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diff --git a/keyboards/handwired/d48/readme.md b/keyboards/handwired/d48/readme.md new file mode 100644 index 0000000000..a20b8a4251 --- /dev/null +++ b/keyboards/handwired/d48/readme.md @@ -0,0 +1,87 @@ +# 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 I<sup>2</sup>C OLED +- Small buzzer mounted inside (still waiting for the AST1109MLTRQ boys) +- WS2812 strip (14 LEDs) +- DS1307 I<sup>2</sup>C module real-time clock + +Build process: [album](https://imgur.com/gallery/zZZGdDw) + +## 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. + +## I<sup>2</sup>C/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 I<sup>2</sup>C and for some reason +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). +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 I<sup>2</sup> pins as OLED (SDA/SCL), GND to GND and power to Proton C VUSB pin (5v). + +## Other issues + +- `B5` could not be used for matrix. +- `TAP_CODE_DELAY` had to be increased to 10 to fix `tap_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! |