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Adafruit HTS221 Temperature and Humidity Sensor Breakout Board is designed around the ST HTS221, a capacitive digital humidity, and a temperature sensor. The device allows the user to take measurements of the relative humidity. The HTS221 can measure relative humidity from 0%-100% RH with a sensitivity of 0.004% and 3.5% and accuracy between 20 to 80%. It can also measure temperature from -40°C to 120°C, with a resolution of 0.016°C with ±0.5°C accuracy between +15°C and +40°C.
The HTS221 is an inexpensive humidity sensor which makes it great for everyday measurement applications. The device lets the user choose between a 3-wire SPI or the ever-popular I2C, which only needs two wires for data. If the user decides to use I2C, the SparkFun Qwiic compatible STEMMA QT connectors are included, so solder is unnecessary. Since the HTS221 is a super small 2mm square, it has been put in a breakout board with level shifting and a power regulator. This makes it easy to use on a breadboard with a 5V logic level device like a Metro 328 or Arduino Uno or with 3.3V logic level devices like a Feather M4 or Raspberry Pi of the user’s choice.
Adafruit has created libraries for Arduino and CircuitPython or Python. These libraries also include written example code and instructions. These allow the user to determine the approximate relative humidity level and temperature in only a few minutes.
