Subject:
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Re: Handy Board newbie looking for ways to expand digital I/O
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Sun, 27 Sep 1998 18:47:33 GMT
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Original-From:
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The Plumber <jhoffman@itIHATESPAM.sait.ab.ca>
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Viewed:
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1131 times
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Try this:
http://el.www.media.mit.edu/groups/el/projects/handy-board/faq/index.html#digout
works for up to 3 more 8 bit ports identical to the motor one.
Thanks,
Joe Hoffmann
E-Mail jhoffman@it.sait.ab.ca
On Sun, 27 Sep 1998, Ozan Cakmakci wrote:
>
> Hi all,
>
> I've started playing with the Handy Board last week and needed more
> digital outputs then provided. After a quick look at the schematics,
> FAQ's and the manual, I decided to disable the motor circuitry and
> use the latch mapped to address 0x0e to get 8-bit digital out. This
> worked for me. However, I need 16 more digital outputs so right now
> I'm tending towards using an MC6821 as a"bus expander". I have never
> worked with the 6821 before so any comments on that would be welcome.
>
> Ozan
>
>
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