🚀 go-pugleaf

"Rod Speed" <rod_speed@yahoo.com> wrote in message news:<bltkuj$g1593$1@ID-69072.news.uni-berlin.de>...
> "Cory Seligman" <coryms+google@azazel.eng.monash.edu.au> wrote in message news:a64581c0.0310052014.27d17e70@posting.google.com...
>  
> > The optical mouse sensor idea is something I already thought
> > of, but the specs for some of the modules they use show
> > fairly lousy repeatability, which I guess amkes sense.
> 
> Makes no sense at all, you dont see any problem like that using a good one.

hey, yeah. You're right. They have good repeatability. I'll give em a
go for the next version of the prototype. As it is now, I have the 75
lpi encoders and they work fine with laser printed stripes.

> > I need pretty good (0.5 mm or so) repeatability.
> 
> Should be completely trivial with a decent optical mouse
> and the most you might want to do is make sure that what
> you are running it on isnt dead smooth like glass etc.

Yeah. It's machined steel, and an optical mouse picks it up fine. I do
have pretty limited space though, and it'd be a tight squeeze with the
sensors used in the mouses I've looked at so far. I'm sure they make
tiny ones though....

> > I have yet to have any success with ink jet printer on transparencies.
> > The ink is either too think, blobbing up and obscuring the gaps, or
> > not dark enough to block the reflection. Perhaps I need better
> > stationary.
> 
> Yeah, thats completely trivial to do properly too. Basically
> just the right combination of transparent film and ink.

Yeah, I assumed so. But the combination I had was lousy. 

Anyhow, it's all moot now, since the 75 lpi stuff all works fine, and
the laser printed stripes are nice and clear when glued to the steel
rod.

thanks anyhow,
         cory