DIY-EGOR interface

[Bruce Plecan]

All that really matters to me is making it ecm friendly.
Having a 0-1v output with the 14.7 at .44 is the trick.

If you also look at the output it isn't a linear response.
If you want to run a total of 4 of the 10 elements you can beging to cover
the interesting areas for a specific car, but to get a universal type system
the LCD gets reall attactive.

To get the most out of this will take some form of data logging.  Why just
not do the interface once so that it's compatable with all the logging stuff
folks already have?.

Bruce




> Ok, should be doable, will involve a bit more electronics to bias it to
> start at say -3v and go to ~+2V. Would this be a useful display? It
> certainly seems easier to read as a boost gauge than a numeric 60mm
> gauge. I bet it might be easier than reading a LCD, unless the LCD
> refresh rate is slower than 1hz.
>
> -Seth
>
> Bruce Plecan wrote:
> >
> > You'll notice the range for the IC shown is 0-1v
> > the output of the WB, is in the range of -1.x to +.5
> > So the WB output needs *shifted* to an all positive range.
> >
> > From: "Seth" <sethea at mediaone.net>
> > > This is something less than what you would probably ultimately want
for
> > > an interface, but it is easy enough
> > > to build. It's basically a copy straight out of the National
> > > Semiconductor LM3914 datasheet. I have been planning on making a
surface
> > > mount board for a smaller boost gauge, and I have it set to read 0 to
5V
> > > in, but 0 to 1V would be an easy modification.
> > >
> > > my website from when I was considering making 30 element LED
> > > boostgauges... the display would work for DIY-EGOR, if I understand
> > > things correctly.
> > >
> > > http://people.ne.mediaone.net/sethea/MkIVboostgauge.html
> > >
> > > it is a fair sized jpeg so it might take a bit of time on a modem
> > >
> > > the .PDF file of the schematic for the display as set to 0 to 5V via a
> > > voltage divider
> > >
> > > ftp://ftp.diy-efi.org/incoming/boost%20gauge.pdf
> > >
> > > or
> > >
> > > ftp://ftp.diy-efi.org/incoming/boost gauge.pdf
> > >
> > > I guess the %20 is some sort of placeholder???
> > >
> > > If this is of interest or could help, just shout. Again, I was going
to
> > > do a surface mount version of the PCB so I could get a nice looking
> > > (small) Heads Up Display for boost inside or atop the instrument pod
on
> > > my VW.
> > >
> > > -Seth
> > >
> > >
> > >
> > >
> > > Bruce Plecan wrote:
> > > >
> > > > There are 4 in use that I've heard of.
> > > > I've heard of about that number that are under construction, and a
> > number of
> > > > folks saving for sensors, and or saving them for winter projects.
> > > > Bruce
> > > >
> > > > > Bruce-
> > > > > I didn't mean vaporware as in not existing. Sorry for the
confusion, I
> > > > > was having a difficult time finding the words to say what I meant.
> > What
> > > > > I meant was, there aren't many of these built (correct me if I am
> > wrong)
> > > > > and it seems everyone wants to add features. I never meant to
imply
> > that
> > > > > it either didn't work or that there working units.
> > > > > Sorry for the confusion!
> > > > > Seth
> > > >
> > >
> >
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