If truth be told, HIGH and LOW are very prosaic names. If they weren't already all over the Arduino planet, I'd be quite happy using 0 and 1 for I/O states.
No - discriminatory towards the 3.3V variants
Just being pedantic...
It would be nice to flip your initial schematics horizontally to depict signal flow from left to right... Just a thought to introduce the learners to logical schematic layout.
You did well with positive higher, and negative lower.
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