Adafruit
Adafruit AHT20 - Temperature Humidity Sensor Breakout Board - STEMMA QT / Qwiic
The Adafruit AHT20 is an affordable I2C temperature and humidity sensor from the makers of the popular DHT22. It delivers reliable readings with standard I2C...
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The Adafruit AHT20 is an affordable I2C temperature and humidity sensor from the makers of the popular DHT22. It delivers reliable readings with standard I2C communication, making it easy to use with any Arduino, Raspberry Pi or other microcontroller.
This STEMMA QT version features solderless connectors for plug-and-play setup — just connect a STEMMA QT cable and start reading data immediately. No soldering required.
Key Features
- Humidity Sensor – ±2% relative humidity typical accuracy
- Temperature Sensor – ±0.3°C typical accuracy
- I2C Interface – Standard I2C communication, compatible with Arduino and CircuitPython
- STEMMA QT / Qwiic Connectors – Solderless I2C connection on both sides for daisy-chaining
- Continuous Reading – Take sensor readings as often as needed
Ideal For
- Indoor environmental monitoring
- Weather stations
- HVAC and climate control projects
- Data logging applications
Package Contents
- 1× Adafruit AHT20 Temperature & Humidity Sensor Breakout with STEMMA QT
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.
- 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.
- I2C address
- An I2C address is the number a device uses so a microcontroller can tell it apart from other devices on the same I2C bus. It matters because two devices with the same fixed address may conflict if used together.
- microcontroller
- A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
- 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.
- 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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