'Operating system' for Arduino and 16x2 LCD.
File structure: single 1500-liner.
Functions: setup()
, loop()
.
Coding conventions: none.
Global variables: everywhere.
Comments: everywhere.
Versioning system: see filename.
This is the result of writing C++ with a beginner's knowledge and endless time.
Not recommended for any purpose, but it was fun to write back in 2019.