Using the code given (for an arduino mega), how do you find heart beat per minut

Question

Using the code given (for an arduino mega), how do you find heart beat per minute and have it display in the serial port?

#include // Math Library

// variables for the pushbutton
const int buttonPin=2; // Push Button
volatile int pushValue; // value of button

// constants for the Buzzer
const int speakerPin=8;

// constants for RGB LED
const int GreenledPin = 5; // Green LED
const int RedledPin = 3; // Red LED
const int BlueledPin = 6; // Blue LED

// variables for Analog Signals
const int Analog2Pin=3; // Thermistor input
const int PulsePin=1; // Pulse sensor Input
const int PotPin=0; // Potentiometer pin
int Vth; // thermistor value

int waittime=1000;

// The setup() method runs once, when the sketch starts
void setup() {
// initialize the digital pin as an output:
pinMode(GreenledPin, OUTPUT);
pinMode(RedledPin, OUTPUT);   
pinMode(BlueledPin, OUTPUT);
// tun off RGB LEDs
digitalWrite(GreenledPin, HIGH);
digitalWrite(RedledPin, HIGH);   
digitalWrite(BlueledPin, HIGH);
//
pinMode(buttonPin,INPUT);
pinMode(speakerPin,OUTPUT);   
// Serial Comm
Serial.begin(115200);
}

// the loop() method runs over and over again,
// as long as the Arduino has power
int pot_reading; // potentiometer's value in ADC units (0:1023)
float pot_reading_volts; // potentiometer's value in Volts (0:5)
int pulse_value;
int state=0;
int Threshold=520; // for pulse
long int T0=0;
long int dT;
float HR;
void loop()
{
pulse_value = analogRead(PulsePin);
Serial.println(pulse_value);
switch (state) {
case 0:
if (pulse_value>Threshold) {
dT=millis()-T0;
T0=T0+dT;

tone(speakerPin,1000,200);
digitalWrite(GreenledPin,LOW);
digitalWrite(RedledPin,HIGH);
state=1;
}
break;
case 1:
if (pulse_value<=Threshold) {
digitalWrite(GreenledPin,HIGH);
digitalWrite(RedledPin,LOW);
state=0;
}
}
delay(1);
}

Explanation / Answer

Ans:

program: heart beat per minute

// def buffer-size four

#define ADC_BUFFER_SIZE 4

// adc buffer-static

static uint8_t seq_buffer[ADC_BUFFER_SIZE];

//usess the buffer of 4 uint8_t bytes to store analog-signal

uint32_t signal = (uint32_t) seq_buffer[0]

| (uint32_t) seq_buffer[1] << 8

| (uint32_t) seq_buffer[2] << 16

| (uint32_t) seq_buffer[3] << 24;

// heart rate measure

value = measure_heartrate(signal);

displayng heart_beat::

// static , fade effect

static void show_heartbeat_using_fade_effect(int index)

{

// red green blue

uint8_t red, green, blue;

// fade_rate & index less then 0, index greater than 3

if (!glcd || fadeRate < 0 || index < 0 || index > 3) {

// return

return;

}

// for red 0xff

red = (color[index][0] * fadeRate / 245) & 0xff;

// for green 0xff

green = (color[index][1] * fadeRate / 245) & 0xff;

// for blue 0xff

blue = (color[index][2] * fadeRate / 245) & 0xff;

// color set

glcd_color_set(glcd, red, green, blue);

// rate

fadeRate -= 16;

}

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