Adafruit
Adafruit Si7021 Temperature Humidity Sensor Breakout Board
The Adafruit Si7021 is a temperature and humidity sensor from Silicon Labs with a PTFE filter for protection against dust and contaminants. It provides ±3% r...
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The Adafruit Si7021 is a temperature and humidity sensor from Silicon Labs with a PTFE filter for protection against dust and contaminants. It provides ±3% relative humidity accuracy over 0–80% RH and ±0.4 °C temperature accuracy from −10 to +85 °C, all communicated over a simple I2C interface.
The breakout includes a 3.3 V regulator and level shifting, making it compatible with both 3.3 V and 5 V power and logic. Some light soldering is required to attach the included header.
Key Features
- Relative Humidity Accuracy – ±3% RH (0–80% RH range)
- Temperature Accuracy – ±0.4 °C (−10 to +85 °C range)
- PTFE Filter – Protects the sensor from dust while allowing accurate humidity readings
- I2C Interface – Simple two-wire communication
- 3.3 V / 5 V Compatible – Onboard voltage regulator and level shifting
Also Consider
- SHT40 Sensor – Newer Sensirion sensor with ±1.8% RH accuracy and STEMMA QT connectors
- SHT45 Sensor – Highest precision with ±1.0% RH and ±0.1 °C accuracy
Ideal For
- Environmental monitoring and weather stations
- HVAC and climate control systems
- Indoor comfort monitoring
- Data logging projects
Package Contents
- 1× Adafruit Si7021 Temperature & Humidity Sensor Breakout (with PTFE filter)
- 1× Header strip (soldering required)
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.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- 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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