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

[Spiros Makris]

Thank you Jay, I have look at that datasheet. Indeed what is shown is how
my encoder behaves (rests at either 00 or 11when turned). My confusion
stems from the fact that the bourns encoders also have the same waveforms
in the datasheet even though they don't work in a similar fashion.
Is there any algorithm that can successfully read both types of encoders?
I am looking for a smooth encoder with a very light touch. I'm guessing I
need to look for no detents first. What about the "hardness"? I suspect
that's specified by the torque, and I'm looking for the lowest one
possible?

Spiros

On Sun, Feb 9, 2020 at 1:19 AM Jay Schwichtenberg <jschwich53 at comcast.net>
wrote:

> Shawn,
>
> Thanks put I understand encoders and have all sorts of code for encoders.
> Embedded HW/SW stuff was my day job for a number of years.
>
> Thanks
> Jay S.
> On 2/8/2020 3:04 PM, Shawn Rakestraw wrote:
>
> 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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