5f42de5 Jan 9, 2019
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#include <OneWire.h>
#include <DallasTemperature.h>
// Data wire is plugged into port 2 on the Arduino
#define ONE_WIRE_BUS 2
#define TEMPERATURE_PRECISION 9 // Lower resolution
// 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);
int numberOfDevices; // Number of temperature devices found
DeviceAddress tempDeviceAddress; // We'll use this variable to store a found device address
void setup(void)
// start serial port
Serial.println("Dallas Temperature IC Control Library Demo");
// Start up the library
// Grab a count of devices on the wire
numberOfDevices = sensors.getDeviceCount();
// locate devices on the bus
Serial.print("Locating devices...");
Serial.print("Found ");
Serial.print(numberOfDevices, DEC);
Serial.println(" devices.");
// report parasite power requirements
Serial.print("Parasite power is: ");
if (sensors.isParasitePowerMode()) Serial.println("ON");
else Serial.println("OFF");
// Loop through each device, print out address
for(int i=0;i<numberOfDevices; i++)
// Search the wire for address
if(sensors.getAddress(tempDeviceAddress, i))
Serial.print("Found device ");
Serial.print(i, DEC);
Serial.print(" with address: ");
Serial.print("Setting resolution to ");
// set the resolution to TEMPERATURE_PRECISION bit (Each Dallas/Maxim device is capable of several different resolutions)
sensors.setResolution(tempDeviceAddress, TEMPERATURE_PRECISION);
Serial.print("Resolution actually set to: ");
Serial.print(sensors.getResolution(tempDeviceAddress), DEC);
Serial.print("Found ghost device at ");
Serial.print(i, DEC);
Serial.print(" but could not detect address. Check power and cabling");
// function to print the temperature for a device
void printTemperature(DeviceAddress deviceAddress)
// method 1 - slower
//Serial.print("Temp C: ");
//Serial.print(" Temp F: ");
//Serial.print(sensors.getTempF(deviceAddress)); // Makes a second call to getTempC and then converts to Fahrenheit
// method 2 - faster
float tempC = sensors.getTempC(deviceAddress);
Serial.println("Error: Could not read temperature data");
Serial.print("Temp C: ");
Serial.print(" Temp F: ");
Serial.println(DallasTemperature::toFahrenheit(tempC)); // Converts tempC to Fahrenheit
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
// Loop through each device, print out temperature data
for(int i=0;i<numberOfDevices; i++)
// Search the wire for address
if(sensors.getAddress(tempDeviceAddress, i))
// Output the device ID
Serial.print("Temperature for device: ");
// It responds almost immediately. Let's print out the data
printTemperature(tempDeviceAddress); // Use a simple function to print out the data
//else ghost device! Check your power requirements and cabling
// function to print a device address
void printAddress(DeviceAddress deviceAddress)
for (uint8_t i = 0; i < 8; i++)
if (deviceAddress[i] < 16) Serial.print("0");
Serial.print(deviceAddress[i], HEX);