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হার্টবিট মনিটর (MAX30102 + OLED)Heartbeat Sensor with Arduino (MAX30102)

MAX30102 আঙুলে লাল ও infrared আলো ফেলে, প্রতিটা হৃদস্পন্দনে আলো কাঁপে। checkForBeat() প্রতিটা স্পন্দন ধরে, দুই স্পন্দনের ফাঁক থেকে BPM বের করে — শেষ চারটার গড় দেখায়।

The MAX30102 shines red and infrared light into a fingertip and watches it flicker with each heartbeat. checkForBeat() spots each flicker; the gap between two beats gives the BPM, averaged over the last four.

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সার্কিট ডায়াগ্রাম · Circuit diagram

Heartbeat Sensor with Arduino (MAX30102) circuit diagram — Arduino Uno, Heart rate & SpO2 sensor (MAX30102), OLED display 0.96" (SSD1306), Jumper wires

যা যা লাগবে · Parts you need

তার লাগানো · Wiring

Heart rate & SpO2 sensor (MAX30102) VIN→Arduino Uno 5V
Heart rate & SpO2 sensor (MAX30102) GND→Arduino Uno GND
Heart rate & SpO2 sensor (MAX30102) SDA→Arduino Uno A4
Heart rate & SpO2 sensor (MAX30102) SCL→Arduino Uno A5
OLED display 0.96" (SSD1306) VCC→Arduino Uno 5V
OLED display 0.96" (SSD1306) GND→Arduino Uno GND
OLED display 0.96" (SSD1306) SDA→Arduino Uno A4
OLED display 0.96" (SSD1306) SCL→Arduino Uno A5

Code (Arduino C++)

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include "MAX30105.h"
#include "heartRate.h"

// Heartbeat monitor: the MAX30102 shines red + infrared light into a fingertip and
// watches it flicker with each beat. checkForBeat() spots the flicker; the gap
// between two beats gives the BPM. Tap the sensor to put a finger on it.
Adafruit_SSD1306 display(128, 64, &Wire, -1);
MAX30105 particleSensor;
const byte RATE_SIZE = 4;
byte rates[RATE_SIZE];
byte rateSpot = 0;
long lastBeat = 0;
float beatsPerMinute;
int beatAvg;
long nextDraw = 0;

void setup() {
  Serial.begin(115200);
  if (!particleSensor.begin(Wire, I2C_SPEED_FAST)) { Serial.println("MAX30102 not found"); while (1); }
  particleSensor.setup();
  particleSensor.setPulseAmplitudeRed(0x0A);
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display.clearDisplay();
  display.setTextSize(2);
  display.setTextColor(SSD1306_WHITE);
}

void loop() {
  long irValue = particleSensor.getIR();
  if (checkForBeat(irValue)) {
    long delta = millis() - lastBeat;
    lastBeat = millis();
    beatsPerMinute = 60 / (delta / 1000.0);
    if (beatsPerMinute > 20 && beatsPerMinute < 255) {
      rates[rateSpot++] = (byte)beatsPerMinute;
      rateSpot %= RATE_SIZE;
      beatAvg = 0;
      for (byte x = 0; x < RATE_SIZE; x++) beatAvg += rates[x];
      beatAvg /= RATE_SIZE;
    }
    Serial.print("BPM="); Serial.print(beatsPerMinute, 0);
    Serial.print(" Avg="); Serial.println(beatAvg);
  }
  if (millis() > nextDraw) {          // redraw the OLED 2x a second, not on every loop
    nextDraw = millis() + 500;
    display.clearDisplay();
    display.setCursor(0, 0);
    display.print("BPM:");
    display.println(beatAvg);
    display.setCursor(0, 32);
    display.print(irValue > 50000 ? "finger OK" : "no finger");
    display.display();
  }
}

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