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

LiquidCrystal_I2C lcd(0x27, 16, 2);

int TRIGGER_PIN =9;
int ECHO_PIN =10;
int BUZZER_PIN =5;
int SERVO_PIN =6;

Servo myServo;

long duration;
int distance;

void setup() {
  lcd.begin(16, 2);
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Systeme Init...");
  delay(1000);
  lcd.clear();

  pinMode(TRIGGER_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(BUZZER_PIN, OUTPUT);

  myServo.attach(SERVO_PIN);

  tone(BUZZER_PIN, 1000, 500);
  lcd.setCursor(0, 0);
  lcd.print("Pret a fonctionner");
  delay(1000);
  lcd.clear();
}

void loop() {
  digitalWrite(TRIGGER_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIGGER_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIGGER_PIN, LOW);
  duration = pulseIn(ECHO_PIN, HIGH);
  distance = duration * 0.034 / 2;

  lcd.setCursor(0, 0);
  lcd.print("Niveau d'eau:");
  lcd.setCursor(0, 1);
  lcd.print(distance);
  lcd.print(" cm   ");

  if (distance > 30) {
    myServo.write(90);
    tone(BUZZER_PIN, 1000, 200);
    lcd.setCursor(10, 1);
    lcd.print("Remplissage...");
  } else {
    myServo.write(0);
    noTone(BUZZER_PIN);
    lcd.setCursor(10, 1);
    lcd.print("Plein     ");
  }

  delay(1000);
}