Bacas3.0

NOTE: for latest images, scroll down. I think these old images still have some value to this haha

this is a 3x4 macropad, utilising 12 keys wired via matrix wiring with a rotary encoder and an oled display. the main microcontroller is a seeed studio xiao rp2040.

this is the first (well second time including the 1 x 3 example) creating a pcb and it was so fun learning, drawing and arranging the components and it took so long but i feel that its a vital skill that i'll definately need to touch on again

note: native files in cad folder

BOM: 1 Seeed XIAO RP2040 12x 1N4148 Diodes 12x MX-Style switches 1x EC11 Rotary encoders 1x 0.91 inch OLED display 12x white blank DSA keycaps 4x M3x16mm screws 4x M3x5mx4mm heatset inserts

Full mockup: this is a full mockup of the entire design, including switches, the rotary encoder, the microcontroller, and the oled display

Schematic:

i ONLY found out there was a much neater way for my pcb schematic AFTER i finished it so apologies for the mess, but it was a new experience learning matrix wiring for efficient pin usage

PCB: i tried to make the pcb as nice as possible, but this took so long haha here it is in 3D:

final (apparently not) update, heres an image of the assembly with a translucent top plate:

andd heres the back without the cover:

UPDATE: added mounting holes to PCB and Caseee:

PCB with mouthing holes:

In 3D:

The back of the PCB in 3D:

Updated the case with holes to mount the PCB on:

Clearer view of said holes because image isnt that clear on showing it: