[sdiy] Selecting a rotary encoder, transistions per detent?

[Shawn Rakestraw]

I don't know if this will help you or not, but I have just assembled two
projects that use Teensy microcontrollers. This is the encoder that I used.
I can't say for sure how it outputs the signals.

https://www.mouser.com/ProductDetail/858-EN11-HSM1BF20

Shawn

On Sat, Feb 8, 2020 at 5:44 PM Jay Schwichtenberg <jschwich53 at comcast.net>
wrote:

> At least for the Alps pg 267 in the data sheet on the Mouser web site show
> you what's going on. This is pretty standard for this type of encoder.
>
> https://www.mouser.com/datasheet/2/15/alps_alps-s-a0008379064-1-1733314.pdf
>
> Jay S.
> On 2/7/2020 5:00 AM, Spiros Makris wrote:
>
> Hello,
> I am putting together a teensy application that uses rotary encoders. I
> picked up two different ones from my local shops, but they seem to have a
> different output waveform scheme.
> One is an EC11e15204a3 alps (according to the guy selling it) and on each
> detent, the outputs switch between high and low. So, 00->11->00 and each
> transition from 00 to 11 and vice versa happens when you hit a detent.
> The other is a bourns by the looks of it, and works differently: When
> resting, it defaults to 00. When turned, it briefly becomes 1, then returns
> to 00.
> (obviously, the turn direction is detected during the transitions).
> The second type detects two increments instead of one, as a result.
> Where in the datasheet is this specified? Both are sold as "2 channel
> quadrature outputs" but the detection code is slightly different (unless
> I'm missing something?). Is there code that can work with both? I am using
> polling and shift registers and don't need any significant accuracy- the
> delay so far feels great.
> Is there a cheaper alternative to the 5pin arrangement of the EC11? It
> seems that those without switches only have 3 pins- they will be going on a
> prefboard and the extra support would be welcome (I'm not compelled to
> drill 64 holes for the side supports :P ).
>
> Regards,
> Spiros
>
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