About Humidity Tag

The Humidity Tag uses a high-accuracy humidity sensor SHT20 with a typical accuracy of ±3 % from 20 % to 80 %. This sensor is digital and calibrated. It communicates using an I²C bus and features a very low power operation and shutdown mode.


Relative humidity is the essential attribute of the environment we live in. The recommended indoor range is between 30 % and 60 %.

Values below this range (dry air) can lead to various health issues. On the other hand, the values above this range may result in troubles with moisture.



SDK Library

Header File

Source File



  • Integrated humidity sensor SHT20 (Sensirion)

  • Communication using I²C bus

  • Measurement range: 0 % to 100 %

  • Measurement accuracy: ±2 %

  • Optional interrupt output

  • Operating current: 10 µA

  • Operating voltage range: 1.8 V to 3.3 V

  • Operating temperature range: -40 to 125 °C

  • Mechanical dimensions: 16 x 16 mm