#include <LiquidCrystal_I2C.h> // address, width, height
LiquidCrystal_I2C lcd(0x27, 20, 4);
#define ADC_VREF_mV    5000.0 // in millivolt
#define ADC_RESOLUTION 1024.0
#define PIN_LM35       A0

void setup() {
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
}

void loop() {
  // get the ADC value from the temperature sensor
  int adcVal = analogRead(PIN_LM35);
  // convert the ADC value to voltage in millivolt
  float milliVolt = adcVal * (ADC_VREF_mV / ADC_RESOLUTION);
  // convert the voltage to the temperature in Celsius
  float tempC = milliVolt / 10;
  // convert the Celsius to Fahrenheit
  float tempF = tempC * 9 / 5 + 32;

  // print the temperature in the Serial Monitor:
  Serial.print("Temperature: ");
  Serial.print(tempC);   // print the temperature in Celsius
  Serial.print("°C");
  Serial.print("  ~  "); // separator between Celsius and Fahrenheit
  Serial.print(tempF);   // print the temperature in Fahrenheit
  Serial.println("°F");
  lcd.setCursor(0,0);
  lcd.print("Temp: ");
  lcd.print(tempC);   // print the temperature in Celsius
  lcd.print("°C");
  lcd.setCursor(6,1);
  lcd.print(tempF);   // print the temperature in Fahrenheit
  lcd.println("°F");
  lcd.setCursor(0,2);
  lcd.print("Syamsy/18/EK2D");
  delay(1000);
}