Subject:
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Re: Connecting a second sonar module
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Sat, 21 Mar 1998 21:30:21 GMT
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Original-From:
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Will Bain <willbain@cs.umt.(StopSpammers)edu>
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Viewed:
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1441 times
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In response to my question about connecting two Polaroid sonar modules to
the HB...
At 08:51 AM 2/5/98 -0500, Fred Martin wrote:
<snip>
> you might be able to get away with some signal multiplexing, assuming
> you're only firing one sonar at a time. i could see the BINH being no
> problem. For sharing the ECHO, make sure the polaroid outputs are
> open collector so there isn't signal contention.
Could someone please explain to an electronics bonehead like myself the
following:
(1) What is meant by open collector (and what is the alternative)?
(2) How can I determine whether the Polaroid 6500 module ECHO output is open
collector (the IC is a TL851 PID614904 DIGITAL, if that helps)?
(3) What sort of signal contention might there be if it's not open
collector, and could the situation be remedied with a couple diodes, like this?
module 1____|\|____
ECHO |/| \
diode \________Handy Board
/ Port A0/TIC3
module 2____|\|____/
ECHO |/|
diode
(4) If the above boneheaded scheme were to work, what sort of diode would I use?
(5) Would there be any problem splitting the BINH signal to go two modules
like this?
_______module 1
/ BINH
Handy Board____/\ /\ _____/
Port D4 \/ \/ \
1 kOhm \_______module 2
BINH
Thanks again to all the electronics experts out there who help keep us
boneheads from frying our circuits more often than necessary.
--Will
, ,
__@_/ \_@__ |/
| /__, o @_/
)\ ) ( \ (\/\\,
~~~~~~~~~ ' ` ~~~~~~~~~~~ ` ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Wendy Parson, You can't say civilization isn't advancing;
Will Bain, in every war they kill you in a new way.
& Tatoosh --Will Rogers
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