Rotary Trinkey - SAMD21

by Adafruit

Image of Board

It’s half USB Key, half Adafruit Trinket, half rotary encoderit’s Rotary Trinkey, the circuit board with a Trinket M0 heart, a NeoPixel glow, and a rotary encoder body. We were inspired by this project from TodBot where a rotary encoder was soldered onto a QT Py. So we thought, hey what if we made something like that that plugs right into your computer’s USB port, with a fully programmable color NeoPixel? And this is what we came up with!

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. Three pins of the microcontroller connects to a rotary encoder with built-in push switch. Another connects to a NeoPixel LED. Finally, one pin can be used as a capacitive touch input. A reset button lets you enter bootloader mode if necessary. That’s it!

Rotary encoders are soooo much fun! Twist em this way, then twist them that way. Unlike potentiometers, they go all the way around, and often have little detents for tactile feedback. But, if you just want to add one to your computer, you know its a real pain. This board is designed to make it very easy.

The SAMD21 can run CircuitPython or Arduino very nicely - with existing Rotary, NeoPixel and our FreeTouch libraries for the capacitive touch input. Over the USB connection you can have serial, MIDI or HID connectivity. The Rotary Trinkey is perfect for simple projects that use a rotating user input and underlit colorful output. Maybe you’ll set it up as a volume knob, scroll wheel, or zoom macro tool - whatever you like!

Please note this board DOES NOT come with a rotary encoder soldered in - we expect folks to pick their favorite rotary encoder and knob! Five solder points and you’re done.

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
  • Single under-lighting RGB NeoPixel LED
  • One Capacitive Touch pad
  • Standard ‘5-pin’ rotary encoder footprint can be used with any “PEC11” or “PEC12” compatible rotary encoder.
  • Cute & keychain-friendly!

Purchase

Contribute

Have some info to add for this board? Edit the source for this page here.

CircuitPython 7.0.0

This is the latest stable release of CircuitPython that will work with the Rotary Trinkey - SAMD21.

Start here if you are new to CircuitPython.

Release Notes for 7.0.0

Built-in modules available: adafruit_pixelbuf, board, digitalio, math, microcontroller, neopixel_write, nvm, os, rainbowio, random, rotaryio, storage, struct, supervisor, time, touchio, usb_cdc, usb_hid, usb_midi

Absolute Newest

Every time we commit new code to CircuitPython we automatically build binaries for each board and language. The binaries are stored on Amazon S3, organized by board, and then by language. Try them if you want the absolute latest and are feeling daring or want to see if a problem has been fixed.

Past Releases

All previous releases are listed on GitHub, with release notes, and are available for download from Amazon S3. They are handy for testing, but otherwise we recommend using the latest stable release. Some older GitHub release pages include the same binaries for downloading. But we have discontinued including binaries as assets on newer release pages because of the large number of files for each release.

BROWSE GITHUB