Get the Serial Number of a DS18B20 With an Arduino

1. Open Arduino IDE (I am using 1.8.1)
2. Click "Sketch" -> "Include Library" -> "Manage Libraries..."
3. Select the search bar and type "dallas"
4. Click "DallasTemperature" and click "Install"

Alternatively you can download the Library from here: https://github.com/milesburton/Arduino-Temperature...

This Library includes the OnWire Library.

Using a bread board connect +5V, GND and Digital Pin 2 (Pin 2 is already set in the example sketch) from the Arduino using Male to Male breadboard jumpers.

Connect the DS18B20 parallel to the 3x terminal strips on the breadboard.

• Pin 1 (GND) -> GND (Ground 0V)
• Pin 2 (DATA) -> Digital Pin 2
• Pin 3 (Vdd) -> +5V

For Normal Power Mode connect a 4.7K Resistor from +5V to Digital Pin 2 wire on the breadboard.

The following link is a great resource for the DS18B20 1-wire temperature sensor.

https://www.tweaking4all.com/hardware/arduino/ardu...

Once you have it wired up you are ready to load the Dallas Temperature "Single" Sketch



Open Arduino IDE (I am using 1.8.1)

Click "File" -> "Examples" -> "Dallas Temperature" -> "Single"

I added in delay(5000); on line 103 to give me time to copy the serial number

Select your appropriate board form "Tools" -> "Board"

Select your appropriate port "Tools" -> "Port"

Now "Upload" the Sketch "Sketch" -> "Upload"

Click "Tools" -> "Serial Monitor" make sure the baud rates match mine is 9600



If you sketch did not upload check your Board, Port, USB drivers etc.

From the "Serial Monitor" you will see the 4th line is "Device 0 Address: xxxxxxxxxxxxxxxx"

This is the Serial Number of the DS18B20

If it is "0000000000000000" then there is an issue reading your DS18B20.

Highlight it with your mouse and press CTRL+C on you keyboard then past it in Notepad

For my other projects my code uses an array of these numbers. I reformatted the HEX string to the following format.

DeviceAddress tempSensorSerial[9]= {

{0x28, 0xFF, 0x07, 0xA6, 0x70, 0x17, 0x04, 0xB5}, {0x28, 0xFF, 0xB2, 0xA6, 0x70, 0x17, 0x04, 0x28}, {0x28, 0xFF, 0x42, 0x98, 0x70, 0x17, 0x04, 0xD3}, {0x28, 0xFF, 0x86, 0xA8, 0x70, 0x17, 0x04, 0xA6}, {0x28, 0xFF, 0x2B, 0x65, 0x71, 0x17, 0x04, 0x76}, {0x28, 0xFF, 0x66, 0x62, 0x71, 0x17, 0x04, 0xF5}, {0x28, 0xFF, 0xD9, 0x9B, 0x70, 0x17, 0x04, 0x9C}, {0x28, 0xFF, 0x98, 0x6A, 0x71, 0x17, 0x04, 0xED}, {0x28, 0xFF, 0x99, 0x42, 0x71, 0x17, 0x04, 0x4C} };

Now you can identify each individual DS18B20 1-wire temperature sensor in your code and use a function like this:

float getTemperature(byte j)
{

sensors.requestTemperaturesByAddress(tempSensorSerial[j]);

float tempC = sensors.getTempC(tempSensorSerial[j]);

return tempC;

}

Check out my simple example sketch

Attachments

• Multiple_DS18B20.ino
  Download