So it started with a vortex core. I do not own one, but I really like the case design of the vortex core: minimal, blocky, sharp corners, low profile, not visible from top.
Now I own a let's split with acrylic top and bottom. They are fine, I am loving the ortho life more everyday. Someday the DIYer in my soul strikes me: since you like the vortex core case, why not you make your split a case like that?
So I started designing a case like that.
Soon I realise that the original pcb will not fit in this kind of design,
so,
why not try to design a pcb that fits in the case?
So I started learning KiCad, reading the schematic of the let's split, identifying the pin assignment.
Then again I realize the with a pro micro on board,
it will increase the case thickness or an extra milling will need to be done.
So I have to use SMT component. I studied the schematic of the pro micro, and I took reference from GH60 schematic and other guides.
I ended up with this:
Left and Right (case side):
Left and Right (plate side):
I put the diodes on the plate side because it's a bit difficult to route them when they are at the same side with other components.
By the way the words printed on the PCB is Japanese word '梅Ume 酒Shu', meaning is plum liqueur. Simply because my wife loves it very much
Now the pcb is not reversible like the Let's Split V2, which means the ports connecting two boards are fixed, which is at the inner side of the board, and it only takes cherry/clone as the cherry+alps compatible foot will take up too much space for circuit route tracking.
The connection between 2 PCB will be microusb, because it has by far the smallest footprint in my limited knowledge, I am actually seeking suggestion of a better and smaller connection.
So the final version of the initial design will be something like this:
Case:
The opening at the bottom is prepared for the resest switch, and the 2 openings at the side are for the Micro USB.
Assemble with DSA keycaps:
The switches and the keycaps are not entirely accurate, I just made them for the sake of getting a rough idea how the final product will look like.
Feature:
1) 'Vortex core style' case.
2) It should share the existing let's split V2 firmware.
3) Everything connects via MicroUSB, though I am not sure about the availability of microusb-microusb cable.
4) Case can be used for either left or right since it is almost symmetrical, the plate will be design to tolerate the minor asymmetricity of the case.
5) The plate, not the PCB, is tighten to the case with M2 screws.
6) There are dedicated connection point for WS2812B LED strip aka RGB backlitable (but this required a new case).
Looking for advice:
1) The pcb design. It will be really great if someone experienced can evaluate/check my pcb, I have almost zero experience designing a PCB.
2) Prototyping of case and the PCB. I lived in Singapore, I do not know who to approach for the prototype fabrication, if anyone from here can show me the direction towards fabricating the prototype, or anyone here can quote me for the prototyping, it will be really helpful.
Feeling difficult in:
1) Of course soldering the SMT component, especially the Atmega32. I have no good soldering iron too.
2) Again making the prototype real, not sure who can help me in this. Budget is a concern too.
Planning:
1) To design a semi-sandwich case for RGB underglow. (but this means one more part)
2) To add tilt or tenting to the case.
Please feel free to judge the design, really.
If you are confident enough and want to take the design and make a testing prototype, or even production, please do it, I am totally okay with it, the design might not come true if it's just me alone.
