Add Azoteq TPS65 trackpad and NIZ socket

[Olson3R]

Adding part for Azoteq TPS65 trackpad and NIZ (rubber dome/topre).

• For the NIZ switch, I'm trying out AH3572 HE switches. I'm not sure if they can be wired into a matrix... Possibly have to be direct pins.

Purchased mine from:
https://www.mouser.com/ProductDetail/Azoteq/TPS65-201A-S?qs=pfd5qewlna5Lh8O0E8DcUQ%3D%3D
https://shop.beekeeb.com/product/niz-ec-switch/
https://www.digikey.com/en/products/detail/diodes-incorporated/AH3572-P-B/9649753

Example:

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Updated (UTC)
cosmos-keyboards	✅ Ready (Inspect)	Visit Preview	Jan 20, 2025 3:28pm

[rianadon]

Loving the models! A few comments:

1. I noticed the socket for the NIZ switch is quite wide. Is it possible to reduce the border around the part to reduce its size? Because Cosmos adds webbing and walls all around the switch you barely need any border around the holes for strength. Thickness of 0.1mm on the outer walls is ok. Just don't make the socket smaller than 18x18–that's the limit at which things will start intersecting the MX keycaps.

2. Similarly, you could could reduce the border thickness on the trackpad socket. Or, you could simply delete the entire 4mm tall border so that only the 2.5mm tall part is left. Keeping socketSize at 4mm will ensure that Cosmos adds its own 4mm tall border around the socket. This is how the display models work. And don't worry about the rounded corners because the trackpad will be held in by the 4 sides.

   Personally I think the model looks better with that padding, but it's ultimately better the model is as small as we can get it. Configurable padding around keys is something I can add to the generator.

3. If you have the STEP for the trackpad model, I'd appreciate if you could bundle that step file for the socket, and name each according to the documentation. It's easier for me and others to edit the model later on if it's a STEP.

4. If you don't mind adding a little more detail to the niz switch model, that would help a ton. If you can get the silhouette correct, I have a pipeline (renderSwitch.ts + tracing in inkscape) to produce the switch icons in the dropdown menu.

5. Docs for assembling the niz switches / hardware can go in another PR.

[rianadon]

One more thing: you should check what the distance from keycap bottom -> keyboard top is when the switch is both pressed and not pressed. That information goes into src/lib/geometry/switches.ts, and the lack of configuration here might be what's causing the intersection errors.

[Olson3R]

Adding the switch heights did the trick!
Anything else you want for this?

[rianadon]

I assume this is because the Niz switch is press-fitted into the socket? It'd be great if we had a solution that doesn't require press-fitting, but I see little helpful to create a latching mechanism in the Niz switch housing.

P.S. The PR looks A-OK to me!

[Olson3R]

Correct, they are press fit.
They do have slots for tabs, but IMO, it would be tough to 3d print something with FFM. Less sure about resin.

I may eventually look for a different HE sensor again. Getting it into a matrix setup would definitely be ideal.

[rianadon]

Ah, I see. Tabs are pretty tough to print consistently across FDM printers.

Thanks again for the PR! It would be cool to see this working with a matrix, but I'm out of ideas on how to make it work.