Adafruit’s Trinkey is A Thumb-Drive-Sized Temperature and Humidity Sensor

Adafruit has recently added two new members to the Trinkey family, the Adafruit SHT45 Trinkey and the Adafruit SHT41 Trinkey both of those are designed to add temperature and humidity-sensing capabilities to any USB HOST device.

The main difference between the two boards lies in their accuracy and cost. The SHT45 Trinkey offers higher precision, with ±1.0% RH accuracy from 25 to 75% and ±0.1°C temperature accuracy from 0 to 75°C. The SHT41 Trinkey provides ±1.8% RH accuracy from 25 to 75% and ±0.2°C temperature accuracy from 0 to 75°C.

Both the boards are designed around a Microchip ATSAMD21E18 microcontroller. They are designed to slip into any USB A port on a computer or laptop. Additionally, they feature a NeoPixel LED, capacitive touch input, and a reset button, with minimal extra circuitry for streamlined operation.

The boards are designed for seamless use with any USB host device and automatically present temperature, and humidity data to the host device. It can also provide data in CSV format via a virtual serial port upon connection. Their compatibility with various USB-host devices extends beyond PCs and Raspberry Pis, thanks to using a standard USB profile.

Adafruit Trinkey USB Temperature and Humidity Sensor Specifications

• MCU: ATSAMD21E18, 32-bit Cortex M0+, 48 MHz, 256KB Flash, 32 KB RAM
• Connectivity: Native USB, supports serial console, MIDI, Keyboard/Mouse HID, disk drive for Python scripts
• Compatibility: Arduino IDE, CircuitPython
• LED: 1x RGB NeoPixel
• Input: Capacitive Touchpad
• Sensors: SHT41 Temperature + Humidity sensor with thermal isolation
• Utility: Reset switch for code restart or bootloader mode
• Design: Slim, keychain-friendly

Reprogramming the USB Temperature and Humidity Sensor Trinkey is easy. Adafruit provides CircuitPython and Arduino IDE libraries for all Trinkey components, allowing for customization of data output, format, or functionality.

Adafruit offers two versions of the USB Temperature and Humidity Sensor Adafruit Trinkey – one with the SHT41 sensor named SHT41 Trinkey sells for $10.95 and a more accurate version with the SHT45 sensor named SHT45 Trinkey sells for $17.95.

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