Phil,

 I'm not an expert on incremental encoders, but most encoders I have
worked with output GRAY CODE,=20
 ie, only one bit changes at each detent.
 The outputs connect to ground, so they need a pull-up resistor from
each output to Vdd.
 And regarding the output state when not moving, they remain in the
state that the last=20
 rotation left them in. =20

 Regards,

 Jim

> -------- Original Message --------
> Subject: [EE] Incremental Encoders
> From: Phil Keller <phil@pkeller.net>
> Date: Wed, April 05, 2017 4:04 pm
> To: PICLIST Post <piclist@mit.edu>
>=20
>=20
> I am looking into a design where I would like to use a single=20
> incremental encoder for two separate controls.  In order for me to=20
> accomplish this I need to understand what the outputs (A & B) are held=20
> to when there is no rotation.  Are the outputs held OFF (aka open), ON=20
> or one of each based on the last rotation?  What happens when the user=20
> rotates the knob very slowly?  Is the pulse a fixed width or is it base=20
> on shaft rotational speed?  What is the state of the outputs if the=20
> rotation is halted between detents?  Is the nominal output state=20
> manufacture dependent or is there a "standard".
>=20
>    Thanks for any guidance you can provide.
> -Phil-
> --=20
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