/*
Claude EMERY 06/02/2025
   ESP32 + DHT22 + LCD2004  
*/

#include "DHT.h"
#include <LiquidCrystal_I2C.h>
#define DHTPIN 15
#define DHTTYPE DHT22 

LiquidCrystal_I2C lcd(0x27, 20, 4);
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(115200);
  dht.begin();    // Initialisation DHT22
  lcd.init();    // Initialisation LCD2004
  lcd.backlight();  // Rétro-éclairage LCD
}

void loop() {
  delay(2000);    // Delai 2s
  float h = dht.readHumidity();  // Humidité
  float t = dht.readTemperature();   // Temperature  Celsius
  float f = dht.readTemperature(true);    // Temperature Fahrenheit ( = true)

  if (isnan(h) || isnan(t) || isnan(f)) {     // Si pas dedonnée du DHT = ERREUR
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }

// Affichage moniteur série
  Serial.print("Humidite: ");
  Serial.print(h);
  Serial.print("%   Temperature Celcius: ");
  Serial.print(t);
  Serial.print("°C  ");
  Serial.print("Temperature Fahrenheit: ");
  Serial.print(f);
  Serial.println("°F "); // println pour retour à la ligne

// Affichage LCD2004
  lcd.clear();   // Effacement LCD

  lcd.setCursor(0,0);   // Ligne 1 - Humidité
  lcd.print("Humidite:");  
  lcd.setCursor(12,0);   
  lcd.print(h);
  lcd.setCursor(18,0);
  lcd.write(37);  // Affiche % = 37

  lcd.setCursor(0,1);   // Ligne 2 - Température Celcius
  lcd.print("Temp Cel:");
  lcd.setCursor(12,1);   
  lcd.print(t);
  lcd.setCursor(18,1);
  lcd.print("C");

  lcd.setCursor(0,2);  //  Ligne 3 - Température Fahrenheit
  lcd.print("Temp Far:");
  lcd.setCursor(11,2);   
  lcd.print(f);
  lcd.setCursor(18,2);
  lcd.print("F");

  lcd.setCursor(6,3);  //  Ligne 4 - Affiche ******
  lcd.print("********");

  delay(2000);   // delai 2s
}