#include <LiquidCrystal.h>
#include <DHT.h>

// LCD connecté sur broches 12, 11, 5, 4, 3, 2
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

// Capteur DHT22 sur broche D7
#define DHTPIN 7
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

// LEDs et buzzer
const int ledVerte = 8;
const int ledRouge = 9;
const int ledBleue = 6;
const int buzzer = 10;

void setup() {
  pinMode(ledVerte, OUTPUT);
  pinMode(ledRouge, OUTPUT);
  pinMode(ledBleue, OUTPUT);
  pinMode(buzzer, OUTPUT);
  lcd.begin(16, 2);
  dht.begin();
  lcd.setCursor(0, 0);
  lcd.print("Initialisation...");
  delay(1500);
}

void loop() {
  float temperature = dht.readTemperature(); // °C
  float humidite = dht.readHumidity();       // %

  // Vérification de lecture
  if (isnan(temperature) || isnan(humidite)) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Erreur capteur !");
    digitalWrite(ledRouge, LOW);
    digitalWrite(ledVerte, LOW);
    digitalWrite(ledBleue, LOW);
    noTone(buzzer);
    delay(2000);
    return;
  }

  // Affichage LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("T:");
  lcd.print(temperature, 1);
  lcd.print("C H:");
  lcd.print(humidite, 0);
  lcd.print("%");

  // État thermique
  lcd.setCursor(0, 1);
  if (temperature >= 40) {
    digitalWrite(ledRouge, HIGH);
    digitalWrite(ledVerte, LOW);
    digitalWrite(ledBleue, LOW);
    tone(buzzer, 1000, 500);
    lcd.print("Trop chaud !");
  } else if (temperature < 10) {
    digitalWrite(ledBleue, HIGH);
    digitalWrite(ledVerte, LOW);
    digitalWrite(ledRouge, LOW);
    tone(buzzer, 800, 500);
    lcd.print("Trop froid !");
  } else {
    digitalWrite(ledVerte, HIGH);
    digitalWrite(ledRouge, LOW);
    digitalWrite(ledBleue, LOW);
    noTone(buzzer);
    lcd.print("OK");
  }

  delay(2000); // mise à jour toutes les 2 secondes
}