#include <Ticker.h>
#define SERVO 3

int winkel;
int einschaltdauerServo;




void winkelEinstellen()
{
  static int counter = 0;
  if (counter == 0)
  {
    digitalWrite(SERVO,HIGH);
  }
  if (counter == einschaltdauerServo)
  {
    digitalWrite(SERVO,LOW);
  }
  counter++;
  if (counter>3999)
  {
    counter = 0;
  }
}

Ticker ticker(winkelEinstellen,5,0,MICROS_MICROS);

void setup() {
  ticker.start();
  Serial.begin(9600);
  pinMode(SERVO, OUTPUT);
  winkel = 60;
  einschaltdauerServo = map(winkel,0,180,200,400);
}

void loop() 
{
 ticker.update();
}