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RE: Speedometer - transparent first-surface reflector needed!
The bonneville SSEI' s (yes the eaton supercharged 3.8's came with hud also
Mike Rolica
Meridian Magnesium Products
Strathroy, Ont
Ext. 260
-----Original Message-----
From: Dave Zug [SMTP:dzug@delanet.com]
Sent: Saturday, February 26, 2000 12:23 AM
To: gmecm@diy-efi.org
Subject: Re: Speedometer - transparent first-surface
reflector needed!
I'm not sure if this helps, but in 89 and 90, the first HUDs
went on the
Grand prixs as an option, and on turbo GP's standard. the
glass on the turbo
GP was this special type I guess cause it costs $700 to
replace today. a
sticker comes on it "polished for HUD"...
I know on the later cars equipped with HUD there is a PATCH
of glass where
the HUD shines, insted of the whole windshield being
polished. maybe the
early windshield was only ploished and this one had the
special material...
anyway, my third source may be only in my head, I thought I
saw a sticker
like thing on the windshields of a 95 or so grand prix.
maybe they thought
it was good nuff, maybe its more correct than what you are
talking about.
I started a project to take the ALDL and push a certain byte
to a pair of
7-seg LCD's for a gerry-rig HUD. It was for the buick GN.. I
had the stream
reading accurately - needed to keep going but the car
started shaking and
spewing black smoke and I had to dump it on some
sucker...... JUST KIDDING
BRUCE! get up off the floor now ;-)) .
Last I'll say, on the subject of cool instrumentation, I
once saw a triple
guage LCD setup specifically for automotive use on a
website. the first
guage was 360 degrees around, the other 2 were 150 degrees
or something. the
LCD came with drivers for uP use. I thought that was cool.
I'm sorry I dont
have info on its maker. It was a flat panel about 3" by 5".
I dont think it
was masked, I think it was totally pixel graphical.
thats 4 posts for me, another friday night ;-(
----- Original Message -----
From: mike mager <mikemager@hotmail.com>
To: <gmecm@diy-efi.org>
Cc: <fanglers@xephic.dynip.com>
Sent: Friday, February 25, 2000 5:03 PM
Subject: Re: Speedometer - transparent first-surface
reflector needed!
> cwagner asked the GM ECM list: (gmecm@diy-efi.org)
>
> >Does any one have any good ideas on making a digital
> >speedometer, preferably one that can be mounted in a
heads-up
> >situation? More gadgets to fight with, but they are fun.
>
> Alright! I've got to 'grab' this one!
>
> I am a guy that is completely fascinated by all types of
instrumentation.
> In 1972, or so, back in high school, I was completely awed
by a Detroit
> concept vehicle with full digital read-out instrumentation
(probably
filled
> the trunk with electronics?). That was the beginning . .
.
>
> I went on, by 1978, to learn how to build such instruments
myself, using
> 'discrete' MSI ICs (very bulky, un-calibratable,
unreliable,
> power-consuming, heat-generating and
temperature-sensitive, and just
> generally bad). I almost figured out MCUs and CPUs in
1981, but it was so
> exotic and expensive, that it took me a few years to get
back to it, and
> then it was, "Oh, yeah, I see how it works, that's easy!".
Now I think
> nothing of buying PIC in the UV EPROM package, doing a
small bit of
assembly
> language coding, a small bit of hardware, and having a
working circuit.
> Digikey works wonders.
>
> I have built a fairly complex instrument system for
automotive use, and it
> certainly is no big deal. I am successfully
procrastinating the
(absolutely
> necessary with this level of complexity) systems analysis
for a very
> complete, complex, complicated, and worse system (but I
think of it
often).
>
> Somebody else may have already been done answering by now,
but . . .
>
> I like to say "head-up display", because I only have one
head, but most
> others refuse! I did build a head-up display for my
speedometer a few
years
> ago, and I found a (known) problem:
> I had my development board loose on the top of the
instrument panel, and
one
> night I noticed a reflection of the three ~1" green
seven-segment LEDs in
> the windshield - wow, HUD!; I went in, connected a
one-bit input switch,
> and changed the code to read it, and to select my original
seven-segment
> bitmap, or to select a mirror-image bit-map - you may have
seen this done
on
> the police RADAR displays, to be readable in the rear-view
mirror. There
in
> a short time, I found the problem.
>
> The problem was that the windshield has (at least) four
reflective
surfaces
> (think of a first-surface mirror for LASER vs. a regular
mirror, and add
> laminations), and I got way too many reflections - but it
did 'work'. A
> 'real' HUD uses a transparent first-surface 'reflector'
adhered to the
> windshield - now, where can we get one? I see that like
the 1992 or so
> Nissan 240 SX had HUD, with that proper reflector, and
that they are now
(I
> believe) out of production; I was told that they were too
expensive
because
> of the 'special' windshield, so, that is not a source of a
separate
> reflector.
>
> Please give more specific details, if you have any (I
could hardly stand
> another project, but . . . ), and maybe we can each build
one.
>
> We need to find a transparent first-surface reflector!
>
> Mike
> ______________________________________________________
> Get Your Private, Free Email at http://www.hotmail.com
>
>
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