DS18B20 Schematic

This sensor is available in a waterproof version for outdoor use.

/* DS18B20 1-Wire digital temperature sensor with Arduino example code. More info: https://www.makerguides.com */
// Include the required Arduino libraries:
#include <OneWire.h>
#include <DallasTemperature.h>
// Define to which pin of the Arduino the 1-Wire bus is connected:
#define ONE_WIRE_BUS 2
// Create a new instance of the oneWire class to communicate with any OneWire device:
OneWire oneWire(ONE_WIRE_BUS);
// Pass the oneWire reference to DallasTemperature library:
DallasTemperature sensors(&oneWire);
void setup() {
  // Begin serial communication at a baud rate of 9600:
  Serial.begin(9600);
  // Start up the library:
  sensors.begin();
  sensors.setResolution(12);  // 750 ms
}
void loop() {
  // Send the command for all devices on the bus to perform a temperature conversion:
  sensors.requestTemperatures();
  // Fetch the temperature in degrees Celsius for device index:
  float tempC = sensors.getTempCByIndex(0); // the index 0 refers to the first device
  // Fetch the temperature in degrees Fahrenheit for device index:
  float tempF = sensors.getTempFByIndex(0);
  // Print the temperature in Celsius in the Serial Monitor:
  Serial.print("Temperature: ");
  Serial.print(tempC);
  Serial.print(" \xC2\xB0"); // shows degree symbol
  Serial.print("C  |  ");
  // Print the temperature in Fahrenheit
  Serial.print(tempF);
  Serial.print(" \xC2\xB0"); // shows degree symbol
  Serial.println("F");
  // Wait 1 second:
  delay(1000);
}