bbenchoff.github.io



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Résumé (PDF)


Weird Stuff

Citicar Restoration
My Instagram clone for vintage digital cameras.


Software Development

Instagram Clone (Python, Django)
IS31FL3741 LED driver library (C)
NT35510 TFT driver library (C)
Terminal Parser library (C & C++)


Hardware Development

Nikon lens adapter
The $15 Linux Machine
Portable Dumb Terminal
Mr. Robot Badge
Zip Drive Tower
Full Color Circuit Boards
RGB Gaming Coaster
Serial Fidget Spinner
Baud Box
A Wall of Circuit Boards


CAD Design

Silicone Membrane Keyboard
Injection Molded Palmtop
Retro-inspired industrial design
A Modern BeBox
Hardened clamshell computer
3D Printed Tank Treads
Porygon

Silicone Membrane Keyboard

A side project for the Portable Dumb Terminal, this silicone membrane keyboard is a custom keyboard, much like the buttons in a TV remote control. It was designed in Fusion360 and manufactured for ~$1/piece in quantity 1000.

Silicone Membrane Keyboard

The keyboard presents 69 keys to the user and is interfaced with a custom Eagle library for ‘carbon pill’ buttons. Reading the keyboard is as like any keypad scanning firmware, with the exception that diodes are not used in this implementation – instead, a custom scanning protocol was used to prevent key ghosting.

The keyboards were manufacured with a process that is like – but not identical to – injection molding. Imagine putting a sheet of silicone inside a waffle iron. Legends were then printed onto the keycaps using a pad printing process. Because the legend printing is seperate from the forming of the silicone, many different legend styles can be created without manufacturing a new mold, DVORAK, QWERTZ, and AZERTY, for example.

More information can be found in the Portable Dumb Terminal repository.

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