One Key Functional Keyboard
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Description/Concept
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This is my concept of a 1 key keyboard, that actually turned out like more of a macro pad. My idea was to make it small, but have it hold every component. The price of the concept currently looks like it might be under $10 (if you have some components like wires, a 3D printer, 3D printer filament, etc).

My part ideas are listed below.
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Changing letters/numbers/keys
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- Option 1: Use a microphone with voice recognition ($5 to $10) 

- Option 2: Maybe host a page for changing keys (with username/password ($0) [using server or replit.com])
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Microcontroller
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- Use a Raspberry Pi Pico ($4 [supports MicroPython and C])

- Use an Arduino Uno ($10 - $20 [only supports C])

- Use an ESP8266 for making wifi connection for site (compatible with key switch, $0.83 on AliExpress)
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Case
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- 3D printed case ($0, Can make more if broken, worse quality)

- Machine-cut metal case ($?, Strong, reduces modularity [and overdoing it a little])
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Cheapest option:
x1 Zealios V2 (worth $1, costs $10 per 10 switches)
x1 Keycap (Approximately $0.30, or if 3D printed, $0)
x1 ESP8266 ($0.83 on AliExpress)
x1 Site (varies, can be setup as web server)
x1 3D printed case (already have materials, $0)

Price:
$2.13 (if you need all parts, it will cost more)

If built, STL/OBJ files will be hosted on the Onekey site.
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