//LAP COUNTER SETUP ///////////////////////////////////////////////////
const int dlen = 4;     //number of samples averaged 
double d[dlen] = {0};    // need a 0 for every sample to average

void pushd(double val) {
  for (int i = 1; i < dlen; i++) {
    d[i-1] = d[i]; 
  }
  d[dlen - 1] = val;
//Serial.print ("val: "); /// same as ad
//Serial.println (val,3);
  
}

double avgd() {
  double sum = 0;
  for (int i = 0; i < dlen; i++) {
 
    sum = sum + d[i]; //  adds previous lap to sum
    
//Serial.print ("d[i]: ");
//Serial.println (d[i],3);
//Serial.print ("sum: ");
//Serial.println (sum,3);

    
  }
  double average = sum / (double)dlen;
  return average;

  
}