ssid = "YOUR_SSID" with your wifi name.
Replace YOUR_WIFI_PASSWORD in the line const char* password = "YOUR_WIFI_PASSWORD"; with your wifi password.

ANDROID APP SETTINGS:

To test the project , open the android app “LINK HERE” , type IP address of the device and same gateway .
Now type “CHECK_PULSE” keyword into “send” section and hit send.
In the receive section of the app you will be able to see the response from the arduino device.

TECH KEEDA

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IOT: HEART MONITORING SENSOR