9dcd03b6ca
* Set bootloader to stm32-dfu for STM32F303 * Set bootloader to stm32-dfu for STM32F0x2 * Set bootloader to stm32-dfu for STM32F4x1 * Set bootloader to stm32duino for sowbug * Delete redundant bootloader_defs headers * Add some missing MCU name comments * Move APM32 dfu-suffix overrides underneath bootloader * Remove redundant STM32_BOOTLOADER_ADDRESS defines/rules |
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| .. | ||
| keymaps | ||
| config.h | ||
| d48.c | ||
| d48.h | ||
| ds1307.c | ||
| ds1307.h | ||
| glcdfont_d48.c | ||
| info.json | ||
| readme.md | ||
| rules.mk | ||
| taphold.c | ||
| taphold.h | ||
D48
A Proton C based handwired 48 key keyboard with 2 rotary encoders, I2C OLED, WS2812 strip, buzzer & clock!
- Keyboard Maintainer: Andrew Dunai
- Hardware Supported: Proton C handwired
Make example for this keyboard (after setting up your build environment):
make handwired/d48:default
Details
- Proton C based handwired keyboard
- 2x custom 1.25mm stainless steel plates
- Kailh Choc White (clicky)
- 2x rotary encoders
- 0.91" 128x32 I2C OLED
- Small buzzer mounted inside (still waiting for the AST1109MLTRQ boys)
- WS2812 strip (14 LEDs)
- DS1307 I2C module real-time clock
Build process: album
Pinout
Challenges
I'm very happy with the result, but at some point Proton C was driving me nuts.
I did a lot of trial and error during assembly & programming. There were a lot of yet undocumented caveats, so I'll outline them here so that you guys can avoid the same issues I had.
Matrix & encoders
Although this is a 48-key board with a 12-col & 4-row matrix, I've decided to add an extra row above the first one to make my matrix 12x5 and wire encoders' push buttons as 2 extra keys, thus making it a total of 50 (12x4 + 2 encoders). I used 2 columns (9 & 12) for those buttons.
So, a first row actually has 2 buttons on columns 9 & 12 (because encoders are located near those columns). Encoders' push buttons are also configured via QMK's keymap.
Check out the d48.h & config.h for pins used & keymap macro definition.
I2C/OLED
Most of the stuff worked out of the box, except me choosing the right pins for my OLED.
On the Proton C pinout, there are 3 labels for I2C and for some reason
there are 2 pairs of SDA/SCL for I2C1 channel: B8/B9 (rear left side) and B6/B7 (rear right side).
I'm not sure if this is a mistake or if I was doing something wrong. So initially I picked B8/B9
which were not working. When I switched to B6/B7, things worked like a charm.
Later I used B9 for matrix row. No issues so far.
Oh, and by the way, while using B8/B9, keyboard was sometimes swallowing quick keypresses.
I believe this was due to I(2)C timeouts (because incorrect pins were used for OLED).
Buzzer
It turns out once you switch on AUDIO_ENABLE, you cannot use A4 & A5 because they interfere with the buzzer.
My guess is that buzzer uses DAC channels (not sure why both).
I couldn't find this in documentation. Honestly, Proton C has almost zero documentation and this was the biggest challenge. Anyway, apart from almost going crazy from those challenges, I really liked it!
RGB
I used pin A15 for my WS28128 RGB strip.
D1307 real-time clock
Connecting DS1307 RTC was a piece of cake: same I2 pins as OLED (SDA/SCL), GND to GND and power to Proton C VUSB pin (5v).
Other issues
B5could not be used for matrix.TAP_CODE_DELAYhad to be increased to 10 to fixtap_code(KC_VOLU/KC_VOLD)calls being swallowed in encoder callback.- Be extremely attentive about the pinout: keep in mind that the official Proton C pinout displays the rear of the board, not the front. Being used to front pinouts, I ended up soldering entire matrix to the wrong side, so I had to desolder every wire and connect it to the opposite side.
Conclusion
I had a lot of fun. The layout was inspired by the Planck THK. Feel free to ask any questions!