10 LED O2 monitor

[Bruce Plecan]

> The 3914 chip used basically uses a 10 step resistor divider network and
> 10 comparators to decide which segment to light.  The default input
> range is 0-1.2V, but that can be changed to anything "reasonable" like
> 0-5V, etc.  So the answer is yes, it will work with any circuit that has
> an analog output.  I "think" both flavors of UEGO have an output voltage
> in the 0-1V range so this circuit should work pretty well out of the box
> with either one.

I can speak for the DIY EGOR.
At this stage no.
It's to be used with a DVM.
Once you look at the drawings it will appear why.
When it's to the stage of having a ecm interface, then you might entertain
something like that.  BUT,  again you'll only be interested  in a particular
range,  rather then the whole spectrum, or possibly several areas.  To get
the proper resolution will take work to get a LED *right*.
Also, realise it will take alot of damping to slow it down enough for human
to read.  The WB seems to be alot faster reading, then a switching type, as
least as far as my totally unscientific eyes go.  Was easy to see the
individual cylinder firings at idle.
I can see where for the human end a quickly decaying peak and hold item
might be the hot trick, rather then just capacatance.
While harder to read a LCD might be the best answer so you have enough
dynamic range.
HTH
Bruce

  If not the app notes at National have details about
> changing the input range.  For more info go to www.nsc.com and search
> for LM3914.
>
> I think JC whitney and others sell basically this design in the $20
> range, so unless you like building stuff you might just consider buying
> one.
>
> --steve
>
> "Romans, Mark" wrote:
> >
> > Any way to make this work with an EGOR?
> > ----- Original Message -----
> > From: "steve ravet" <sravet at arm.com>
> > To: <gmecm at diy-efi.org>
> > Sent: Tuesday, November 07, 2000 1:21 PM
> > Subject: Re: 10 LED O2 monitor
> >
> > > Try this link:
> > >
> > > http://diy-efi.org/diy_efi/projects/O2_LED/O2_LED.html
> > >
> > > Be warned that these types of meters are of limited use.  They'll tell
> > > you rich/lean but that's it.  If you connect it to an EFI car you'll
be
> > > able to see the ECM command the mixture back and forth across stoich.
> > >
> > > --steve
> > >
> > > > Mathieu Blais wrote:
> > > >
> > > > hi,
> > > >     I'm really brand new to tbi injection, seems like I'll really
get
> > > > into programming prom and modifying prom aswell, I just found the
> > > > diy-efi www and I was reading the papers. I found out that there is
> > > > somewhere a GN Type tech area where I could maybe find the schematic
> > > > on how to build the 10 LED O2 monitor. I would really like if
someone
> > > > can tell me where I could find that, because the link doesn't work.
> > > > Thanks all
> > > >
> > > > Math B
>
> --
> Steve Ravet
> steve.ravet at arm.com
> ARM,Inc.
> www.arm.com
> --------------------------------------------------------------------------
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