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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();

  }

}


Comments

  1. UnknownAugust 9, 2021 at 7:37 AM

    Hi, I followed the steps that you show, however i cannot obtain the connection of esp8266 with blynk, just the lcd can show the reading, can you give me some guidance, thank you so much

    ReplyDelete
    Replies
    1. HD IMAGESSeptember 10, 2021 at 11:10 PM

      ->Check Whether The ESP8266 Is Connected To Your Wi-Fi, In Wi-Fi
      Configuration Page.
      ->Check Whether The SSID And Password Is Coded Correct.
      ->Check Whether The Authentication Code Sent From Blynk Is Pasted Correct
      In Your Code.
      ->Check In Serial Monitor Whether The Blynk Is Connected With IP Address.
      ->Don't Limit The Number Of Connected Device In Our Wi-Fi.

      And Finally Hope You Can Connect Blynk With ESP8266!

      Delete
  2. NaolNovember 2, 2023 at 11:25 PM

    Help us by work the project app with new updated app

    ReplyDelete

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