state change detection in the 21st century

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.

_5volts _0volts




No - discriminatory towards the 3.3V variants :smiley:

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.

Sorry !

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