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

const int trigPin = 9;
const int echoPin = 10;
const int ledPin = 6;  // ➕ Hier kommt die LED dazu

int counter = 0;
bool objectDetected = false;

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(ledPin, OUTPUT); // ➕ LED-Pin als Ausgang

  Serial.begin(9600);

  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Startbereit...");
  delay(1000);
  lcd.clear();
}

void loop() {
  long duration;
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  duration = pulseIn(echoPin, HIGH);
  float distance = duration * 0.034 / 2;

  if (distance < 20 && !objectDetected) {
    counter++;
    Serial.print("Zähler: ");
    Serial.println(counter);
    objectDetected = true;

    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Objekt erkannt!");
    lcd.setCursor(0, 1);
    lcd.print("Zähler: ");
    lcd.print(counter);

    digitalWrite(ledPin, HIGH);  // ➕ LED AN

    delay(1000);
  } else if (distance >= 10) {
    objectDetected = false;
    digitalWrite(ledPin, LOW);   // ➕ LED AUS
  }

  delay(100);
}