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 16:16:39 GMT
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Original-From:
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Terry P. Gathright <669@worldnet.att=StopSpam=.net>
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Viewed:
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2898 times
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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.
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> 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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Message has 2 Replies:
 | | Re: Handyboard Expansion Sonar Issues
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| Look at these: (URL) and (URL) also added a 100uF cap across the supply as shown in this link: (URL) suggest ana even larger cap. (470uF), but I haven't had any problems with power sag until the batteries are almost discharged. - - - Nick - - - (...) (28 years ago, 7-Feb-99, to lugnet.robotics.handyboard)
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