I have an inexpensive 600 PPR rotary encoder, like these ones found on Amazon.
It is powered by a 5V pin of an Arduino Uno.
I was unable to detect any rising edges on the signal pins and they never got high. So I connected them to an Analog Discovery 2 Oscilloscope, and, although I'm getting some signals and their timings make sense, their shape does not look right.
- The voltage somehow gets lower instead of getting high.
- The steps are not square at all.