Cantaloupe

~60% QMK-compatible split ergonomic keyboard.

Disclaimer

This keyboard is licensed under CERN-OHL-S-2.0. The layout is based on the Ergodash layout with the inner-most keys removed and an improved thumb cluster. The layout was only used as a reference, nothing was copied and the board is a completely new design. In addition, design cues from the YAEMK were used in this design.

Key Features

• Ergonomic 30-key layout including pinky stagger and arrow keys.
• MX switches with kailh hot-swap sockets.
• 100% reversible design which means only a single board is needed for both sides.
• 0.96" 128x64 SSD1306 OLED support.
• Two rotary encoders supported above the thumb cluster, one on each side.
• Support for the Pimoroni trackball module is also available, replacing one rotary encoder slot.
• On-board ARM STM32F401CCU6 processor.
• USB-C input and split connect ports with full ESD protection.
• SWD breakout header for an alternate means of programming the board.

Changelog

• 22/10/2024: License updated to CERN-OHL-S-2.0.
• 14/5/2022: Added silkscreen jumper guides. Connected indicator LED to spare GPIO. Updated images.
• 13/5/2022: Finalized firmware. Added custom graphic to OLED display. Updated 3DP case and BOM. Removed CNC case. Fixed error with silkscreen. Added silkscreen jumper guides.
• 15/2/2022: Revised 3DP and CNC case designs.
• 13/2/2022: Added tentative designs for CNC and 3D printed cases.
• 11/2/2022: Clean up of design. New images. Added gerbers and files for FR4 plates.
• 9/2/2022: Changed pin assignments so B2 isn't used. Added pull-up for RX pin and pull-down for B2 pin so the keyboard can properly load into the bootloader. Changed reset circuit so it actually works. Removed USB series resistors. Removed non-functional JTAG pins. Changed SRV05-04 to SRV0504. Thanks to sigprof and MasterSpoon from the QMK discord server for the help!
• 8/2/2022: Removed holes in middle of PCB. Added top and bottom plate DXF files, as well as a tentative STEP file for a CNC case.
• 25/1/2022: Did some rerouting, increased clearances and via size.
• 21/1/2022: Changed CPU to STM32F4x1CxUx (lets me steal them from Black Pill boards). Added plate and base gerber files. Changed BOM to reflect changes.
• 20/1/2022: Cleaned up read-me. Rearranged location of mounting holes and changed size of holes. Rerouted some traces. Cleaned up silkscreen. Added DXF files for plate and base. Changed images. Added BOM.
• 19/1/2022: New V2.0 version. On-board ARM STM32F303 processor, kailh hot-swap, ESD protection, 0.96" OLED, trackball and rotary encoder. 100% reversible design which means only a single board is needed for both sides. Plenty of design cues taken from the YAEMK. Pinky stagger added.