IOT Based Heart Rate And SpO2 Tracker With NodeMCU MAX30100 And Blynk Application With Code Diagram

Circuit Diagram:
SCL PIN - D1 , SDA PIN - D2 , INT PIN - D0

Code:

#include <Wire.h>

#include "MAX30100_PulseOximeter.h"

#define BLYNK_PRINT Serial

#include <Blynk.h>

#include <ESP8266WiFi.h>

#include <BlynkSimpleEsp8266.h>

#include "Adafruit_GFX.h"

#include "OakOLED.h"

#define REPORTING_PERIOD_MS 1000

OakOLED oled;

char auth[] = "*********************";             // Authentication Token Sent by Blynk

char ssid[] = "********************";        //WiFi SSID

char pass[] = "*********************";        //WiFi Password

// Connections : SCL PIN - D1 , SDA PIN - D2 , INT PIN - D0

PulseOximeter pox;

float BPM, SpO2;

uint32_t tsLastReport = 0;

const unsigned char bitmap [] PROGMEM =

{

  0x00, 0x00, 0x00, 0x00, 0x01, 0x80, 0x18, 0x00, 0x0f, 0xe0, 0x7f, 0x00, 0x3f, 0xf9, 0xff, 0xc0,

  0x7f, 0xf9, 0xff, 0xc0, 0x7f, 0xff, 0xff, 0xe0, 0x7f, 0xff, 0xff, 0xe0, 0xff, 0xff, 0xff, 0xf0,

  0xff, 0xf7, 0xff, 0xf0, 0xff, 0xe7, 0xff, 0xf0, 0xff, 0xe7, 0xff, 0xf0, 0x7f, 0xdb, 0xff, 0xe0,

  0x7f, 0x9b, 0xff, 0xe0, 0x00, 0x3b, 0xc0, 0x00, 0x3f, 0xf9, 0x9f, 0xc0, 0x3f, 0xfd, 0xbf, 0xc0,

  0x1f, 0xfd, 0xbf, 0x80, 0x0f, 0xfd, 0x7f, 0x00, 0x07, 0xfe, 0x7e, 0x00, 0x03, 0xfe, 0xfc, 0x00,

  0x01, 0xff, 0xf8, 0x00, 0x00, 0xff, 0xf0, 0x00, 0x00, 0x7f, 0xe0, 0x00, 0x00, 0x3f, 0xc0, 0x00,

  0x00, 0x0f, 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00

};

void onBeatDetected()

{

  Serial.println("Beat Detected!");

  oled.drawBitmap( 60, 20, bitmap, 28, 28, 1);

  oled.display();

}

void setup()

{

  Serial.begin(115200);

  oled.begin();

  oled.clearDisplay();

  oled.setTextSize(1);

  oled.setTextColor(1);

  oled.setCursor(0, 0);

  oled.println("Initializing pulse oximeter..");

  oled.display();

  pinMode(16, OUTPUT);

  Blynk.begin(auth, ssid, pass);

  Serial.print("Initializing Pulse Oximeter..");

  if (!pox.begin())

  {

    Serial.println("FAILED");

    oled.clearDisplay();

    oled.setTextSize(1);

    oled.setTextColor(1);

    oled.setCursor(0, 0);

    oled.println("FAILED");

    oled.display();

    for (;;);

  }

  else

  {

    oled.clearDisplay();

    oled.setTextSize(1);

    oled.setTextColor(1);

    oled.setCursor(0, 0);

    oled.println("SUCCESS");

    oled.display();

    Serial.println("SUCCESS");

    pox.setOnBeatDetectedCallback(onBeatDetected);

  }

  // The default current for the IR LED is 50mA and it could be changed by uncommenting the following line.

  //pox.setIRLedCurrent(MAX30100_LED_CURR_7_6MA);

}

void loop()

{

  pox.update();

  Blynk.run();

  BPM = pox.getHeartRate();

  SpO2 = pox.getSpO2();

      if (millis() - tsLastReport > REPORTING_PERIOD_MS)

  {

    Serial.print("Heart rate:");

    Serial.print(BPM);

    Serial.print(" SpO2:");

    Serial.print(SpO2);

    Serial.println(" %");

    Blynk.virtualWrite(V1, BPM);

    Blynk.virtualWrite(V2, SpO2);

    

    oled.clearDisplay();

    oled.setTextSize(1);

    oled.setTextColor(1);

    oled.setCursor(0, 16);

    oled.println(pox.getHeartRate());

    oled.setTextSize(1);

    oled.setTextColor(1);

    oled.setCursor(0, 0);

    oled.println("Heart BPM");

    oled.setTextSize(1);

    oled.setTextColor(1);

    oled.setCursor(0, 30);

    oled.println("Spo2");

    oled.setTextSize(1);

    oled.setTextColor(1);

    oled.setCursor(0, 45);

    oled.println(pox.getSpO2());

    oled.display();

    tsLastReport = millis();

  }

}