[sdiy] Need goog working rotary encoder in C code..

John Speth johnspeth at yahoo.com
Fri Aug 6 20:15:53 CEST 2021

On 8/6/2021 8:46 AM, Jean-Pierre Desrochers wrote:
> I’m doing some tests on a rotary encoder and a PIC16F1783.
> A standard Bourns encoder like THIS 
> <https://www.google.ca/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwjyoqDF3JzyAhUmhOAKHf3lAzoQFnoECAoQAw&url=https%3A%2F%2Fwww.bourns.com%2FPDFs%2Fpec11l.pdf&usg=AOvVaw2RyieyzPnujiOTS7LBcbpw> 
> .
> Connected using 2 x 10k pullups with 0.01uf caps to ground
> to PORTB of the micro. Interrupt calls (falling edges) used on encoder 
> pins A & B.
> I struggled so far to get clean increments/decrements out of it.
> Many missing counts occur..
> I tried many source codes on the web with no luck..
If you're missing counts, it could be due to:

1. Insufficient MCU compute capacity

2. Inefficient or buggy interrupt handler

3. Excessive switch bounce


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