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

• 9 mechanical switches in a 3x3 grid for shortcuts and macros
• rotary encoder for volume/zoom/scrolling depending on layer
• 0.91" OLED that shows which layer im on and some cool things which i havent decided yete
• 6 RGB LEDs that change color based on mode (blue/green/purple)
• runs KMK firmware so i can customize everything

heres what the electronics look like:

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

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

along with the top:

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

using kmk for this! wrote custom macros for git commands, has 3 layers:

Layer 0 (Blue) - Default:

Copy    | Paste   | Undo
Cut     | Save    | Redo
Layer 1 | Layer 2 | Screenshot
t

Encoder: Volume up/down

Layer 1 (Green) - Code Mode:

Git Status | Terminal | F5 Debug
Git Commit | Comment  | TODO
(hold)     | Run Py   | Git Push
h

Encoder: Zoom in/out

Layer 2 (Purple) - Media:

Play/Pause | Next  | Prev
Mute       | Vol+  | Vol-
Back       | (hold)| Emoji
i

Encoder: Next/prev track

• Hold bottom-left key = Layer 1 (code mode, green)
• Hold bottom-middle key = Layer 2 (media mode, purple)
• Release = back to Layer 0 (default, blue)

the rgb leds change color so you always know which layer youre on

[x] no api keys or passwords in the code

what you need to build this:

• 1x XIAO RP2040
• 9x Cherry MX switches
• 9x 1N4148 diodes
• 6x SK6812 MINI-E LEDs
• 1x 0.91" SSD1306 OLED (128x32, I2C)
• 1x EC11 rotary encoder
• 1x 330Ω resistor (for LED data line)
• 1x 1000µF capacitor (bulk cap for LEDs)
• 4x M3x16mm screws
• 4x M3x5mmx4mm heatset inserts

this was fun to make! spent way too much time tweaking the firmware but learned a lot about kmk in the process.

##TODO: add resource download hyperlink beneath images