#include <OneWire.h>
#include <DallasTemperature.h>

// Data wire is connected to digital pin 2
const int oneWireBus = 2;

// Setup a oneWire instance to communicate with any OneWire devices
OneWire oneWire(oneWireBus);

// Pass oneWire reference to Dallas Temperature Sensor 
DallasTemperature sensors(&oneWire);

void setup() {
  // Start serial communication
  Serial.begin(9600);
  
  // Initialize the DS18B20 temperature sensor
  sensors.begin();
}

void loop() {
  // Request temperature data from all DS18B20 sensors on the bus
  sensors.requestTemperatures();
  
  // Get temperature in Celsius from the first DS18B20 sensor
  // Why "byIndex"? You can have more than one IC on the same bus. 
  // 0 refers to the first IC on the wire
  float temperatureCelsius = sensors.getTempCByIndex(0);

  if (temperatureCelsius != DEVICE_DISCONNECTED_C) {
    // Print the temperature to the serial monitor
    Serial.print("Temperature: ");
    Serial.print(temperatureCelsius);
    Serial.println(" °C");
  } else {
    Serial.println("Error: Could not read temperature data.");
  }

  // Delay for a while before reading again
  delay(1000);
}