#define analogPin      A0
#define chargePin      6
#define dischargePin   7
#define resistorValue  10000.0F
#define dioda          13

unsigned long startTime;
unsigned long elapsedTime;
float microFarads;
float nanoFarads;

void setup(){
  pinMode(chargePin, OUTPUT);
  pinMode(dioda,OUTPUT);
  digitalWrite(chargePin, LOW);

  Serial.begin(9600);
}

void loop(){
  digitalWrite(chargePin, HIGH);
  startTime = millis();


  while(analogRead(analogPin) < 648){

  }
  digitalWrite(dioda, HIGH);

  elapsedTime= millis() - startTime;  microFarads = ((float)elapsedTime / resistorValue) * 1000;
  Serial.print(elapsedTime);
  Serial.print(" mS    ");


  if (microFarads > 1){
    Serial.print((long)microFarads);
    Serial.println(" microFarads");
  }
  else
  {

    nanoFarads = microFarads * 1000.0;
    Serial.print((long)nanoFarads);
    Serial.println(" nanoFarads");
  }


  digitalWrite(chargePin, LOW);
  pinMode(dischargePin, OUTPUT);
  digitalWrite(dischargePin, LOW);
  while(analogRead(analogPin) > 0){
  };
  digitalWrite(dioda, LOW);
  pinMode(dischargePin, INPUT);
}