Arduino 11 - servo jednoducho

int pulz;

void setup() {
   pinMode(2, OUTPUT);
   pulz = 1500;
   Serial.begin(9600);
}

void loop() {
  if (Serial.available())
  {
    char c = Serial.read();
    if (c == 'a') pulz += 5;
    if (c == 'z') pulz -= 5;
    Serial.println(pulz);
  }
  digitalWrite(2, HIGH);
  delayMicroseconds(pulz);
  digitalWrite(2, LOW);
  delay(18);
}