Subject:
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Re:
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Sun, 21 Feb 1999 18:53:45 GMT
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Original-From:
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Will Bain <WILLBAIN@CS.stopspamUMT.EDU>
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Viewed:
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930 times
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Elliot Anderson wrote:
> Has anyone connected more than one sonar sensor to the handyboard? I'm
> looking to use the handyboard to connect six sonar sensors to my pc via the
> parallel port. I'm using C to talk to and readback from the parallel port.
> The sensors can be fired and read in sequence, as long as they can be
> fired and read back quickly.
> I'm using the sensors to grid out a room in order to locate people in a
> space and track their movements. The space is typically about 12' long.
> I'm not a hardware expert, but am somewhat adept at building circuits.
> Therefore, as much detail on how to handle and build this interface would
> be helpful.
I'm still working out the best way to connect two sonar modules to the
HB (using two complete module board/transducer sets). Both modules
ping, but I'm getting signal contention with both echo lines connected
to the same TIC port.
Probably the best way would be to build a simple multiplexor that allows
driving six transducers from a single sonar module board. There's a
Multi-Driver Sonar Schematic by Adam Cox that allows four transducers;
see the HB web site, software contributed section:
http://el.www.media.mit.edu/groups/el/projects/handy-board/software/contrib.html
It seems that, instead of using four digital outputs to drive four
transducers, the circuit could be modified (using inverters) to use only
two digital outputs. Likewise, three digital outs ought to be able to
switch up to eight transducers, and four ought to handle sixteen
tranducers, but I haven't worked out the details. In any case, it's
very important that one and only one transducer is switched into the
circuit at a given moment. Best of luck to you!
-- Will
, ,
__@_/ \_@__ |/
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)\ ) ( \ (\/\\,
~~~~~~~~~ ' ` ~~~~~~~~~~~ ` ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Wendy Parson, Conscience: the inner voice which warns us
Will Bain, that someone may be looking.
& Tatoosh --H. L. Mencken
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Message has 1 Reply:
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| Will - - I'm also working on implementing multiple sonar sensors on the HandyBoard. My intention is to mount 4 transducers using Adam Cox's multiplexor. At present I'm struggling with the software attempting to reduce false readings and increase (...) (26 years ago, 21-Feb-99, to lugnet.robotics.handyboard)
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Message is in Reply To:
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| Has anyone connected more than one sonar sensor to the handyboard? I'm looking to use the handyboard to connect six sonar sensors to my pc via the parallel port. I'm using C to talk to and readback from the parallel port. The sensors can be fired (...) (26 years ago, 20-Feb-99, to lugnet.robotics.handyboard)
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