Heart Rate Monitor

Forum 2005-2010 (read only) General Exhibition
8

Thank you for this nice idea! I've try it but it does not seem to work, although some things were not working properly, I made somage changes to make it theorically working but it doesn't, here it is:

int  D3 = 3, D4 = 4, D5 =5, D6 = 6, D7 = 7, D8 = 8;
volatile unsigned long beats = 0, lastTime, period;


void setup()
{
  pinMode(D3, OUTPUT);                                   //P3 to P8 as output
  pinMode(D4, OUTPUT);
  pinMode(D5, OUTPUT);
  pinMode(D6, OUTPUT);
  pinMode(D7, OUTPUT);
  pinMode(D8, OUTPUT);
  attachInterrupt(0, pulse, FALLING);                     //call pulse function when an interrupt is detected on Port 2;
  Serial.begin(9600);
}

void loop()
{
  static int fc;
  int frequence;
  if (beats > 1) {
    Serial.println(period, DEC);
    frequence = (60000 / period);         //calculate bpm using time between the two pulses
    if ((frequence >= 40) && (frequence <= 220)) {   //if bpm is between 40 and 220
      fc = frequence;
    }
  }
  ssegment(fc);                                         //call ssegments function
}

void pulse()
{
  if (beats > 0){
    period =  millis() - lastTime;
    beats = 0;
  }
  lastTime = millis();
  beats++;
  }
}

void ssegment(int fc) {