Penkesu Computer - A Homebrew Retro-style Handheld PC
Penkēsu (Japanese: ペンケース
) is a retro-style handheld device powered by a Raspberry Pi Zero 2 W, a 7.9 inch widescreen display (1280 x 400 resolution), and a 48-key ortholinear mechanical keyboard.
The enclosure of Penkesu Computer is designed around the display and keyboard to achieve a (relatively) compact physical dimensions.
Repurposed Gameboy Advance SP hinges and ribbon cable for HDMI are used to keep the hinge design thin, yet they hold the weight of the display so it won’t tip over.
Electronics are kept to be minimal (3 internal components) and most of the parts are either 3D printable or off-the-shelf product.
See also: the keyboard sound test video.
Ever since the CutiePi tablet has been successfully funded and started shipping, I feel the need to work on a new project, something I don’t need to worry too much about commercial viability, and to remind myself why I started tinkering. A “rebound” project, so to speak.
And since there are no immediate plans on selling kits or making Penkesu Computer mass producible, I’d like to publish all the designs and plans so there’s enough information for anyone interested in making one.
Links are not affiliate links, and only provided as references.
About the keyboard:
Koda
, which us originally designed by larrbo and released under Creative Commons BY-NC-SA 4.0 License. I’ve tweaked the layouts so it fits my need and looks closer to the Planck
For the keycaps:
Add heat-set threaded inserts (M2x6) to the 4 corners of screen bezel, and 2 to the hinge cover
Wrap the ribbon cable twice and pull it out through the hinge cover
Wiring:
Component | Pin |
---|---|
battery positive | PowerBoost Bat pin |
battery negative | PowerBoost GND pin |
switch 1 pin | PowerBoost GND pin |
switch 2 pin | PowerBoost EN pin |
PowerBoost 5V OUT |
display and Pi Zero’s VCC |
PowerBoost GND |
display and Pi Zero’s GND |
If you made it this far, welcome to check out my other project, the CutiePi tablet, which is also a 100% open source hardware! :-)
Copyright (c) 2022 Penk Chen. All rights reserved.
All files are licensed under MIT license, see the LICENSE for more information.