MediaHackpad

Media Macropad

This is my submission for Hackpad! Has the following very cool features

• 2 Neopixels
• A 128x32 OLED screen
• 9 keys in a 3x3 orientation
• KMK firmware

Schematic

Here's a picture of the schematic

PCB

I had to rework the PCB traces a few times to make space for mounting holes, but it worked out in the end. The dimensions of the PCB are 99x95 (WxH)

CAD

Was relatively painless to make the case once I finalised my PCB design, the only issue was I went back and forth a few times.

Here's the base and the shell of the case as individual parts.

Firmware

The firmware was build with KMK and Python. The screen is unimplemented as of now, but will be Soon™. There is now a better, alternative firmware created with QMK which also supports KIN to send information to the keyboard (Use the non-via one)

Bill of Materials

Parts:

• 9x Cherry MX Switches
• 2x SK6812 MINI Leds
• 1x XIAO RP2040
• 9x Blank DSA Keycaps
• 4x M3x16 screws
• 4x M3x8 screws
• 8x M3 Heatset
• 9x Through-hole 1N4148 Diodes
• 1x EC11 Rotary encoder
• 1x 128x32 0.91 inch OLED display

Other Stuff:

• The PCB
• The Case, comprised of two 3D printed parts

Credits

Here's a list of libraries and resources I used to create my hackpad

Kicad Libraries

• XIAO footprints/schematics - https://github.com/Seeed-Studio/OPL_Kicad_Library
• 0.91 OLED Display footprints - https://github.com/gorbachev/KiCad-SSD1306-0.91-OLED-4pin-128x32.pretty
• Rotary Encoder footprints - https://kicad.github.io/footprints/Rotary_Encoder

3D Models

• SK6812 LED - https://grabcad.com/library/sk6812-mini-sk6814-smd3535-1
• Cherry MX Switches - https://grabcad.com/library/cherry-mx-switches-mx-1
• Rotary Encoder - https://grabcad.com/library/rotary-encoder-17
• OLED Display - https://grabcad.com/library/display-oled128x32-1
• XIAO RP2040 - https://grabcad.com/library/seeed-studio-xiao-rp2040-1

Tutorials/References

• Duccs Fidget Toy - https://github.com/hackclub/hackpad/tree/main/hackpads/Duccs%20Fidget%20Toy
• Cyao's Mega Macropad - https://github.com/hackclub/hackpad/tree/main/hackpads/cyaopad
• Orpheuspad - https://github.com/hackclub/hackpad/blob/main/hackpads/orpheuspad/pcb/.gitignore
• Joe Scotto's PCB Design Video - https://www.youtube.com/watch?v=8WXpGTIbxlQ
• KMK Docs - https://github.com/KMKfw/kmk_firmware/tree/main/docs/en