Hardware Debouncing for Encoder

[ztnel]

Brief

To improve switching debouncing performance and reduce firmware complexity it is best to add a simple hardware debouncing RC circuit inline with the SW input signal from the rotary encoder. A simple RC circuit as depicted below can circumvent switch bounce vi capacitor charge and discharge. The switching time should be chosen to be ~20ms based on some industry best practices:

Further Reading

https://www.digikey.com/en/articles/how-to-implement-hardware-debounce-for-switches-and-relays