Adafruit SHT41 Trinkey - USB Temperature and Humidity Sensor

SKU: ADA5912 Brand: Adafruit

It's half USB Key, half temperature-humidity sensor... it's the Adafruit SHT41 Trinkey. We wanted to make it super-easy to add one of our most...

$21.95 AUD, inc GST

$19.95 AUD, exc GST

Available with a lead time
Expect dispatch between Jun 06 and Jun 10

Quantity Discounts:

10+ $19.15 (exc GST)
25+ $18.55 (exc GST)

It's half USB Key, half temperature-humidity sensor... it's the Adafruit SHT41 Trinkey. Adafruit wanted to make it super-easy to add one of Adafruit's most popular combination environmental sensors to any computer with a USB A port.

The PCB is designed to slip into any USB A port on a computer or laptop. There's an ATSAMD21 microcontroller on board with just enough circuitry to keep it happy. One pin of the microcontroller connects to a NeoPixel LEDs. Another pin is used as a capacitive touch input on the end. A reset button lets you enter bootloader mode if necessary. That's it!

The SAMD21 can run CircuitPython or Arduino very nicely - both have existing SHT4x, NeoPixel and Adafruit's FreeTouch (capacitive touch) libraries. Over the USB connection, you can have serial, MIDI, or HID connectivity.

The star of this Trinkey is the SHT41 from Sensirion. Sensirion Temperature/Humidity sensors are some of the finest & highest-accuracy devices you can get. The SHT41 sensor is the fourth generation of I2C temperature and humidity sensor from Sensirion. (They started at the SHT10 and reached the top!). The SHT41 has an excellent ±1.8% typical relative humidity accuracy from 25 to 75% and ±0.2 °C typical accuracy from 0 to 75 °C. Note that the reported temperature may be a few degrees higher than ambient due to self-heating.

The SHT41 Trinkey is perfect for simple projects that want to read the ambient temperature and humidity without any extra wiring, soldering, drivers, or complex software. In fact Adafruit even ship the board pre-programmed with code that will print a unique serial number, the temperature, humidity and touch sensor over a serial/COM port in CSV (comma separated value) format, so you can use it immediately. If you need to measure farther than the computer port, simply use any USB A extension cable.

If you need the 'best' of the SHT4x series, check out the SHT45 Trinkey which has ±1.0% typical relative humidity accuracy from 25 to 75% and ±0.1°C typical accuracy from 0 to 75 °C.

We think it's just an adorable little board, small and durable and inexpensive enough that it could be a first microcontroller board or inspiration for advanced developers to make something simple and fun.

ATSAMD21E18 32-bit Cortex M0+ - 48 MHz 32 bit processor with 256KB Flash and 32 KB RAM
Native USB supported by every OS - can be used in Arduino or CircuitPython as USB serial console, MIDI, Keyboard/Mouse HID, even a little disk drive for storing Python scripts.
Can be used with Arduino IDE or CircuitPython
One RGB NeoPixel LED
One Capacitive Touchpad
SHT41 Temperature + Humidity sensor with thermal-isolation cutout
Reset switch for starting your project code over or entering bootloader mode
Slim and cute, keychain-friendly!

Technical Details

SHT41 Specifications & Features

Relative humidity accuracy: up to ±1.8 %RH
Temperature accuracy: up to ±0.2 °C
Breakout supply voltage: 3.3 to 5V
Average bare sensor current: 0.4 µA (at meas. rate 1 Hz)
Idle bare sensor current: 80 nA
I2C fast mode plus, CRC checksum
Operating range: 0…100 %RH, -40…125 °C
Fully functional in condensing environment
Variable power heater
NIST traceability for sensor
JEDEC JESD47 qualification for sensor
Mature technology from global market leader Sensirion
I2C address 0x44

Product Dimensions: 31.8mm x 11.8mm x 4.5mm / 1.3" x 0.5" x 0.2"

Product Weight: 1.6g / 0.1oz

Product Comments

Start the conversation

Exact shipping can be calculated on the view cart page (no login required).

Products that weigh more than 0.5 KG may cost more than what's shown (for example, test equipment, machines, >500mL liquids, etc).

We deliver Australia-wide with these options (depends on the final destination - you can get a quote on the view cart page):

$3+ for Stamped Mail (typically 10+ business days, not tracked, only available on selected small items)
$7+ for Standard Post (typically 6+ business days, tracked)
$11+ for Express Post (typically 2+ business days, tracked)
Pickup - Free! Only available to customers who live in the Newcastle region (must order online and only pickup after we email to notify you the order is ready). Orders placed after 2PM may not be ready until the following business day.

Non-metro addresses in WA, NT, SA & TAS can take 2+ days in addition to the above information.

Some batteries (such as LiPo) can't be shipped by Air. During checkout, Express Post and International Methods will not be an option if you have that type of battery in your shopping cart.

International Orders - the following rates are for New Zealand and will vary for other countries:

$12+ for Pack and Track (3+ days, tracked)
$16+ for Express International (2-5 days, tracked)

If you order lots of gear, the postage amount will increase based on the weight of your order.

Our physical address (here's a PDF which includes other key business details):

Unit 18, 132 Garden Grove Parade
Adamstown
NSW, 2289
Australia

Take a look at our customer service page if you have other questions such as "do we do purchase orders" (yes!) or "are prices GST inclusive" (yes they are!). We're here to help - get in touch with us to talk shop.

Have a product question? We're here to help!