80--Keyboard

Keyboard

My Keyboard is a standard 80% keyboard with an added Rotary Encoder for volume control.

I made this Keyboard for myself, And to learn. This was my first time using Chip on Board tech, so it was quite a challenge for me, but it helped me learn alot.

Features:

• 80% Keyboard
• 87 Keys
• Rotary Encoder
• Arrow Keys
• F Keys
• Chip On Board

CAD Model:

I designed the Case to fit together with 3 pieces and 8 M2.5 screws. The 3 pieces are the Bottom of the case, The sides of the case (with a cutout for the USB-C) and the Top of the case, which includes the switch plate and the Top Frame. The Bottom and Sides are clearance holes and the screw threads into the top. The screw threads into 1.4mm of the top part and the screws are actually held .5mm higher than the bottom instead of flush.

<img src=assets/cad.png alt="Keyboard" width="500"/>

PCB:

I made my PCB in KiCad. This was my first time using CoB, Chip on Board, where instead of using a microcontroller, The RP2040 chip is directly on the board with all the other necessary components. I ended up reffereing to RP2040 Datasheet alot for this.

Here is the Schematic, I spend alot of time figuring out how to get the whole CoB system working, but I think I did well.

<img src=assets/schematic.png alt="Keyboard" width="500"/>

Here is the PCB, I think I was able to make it pretty Compact with the components, however I am still unsure about the USB-C port.

<img src=assets/pcb.png alt="Keyboard" width="500"/>

Firmware:

I decided on KMK firmware for this keyboard, as it is quite easy to code and implement.

BOM: