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CodeMate - My Dev Macropad

hiii! this is my hackpad submission. built a 3x3 macropad to speed up my coding workflow

CodeMate Overall

what it does

  • 9 mechanical switches in a 3x3 grid for shortcuts and macros
  • rotary encoder for volume control
  • 0.91" OLED that shows which key i just pressed (flashes for 1.5sec then shows "ready")
  • 6 RGB LEDs that breathe in warm amber and pulse when i hit keys
  • runs on Arduino (not KMK anymore) so i can use TinyUSB

PCB

heres what the electronics look like:

Schematic PCB
Schematic PCB

took me a few tries to get the routing right but it works now

[x] I ran DRC and there are 0 errors but few silkscreen warnings

Case

made in fusion360. fits everything together with M3 screws and heatset inserts

CAD Model

along with the top:

CAD-Top

the switches poke through the top plate and the oled sits in a cutout. pretty clean imo

Firmware

rewrote it in Arduino because i wanted better HID support. NO LAYERS anymore, just 9 coding shortcuts that i actually use:

The Layout:

Comment      | Format Code    | Duplicate Line
Run (F5)     | Terminal       | Close Tab
git status   | git commit     | git push

Encoder: Volume up/down (stays the same always)

what each key does

  • Key 0: Toggle comment (Ctrl+/)
  • Key 1: Format code (Shift+Alt+F)
  • Key 2: Duplicate line (Shift+Alt+Down)
  • Key 3: Run code (F5)
  • Key 4: Toggle terminal (Ctrl+`)
  • Key 5: Close tab (Ctrl+W)
  • Key 6: Opens terminal + runs git status
  • Key 7: Opens terminal + types git commit -m "" with cursor inside quotes
  • Key 8: Opens terminal + runs git push

git commands automatically open the VS Code terminal first (Ctrl+Shift+`) then type the command. super handy

LED behavior

  • Normal: slow breathing effect (10% to 40% brightness) in warm amber
  • When you press a key: the LED near that key flashes bright then fades back to breathing
  • Color: warm amber (255, 140, 0) because one of my LEDs has a dead blue channel lol

the oled shows which key i pressed for 1.5 seconds then goes back to showing "ready"

[x] no api keys or passwords in the code

BOM

what you need to build this:

  • 1x XIAO RP2040
  • 9x Cherry MX switches
  • 9x 1N4148 diodes
  • 6x SK6812 MINI-E LEDs (NOT WS2812B, different color order)
  • 1x 0.91" SSD1306 OLED (128x32, I2C)
  • 1x EC11 rotary encoder
  • 1x 330Ω resistor (for LED data line - optional but recommended)
  • 1x 1000µF capacitor (bulk cap for LEDs - optional but recommended)
  • 4x M3x16mm screws
  • 4x M3x5mmx4mm heatset inserts

notes

this was fun to make! spent way too much time tweaking the firmware but learned a lot about Arduino HID and how SK6812 LEDs work differently from WS2812B.

switched from KMK to Arduino because i wanted proper keyboard+consumer HID support and the encoder was being weird in KMK. plus now i can do the breathing LED effect which looks way cooler than static colors

GG

this is the prototype:

image

and when buttons are pressed it looks like:

image image