Adafruit SHT41 Trinkey - USB Temperature & Humidity Sensor Module

Name: Adafruit SHT41 Trinkey - USB Temperature &amp; Humidity Sensor Module
Brand: Adafruit
SKU: SENS-3427
Price: 1619.00 INR
Availability: OutOfStock

₹1,619.00 (Inclusive of all taxes)

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The Adafruit SHT41 Trinkey is a USB-A keychain module integrating a high-precision Sensirion SHT41 sensor for temperature and humidity monitoring, programmable via CircuitPython or Arduino for serial, MIDI, or HID connectivity with any computer or embedded host.

Features

Integrates Sensirion SHT41 sensor with ±0.2°C temperature and ±1.8% RH humidity accuracy.
ATSAMD21E18 32-bit Cortex M0+ MCU with native USB for serial, MIDI, or HID communication.
Plug-and-play USB-A form factor with pre-loaded CSV data logger code for immediate use.
Includes RGB NeoPixel LED, capacitive touchpad, and reset switch for interactive projects.
Wide operating range: -40 to 125°C and 0 to 100% RH for robust environmental sensing.

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Description

The Adafruit SHT41 Trinkey combines a USB-A interface with a high-performance Sensirion SHT41 digital humidity and temperature sensor. The module is built around an ATSAMD21E18 microcontroller, providing native USB connectivity for easy integration as a serial data logger, MIDI controller, or HID device. Its compact, keychain-sized design makes it ideal for portable environmental monitoring applications.

The SHT41 sensor utilizes a capacitive polymer sensing element for humidity and a band-gap temperature sensor, communicating via I2C Fast Mode Plus with CRC data integrity checks. The integrated variable power heater allows for diagnostics and dew point calculation. The module operates from the USB bus voltage (3.3V to 5V) and features low power consumption, making it suitable for continuous monitoring tasks on laptops, single-board computers, or industrial control systems.

Key Features

High-precision Sensirion SHT41 environmental sensor with factory-calibrated output.
ATSAMD21E18 microcontroller with 256KB Flash and 32KB RAM for flexible firmware development.
Native USB support enables multiple device classes: serial COM port, MIDI, or Human Interface Device (HID).
Onboard user interface includes an RGB NeoPixel LED for status indication and a capacitive touchpad for input.
Pre-programmed with CircuitPython firmware to output real-time temperature, humidity, and touch data in CSV format.
Robust operating range from -40°C to 125°C and 0% to 100% relative humidity for demanding environments.
Compact and durable keychain form factor with a USB-A plug for tool-free deployment.
Open-source software and hardware design supported by the Adafruit ecosystem and extensive documentation.

Applications

Portable environmental data logging for fieldwork or lab experiments via USB-connected laptops.
Embedded climate monitoring in network cabinets, server rooms, or IoT gateways with USB host ports.
Interactive educational tools for teaching programming, data visualization, and sensor fundamentals.
Prototyping user interfaces combining environmental sensing with capacitive touch and LED feedback.
Condition monitoring add-on for industrial PCs and PLCs requiring precise temperature and humidity inputs.

Technical Specifications

Core Sensor	Sensirion SHT41
Temperature Accuracy	±0.2 °C
Temperature Range	-40 to 125 °C
Humidity Accuracy	±1.8 %RH
Humidity Range	0 to 100 %RH
Microcontroller	ATSAMD21E18 (Cortex-M0+)
Flash / RAM	256 KB / 32 KB
Communication Interface	Native USB (Serial, MIDI, HID), Sensor I2C
User Interface	RGB NeoPixel LED, Capacitive Touchpad, Reset Button
Supply Voltage	3.3V to 5V via USB Bus
Programming Support	CircuitPython, Arduino
Dimensions (Shipping)	90 x 70 x 30 mm
Weight (Shipping)	0.010 kg

Frequently Asked Questions

What is the operating voltage range for the SHT41 Trinkey?

The module is powered directly from the USB bus, accepting a voltage range of 3.3V to 5V DC. It contains all necessary voltage regulation and level shifting internally, requiring no external power supply when plugged into a standard USB-A host port.

How do I read data from the SHT41 Trinkey?

When plugged in, the pre-loaded CircuitPython code presents the board as a serial COM port. You can use any terminal program (e.g., PuTTY, screen, Arduino Serial Monitor) to read a continuous CSV stream of temperature (°C), humidity (%RH), and touchpad state. For custom applications, the board can be reprogrammed via the bootloader using the Arduino IDE or CircuitPython.

Can I use this sensor with systems that don't have a USB port, like an Arduino Uno?

No, the SHT41 Trinkey is designed as a USB device. Its sensor is connected to the internal ATSAMD21 microcontroller's I2C pins, not broken out externally. For direct I2C connection to a 3.3V or 5V microcontroller, consider a standard SHT41 breakout board instead.

What is the purpose of the capacitive touchpad and NeoPixel LED?

The capacitive touchpad provides a simple user input that can be read via the serial data stream or programmed to trigger events. The RGB NeoPixel LED offers visual feedback for status, sensor readings, or touch events, enhancing interactivity for prototypes and finished projects.