/*
Titel: Led dimmen/ Übung für Test
Author: Gregor Mausser
Date: 14.1.2026
*/

const int LedPin = 3;
const int ButtonPin = 5;
int mode = 0;

//gegen Tastenprellen (mit millis)
bool lastReading = HIGH;
bool stableState = HIGH;

unsigned long lastDebounceTime = 0;        
const unsigned long debounceDelay = 30;     


void dimUp(int maxValue)  {
  for (int i = 0; i <= maxValue; i++ ){
    analogWrite(LedPin, i);
    Serial.println(i);
  }
}

void dimDown(int maxValue, int minValue)  {
  for (int i = maxValue; i >= minValue; i-- ){
    analogWrite(LedPin, i);
    Serial.println(i);
  }
}

void setup() {
  Serial.begin(9600);
  pinMode(LedPin, OUTPUT);
  pinMode(ButtonPin, INPUT_PULLUP);
}

void loop() {

  bool reading = digitalRead(ButtonPin);

  if (reading != lastReading) {
    lastDebounceTime = millis();
  }

  if ((millis() - lastDebounceTime) > debounceDelay) {

    if (reading != stableState) {
      stableState = reading;

      if (stableState == LOW) {    
        mode++;
        switch (mode) {
  
          //Dimmen von 0% - 100%
          case 1:
            dimUp(255);
            break;
          
          //Dimmen von 100% - 50%
          case 2:
            dimDown(255, 127);
            break;
          
          //Dimmen von 50% - 0%
          case 3:
            dimDown(127, 0);
            break;
          
          //Led ausschalten
          default:
            analogWrite(LedPin, 0);
            Serial.println("Led ist OFF");
            mode = 0;
            break;

      }
    }
  }
  lastReading = reading;


}

}