Adafruit
Adafruit HTU21D-F Temperature Humidity Sensor Breakout Board - Fully Assembled
The Adafruit HTU21D-F is an accurate I²C digital temperature and humidity sensor breakout board. With typical humidity accuracy of ±2% (optimised for 5–95% R...
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The Adafruit HTU21D-F is an accurate I²C digital temperature and humidity sensor breakout board. With typical humidity accuracy of ±2% (optimised for 5–95% RH) and temperature accuracy of ±1°C across -30 to 90°C, it's a reliable and affordable choice for environmental monitoring projects.
This breakout uses the filtered version of the HTU21D (the "F"), which includes a PTFE filter to protect the sensor element from dust and contaminants. On-board 3.3V regulation and I²C level shifting make it compatible with both 3.3V and 5V microcontrollers — no external components needed.
Key Features
- ±2% Typical Humidity Accuracy – Optimised for 5–95% RH operating range
- ±1°C Temperature Accuracy – Over -30 to 90°C range
- I²C Interface – Simple two-wire digital communication
- PTFE Filtered Sensor – Protects against dust and contaminants for reliable long-term readings
- 3.3V and 5V Compatible – On-board voltage regulation and I²C level shifting
- Fully Assembled – Headers pre-soldered, ready to plug into a breadboard immediately
- Arduino Library and Tutorial – Easy setup with example code
Ideal For
- Indoor climate and weather monitoring
- HVAC and environmental control systems
- Greenhouse and grow room humidity tracking
- Beginner-friendly sensor projects — no soldering required
Package Contents
- 1× Adafruit HTU21D-F Breakout Board – Fully assembled and tested with headers attached
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- breakout
- A breakout board carries a small or fine-pitched component and brings its connections out to standard, breadboard- and header-friendly pins. Describing a part as a breakout means it can be wired into a project without soldering directly to the component's tiny contacts.
- Headers
- Rows of connector contacts on a fixed pitch (commonly 2.54 mm) used to link a board to a breadboard, jumper wires, or another board. They come as male pin headers and female socket headers; when a module ships with pre-soldered headers it can be used straight away, whereas bare pads require soldering the pins yourself.
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