Đo nhịp tim và hiển thị trên OLED

// Crated by Nguyen Sum,
// https://nguyensumiot.wordpress.com/
// http://nguyensum.simplesite.com/

#include "MAX30100_PulseOximeter.h"
#include "SH1106.h"

#define REPORTING_PERIOD_MS 1000

// PulseOximeter is the higher level interface to the sensor
// it offers:
// * beat detection reporting
// * heart rate calculation
// * SpO2 (oxidation level) calculation
PulseOximeter pox;



SH1106 display(0x3c, 4, 5);

uint32_t tsLastReport = 0;

// Callback (registered below) fired when a pulse is detected
void onBeatDetected()
{
Serial.println("Beat!");
}

void setup()
{
Serial.begin(115200);

// Initialize the PulseOximeter instance and register a beat-detected callback
pox.begin();
pox.setOnBeatDetectedCallback(onBeatDetected);
display.init();

display.setFont(ArialMT_Plain_16);
}

void loop()
{
// Make sure to call update as fast as possible
pox.update();

// Asynchronously dump heart rate and oxidation levels to the serial
// For both, a value of 0 means "invalid"
if (millis() - tsLastReport > REPORTING_PERIOD_MS) {
display.clear();
display.drawString(0, 0, "HR: " + String(pox.getHeartRate()) + " bpm");
display.drawString(0, 32, "SpO2: " + String(pox.getSpO2()) +" %");
display.display();
Serial.print("Heart rate:");
Serial.print(pox.getHeartRate());
Serial.print("bpm / SpO2:");
Serial.print(pox.getSpO2());
Serial.println("%");

tsLastReport = millis();
}
}