This is a RP2040-based controller which can power any Halcyon keyboard through a wired connection over USB C. Using special connectors, it can simply be clicked on to any Halcyon keyboard; it does not require any tools.

About the Halcyon Series

The Halcyon Series is a series of keyboards that combine what we've learned about split keyboards since 2019 into a unified premium range. That means that you can depend on great quality, complete documentation and shared features such as hot-swappable switches, per-key RGB and RGB underglow, USB C interconnect, and much more.

Unique to the Halcyon Series are its modules, which enable you to add functionality to your keyboard without having to solder. You can choose from a color LCD TFT display, rotary encoder or even a Cirque trackpad! All keyboards in the series use the same standard, so modules can be reused across them, and more modules will be released as we expand the series, which will be backwards compatible.

The controllers used for the Halcyon Series are cold-swappable so they can be reused, replaced or upgraded in the future.

Features

• The RP2040 controller provides plenty of speed for any functionality needed for keyboards and then some, which comes in handy for tinkering and enabling advanced firmware features.
• It can be powered by QMK and Vial firmware.
  • Vial firmware files are provided for Halcyon Series keyboards, and there is comprehensive documentation on how to customise your own QMK firmware, too.
• This controller can be used in wired mode only. Halcyon keyboards all support the  use of USB C cables for this connection.
• it has 128Mbit (16MB) of flash memory, which is enough for both advanced firmware features and even customising a display module with images and animations.
• It provides ESD protection on all inputs and outputs, including the connection to the host device as well as to the other half of the keyboard. This will ensure your keyboard will live a long life.
• The controller has an on-board reset button and a boot button, making it easy to flash new firmware to it.
• There is no power LED, so it'll be stealthy when you want it to be.
• The controller is cold-swappable, making it easy to reuse, replace or upgrade in the future.
• We've ensured A-grade quality control. Each controller is semi-automatically tested and has its own serial number.
  

Bundles

The controller is sold in two different bundles:

• Single controller: A single controller, to serve as a replacement for a defective controller or for use with the upcoming Pro Micro to Halcyon adapter (not yet available).
• Two controllers with Module Connection Kit:
  • Two wired Halcyon controllers.
  • A Halcyon Module Connection Kit which can be used to connect a Halcyon Module to your keyboard. The kit includes:
    • Three flexible flat cables with a length of 50mm, 12 pins, a pitch of 0.5mm and opposite side (B) connectors.
    • Eight M1.6 screws with a length of 3mm.
    • A 1.5mm Allen Key.

Documentation

The Halcyon Series keyboards come with documentation, including:

• An exhaustive build guide helps you with the initial assembly.
• Module-specific guides help you install, replace or remove Halcyon Modules.
• A firmware flashing guide helps you flash the appropriate files to your keyboard so you can put it to work.
• Advanced guides are available to help you set up your own QMK Userspace for deep firmware customisation, use non-Halcyon VIK modules and even design your own Halcyon module.

Read more

You can learn about how the Halcyon Series came to be in the Winter 2024 update over at our blog.

Remarks

• This product is incomplete on its own. Please follow the steps in the Composer to select all the parts needed. Any cases, keycaps, cables and modules shown in the product pictures are not included by default and need to be purchased separately.