The output in the debug window will look something like this: The code below uses the OneWire Library to conveniently go through all connected DS28B20 temperature sensors (see how to connect multiple sensors at the end of this article) and checks the details of each of them, to then display the data in the debug window (menu: “ Tools” “ Serial Monitor“). Go to “ File” “ Examples” “ OneWire” and select the “ DS18x20_Temperature” example, which will look like the code below. If you installed the OneWire Library, the you’ll find it in the examples. The following Sketch comes with OneWire, so you’ll find it in the ZIP file. To find the examples files in the menu’s, you might need to restart the Arduino IDE. The Arduino IDE can’t seem to find the proper directory name in the ZIP file, so the easiest then is to unzip the file, make sure the directory is called “OneWire” (which holds the “examples” directory and a bunch of files) and drag it into the library directory of your Arduino IDE. From the menu, choose “ Sketch” “ Import Library” “ Add Library” and select the ZIP file you downloaded. If you downloaded the ZIP file from either OneWire Project Page from Tweaking 4All, then you should be able to use the Library Import option in the Arduino IDE software. Make sure that you very line 10 and line 65 in the Sketch below to match your data pin and power mode!Īrduino Sketch for Measuring Temperature Installing the OneWire Library The wiring presented below is the regular way of wiring the DS18B20 with your Arduino. I have seen ther values, but it seems this is the most commonly used value. The only thing we need to add is a pull-up resistor of 4.7 KΩ. The Data pin of the DS18B20 goes to a (digital) pin of your choice on the Arduino, in this example I used Pin 2. The Vdd pin of the DS18B20 goes to +5V on the Arduino. The GND pin of the DS18B20 goes to GND on the Arduino.
The wiring, this is the beauty of a 1-wire interface, is super simple. When we run the Arduino computer independent you might want to look for a suitable power supply. The USB cable is of course only needed to program and power the Arduino during development. Breadboard (see our Breadboard article).An Arduino (I used an Uno R3 – for example from Amazon, eBay, Arduino or AdaFruit).At least one DS18B20 digital temperature sensor (from Amazon, AdaFruit or eBay for example).
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