#include <OneWire.h> 
#include <DallasTemperature.h> 
#include <LiquidCrystal_I2C.h> 
 
const int SENSOR_PIN = 13;  
// Arduino pin connected to DS18B20 sensor's DQ pin 
 
OneWire oneWire(SENSOR_PIN);         
 // setup a oneWire instance 
DallasTemperature sensors(&oneWire);  
// pass oneWire to DallasTemperature library 
LiquidCrystal_I2C lcd(0x27, 16, 2);  
 // I2C address 0x27 (from DIYables LCD), 16 column and 
 
float tempCelsius;    
 // temperature in Celsius 
 
float tempFahrenheit;  
// temperature in Fahrenheit 
 
void setup() 
{ 
  sensors.begin();     
// initialize the sensor 
  lcd.init();         
 // initialize the lcd 
  lcd.backlight();     
// open the backlight  
} 
 
void loop() 
{ 
  sensors.requestTemperatures();              
// send the command to get temperatures 
 
  tempCelsius = sensors.getTempCByIndex(0);  
 // read temperature in Celsius 
  tempFahrenheit = tempCelsius * 9 / 5 + 32;  
// convert Celsius to Fahrenheit 
 
  lcd.clear(); 
  lcd.setCursor(0, 0);       
 // start to print at the first row 
  lcd.print(tempCelsius);     
// print the temperature in Celsius 
  lcd.print((char)223);       
// print ° character 
  lcd.print("C"); 
  lcd.setCursor(0, 1);        
// start to print at the second row 
  lcd.print(tempFahrenheit);  
// print the temperature in Fahrenheit 
 
  lcd.print((char)223);       
// print ° character 
  lcd.print("F"); 
  delay(500); 
}