lettura sensore 18B20

// Include the libraries we need
#include <OneWire.h>
#include <DallasTemperature.h>
// Data wire is plugged into port 10 on the Arduino
#define ONE_WIRE_BUS 10
// Setup a oneWire instance to communicate with any OneWire devices (not just
Maxim/Dallas temperature ICs)
OneWire oneWire(ONE_WIRE_BUS);
// Pass our oneWire reference to Dallas Temperature.
DallasTemperature sensors(&oneWire);
/*
* The setup function. We only start the sensors here
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*/
void setup(void)
{
 // start serial port
 Serial.begin(9600);
 Serial.println("Dallas Temperature IC Control Library Demo");
 // Start up the library
 sensors.begin();
}
/*
* Main function, get and show the temperature
*/
void loop(void)
{
 // call sensors.requestTemperatures() to issue a global temperature
 // request to all devices on the bus
 Serial.print("Requesting temperatures...");
 sensors.requestTemperatures(); // Send the command to get temperatures
 Serial.println("DONE");
 // After we got the temperatures, we can print them here.
 // We use the function ByIndex, and as an example get the temperature from the
first sensor only.
 Serial.print("Temperature for the device 1 (index 0) is: ");
 Serial.println(sensors.getTempCByIndex(0));
}