SR99-Keyboard-PCB

⚠️ Design is done but not tested. Please hold-off on building until the design can be verified and the software is written.

Intent

A 980-layout (99-key) compact near-full size keyboard for QMK feat. per-key RGB and a top-right corner rotary encoder

Progression

• 27 Sep 2024: Beta 1 done
  • WARNING: Not manufactured (yet)
  • WARNING: Not tested (yet)
• See CHANGELOG.md

Rev A

I'm not happy with the optics on this revision. Looks like Via Chicken Pox! Serves me right for self constraining to a 2-layer PCB. I will re-do Rev B in 4-layer, however will proto. mnf. this rev. to test my theories on the:

• SPI Input Shift Registers
• SPI LED Matrix Drivers
• SKYLOONG rotary encoder

This is more about writing the code after all.

Resources

• Schematic PDF here
• EAGLE BRD (PCB) here
• EAGLE SCH (Schematic) here

Beta PCB renders

Top

Bottom (Component side)

Layout ideation renders

Render

Layout

Matrix coordinates (QMK & VIA)

Planned Features

• QMK build, with VIA support
• 1x STM32F411 STM32 CPU (based on Black Pill design)
• 1x M95640-DRE 8K SPI EEPROM Module
• 3x MC74HC589A SPI Input Shift Registers - possibly faster scan rates
• 2x IS31FL3745 SPI LED Matrix Drivers
  • 102x RGB LED's
• 2x SKYLOONG rotary encoder/switch positions (wired for only one in use)
• C3/4 UDB Usb-C

Addons

• DIP Switch daughter board (4-position)
• Case slide switch daughter board (Win/Mac 2-state, + USB+BT+2.4GHz 3-state) (To do)

Wishlist

• Drop in replacement PCB (e.g. compatible standoff positions) for:
  • Brutal v2 1800
  • Monsgeek M2
  • Skyloong GK980 (The GK980 has a 0.5U gap between Esc and F1, making it not the same footprint as the B1k8 and M2.)

Possible BIG issues

• SPI variant for the IS31FL3745B (A is I2C, B is SPI) has no driver in QMK, will need to code one up!!

 
 

Made with ❤️ by Silvino Rodrigues