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Path: utzoo!utgpu!cunews!bnrgate!bwdls58!mlord
From: mlord@bwdls58.bnr.ca (Mark Lord)
Newsgroups: sci.electronics,comp.sys.ibm.pc.hardware
Subject: Re: Simple one evening project
Keywords: IBM, PC, floppy drive, LED, in use, color, density
Message-ID: <4748@bwdls58.UUCP>
Date: 29 Oct 90 15:11:39 GMT
References: <1990Oct23.162706.10585@elroy.jpl.nasa.gov<
Sender: mlord@bwdls58.UUCP
Reply-To: mlord@bwdls58.bnr.ca (Mark Lord)
Organization: Bell-Northern Research, Ottawa, Canada
Lines: 33

In article <1990Oct23.162706.10585@elroy.jpl.nasa.gov< cyamamot@kilroy.jpl.nasa.gov (Cliff Yamamoto) writes:
<
<For those who have played with Compaq computers, you'll note that they
<use interesting floppy drives whose in-use LED changes color depending on
<the density of the floppy.  I thought this was pretty useful since I'm in
<such a rush, I rarely pay attention to the floppy label and rely on the
<LED color to determine the capacity.  I liked this feature so much on my
<Compaq at work, I wanted to add it to my 386 at home.  So here's an ASCII
<schematic of what I made:
<                             +5 VDC
<                                |  1/6           1/6
<                               |\ LS04       |\ LS04
<Reduced Write (pin 2)  >-------| >o----+-----| >o-----+
<                               |/      |     |/       |        NOTE: red and
<                                |      V              V        green LEDs are
<                               Gnd     - Red          - Green  actually a
<         ____________                  |              |        single bicolor
<         Drive in Use  >----/\/\/------+--------------+        LED.
<                           220 ohm
<                                       Red = Lo Density   Green = Hi Density

Well, Radio Shack (here) only sells the two-lead type of bicolor LEDs.
With these, the direction of current flow determines the LED color.

Any gurus out there who'd be willing to post an equally quick&clean 
circuit for performing the same function with this two-lead type of LED ?

Thanks!
-- 
 ___Mark S. Lord__________________________________________
| ..uunet!bnrgate!mlord%bmerh724 | Climb Free Or Die (NH) |
| MLORD@BNR.CA   Ottawa, Ontario | Personal views only.   |
|________________________________|________________________|