The Adafruit SHT41 Trinkey is a compact USB temperature and humidity sensor designed to easily connect to any computer or laptop with a USB A port. Featuring the highly accurate Sensirion SHT41 sensor, it provides precise environmental measurements with 1.8% relative humidity accuracy and 0.2C temperature accuracy. This device includes an ATSAMD21 32-bit Cortex M0+ microcontroller supporting CircuitPython and Arduino, a NeoPixel LED, a capacitive touchpad, and a reset button for bootloader mode.

Key benefits:

• Simple plug-and-play USB design requiring no additional wiring, soldering, or drivers
• Pre-programmed to output temperature, humidity, touch sensor, and unique serial number over USB serial COM port in CSV format
• Compatibility with Arduino IDE and CircuitPython libraries for easy development
• Compact and durable for portable or keychain use

Perfect for quick environmental monitoring and integration into various projects.

Features

• ATSAMD21E18 Cortex M0+ 32-bit processor at 48 MHz with 256KB Flash and 32KB RAM
• Native USB support for serial console, MIDI, HID keyboard/mouse, and file storage
• NeoPixel RGB LED and capacitive touchpad inputs
• Highly accurate Sensirion SHT41 Temperature + Humidity sensor
• Thermal isolation cutout for sensor accuracy
• Reset button for restarting code or entering bootloader mode
• Slim, keychain-friendly form factor

Technical Specifications

• SHT41 Sensor Accuracy: 1.8% RH typical (relative humidity), 0.2C typical (temperature)
• Supply Voltage: 3.3V to 5V
• Sensor Idle Current: 80 nA; Average Meas. current: 0.4 A at 1 Hz
• Operating Range: 0 to 100% RH; -40 to 125 C
• I2C Address: 0x44
• Dimensions: 31.8 mm 11.8 mm 4.5 mm
• Weight: 1.6 g
• Compliance: RoHS 2 2011/65/EU, RoHS 2 2015/863/EU

The Adafruit SHT41 Trinkey is a unique combination of a USB key and a temperature-humidity sensor, designed for easy integration into any computer with a USB A port. This compact device features a PCB that fits into a USB A port, with an ATSAMD21 microcontroller onboard to manage its functions. It has a NeoPixel LED, a capacitive touch input on its end, and a reset button for entering bootloader mode.

The SHT41 Trinkey can run CircuitPython or Arduino, with support for libraries like SHT4x, NeoPixel, and FreeTouch for capacitive touch. Through its USB connection, it offers serial, MIDI, or HID communication options. The main highlight is the SHT41 sensor from Sensirion, known for its high accuracy in temperature and humidity measurements. The sensor offers 1.8% typical humidity accuracy between 25 and 75% relative humidity and 0.2C typical temperature accuracy from 0 to 75C, though some self-heating may affect temperature readings.

This Trinkey is perfect for simple projects needing quick, no-fuss temperature and humidity readings, with no extra wiring, soldering, or drivers required. It even comes pre-programmed to output temperature, humidity, and touch sensor data in CSV format over serial. For extended measurements, you can use a USB A extension cable.

The SHT41 Trinkey is ideal for beginner microcontroller users or experienced developers looking for a fun, easy project. For those needing even more precision, the SHT45 Trinkey offers better accuracy with 1.0% relative humidity and 0.1C temperature accuracy.

Key Features:

• ATSAMD21E18 32-bit Cortex M0+ processor (48 MHz)
• Native USB support for Arduino or CircuitPython (serial, MIDI, HID)
• One RGB NeoPixel LED
• One Capacitive Touchpad
• SHT41 Temperature and Humidity sensor
• Reset switch for code reboot or bootloader mode
• Compact and keychain-friendly design

With its small size, durability, and ease of use, the SHT41 Trinkey is a versatile tool for all levels of developers.