The Adafruit SHT41 Trinkey combines the functionality of a USB key with a high-accuracy temperature and humidity sensor, making it effortless to add environmental sensing capabilities to any device with a USB A port.

Features:

1. Designed to fit seamlessly into any USB A port on computers or laptops, featuring an ATSAMD21 microcontroller with minimal circuitry for efficient operation.
2.  Supports CircuitPython or Arduino programming, offering serial, MIDI, or HID connectivity over USB.
3. Integrated Components:
   One RGB NeoPixel LED for visual feedback.
   Capacitive touchpad for user input.
   Reset switch for easy bootloader mode entry.
   
   
   
4. Features the Sensirion SHT41 sensor, renowned for its exceptional ±1.8% RH humidity accuracy and ±0.2°C temperature accuracy, ensuring precise environmental measurements.
5. Comes pre-programmed with code to output temperature, humidity, and touch sensor data in CSV format over a serial/COM port, enabling immediate use without additional setup.
6. Compact and durable design makes it suitable for various applications, while its keychain-friendly size adds to its portability.

Specifications:

1. ATSAMD21E18 Microcontroller: 32-bit Cortex M0+ processor with 256KB Flash and 32 KB RAM, supporting native USB functionality for versatile connectivity options.
2. SHT41 Sensor Specifications:
   Relative humidity accuracy: up to ±1.8 %RH.
   Temperature accuracy: up to ±0.2 °C.
   Operating range: 0…100 %RH, -40…125 °C.
   
3. I2C fast mode plus with CRC checksum.
4. Variable power heater for enhanced functionality.
5. Power Requirements: Operates within a voltage range of 3.3 to 5V, with low average and idle bare sensor currents for efficient power consumption.

Useful link:

https://learn.adafruit.com/adafruit-sht4x-trinkey

Package Includes:

1 x Adafruit SHT41 Trinkey – USB Temperature and Humidity Sensor