mirror of
https://github.com/qmk/qmk_firmware.git
synced 2024-12-15 14:13:27 +00:00
2f92880578
Co-authored-by: David <dvdkhlng@posteo.de>
83 lines
3.7 KiB
Markdown
83 lines
3.7 KiB
Markdown
# DQz11N1G
|
|
|
|
![DQz11N1G](https://u.cubeupload.com/ddklg/OPBN5q.jpg)
|
|
|
|
Using QMK with one of the ortholinear contoured keyboards manufactured by [PCD
|
|
Maltron Ltd](https://www.maltron.com) by modding it with a DIY replacement
|
|
controller.
|
|
|
|
This work here in no way officially associated with PCD Maltron Ltd and comes
|
|
with ABSOLUTELY NO WARRANTY, to the extent permitted by applicable law.
|
|
Modifying your Maltron keyboard as described below will certainly void your
|
|
warranty and may e.g. cause damage to your keyboard. Proceed at your own risk!
|
|
|
|
* maintainer: [David Kuehling](https://github.com/dvdkhlng/qmk_firmware_dqz11n1g)
|
|
* Hardware Supported: Maltron DQz11N1G with a replacement controller board
|
|
assembled as described below. The work here is based on a German version
|
|
of the keyboard: DQz11N1G-DE. I assume, but don't know for sure, that
|
|
minor or no changes at all are required to make this work on different
|
|
language versions of the keyboard.
|
|
* Hardware Availability:
|
|
* [PCD Maltron Ltd](https://www.maltron.com), for the original keyboard
|
|
* 1x [Arduino Pro Micro](https://www.sparkfun.com/products/12640)
|
|
* 3x shift register [SN74HC165](https://www.ti.com/product/SN74HC165)
|
|
* 3x ceramic blocking capacitors (100 nF) one for each shift register
|
|
* 1x DIL connector 2 rows a 17 pins.
|
|
* 19x pull-down resistors (10k Ohm),
|
|
* 4 LED current limiting resistors (not sure about the correct resistance,
|
|
using 470 Ohm here)
|
|
|
|
Make example for this keyboard (after setting up your build environment):
|
|
|
|
make handwired/dqz11n1g:default
|
|
|
|
## In Detail
|
|
|
|
[PCD Maltron Ltd](https://www.maltron.com) manufactures ergonomic keyboards
|
|
that appear to be hand-wired internally. For the Maltron DQz11N1G-DE
|
|
keyboard that I happen to own, the keyboard matrix is wired to a 34-pin DIL
|
|
connector. This makes it rather easy to replace the proprietary
|
|
controller-board with a self-made board based on the QMK firmware.
|
|
|
|
I don't really like the default layout of my Maltron DQz11N1G-DE keyboard,
|
|
and modding it to work with QMK allows me to adapt it to my needs. It
|
|
especially allows for the two space keys to assume different roles, thereby
|
|
creating an additional easily reachable thumb-key.
|
|
|
|
### Internal Details of Keyboard Matrix and DIL Connector
|
|
|
|
![DQz11N1G-DE keyboard matrix](https://u.cubeupload.com/ddklg/OJFue6.jpg)
|
|
|
|
![DQz11N1G-DE keyboard matrix connector](https://u.cubeupload.com/ddklg/fjFXeL.png)
|
|
|
|
### Replacement Keyboard Controller Board
|
|
|
|
Due to supply chain problems, I decided to base this on an
|
|
Arduino-compatible [Pro Micro](https://www.sparkfun.com/products/12640)
|
|
board which is still easy to source.
|
|
|
|
Unfortunately pin-count of the DQz11N1G-DE's keyboard matrix is way beyond
|
|
the Pro Micro's available I/O pin count. I'm using three 8-bit
|
|
shift-registers ([SN74HC165](https://www.ti.com/product/SN74HC165) ) to
|
|
connect the 19 columns of the keyboard matrix for readout. Due to diode
|
|
direction in DQz11N1G-DE we also need 19 pull-down resistors one for each of
|
|
the utilized shift-register inputs.
|
|
|
|
This is a design sketch of the replacement board this is based on. Note how
|
|
we need a custom matrix.c source file to deal with the shift register based
|
|
keyboard readout.
|
|
|
|
![Sketch of Keyboard Controller Board](https://u.cubeupload.com/ddklg/GBZgSf.png)
|
|
|
|
This is how the assembled controller board looks like, on the right side you
|
|
see the original PIC-based controller the keyboard ships with.
|
|
|
|
![The assembled controller next to the original controller the keyboard ships with](https://u.cubeupload.com/ddklg/KLYF2V.jpg)
|
|
|
|
Inside of the keyboard after installing the new controller board:
|
|
|
|
![Installed controller](https://u.cubeupload.com/ddklg/Br0aiF.jpg)
|
|
|
|
(Not visible in the photo: I drilled hole into the keyboard above the USB
|
|
connector for a reset switch to simplify flashing controller firmware)
|