Most RTs also has built in ‘push-on’ momentary switch ... I will not go into greater detail of the code behind the rotary encoder + arduino experiment, as featured articles and great tutorials are ...

I have to thank one author of a rotary encoder decoder (Ben Buxton). While his code seemed overly complex to my untutored eye, for example creating a new data type, it did show Arduino-novice me two ...

Adafruit has made an I2C interface for four rotary encoders ... “You can use our Arduino library to control and read data with any compatible microcontroller. We also have CircuitPython-Python code ...