site with mouse encoder remounted on a pot bushing: http://members.shaw.ca/swstuff/mouse.html cheers Lawrence VE7IT
On Fri, 2008-06-06 at 08:52 -0700, Tom Lackamp wrote: > Hi, David, > > Thanks very much for the great information. > > I'll consider an A+B+Z wheele for the next version of the program. > In the interim, you can build one using the Custom wheel type, > entering your track data as strings. > > I recommend that you build your strings externally, using your > word processor, and copy them into the track boxes after you've > checked them carefully (and saved them for future reference.) > > I like your idea about gluing the wheel to another piece of > plastic. I've purchased some transparency stock on eBay, > but it's fairly thin. Some reinforcing is in order, and it sounds > like your idea is the way to go. > > I was unable to find the article that shows how to mount a codewheel > using a pot, but oddly enough, my first thoughts about wheel > mounting were based on a salvaged pot bushing, mounting nut, > and washer. I've drawn up a little sketch. I'll email it directly > to you. > > Thanks again! > > Tom > > > drmail377 wrote: > > > > Hi Tom, > > > > Nice program! However, often hardware and/or software decoders can be > > made simpler if the code wheel contains an asynchronous track that > > provides the oversampling clock signal, these are often called A+B+Z > > quadrature encoders. I don't see any wheels on your Web page that > > provide the Z clock signal. > > > > Here is a link to a page with a good explanation of decoding: > > > > www.fpga4fun.com/QuadratureDecoder.html > > > > Here is a link to an encoder with A+B+Z outputs: > > > > www.cui.com/adtemplate.asp?invky=455913 > > > > You might want to mention that if you print the code wheel to a piece > > of overhead transparency film, the wheel can then be glued to a thin > > clear plastic disk you cut from the lid of a food container. The > > transparent code wheel is then easily used with transmission > > opto-detectors salvaged from a cheap mouse. Sometimes the mouse will > > even have decoder chips on them that can be re-used. > > > > Lastly, a while back I stumbled across a page that gave detailed > > instructions on how to build an encoder using a code wheel mounted to > > the dismantled shaft of a standard through-hole mounted potentiometer. > > But now I can't seem to find it again. Have you seen this page? If-so, > > perhaps you have a link. > > > > 73's, David > > > > > ------------------------------------ > > Yahoo! Groups Links > > >
