Subject:
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Re: expansion board/multiple sonar
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Sat, 8 Feb 1997 06:06:08 GMT
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Original-From:
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Matt Harlan <MJH10@CORNELL.EDUspamcake>
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Viewed:
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1528 times
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It's actually a '374 or '373 for outputs. I guess you could use them for
inputs too, but you're better off using a '244 for input.
Or even a '574, '573, '541, these chips put inputs on one side and outputs
on the other. Very convenient. Even consider a latched peripheral driver.
Kinda like a '374, but can supply 100mA. Or maybe use the '374 and a
Darlington array. Depending on the array, you can get anything from 300mA
to 1.5A of output on four to eight channels.
If you want multiple sonar, check out this page:
http://www.cs.umd.edu/users/musliner/sonar/
Gives a description for multiplexing the transducers themselves. That way,
you use one polaroid board and one set of IC lines on the 6811. Get a
couple more transducers only. Last I saw they were $20 each. Pretty sure
Wirz sells the transducer seperately.
http://www.wirz.com
Two output lines would give four sonar directions, add one more output and
get eight directions. Plus, you'll spend half as much in the process.
There's even some code for the mutliplexer. I haven't used it, but I'm
sure it's usable. It was originally intended for the 6.270 boards anyway.
Just a thought
matt
At 12:50 PM -0500 2/7/97, John Whitten wrote:
> Hmmm... why not do this? Use a 74273 and tie it to the HB's data lines
> and strobe it with Y0 (or Y2 or Y4)? This would create a latched output
> If you want to set up another input port, you could use a 74373 or 74374
> (depending on whether or not you wanted level-triggered or
> edge-triggered inputs) and wire it up to Y1, Y3, or Y5.
_______________________
Matthew J. Harlan
Cornell University
Electrical Engineering
mjh10@cornell.edu
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Message is in Reply To:
 | | FW: expansion board schematic posted
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| I'd agree with this option - I don't need any more inputs, but I do need 4 logical outputs 2-4 Hi-current outputs Serial communications 1 (preferably 2) sonar connectors I could really use that second sonar. I don't suppose there is a way you could (...) (28 years ago, 8-Feb-97, to lugnet.robotics.handyboard)
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