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From: tindle@ms.uky.edu (Ken Tindle)
Newsgroups: sci.electronics
Subject: Design a bar graph
Message-ID: <16307@s.ms.uky.edu>
Date: 3 Nov 90 04:03:30 GMT
Reply-To: tindle@ms.uky.edu (Ken Tindle)
Distribution: na
Organization: U of Kentucky, Mathematical Sciences
Lines: 19

I have three binary lines, for eight possible states (yeah, oh wow).  How
can one light seven LED's from this, with zero having all LED's off and
seven lighting all seven of them, in bar graph fashion?  A dot display is
easy, but bar is tougher.  As a final touch, one should tax each digital
line with but one standard TTL load. 

I can think of two ways to implement this, but they both seem like too many
parts have to be used.  I wonder if anyone has a brainstorm out there.  It's
a bit surprising how tough this problem was (at least to me).

In real life, it wouldn't be a big deal to just use a moving dot, but I like
to tell Joe A. Electron what to do, not have him laugh at me.  I hate it
when that happens! 

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INTERNET:tindle@ms.uky.edu | "Could you please continue the petty bickering?
BITNET: tindle@ukma.bitnet |  I find it most intriguing."   ---    Data, 
Ken Tindle - Lexington, KY |  Star Trek, The Next Generation, "Haven"
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