FaBoHumidity-HTS221-Library This is a library for the FaBo #208 Humidity I2C Brick. FaBo Humidity I2C Brick #208 Humidity I2C Brick HTS221 HTS221 is STMicroelectronics's mems sensor for Humidty and Temperatures. HTS221 Datasheet HTS221 Datasheet Releases 1.0.0 Initial release. How to install. Installing Additional Arduino Libraries