Adafruit
Adafruit HTU31 Temperature & Humidity Sensor Breakout Board
The Adafruit HTU31 is a third-generation I²C temperature and humidity sensor from TE, offering improved accuracy and useful extras over its predecessor, the ...
The Adafruit HTU31 is a third-generation I²C temperature and humidity sensor from TE, offering improved accuracy and useful extras over its predecessor, the HTU21D. With typical humidity accuracy of ±2% (at 20–100% RH, 0–70°C) and temperature accuracy of ±0.2°C (0–100°C), it delivers reliable environmental readings for a wide range of projects.
The breakout comes in the STEMMA QT form factor with Qwiic-compatible I²C connectors on both sides for solderless daisy-chaining. On-board voltage regulation and level shifting support both 3.3V and 5V systems. An address-select pin allows two sensors on one I²C bus, and a thermal-isolation cutout minimises the effect of nearby circuitry on readings.
Key Features
- ±2% Typical Humidity Accuracy – At 20–100% RH, 0–70°C operating range
- ±0.2°C Typical Temperature Accuracy – Over 0 to 100°C range
- I²C Interface with CRC Data Verification – More confident data reads compared to other I²C sensors
- On-Board Heater – Controllable heater to evaporate condensation on the sensing element
- Hardware Reset Pin – Reliable sensor reset without power cycling
- Address-Select Pin – Run two HTU31 sensors on one I²C bus
- Thermal-Isolation Cutout – Reduces heat interference from nearby components
- STEMMA QT / Qwiic Connectors – Solderless I²C connection
- 3.3V and 5V Compatible – On-board voltage regulation and level shifting
Ideal For
- Precision environmental monitoring
- Indoor climate and HVAC systems
- Multi-sensor networks with two sensors per I²C bus
- Condensation-prone environments (using the built-in heater)
Package Contents
- 1× Adafruit HTU31 Breakout Board – Assembled and tested with STEMMA QT connectors
- 1× Header strip (unsoldered)
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- breakout
- A breakout is a small circuit board that makes a tiny or hard-to-solder component easier to connect to with standard pins. It matters because this OLED module can be wired into a microcontroller project without needing to solder directly to the display’s fine contacts.
- Qwiic
- Qwiic is a plug-in connector system for I2C devices that uses small 4-pin cables, so you can connect compatible sensors without soldering. It matters because your controller or adapter also needs Qwiic, or you will need a cable or breakout to wire it up.
- STEMMA
- A plug-and-cable connection system used on some maker electronics boards to make wiring simpler. If a product uses STEMMA, you need the matching cable or connector type to plug it in without soldering.
- STEMMA QT
- A small plug-in connector system for I2C boards that lets you connect compatible sensors and controllers without soldering. It matters because it can make wiring faster and less error-prone, especially when adding several small modules to a project.
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