#include <DHT.h>   // Include the DHT sensor library
#define DHTPIN 16   // Define the pin to which the DHT sensor is connected
#define DHTTYPE DHT22   // Define the type of DHT sensor being used
DHT dht(DHTPIN, DHTTYPE);   // Create a DHT object
#include <LiquidCrystal.h>
LiquidCrystal lcd(2, 3, 4, 5, 6, 7);

void setup() {
  Serial.begin(115200);   // Initialize serial communication
  dht.begin();   // Initialize the DHT sensor
  pinMode(38, OUTPUT);   // Set pin 38 as an output
  pinMode(19, OUTPUT);   // Set pin 19 as an output
  lcd.begin(16, 2);
}

void loop() {
  delay(2000);   // Delay for 2 seconds 
  lcd.clear();// Clear LCD screen
  
  float temp = dht.readTemperature();   // Read temperature from the DHT sensor
  float hum = dht.readHumidity();   // Read humidity from the DHT sensor
  
   int16_t ppmValue = analogRead(36);// Value after from AD convertor
   int mappedppmValue = (ppmValue/4.095);// Map the correct value ad AD convertor expects max votage to be 3.3 V and we are sending 5 V
  
  
 
  
  
  // Print temperature and humidity readings on LCD
  lcd.setCursor(0, 0); // Set cursor to first column of first row
  lcd.print("Temp:");
  lcd.print(temp);
  lcd.print(" C");

  lcd.setCursor(0, 1); // Set cursor to first column of second row
  lcd.print("H:");
  lcd.print(hum);
  lcd.print("%");

  lcd.setCursor(9, 1); // Set cursor to first column of 3 row
  lcd.print("PPM:"); 
  lcd.print(mappedppmValue); 

 // Print temperature and humidity readings to the serial monitor
  Serial.print("La température actuelle est : ");
  Serial.print(temp);
  Serial.println("°C");
  Serial.print("humidité: ");
  Serial.print(hum);
  Serial.println(" %");
  Serial.print("PPM: "); // Control the output based on temperature
  Serial.println(mappedppmValue); //  Print maapedTdsValue

  
  if (temp > 27) {
    for (int i = 0; i < 6; i++) {

      digitalWrite(38, HIGH);   // Turn on pin 38
      delay(900);   // Delay for 900 milliseconds
      digitalWrite(38, LOW);   // Turn off pin 38
      delay(900);   // Delay for another 900 milliseconds
  }} else {
    for (int i = 0; i < 6; i++) {

      digitalWrite(19, HIGH);   // Turn on pin 19
      delay(900);   // Delay for 900 milliseconds
      digitalWrite(19, LOW);   // Turn off pin 19
      delay(900);   // Delay for another 900 milliseconds
    }}
       

  
}