![]() ![]() requestTemperatures() // Send the command to get temperatures Serial. call sensors.requestTemperatures() to issue a global temperature // request to all devices on the bus Serial. println( "Dallas Temperature IC Control Library Demo") Pass our oneWire reference to Dallas Temperature. (not just Maxim/Dallas temperature ICs) OneWire oneWire(ONE_WIRE_BUS) ![]() Setup a oneWire instance to communicate with any OneWire devices Data wire is plugged into pin 2 on the Arduino Using the Dallas Temperature Library makes getting the temperature easy. Next, load up the sketch below and upload it to your Arduino board. The orange wire is our signal wire to pin 2 on the Arduino, and there is a 4K7 pullup resistor to 5V The brown wire connects pins 1 and 3 together, and the black wire connects them both to 0V. Then connect the DQ pin to pin 2 on the Arduino board (can be any Arduino digital pin)Ī 4K7 ohm pullup resistor is required on the DQ pin to pull it up to 5V Simply connect both the GND and VDD pins to 0V (yes both). ![]() This makes it great for use as an external sensor. However, the DS18B20 can also extract its power from the data line which means we only effectively need two wires to connect it up. The DS18B20 can be powered by between 3.0V and 5.5V so you can simply connect its GND pin to 0V and the VDD pin to +5V from the Arduino. Now, before we get to the programming part, lets wire up our temperature sensor. If you dont already have the OneWire library then you will need to copy that folder into the libraries folder also. In it you will find two foldersĭrag and drop the DallasTemperture folder into your arduino/libraries folder ![]() The most recent version of this library can be found atĭownload a copy of the library. Luckily, there is a Dallas Temperature library for the arduino which makes using this sensor very easy. The one wire Digital Temperature Sensor - DS18B20 from Maxim (formerly Dallas) is a great chip for measuring temperature in your projects. Arduino - One Wire Digital Temperature Sensor - DS18B20 ![]()
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