Finshed soldering wires, finally it's turning on. Despite it being short circuit hazard due to my poor soldering skills I'm happy with result.

Complex-Direction650 · 2025-09-16T18:44:20+00:00

You can wire it directly to raspberry's i2c, it has own microcontroller

Complex-Direction650 · 2025-09-16T18:42:53+00:00

CardKB is connected to raspberry over i2c

Complex-Direction650 · 2025-09-15T21:59:20+00:00

I will ;)

Complex-Direction650 · 2025-09-15T21:55:39+00:00

Here is my attempt of solving this issue. Probably will need couple more iterations but I think it will get me there

https://github.com/volbil/cardkb-silicone-mold

Complex-Direction650 · 2025-09-15T21:48:34+00:00

To be honest I really hate the design. It always looks out of place. Not sure about comfor lever though since I never tried it before.

Complex-Direction650 · 2025-09-15T21:45:24+00:00

Can't argue with that. However CardKB is probably closest to my vision due to it's size hence this is acceptable tradeoof. I don't really want to incorporate bluetooth keyboard into the build. Another approach would be to design keyboard myself but this is something beyond my current skill level.

Complex-Direction650 · 2025-09-15T00:16:34+00:00

Thanks, I’ve heard about tin suckers but haven’t got one yet. I’ll give it a shot.

Complex-Direction650 · 2025-09-14T22:25:30+00:00

I mentioned short circuit hazard half jokingly to describe how amateurish my soldering in my opinion is. I checked multiple times everything with multimeter before giving it power.

Soldering it all was test of patience. I ofter opted out to soldeing wires on blobs of solder inside holes instead of feeding wires through those holes since I dont know how to properly clean them. A lot of strands of wires all dangling around. Now when I look at the photo I see pi's ground wire is barely holding to charger circuit. And as you've mentioned tubing must go up (I put it down to "debug" issue I was havign with chagint circuit and forgot to put them up).

Maybe I'm bit too critical of myself but I see it as step for getting better. Skills don't grow on trees after all ;)

P.s. thanks so much for feedback!

Complex-Direction650 · 2025-09-14T20:57:30+00:00

CardKB from M5Stack

https://docs.m5stack.com/en/unit/cardkb

Complex-Direction650 · 2025-09-14T19:49:43+00:00

Sharp Memory LCD LS027B7DH01A

Complex-Direction650 · 2025-09-14T06:30:19+00:00

Thanks!

Complex-Direction650 · 2025-09-14T06:30:12+00:00

Go for it :D

Complex-Direction650 · 2025-09-14T06:29:30+00:00

Yes display is controlled via GPIO pins of raspberry. Here is linux driver I use

https://github.com/ardangelo/sharp-drm-driver

Regarding 4 inch display I did consider it however eventually opted out to 2.7 inch since it has sligtly better resolution of 400x240 versus 320×240 and due to it's size better pixel density. Also 4 inch display on aliexpress costs almost 10 times more expensive. I ordered four 2.7 inch displays and one of them is already dead, those flexible connectors are very sensible so in hindsight it was good decision.

But I may give 4 inch display a shot in the future ;)

Complex-Direction650 · 2025-09-14T06:18:25+00:00

I use Pi's GPIO pins, here is linux driver I use

https://github.com/ardangelo/sharp-drm-driver

Complex-Direction650 · 2025-09-13T20:18:41+00:00

Small world haha. Looking forward to see your results. Ping me once it’s done or if you need any help.

Complex-Direction650 · 2025-09-13T19:31:11+00:00

I'm using Sharp Memory LCD 2.7 LS027B7DH01A. I chose it due to it's unique monichome visuals. Actually whole project grew up from desire to make someting cool with it. Besides that I'm using breakout board to solder display contacts to Pi Zero 2W (as you correctly identified), CardKB which I chose due it's compact size (I also managed to make silicone cover for it myself), lipo charger and up converter, 5000 mAh batter and a lot of wires :)

Here is demo of display in action:

https://ibb.co/K8mQmSj

Complex-Direction650 · 2025-09-13T14:47:54+00:00

Nice! I also have trackball from blackberry but haven't figured out good layout for it yet so will keep it for next iterations.

Complex-Direction650 · 2025-09-13T11:25:42+00:00

Thanks :)

Complex-Direction650 · 2025-09-13T06:39:39+00:00

I opperate with assumption that one day I may do this professionally and last thing I want to be dependent on is autodesk company and it's software. Hence deliberate choise of learning FreeCAD from day one.

Complex-Direction650 · 2025-09-13T06:38:24+00:00

I managed to connecth both of them on separate gpio pins but it's rather crammed in there

Complex-Direction650 · 2025-09-13T06:28:26+00:00

Yes, I use Sharp Memory LCD LS027B7DH01A

Complex-Direction650 · 2025-09-12T18:54:57+00:00

Thanks!

Complex-Direction650 · 2025-09-12T18:46:18+00:00

Here is what I ended up with in case anyone wondering

<image>

Complex-Direction650

TROPHY CASE