KeySeeBee is a split ergo keyboard. It is only 2 PCB (so the name) with (almost) only SMD components on it. It's only a keyboard, no LED, no display, nothing more than keys and USB.
The firmware is Keyberon, a pure rust firmware.
- 44 keys, using Cherry MX or Kailh choc switches, only 1U keycaps.
- USB-C connector on the 2 sides.
- TRRS cable for connecting the 2 halves (for power and UART communication between the 2 halves).
- 2 STM32F072 MCU, with hardware USB DFU bootloader and crystal less USB;
- Only onboard SMD component (except for the switches and TRRS connector).
- Plate files (optional).
- Plaid for "show the components"
- GergoPlex for "just a keyboard" and "only a PCB with SMD components"
- Lily58 for the thumb cluster
- Kyria for "don't be affraid of pinky stagger"
Price is for 5 keyboards including shipping.
| Item | Package | Qty | Remarks | Price |
|---|---|---|---|---|
| Left PCB | 1 | Ordered at JLCPCB | ||
| Right PCB | 1 | Ordered at JLCPCB | 33.14€ | |
| USB-C connector | 16 pins | 2 | 1.44€ | |
| 1N4148WS | SOD-323 | 44 | Price is for 1000 | 2.82€ |
| PJ320A TRRS connector | 2 | 1.01€ | ||
| STM32F072CBT6 MCU | LQFP-48 | 2 | STM32F072C8T6 would also work | 9.65€ |
| XC6206P332MR regulator | SOT-23 | 2 | Price is for 50 | 1.93€ |
| SMD switch | 3×6mm | 4 | Price is for 100 | 1.35€ |
| 5.1kΩ resistor | 0805 | 6 | Price is for 100 | |
| 1µF capacitor | 0805 | 4 | Price is for 100 | |
| 100nF capacitor | 0805 | 10 | Price is for 100 | 3.46€ |
| Bumpers | 5×2mm | 10 | Price is for 100 | 1.75€ |
| Cherry MX compatible or Kailh Choc switch | 5 pins (PCB mount) | 44 | ||
| 1U keycap compatible with the chosen switches | 44 | |||
| TRRS cable | Jack 3.5mm | 1 | 4 contacts needed | |
| USB-C cable | 1 | USB-2 is enough |
About 60€ without switches, keycaps and cables for 5 keyboards (12€/keyboard).
Install the complete toolchain and utils:
curl https://sh.rustup.rs -sSf | sh
rustup target add thumbv6m-none-eabi
rustup component add llvm-tools-preview
cargo install cargo-binutils
sudo apt-get install dfu-utilCompile:
cd firmware
cargo objcopy --bin keyseebee --release -- -O binary keyseebee.binTo flash using dfu-util, launch it with:
dfu-util -w -d 0483:df11 -a 0 -s 0x08000000:leave -D keyseebee.binThen, put the board in dfu mode by pressing BOOT, pressing and releasing RESET and releasing BOOT. The upload should began as soon as the computer detect the board in dfu mode.
The first time, if the write fail, your flash might be protected. To unprotect:
dfu-util -d 0483:df11 -a 0 -s 0x08000000:force:unprotect -D keyseebee.binIdeally both sides needs to be flashed, but for changes that only affect the layout it's strictly not needed as the side connected with the USB cable will determine the layout. In fact, you can have different layouts stored on each half, meaning you can switch back and forth between two layouts by moving the USB cable between the two halves.
Here is the empty keyboard-layout-editor describing the layout.
I use the ergol layout, so this is the main layer when I type.
The layer 1 is activated by holding space.
The layer 2 is activated by holding enter.
The layer 3 is activaded by holding space then enter.