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 Robotics / Handy Board / 4178
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Subject: 
Re: Sonar Help!
Newsgroups: 
lugnet.robotics.handyboard
Date: 
Tue, 21 Jul 1998 04:15:15 GMT
Original-From: 
Sheridan Edward Ethier <seethier@^spamcake^zeus.UWaterloo.ca>
Viewed: 
1107 times
  
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)?

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






Message has 1 Reply:
  Re: Sonar Help!
 
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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