A rugged offline-library handheld: Raspberry Pi 5, a 5″ touch display, a 2S 18650 UPS and a compact keyboard in a printed case. It keeps Wikipedia, maps and the Gutenberg books on the device — no network, no account, no cloud. Charged by solar and/or axial-flux hand crank.
The name
Ktemata (κτήματα) is Greek for “possessions, things owned”. Thucydides opens his History of the Peloponnesian War by calling his work κτῆμα ἐς ἀεί, “a possession for all time”: written down so that what happened stays available to whoever comes later. That is the device’s job. The phrase is engraved on the case.
The build
- Computer
- Raspberry Pi 5
- Display
- Raspberry Pi Touch Display 2, 5″ (143.4 × 91.46 mm)
- Power
- Waveshare UPS HAT (B), 2× 18650 in 2S, 8.4 V DC charge input
- Input
- Rii K06 keyboard with touchpad (2.4 GHz dongle or Bluetooth)
- Case
- 172 × 237 × 53 mm, parametric OpenSCAD prints
- Charge
- Solar or axial-flux hand crank generator
Everything for the device build — geometry, drawings, STLs, renders and notes — lives in the repository: github.com/jsoeterbroek/ktemata.
Everything for the compatible axial-flux hand crank generator build — geometry, drawings, STLs, renders and notes — lives in the repository: github.com/jsoeterbroek/handcrank.
Use at your own risk
This is a hobby project, published as-is, with no warranty of any kind. The case and the wiring information are design proposals, not certified hardware. You are responsible for your own build: check the fit of your parts, verify polarity and fusing before connecting lithium cells, and never leave a charging pack unattended. Anything you print, assemble or power up is at your own risk; the author accepts no liability for damage, injury, data loss or fire.