MAX30100 with Arduino and 16x2 Display

Monitor heart rate and oxygen levels using the MAX30100 sensor with Arduino and display real-time data on a 16x2 LCD screen.

BeginnerFull instructions provided7 hours984

Things used in this project

Hardware components

Arduino UNO

max30100 pulse oximeter sensor

Adafruit RGB Backlight LCD - 16x2

connecting wires

Software apps and online services

Arduino IDE

Story

This project aims to build a compact, DIY heart rate and oxygen saturation monitor using the MAX30100 sensor, an Arduino, and a 16x2 LCD. The MAX30100 is a pulse oximeter and heart-rate sensor, which works by shining infrared and red light through the skin to detect changes in blood oxygen levels and heartbeats.

How It Works

MAX30100 Sensor: The sensor uses light absorption to measure blood oxygen levels (SpO2) and heart rate (BPM). When placed on the user’s fingertip, it detects variations in light absorption as blood pulses through the veins.
Arduino: The Arduino reads data from the MAX30100 sensor, processes the signals, and calculates heart rate and SpO2 values.
LCD Display: The 16x2 display shows the calculated values in real-time. The heart rate is shown in beats per minute (BPM) and oxygen saturation as a percentage (SpO2).

Application :

This MAX30100-based project has practical applications in health monitoring. It can be used to track heart rate and blood oxygen levels (SpO2) in real time, making it a valuable tool for athletes, individuals with respiratory or heart conditions, or anyone interested in keeping an eye on their vital signs. The compact, portable design makes it easy to use at home, in fitness settings, or on the go. It’s also useful for educational purposes, demonstrating how pulse oximeters work and offering insights into bio-signal processing with accessible technology like Arduino.

Code

code for this project

#include <LiquidCrystal_I2C.h>
#include "MAX30100_PulseOximeter.h"
 
// Create the lcd object address 0x27 and 16 columns x 2 rows 
LiquidCrystal_I2C lcd (0x27, 16,2); //we can find the address through I2C address scanner
 
#define REPORTING_PERIOD_MS     1000
 
PulseOximeter pox;
uint32_t tsLastReport = 0;
 
void onBeatDetected()
{
    Serial.println("Beat!");
}
 
void setup()
{
    Serial.begin(115200);
    Serial.print("Initializing pulse oximeter..");
    lcd.init ();
    lcd. backlight ();
    lcd.print("Initializing...");
    delay(3000);
    lcd.clear();
 
    // Initialize the PulseOximeter instance
    // Failures are generally due to an improper wiring, missing power supply
    if (!pox.begin()) {
        Serial.println("FAILED");
        for(;;);
    } else {
        Serial.println("SUCCESS");
    }
     pox.setIRLedCurrent(MAX30100_LED_CURR_7_6MA);
 
    // Register a callback for the beat detection
    pox.setOnBeatDetectedCallback(onBeatDetected);
}
 
void loop()
{
    // Make sure to call update as fast as possible
    pox.update();
    if (millis() - tsLastReport > REPORTING_PERIOD_MS) {
        Serial.print("Heart rate:");
        Serial.print(pox.getHeartRate());
        Serial.print("bpm / SpO2:");
        Serial.print(pox.getSpO2());
        Serial.println("%");
 
        lcd.clear();
        lcd.setCursor(0,0);
        lcd.print("BPM : ");
        lcd.print(pox.getHeartRate());
        
        lcd.setCursor(0,1);
        lcd.print("SpO2: ");
        lcd.print(pox.getSpO2());
        lcd.print("%");
 
        tsLastReport = millis();
    }
}