int servo = 9;
int pot = A0;
int potwaarde;
float delayservo;

void setup() {
  // put your setup code here, to run once:
  pinMode(servo, OUTPUT);
}


void loop() {
  potwaarde = analogRead(pot);
  delayservo = ((potwaarde / 1023.0) * 1950) + 500;

  PWMke(delayservo);
}

void PWMke(int tijd) {
  digitalWrite(servo, HIGH);
  delayMicroseconds(tijd);
  digitalWrite(servo, LOW);
  delayMicroseconds(10000 - tijd);
  delayMicroseconds(10000);
}