AarogyaCode.ino

#include <Wire.h>
#include "MAX30105.h"
#include <ESP8266WiFi.h>
#include "ThingSpeak.h"
#include "heartRate.h"

const char* ssid = "INDIVIDUALs_SSID";   
const char* password = "PASSWORD OF SSID";

WiFiClient client;

unsigned long myChannelNumber = 1;
const char * myWriteAPIKey = "API_KEY";

MAX30105 particleSensor;

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;

void setup()
{
  Serial.begin(115200);
  WiFi.begin(ssid,password);

  Serial.println("Initializing...");
  
    while(WiFi.status() != WL_CONNECTED)
    {
     Serial.print(".");
      delay(500);
    }
    Serial.println("\nConnected.");
    WiFi.mode(WIFI_STA);
    ThingSpeak.begin(client);  // Initialize ThingSpeak

  // Initialize sensor
  if (!particleSensor.begin(Wire, I2C_SPEED_FAST)) //Use default I2C port, 400kHz speed
  {
    Serial.println("MAX30105 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);

  int x = ThingSpeak.writeField(myChannelNumber, 1, beatsPerMinute, myWriteAPIKey);
  if(x == 200)
  {
    Serial.println("Channel update successful.");
  }
  else
  {
    Serial.println("Problem updating channel. HTTP error code " + String(x));
  }
  if (irValue < 50000)
    Serial.print(" No finger?");
  Serial.println();
}