Arduino plug and go library for the Maxim (previously Dallas) DS18B20 (and similar) temperature ICs
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Arduino Library for Maxim Temperature Integrated Circuits


This library supports the following devices :

  • DS18B20
  • DS18S20 - Please note there appears to be an issue with this series.
  • DS1822
  • DS1820
  • MAX31820

You will need a pull-up resistor of about 5 KOhm between the 1-Wire data line and your 5V power. If you are using the DS18B20, ground pins 1 and 3. The centre pin is the data line '1-wire'.

We have included a "REQUIRESNEW" and "REQUIRESALARMS" definition. If you want to slim down the code feel free to use either of these by including




at the top of DallasTemperature.h

Finally, please include OneWire from Paul Stoffregen in the library manager before you begin.


The OneWire code has been derived from Miles Burton originally developed this library. Tim Newsome added support for multiple sensors on the same bus. Guil Barros [] added getTempByAddress (v3.5) Note: these are implemented as getTempC(address) and getTempF(address) Rob Tillaart [] added async modus (v3.7.0)


You can find the latest version of the library at


This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA