Interfacing of Rotary_Encoder with LPC2148

[ganesh22]

Hi all,

I am working with Rotary Encoder model number ALPS EC11E09244BS, interfacing with LPC2148,I got a pattern in LCD as 00,11 between these state a small transition occurs while changing state from 00 to 11 its changes from 01 and 11 to 10. But these are get in slow transition only.
my pattern in very slow transition in forward as 00,01,11,10,00,01,11,10 , in reverse manner 00,10,11,01 and continues.
But i can't get it stable on speed transition also i am using interrupts on two pins. If anyone known this means reply to me .

Thanks in Time,

Regards,
Ganesh

 

[niala72]

It is gray code

 

[andre_luis]

The cyclic pattern [00,01,11,10] is the standard behavior of the rotary encoder ALPS EC11E09244BS, exactly as you pointed above.


**broken link removed**

+++

 

[ganesh22]

Hi andre_teprom,
I got the pattern when i rotate it very slow manner,if I rotate some speed it neglects the transition states 01,10 thats my problem.
I am also added some delay using timer.

 

[HTA]

see also: https://www.edaboard.com/threads/313963/

Enjoy your design work!

 

[ganesh22]

Hi HTA & andre_teprom,

Thanks for your response, i got the output for a specified pattern, now i am going to interface with my modules & also work for push button on rotary encoder.

 

[davidgrm]

Hi
Take a look at this page: https://www.dghacks.com/micro-controller/quadrature_encoders/
It explains how to avoid those false readings etc.