Hmm, I used the Grayhill 61C series in a project and it had detents at each quadrature position. I thought that this was standard when detents were used. On Wed, Apr 5, 2017 at 6:54 PM, Bob Blick wrote: > Hi Phil, > > The typical cheap ones have detents in the "both switches off" position. > As you move from detent to detent you get a full quadrature cycle, the > outputs sequentially connecting to common in an order depending on which > direction you are turning. > > They are simple mechanical devices so they bounce and glitch just like an= y > cheap switch. You can hold them(and even balance them) in between detents= .. > Since the ones I use a cheap little things, the exact state while > in-between is not really defined. But pretty much you can count on both > outputs being open when within a detent. > > I decode them so that a single increment or decrement only happens upon > both switches opening. Getting maximum resolution (X4) is not reasonable = or > desirable on these type of encoders. > > Cheerful regards, Bob > > ________________________________________ > From: piclist-bounces@mit.edu on behalf of Phil > Keller > Sent: Wednesday, April 5, 2017 2:04 PM > To: PICLIST Post > Subject: [EE] Incremental Encoders > > I am looking into a design where I would like to use a single > incremental encoder for two separate controls. In order for me to > accomplish this I need to understand what the outputs (A & B) are held > to when there is no rotation. Are the outputs held OFF (aka open), ON > or one of each based on the last rotation? What happens when the user > rotates the knob very slowly? Is the pulse a fixed width or is it base > on shaft rotational speed? What is the state of the outputs if the > rotation is halted between detents? Is the nominal output state > manufacture dependent or is there a "standard". > > Thanks for any guidance you can provide. > -Phil- > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .