#include <DHT.h>
#include <LiquidCrystal_I2C.h>
#include <DHT_U.h>
#include <SPI.h>
#include <SD.h>


// Define the pins for the sensors
#define DHTTYPE DHT22
#define DHT1_PIN 21
#define DHT2_PIN 14
#define DHT3_PIN 13
#define SD_CS_PIN 5
#define FILENAME "data.txt"
DHT dht2(DHT2_PIN, DHTTYPE);
DHT dht3(DHT3_PIN, DHTTYPE);
DHT dht1(DHT1_PIN, DHTTYPE);
File dataFile;


// Initialize the LCD screen
LiquidCrystal_I2C lcd(0x27, 20, 4); // Change the I2C address and size of the LCD if necessary


void setup() {
  // Start the serial communication
  Serial.begin(9600);
  dht1.begin();
  dht2.begin();
  dht3.begin();


  // Initialize the LCD screen
  lcd.init();
  lcd.backlight();

  // Print the sensor headers on the LCD screen
  lcd.setCursor(0, 0);
  lcd.print("DHT 1: ");
  lcd.setCursor(0, 1);
  lcd.print("DHT 2: ");
  lcd.setCursor(0, 2);
  lcd.print("DHT 3: ");
  SPI.begin();
  pinMode(SD_CS_PIN, OUTPUT);
  digitalWrite(SD_CS_PIN,LOW);
   if (!SD.begin(SD_CS_PIN)) {
    Serial.println("Card failed, or not present");
    return;
   }
   else{
     Serial.println("card initialised");
   }
  dataFile = SD.open("data.txt", FILE_WRITE);
  if (dataFile) {
    dataFile.println("Timestamp,Temperature(*C),Humidity(%)");
    dataFile.close();
    } 
  else {
    Serial.println("error opening file");
    }
}

void loop() {
  // Read the sensor values
  float DHT1_TEMP = dht1.readTemperature(DHT1_PIN);
  float DHT2_TEMP = dht2.readTemperature(DHT2_PIN);
  float DHT3_TEMP = dht3.readTemperature(DHT3_PIN);
  float DHT1_HUM = dht1.readHumidity(DHT1_PIN);
  float DHT2_HUM = dht2.readHumidity(DHT2_PIN);
  float DHT3_HUM = dht3.readHumidity(DHT3_PIN);


  // Print the sensor values on the serial monitor
  Serial.print("\nSensor 1: ");
  Serial.print("\ttemperature: ");
  Serial.print(DHT1_TEMP);
  Serial.print("\thumidity: ");
  Serial.print(DHT1_HUM);
  Serial.print("\nSensor 2: ");
  Serial.print("\ttemperature: ");
  Serial.print(DHT2_TEMP);
  Serial.print("\thumidity: ");
  Serial.print(DHT2_HUM);
  Serial.print("\nSensor 3: ");
  Serial.print("\ttemperature: ");
  Serial.print(DHT3_TEMP);
  Serial.print("\thumidity: ");
  Serial.print(DHT3_HUM);

  // Print the sensor values on the LCD screen
  lcd.setCursor(7, 0);
  lcd.print(DHT1_TEMP);
  lcd.print("c");
  lcd.print(DHT1_HUM);
  lcd.print("%");
  lcd.setCursor(7, 1);
  lcd.print(DHT2_TEMP);
  lcd.print("c");
  lcd.print(DHT2_HUM);
  lcd.print("%");
  lcd.setCursor(7, 2);
  lcd.print(DHT3_TEMP);
  lcd.print("c");
  lcd.print(DHT3_HUM);
  lcd.print("%");
  
  // Wait for 1 second before reading the sensors again
  delay(10000);
}