John,
Ran across this neat little sketch to test encoders. I used a new NANO and used this sketch straight up. All? of my encoders test good. However, I did learn a thing or two. One batch of encoders, the KY-40 version, occasionally puts in a 255 for the value when you are expecting a 0, 1, 2 or 3 for the output. The other batch never did do that.. The one without the board .. However those don't have the switch, so I will order me some from Mouser or Digi and get a replacement...
Still, that doesn't answer my questions about the frequency. think maybe an input on the nano is bad?
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72 and God bless
KD4EPG
