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% 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

• Adafruit HTU21D-F Learn Guide