#include <Wire.h>
#include <LiquidCrystal_I2C.h>

const int potPin = A0;
const int redLED = 9;
const int greenLED = 10;
const int blueLED = 11;

LiquidCrystal_I2C lcd(0x27, 16, 2); // LCD mit I2C-Adresse 0x27

void setup() {
  pinMode(redLED, OUTPUT);
  pinMode(greenLED, OUTPUT);
  pinMode(blueLED, OUTPUT);

  lcd.init();            // LCD initialisieren
  lcd.backlight();       // Hintergrundbeleuchtung einschalten
}

void loop() {
  int potValue = analogRead(potPin);  // 0 bis 1023

  // Bereichsabhängige LED-Steuerung
  if (potValue < 341) {
    digitalWrite(redLED, HIGH);
    digitalWrite(greenLED, LOW);
    digitalWrite(blueLED, LOW);
  }
  else if (potValue < 682) {
    digitalWrite(redLED, LOW);
    digitalWrite(greenLED, HIGH);
    digitalWrite(blueLED, LOW);
  }
  else {
    digitalWrite(redLED, LOW);
    digitalWrite(greenLED, LOW);
    digitalWrite(blueLED, HIGH);
  }

  // LCD-Anzeige
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Poti-Wert:");
  lcd.setCursor(0, 1);
  lcd.print(potValue);

  delay(200); // kleine Pause
}