Adafruit
Adafruit SHT41 Trinkey - USB Temperature and Humidity Sensor
· MPN: ADA5912
The Adafruit SHT41 Trinkey is a tiny USB A device that combines an ATSAMD21 microcontroller with a Sensirion SHT41 temperature and humidity sensor. Simply pl...
The Adafruit SHT41 Trinkey is a tiny USB A device that combines an ATSAMD21 microcontroller with a Sensirion SHT41 temperature and humidity sensor. Simply plug it into any USB A port on your computer and start reading environmental data — no wiring, soldering, or driver installation required.
The board ships pre-programmed to output a unique serial number, temperature, humidity, and capacitive touch data over a serial/COM port in CSV format, so it works straight out of the box. Reprogram it with CircuitPython or Arduino to customise the behaviour, add HID or MIDI functionality, or create your own sensor applications.
Key Features
- SHT41 Sensor – ±1.8% RH typical accuracy (25–75% RH) and ±0.2 °C typical temperature accuracy (0–75 °C)
- ATSAMD21E18 Processor – 48 MHz Cortex M0+ with 256 KB flash and 32 KB RAM
- USB A Plug – Plugs directly into any computer's USB port, no cable needed
- Pre-Programmed – Ships with CSV serial output of temperature, humidity, and touch data
- NeoPixel LED – Single RGB LED for visual feedback
- Capacitive Touch Pad – One touch input on the end of the board
- Native USB – Serial, MIDI, and HID (keyboard/mouse) support
- CircuitPython & Arduino – Full library support for SHT4x, NeoPixel, and FreeTouch
- Thermal-Isolation Cutout – PCB cutout reduces heat transfer from USB port to sensor
Also Consider
- SHT41 Breakout – Standalone SHT41 sensor with STEMMA QT for use with any microcontroller
Ideal For
- Quick desktop temperature and humidity monitoring
- Data logging without additional hardware
- Environmental monitoring for server rooms or offices
- Simple USB sensor projects and prototyping
Package Contents
- 1× Adafruit SHT41 Trinkey (pre-programmed, ready to use)
Jargon buster
Plain-language definitions for the technical terms used above.
- 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.
- COM port
- A COM port is the way many computers present a USB-connected serial device to software. It matters because it lets you configure or read the board from a computer using serial terminal tools or navigation software.
- HID
- Human Interface Device is a USB device class used for keyboards, mice, gamepads and similar controls. If a board supports HID over USB, it can act like an input device to a computer without needing a custom driver.
- LED
- A light-emitting diode is a small electronic component that lights up when current flows through it in the correct direction. In this kit, LEDs create the flashing effect, so polarity and correct soldering matter for the project to work.
- microcontroller
- A microcontroller is a small computer on a chip that runs your program and controls connected inputs and outputs. For this product, it is the part that reads buttons and sensors, drives the display and speaker, and communicates over Bluetooth.
- MIDI
- MIDI is a standard way for electronic instruments, controllers, and software to send musical control messages such as notes, velocity, and timing. If a board supports MIDI, it can be triggered from keyboards, drum pads, sequencers, or other music gear rather than only from buttons or code.
- native USB
- Native USB means the microcontroller itself handles USB communication, rather than using a separate USB-to-serial chip. This matters for programming, debugging, and projects that need the board to act directly as a USB device.
- NeoPixel
- A type of addressable LED system where colour data is sent along a single digital data line from one LED or controller to the next. Compatibility matters because the timing and signal format must match for the lights or driver board to respond correctly.
- PCB
- A printed circuit board is a rigid board with copper tracks that connect electronic parts without loose wires. For this kit, the PCBs also form the airplane shape, so they are both the circuit base and part of the finished model.
- RAM
- RAM is temporary memory used while a device is running, and its contents are lost when power is removed. A “Run in RAM” mode is useful for testing settings without permanently programming the module, but it may not support every feature.
- RGB
- Short for red, green and blue, usually referring to an LED that can mix those three colours. It matters because controlling an RGB LED teaches how separate outputs combine to create different colours.
- 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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