heart_beat_ex01.ino

#include <Average.h>
#define WINDOW_SIZE 30
#define IR_REC_PIN A0

int ref_val = 0;

Average<int> an_buff(30);

int calibrate()
{
int i=0;
an_buff.clear();  

for(i=0;i<WINDOW_SIZE;i++)
 {
   an_buff.push(analogRead(IR_REC_PIN));
   
   delay(10);
   
 
 
 }
return an_buff.mode();

}



void setup() {
Serial.begin(9600);
delay(1000);
Serial.println("Ready...");
pinMode(13,OUTPUT);


}

int dt=0;
void loop() 
{
int s_val = analogRead(A0);
 float cent_val =(3.3 * analogRead(A1) * 100.0) / 1024;
s_val = map(s_val,0,1023,0,50);

if(s_val>25)
 {
  digitalWrite(13,HIGH); 
  dt=0;
  
 }
 else if(s_val<15)
 {
   dt++;
   if(dt>4)
    
    digitalWrite(13,LOW);
  
  }  
  Serial.println(s_val);
  delay(20);

}