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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Fri, 9 Jul 1999 14:48:52 GMT
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Original-From:
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Aaron Dwyer <AARON@STALLION.OZspamless.AU>
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Viewed:
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836 times
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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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