qmk-firmware/keyboards/handwired/daskeyboard/daskeyboard4

daskeyboard4

Reverse engineered PCB definition of daskeyboard 4 (Professional)

• Keyboard Maintainer: Commander1024
• Hardware Supported: The PCB, rotary encoder, LEDs
• Hardware Availability: https://www.daskeyboard.com/de/daskeyboard-4-professional/
• Microcontroller used: https://stm32-base.org/boards/STM32F401CEU6-WeAct-Black-Pill-V3.0.html

I used a WeAct Black Pill V3.0 featuring the STM32F401CEU6 processor to replace the keyboard's destroyed controller. This keyboard definition can also be easily adopted to use any other microcontroller compatible with QMK and with sufficient I/O ports.

The layout definition in info.json contains the magic. The rows and columns appear in the pin definition in the order they appear on the 26 pads, where the original ribbon cable was connected. Note: Pad 25 is not connected.

It should work for ANSI as well as ISO variants, although I only tested the latter.

Rotary encoder and LEDs are handwired.

Media key mapping

KC_RGUI (right super key) is used to switch or toggle (double tap) to media layer.
The rotary encoder is used for volume control.

Make example for this keyboard (after setting up your build environment):

make handwired/daskeyboard/daskeyboard4:default

Flashing example for this keyboard:

make handwired/daskeyboard/daskeyboard4:default:flash

See the build environment setup and the make instructions for more information. Brand new to QMK? Start with our Complete Newbs Guide.

Bootloader

Enter the bootloader in 3 ways:

• Bootmagic reset: Hold down the key at (5,16) in the matrix (usually the top left key or Escape) and plug in the keyboard
• Physical reset button: Briefly press the button on the back of the PCB - some may have pads you must short instead
• Keycode in layout: Press the key mapped to QK_BOOT if it is available

PCB-Pinout

PCB-pin	properties	STM32F411
1	column, diode, 4 switches	C14
2	row, no diode, 13 switches	A13
3	row, no diode, 15 switches	A14
4	column, diode, 3 switches	C15
5	column, diode, 8 switches	A0
6	row, no diode, 14 switches	A1
7	column, diode, 7 switches	A2
8	row, no diode, 13 switches	A3
9	column, diode, 7 switches	A4
10	column, diode, 7 switches	A5
11	column, diode, 8 switches	A6
12	column, diode, 8 switches	A7
13	column, diode, 7 switches	B0
14	column, diode, 7 switches	B1
15	column, diode, 7 switches	B10
16	column, diode, 7 switches	B9
17	row, no diode, 12 switches	B8
18	column, diode, 2 switches	B7
19	column, diode, 2 switches	B6
20	column, diode, 6 switches	B5
21	column, diode, 6 switches	B4
22	row, no diode, 12 switches	B3
23	row, no diode, 10 switches	A15
24	row, no diode, 15 switches	B15
25	N/C
26	column, diode, 7 switches	A8