Subject:
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Re: encoders and analog ports
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Sat, 10 Jul 1999 12:09:11 GMT
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Original-From:
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Fred Martin <fredm@/Spamless/media.mit.edu>
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Viewed:
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676 times
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are you using the .icb version of the analog driver? make sure you are
using the latest set of libraries for the HB from the web site. i'm just
guessing at this point. next follow up, please provide a listing of
exactly what lib files are being loaded when IC boots.
fred
> thanks fred.
>
> i'm now using the servo_a7.icb routines to drive my servo.
>
> i am still experiencing problems with the analog ports.
>
> i have cascading if then else statements that yield varying responses
> from my 5 analog ldr's. i have put printf's throughout these statements
> to work out what is going on.
>
> with the fencrd0.icb file loaded the other analog ports randomly produce
> values on them.
>
> i've turned off my servo (removed servo_a7.icb from the startup) for now
> until the analog ports and fencrd0.icb are sorted out, and the problem
> is still there.
>
> since the fencrd0.icb reprograms the a/d port. could it be reprogramming
> it all the time hence the bogus values on the other a/d ports?
>
> i have replaced the 47K res pack with 100K for a better voltage divider
> on the ldr's. i can't see that causing it any problems.
>
> i've tried a different handyboard to rule out a hardware issue.
>
> i don't even have any code for the fencrd0.icb to use yet. it is just
> loaded at startup.
>
> any ideas?
>
> thanks.
>
> Fred Martin wrote:
> >
> > my shaft encoder routines are not compatible with the old servo routines.
> >
> > please try the new servo routines at
> >
> > http://el.www.media.mit.edu/projects/handy-board/software/libs.html
> >
> > fred
> >
> > > hi there
> > >
> > > i'm not yet receiving this list so could any replies please not leave
> > > out my direct email.
> > >
> > > my problem is thus.
> > >
> > > i've got 5 of the hb's analog ports used by ldr's. they all work fine
> > > and have done so as line detectors for 3 years now.
> > >
> > > i have just recently ripped a mouse apart and am trying to have a shaft
> > > encoder.
> > >
> > > this has also been successful to a certain degree. using the hb
> > > fencdr0.icb i get a nice velocity and everything is fine with the
> > > encoder part.
> > >
> > > however i've found that having the fencdr0.icb loaded the ldr's which
> > > are attached to the other analog ports are returning wild readings. if i
> > > manually in ic, read the sensors analog(1); and such they read back ok.
> > > but since i have my sensor code in a spawned process maybe this has
> > > something to do with it??
> > >
> > > so i'm assuming that the fencdr0.icb is somehow interfering with the ldr
> > > analog readings. spurious readings mean no robot = can't have encoder
> > > running at the same time. bugger.
> > >
> > > has anyone else every run across this problem. i did a search using the
> > > cool mailing search provided and was a bit swamped.
> > >
> > > thanks
> > > aaron.
> > > --
> > > _____________________________________________________________________
> > > Aaron Dwyer
> > > http://members.xoom.com/aarondwyer
>
>
> --
> _____________________________________________________________________
> Aaron Dwyer Stallion Technologies
> http://members.xoom.com/aarondwyer http://easy.stallion.com
>
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Message has 1 Reply:
 | | Re: encoders and analog ports
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| (...) well once again i've learnt the hardway. always get the latest software. downloaded the new libs, and that fixed me up. i was using the libs from when i first started with the hb (years ago). all my analogs are stable again. i am very happy. (...) (25 years ago, 11-Jul-99, to lugnet.robotics.handyboard)
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