Decrement not working and debouncing problems

[stylesuxx]

I loaded the example code on my Arduino UNO and I have a 470nF capacitor between CLK and GND - this does not seem to be enough for proper de-bouncing.

Also I experience a much stranger issue - no matter which direction I turn my encoder, the value is always going up, it is never being decreased.

I tried with different encoders (of the same type) and they all do the same thing.

Am I missing something?

Those are the encoders I am using => https://www.amazon.de/gp/product/B07T3672VK?ref=ppx_pt2_dt_b_prod_image

[stylesuxx]

Instead of triggering the ISR on FALLING, I trigger it on LOW. Additionally I added some de-bounce in software - this resolves my issues.

[ExileFox]

I have had better luck with https://github.com/mathertel/RotaryEncoder - however, it has no support for pushbuttons - As i'm using KY-040 enc's i'm borrowing the button code from this but use the other library for rotation. It might not be pretty. but it works.