#include <Wire.h> //Include Wire Library for I2C
#include <Adafruit_GFX.h> //Include Adafruit GFX Library
#include <Adafruit_SSD1306.h> //Include Adafruit OLED Library
#include "MAX30105.h"//Include MAX30105 Library
#include "heartRate.h"//Heart rate calculating algorithm
MAX30105 particleSensor;//Define object MAX30105
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#define OLED_RESET 4 // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);//Declaring the display name (display)
const byte RATE_SIZE = 4; //Increase this for more averaging. 4 is good.
byte rates[RATE_SIZE]; //Array of heart rates
byte rateSpot = 0;
long lastBeat = 0; //Time at which the last beat occurred
float beatsPerMinute;
int beatAvg;
void setup() {
Wire.begin(); //Start Wire library for I2C
display.begin(SSD1306_SWITCHCAPVCC, 0x3C); //initialize OLED with I2C address 0×3C
//Serial.begin(115200); //Initialize baud rate
particleSensor.begin(Wire, I2C_SPEED_FAST); //Use default I2C port, 400kHz speed
particleSensor.setup(); //Configure sensor with default settings
particleSensor.setPulseAmplitudeRed(0x0A); //Turn Red LED to low to indicate sensor is running
}
void loop() {
long irValue = particleSensor.getIR();
if (checkForBeat(irValue) == true)//If a heart beat is detected
{
display.clearDisplay(); //Clear the display
display.setTextSize(2);
display.setTextColor(WHITE);
display.setCursor(0, 0);
display.print("MaxChina");
display.setCursor(0, 20);
display.print("BPM=");
display.print(beatAvg);
display.display();
long delta = millis() - lastBeat;
lastBeat = millis();
beatsPerMinute = 60 / (delta / 1000.0);
if (beatsPerMinute < 255 && beatsPerMinute > 20)
{
rates[rateSpot++] = (byte)beatsPerMinute; //Store this reading in the array
rateSpot %= RATE_SIZE; //Wrap variable
//Take average of readings
beatAvg = 0;
for (byte x = 0 ; x < RATE_SIZE ; x++)
beatAvg += rates[x];
beatAvg /= RATE_SIZE;
}
}
if (irValue < 50000) {
beatAvg = 0;
display.clearDisplay();
display.setTextSize(2);
display.setTextColor(WHITE);
display.setCursor(15, 20);
display.println("no finger");
display.display();
}
}
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