Subject:
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Re: Handyboard Expansion Sonar Issues
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Sun, 7 Feb 1999 16:45:42 GMT
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Original-From:
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Nick Taylor <ntaylor@iname.com>
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Viewed:
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780 times
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Look at these:
http://el.www.media.mit.edu/projects/handy-board/software/sonar.html
and
http://el.www.media.mit.edu/projects/handy-board/hbexp30/software.html
I also added a 100uF cap across the supply as shown in this link:
http://www.robotics.com/arobot/sonar.html
Others suggest ana even larger cap. (470uF), but I haven't had any
problems with power sag until the batteries are almost discharged.
- - - Nick - - -
"Terry P. Gathright" wrote:
>
> Hello,
> Where do I look for the directions for connecting the Polaroid sonar to the
> expansion board.
>
> <put the capacitor c7 (0.1uf) in the sonar board, as indicated
> in the directions? >
> Thanks
> Terry G.
>
> ----------
> > From: William Bain <willbain@cs.umt.edu>
> > To: handyboard@media.mit.edu
> > Subject: Re: Handyboard Expansion Sonar Issues
> > Date: Friday, February 05, 1999 12:57 PM
> >
> > On Fri, 5 Feb 1999, Nick Taylor wrote:
> >
> > > jdunn@unm.edu wrote:
> > > > <snip>
> > > > There is a very high probability that you plugged the foil cable in
> > > > backwards. Doing so, even for a moment, will destroy the IC chips.
> > >
> > > Please explain. Now I'm worried about damaging my sonar board. Since
> > > the foil cable has conductors on only one side, I didn't think that it
> > > was possible to plug it in "backwards" and still make an electrical
> > > connection.
> > >
> > > My understanding of the hookup is as follows:
> > > On the HB Expansion Board pin 1 (gnd) of the Polaroid connector is
> > > toward the top of the board. On the Polaroid Ranging Module pin 1
> > > is toward the left. If the foil cable is connected so that the
> > > dotted edge of the cable is nearest the pin 1 end of each connector,
> > > I fail to see how there is any danger of damaging the sonar board.
> >
> > It's possible that the flat flex cable could make electrical contact
> > either way, since the socket has "teeth" in it that could penetrate the
> > insulation on the one side of the cable.
> >
> > And *don't* trust that the dotted edge is the correct one; I ordered the
> > pair of sonar kits, and it came with one cable correctly marked and the
> > other cable incorrectly marked.
> >
> > Just make sure that pin 1 as marked on the sonar module board ends up
> > connected to the corresponding pin on the expansion board. If you're in
> > any doubt, check the circuits and verify that V+ goes to V+, GND goes to
> > GND, etc. I hope this helps.
> >
> > --Will
> >
> >
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