[sdiy] Selecting a rotary encoder, transistions per detent?
jschwich53 at comcast.net
Sun Feb 9 00:17:33 CET 2020
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.
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.
> On Sat, Feb 8, 2020 at 5:44 PM Jay Schwichtenberg
> <jschwich53 at comcast.net <mailto: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.
> Jay S.
> On 2/7/2020 5:00 AM, Spiros Makris wrote:
>> 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 ).
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