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88 lines
3.5 KiB
Markdown
88 lines
3.5 KiB
Markdown
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# D48
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A Proton C based handwired 48 key keyboard with 2 rotary encoders, I2C OLED, WS2812 strip, buzzer & clock!
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- Keyboard Maintainer: Andrew Dunai
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- Hardware Supported: Proton C handwired
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Make example for this keyboard (after setting up your build environment):
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make handwired/d48:default
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## Details
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- Proton C based handwired keyboard
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- 2x custom 1.25mm stainless steel plates
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- Kailh Choc White (clicky)
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- 2x rotary encoders
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- 0.91" 128x32 I<sup>2</sup>C OLED
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- Small buzzer mounted inside (still waiting for the AST1109MLTRQ boys)
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- WS2812 strip (14 LEDs)
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- DS1307 I<sup>2</sup>C module real-time clock
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Build process: [album](https://imgur.com/gallery/zZZGdDw)
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## Pinout
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## Challenges
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I'm very happy with the result, but at some point Proton C was driving me nuts.
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I did a lot of trial and error during assembly & programming.
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There were a lot of *yet* undocumented caveats,
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so I'll outline them here so that you guys can avoid the same issues I had.
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## Matrix & encoders
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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
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to make my matrix 12x5 and wire encoders' push buttons as 2 extra keys, thus making it a total of 50 (12x4 + 2 encoders).
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I used 2 columns (9 & 12) for those buttons.
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So, a first row actually has 2 buttons on columns 9 & 12 (because encoders are located near those columns).
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Encoders' push buttons are also configured via QMK's keymap.
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Check out the `d48.h` & `config.h` for pins used & keymap macro definition.
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## I<sup>2</sup>C/OLED
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Most of the stuff worked out of the box, except me choosing the right pins for my OLED.
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On the Proton C pinout, there are 3 labels for I<sup>2</sup>C and for some reason
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there are 2 pairs of SDA/SCL for I<sup>2</sup>C<sup>1</sup> channel: `B8`/`B9` (rear left side) and `B6`/`B7` (rear right side).
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I'm not sure if this is a mistake or if I was doing something wrong. So initially I picked `B8`/`B9`
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which were not working. When I switched to B6/B7, things worked like a charm.
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Later I used B9 for matrix row. No issues so far.
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Oh, and by the way, while using `B8`/`B9`, keyboard was sometimes *swallowing* quick keypresses.
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I believe this was due to I(2)C timeouts (because incorrect pins were used for OLED).
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## Buzzer
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It turns out once you switch on `AUDIO_ENABLE`, you cannot use A4 & A5 because they interfere with the buzzer.
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My guess is that buzzer uses DAC channels (not sure why both).
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I couldn't find this in documentation. Honestly, Proton C has almost zero documentation and this was
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the biggest challenge. Anyway, apart from almost going crazy from those challenges, I really liked it!
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## RGB
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I used pin `A15` for my WS28128 RGB strip.
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## D1307 real-time clock
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Connecting DS1307 RTC was a piece of cake: same I<sup>2</sup> pins as OLED (SDA/SCL), GND to GND and power to Proton C VUSB pin (5v).
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## Other issues
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- `B5` could not be used for matrix.
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- `TAP_CODE_DELAY` had to be increased to 10 to fix `tap_code(KC_VOLU/KC_VOLD)` calls being swallowed in encoder callback.
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- 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.
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## Conclusion
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I had a lot of fun. The layout was inspired by the Planck THK. Feel free to ask any questions!
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