Subject:
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Re: Sonar Help!
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Fri, 24 Jul 1998 17:23:12 GMT
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Original-From:
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Sheridan Edward Ethier <seethier@zeus.*NoMoreSpam*uwaterloo.ca>
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Viewed:
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1140 times
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Fred,
I decided not to use the external battery for now and try and get the
sonar working using the directions on the web page. Instead of connecting
the power throught the Motor Power header, I have simple connect V+ and
GND to TIC3's PWR and Grnd (and excluded the diodes). BINH and INIT are
connected to D4 and D5, resp.
The sonar_sample() call just seems to give random numbers between
-327676 and
+32767. However, sonar_closeup() gives the same sort of values EXCEPT when
I put something close to the transducer. In this case, I tend to get either
2191 or 2639, consistently. If, I move the object away, it goes back to
random values. I have tried changing VR1
(though I have no idea what it does) and these results haven't changed.
The voltage across V+ and GND is 5.0V and HB GND and Sonar GND are the same.
Any ideas?
Sheridan
On Tue, 21 Jul 1998, Fred G. Martin wrote:
> In your message you said:
> > I have tried the official Handy Board Sonar hookup from the Web sie and
> > didn't get very good results. Most of the time,
> > the sonar would produce seemingly random numbers (including negatives).
> > Every once in a while, it would give a constant value of 302-600 when
> > something was put close but didn't seem to change as the object was moved
> > closer or farther away. The only variation (I think) I did was used
> > 2.5A diodes instead of 3.0A.
> >
> > Also, I cut the motor power trace to use an external battery. Do you still
> > recommend using the "official" hookup by basically tying the sonar's
> > V+ and Gnd to external battery (9V)?
>
>
> what kind of ext batt are you using? are the diodes in series with
> that? what voltage do you have on the sonar when it's in operation?
> are the sonar's ground and the HB's ground connected?
>
> fred
>
>
> >
> > If you could help, I'd appreciate it greatly. From looking at the mail,
> > it seems most people get it to work easily. I have not been so lucky!
> >
> > Sheridan
> >
> >
> > On Mon, 20 Jul 1998, Fred G. Martin wrote:
> >
> > > why don't you use the directions at
> > >
> > > http://el.www.media.mit.edu/projects/handy-board/software/sonar.html
> > >
> > > ?
> > >
> > > this is the "official" way to interface the sonar to the HB.
> > >
> > > Fred
> > >
> > >
> > > In your message you said:
> > > > Hi,
> > > >
> > > > I am having problems getting my Polaroid sonar to work properly.
> > > > Following Kent Farnsworth's directions, I have hooked up the sonar:
> > > >
> > > > Sonar ====> Handy Board
> > > > ECHO TIC3 (Top position)
> > > > V+ TIC3 (Middle)
> > > > GND TIC3 (Bottom)
> > > > INIT PIN 9 of 2nd L293DNE socket
> > > > BINH ---1K--- PIN 1 of 2nd L293DNE socket
> > > >
> > > > Installed a 0.1 uf capacitor in C7.
> > > >
> > > > After running Kent's sonartst.c, the transducer makes the ticking
> > > > sound and 213" is displayed on the LCD. Unfortunately, it doesn't
> > > > change! If I unplug the ECHO, the display goes to 0". If I apply
> > > > a voltage to where the ECHO is supposed to be, I can produce varying
> > > > distances between 0" and 213".
> > > >
> > > > Does anybody know what is going on?
> > > >
> > > > Sheridan
> > > >
> > > >
> > >
> >
>
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Message is in Reply To:
 | | Re: Sonar Help!
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| In your message you said: (...) what kind of ext batt are you using? are the diodes in series with that? what voltage do you have on the sonar when it's in operation? are the sonar's ground and the HB's ground connected? fred (...) (26 years ago, 21-Jul-98, to lugnet.robotics.handyboard)
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