Stahl Storage Device


4 in stock

SKU: LD-STAHL Categories: , ,


The Stahl USB dongle provides long-term storage for about 2000 characters of text. Simply plug the device into your computer and open any serial communications program that supports VT100 emulation (PuTTY, Tera Term, Minicom, screen, etc.) in order to access the built-in text editor.

Also see Blaustahl. Stahl is more compact but has less memory and a less powerful MCU.


  • USB-CDC interface requires no additional drivers on most OSes
  • Built-in text editor
  • ATmega32U2 8-bit MCU (32KB flash, 1024B SRAM)
  • 2KB Ferroelectric RAM
    • Lifespan: 95 years @ +55C, over 200 years @ +35C
    • Endurance: 10^12 read/write cycles @ +85C
  • White LED
  • Includes 3D-printed PLA case (color/appearance may differ from photo)
  • Board dimensions: 24mm x 16mm

Use Cases

  • Password storage
  • Cryptocurrency private key storage
  • Note/list storage
  • Geocaching
  • Time capsules

Usage (Linux)

$ screen /dev/ttyACM0

Editor Commands

CTRL-G   Help
CTRL-L   Refresh screen
CTRL-W   Toggle write mode


  • Schematics, firmware and 3D-printable case are available on GitHub