Adafruit
Adafruit Sensirion SHT40 Temperature Humidity Sensor - STEMMA QT / Qwiic
The Adafruit Sensirion SHT40 is a high-accuracy temperature and humidity sensor featuring a true I2C interface for simple two-wire communication. Part of the...
The Adafruit Sensirion SHT40 is a high-accuracy temperature and humidity sensor featuring a true I2C interface for simple two-wire communication. Part of the fourth generation of Sensirion's acclaimed SHT sensor family, it delivers excellent measurement precision in a compact, easy-to-use breakout.
The breakout includes a voltage regulator and level shifting, making it compatible with both 3.3 V and 5 V systems. STEMMA QT / Qwiic connectors allow solderless hookup, and Arduino and CircuitPython libraries are available for quick integration.
Key Features
- Relative Humidity Accuracy – ±1.8% RH typical (25–75% RH)
- Temperature Accuracy – ±0.2 °C typical (0–75 °C)
- Operating Range – 0–100% RH, −40 to +125 °C; fully functional in condensing environments
- True I2C Interface – Address 0x44, fast mode plus with CRC checksum
- Ultra-Low Power – 0.4 µA average at 1 Hz measurement rate, 80 nA idle
- Variable Power Heater – Built-in heater for defogging and self-testing
- 3.3 V / 5 V Compatible – Onboard voltage regulator and level shifting
- STEMMA QT / Qwiic Connectors – Solderless I2C connection and daisy-chaining
- NIST Traceable – Calibrated with NIST traceability; JEDEC JESD47 qualified
Ideal For
- Environmental monitoring and weather stations
- HVAC and climate control systems
- Indoor air quality and comfort monitoring
- Data logging and scientific experiments
Package Contents
- 1× Adafruit Sensirion SHT40 Temperature & Humidity Sensor Breakout
- 1× Header strip (soldering required for breadboard use)
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.
- CircuitPython
- A beginner-friendly version of Python designed to run directly on microcontroller boards. If a product supports CircuitPython, you can often program it by copying code files onto the board rather than setting up a more complex toolchain.
- 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.
- NIST traceability
- A way of linking a measurement back to standards maintained by the US National Institute of Standards and Technology. For temperature sensing, it matters when you need documented confidence that readings can be compared to recognised measurement standards.
- 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.
- SHT40
- SHT40 is a Sensirion temperature and humidity sensor included on the module. It matters because the board can report room temperature and humidity as well as use those readings to improve the CO₂ measurement.
- 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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