I am trying to interface a generic (3 pin) rotary encoder with an ESP32. Issue is I am only getting either 0 or 1 (sometimes -1) as the value of the counter when I run my project. I tried using external pullup resistors, and changing the input pins, with no luck.
#1- What is the difference between attachHalfQuad and attachFullQuad? #2- How do I disable the use of interrupts? #3- Do I have to poll the encoder as fast as possible in the loop() function, is that done by calling getCount? #4- Is the encoder debounced?
There is only one interrupt for the peripheral, and that is managed by the library. The user has no interrupt interface, and no interrupts are generated on each pulse. Interrupts arrive when the 16 bit counter buffer overflows, so this library has a tiny interrupt footprint while providing support for up to 8 simultaneous quadrature encoders.
This hardware peripheral supports only 8 encoders.
The "switch style" encoder wheels used by breakout modules such as:
need electrical debouncing in the range of 0.1 - 2 uf per encoder line to ground. This device bounces much more than the PCNT hardware modules debouncing time limits. Be sure to setFilter() to 1023 as well after attaching in order to get the maximum hardware debouncing.