int msrin = 10;
int refin = 11;
int led = 13;
int compout = 9;
long microstart = 0;
long microend = 0;
int msrinput = 0;
long calced1;
float calced;

void setup() {

  Serial.begin(9600);
  pinMode(msrin, OUTPUT);
  pinMode(refin, OUTPUT);
  pinMode(led, OUTPUT);
  pinMode(compout, INPUT);
}

void loop() {

  digitalWrite(msrin, HIGH);
  digitalWrite(refin, LOW);
  while (1)
  {
    msrinput = digitalRead(compout);
    if (msrinput == 0)
    {
      microstart = micros();
      break;
    }
  }

  while (1)
  {
    microend = micros();
    if ((microend - microstart) >= 100000)
    {
      break;
    }
  }

  digitalWrite(msrin, LOW);
  digitalWrite(refin, HIGH);
  microstart = micros();

  while(1) //check if cap is uncharged
  {
    msrinput = digitalRead(compout);
    if (msrinput == 1)
    {
      microend = micros();
      calced1 = (microend - microstart);
      calced = 2.52 * (calced1 / 100000.0);
      Serial.println(calced);
      break;
    }
  }

}