#include <TimerOne.h>

#define LED_PIN 9  // LED an Pin 9

void setup() {
  pinMode(LED_PIN, OUTPUT);

  // Timer1 mit 1 kHz PWM-Frequenz initialisieren
  Timer1.initialize(1000);  // 1000 µs = 1 ms (1 kHz)
  
  // PWM starten mit 50% Duty Cycle
  Timer1.pwm(LED_PIN, 512); // 50% von 1024
}

void loop() {
  for (int duty = 0; duty <= 1023; duty += 10) { 
    Timer1.pwm(LED_PIN, duty);  // PWM-Wert setzen
    delay(20);  // Sanfte Dimmung
  }
  
  for (int duty = 1023; duty >= 0; duty -= 10) { 
    Timer1.pwm(LED_PIN, duty);
    delay(20);
  }
}