[sdiy] Rotary encoder reading.. hardware solution (fast & accurate)

Oren Leavitt obl64 at ix.netcom.com
Wed Aug 11 23:41:06 CEST 2021


Some PICs have one or more Configurable Logic Cell (CLC) peripherals. 
You might even be able to configure that logic within a CLC.

- Oren

On 8/11/21 3:27 PM, Jean-Pierre Desrochers wrote:
> For anybody who could be interested..
> Just found this video yesterday and tried the circuit..
> https://www.youtube.com/watch?v=UlehqasO-fo&t=1471s 
> <https://www.youtube.com/watch?v=UlehqasO-fo&t=1471s>
> Outputs A and B (CD4013) connected to PORTB of a PIC16F1783
> (RB0 and RB1) using interrupts on change (rising edges).
> Now I only have to check one incoming pulse on each RB0 & RB1
> to increment or decrement a counter.
> Much faster than computing  all the 4 possible states in each encoder step
> to finally get a result.
> My interrupt uses TIMER1 (1msec steps), RB0 & RB1 on change.
> No missing counts anymore even rotating fast, on both direction.
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