#include <OneWire.h>
#include <DallasTemperature.h>
#define SENSOR_PIN 4  // The Arduino Nano pin connected to DS18B20 sensor's DQ pin

OneWire oneWire(SENSOR_PIN);         // setup a oneWire instance
DallasTemperature DS18B20(&oneWire); // pass oneWire to DallasTemperature library

float C;    // temperature in Celsius
float F;   // temperature in Fahrenheit

void setup()
{
  Serial.begin(9600); // Initialize the Serial to communicate with the Serial Monitor.
  DS18B20.begin();    // initialize the sensor
}

void loop()
{
  DS18B20.requestTemperatures();    // send the command to get temperatures
  C = DS18B20.getTempCByIndex(0);  // read temperature in Celsius
  F = C * 9 / 5 + 32;             // convert Celsius to Fahrenheit

  Serial.print("Temperature: ");
  Serial.print(C);    // print the temperature in Celsius
  Serial.print("°C");
  Serial.print("  ---  ");        // separator between Celsius and Fahrenheit
  Serial.print(F); // print the temperature in Fahrenheit
  Serial.println("°F");
  delay(500);
}