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 1 // Include the libraries we need
 2 #include 
 3 #include 
 4 
 5 // Data wire is plugged into port 2 on the Arduino
 6 #define ONE_WIRE_BUS 2
 7 
 8 // Setup a oneWire instance to communicate with any OneWire devices (not just Maxim/Dallas temperature ICs)
 9 OneWire oneWire(ONE_WIRE_BUS);
10 
11 // Pass our oneWire reference to Dallas Temperature. 
12 DallasTemperature sensors(&oneWire);
13 
14 /*
15  * The setup function. We only start the sensors here
16  */
17 void setup(void)
18 {
19   // start serial port
20   Serial.begin(9600);
21   Serial.println("Dallas Temperature IC Control Library Demo");
22 
23   // Start up the library
24   sensors.begin();
25 }
26 
27 /*
28  * Main function, get and show the temperature
29  */
30 void loop(void)
31 { 
32   // call sensors.requestTemperatures() to issue a global temperature 
33   // request to all devices on the bus
34   Serial.print("Requesting temperatures...");
35   sensors.requestTemperatures(); // Send the command to get temperatures
36   Serial.println("DONE");
37   // After we got the temperatures, we can print them here.
38   // We use the function ByIndex, and as an example get the temperature from the first sensor only.
39   float tempC = sensors.getTempCByIndex(0);
40 
41   // Check if reading was successful
42   if(tempC != DEVICE_DISCONNECTED_C) 
43   {
44     Serial.print("Temperature for the device 1 (index 0) is: ");
45     Serial.println(tempC);
46   } 
47   else
48   {
49     Serial.println("Error: Could not read temperature data");
50   }
51 }