Adafruit
Adafruit HTU21D-F Temperature Humidity Sensor Breakout Board
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...
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
- 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
Package Contents
- 1× Adafruit HTU21D-F Breakout Board – Fully assembled and tested with PTFE filter
- 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.
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