#include <LiquidCrystal_I2C.h>
#include "DHT.h"
#define DHTPIN 2
#define DHTTYPE DHT11
#define POTPIN A0  // Define the analog pin for the potentiometer

LiquidCrystal_I2C lcd(0x27, 20, 4);  // I2C address 0x27, 20 columns and 4 rows
DHT dht(DHTPIN, DHTTYPE);

void setup()
{
  dht.begin();     // initialize the sensor
  lcd.init();      // initialize the lcd
  lcd.backlight(); // open the backlight
}

void loop()
{
  delay(2000); // wait a few seconds between measurements

  float humi  = dht.readHumidity();    // read humidity
  float tempC = dht.readTemperature(); // read temperature
  int potValue = analogRead(POTPIN);   // read the potentiometer value

  lcd.clear();
  // check if any reads failed
  if (isnan(humi) || isnan(tempC)) {
    lcd.setCursor(0, 0);
    lcd.print("Failed");
  } else {
    char tempStr[7]; // buffer to hold the formatted temperature string
    char humiStr[7]; // buffer to hold the formatted humidity string

    dtostrf(tempC, 3, 2, tempStr); // convert temperature to string with 2 decimal places
    dtostrf(humi, 3, 2, humiStr);  // convert humidity to string with 2 decimal places

    lcd.setCursor(0, 0);  // start to print at the first row
    lcd.print("Temp: ");
    lcd.print(tempStr);   // print the formatted temperature
    lcd.print((char)223); // print ° character
    lcd.print("C");

    lcd.setCursor(0, 1);  // start to print at the second row
    lcd.print("Humi: ");
    lcd.print(humiStr);   // print the formatted humidity
    lcd.print("%");

    lcd.setCursor(0, 2);  // start to print at the third row
    lcd.print("Pot: ");
    lcd.print(potValue);  // print the potentiometer value
  }
}