Base on that diagnostic and the other test you run I would say definitely the Nano has an analog input issue.
In my test, when you turn the encoder only one way it should always say either incrementing or decrementing but not alternating between the two.
That would explain why your frequency hardly changes when you turn the encoder.
Jim Sheldon (W0EB) had a few defective Nanos, some brand new, and they failed the encoder test of the diagnostic software too.
So it looks like it's (de)soldering time unfortunately.
I had to change my Nano for a different reason and I didn't manage to remove it as cleaning as yesterday's example, but it works.
Regarding SMDs, I until now, always used through hole, but I am sold on SMDs now, thanks to the advice on this forum. I really like the density of the circuits and if you get the few inexpensive tools to handle them it is not difficult. I bought one of these 1206 size component sample books from eBay (or elsewhere) which contains all valuable values and more of resistors and some of even capacitors.?
You'r right, maybe time to upgrade the Raduino too.?
Thanks for the link. I will see how that is done and maybe get some ideas to improve my test software.
All the best,
73, John (VK2ETA)
