EGOR Interface - Display

[944Technologist]

Bruce,

The A/D and the digital display are actually the easy part. Do we have the
data for the ROM? For an 8-bit A/D, we have 256 data points to plot. For a
12-bit A/D, we have 4,096 data points to plot. The non linearity of the
sensor data can be easily compensated by the ROM. It is a simple look up
table just like the ones used in fuel maps of your ECU.

So we need either 256 or 4,096 data points to put into the ROM. Does anyone
have that data? I suggest we start with the 8 bit A/D and later, go bigger
if we can get the data to support it.

FR Wilk
_______________________________

From: "Bruce Plecan" <nacelp at bright.net>
>
> Fine!,  sketch something out, and I'll start on it as soon as I can get
> parts.
> Sounds great, just tell me how to do it.
> They fly in the ointment is some folks can build, but aren't versed in the
> design end.
> Give me a 0-1v output with 14.7:1 switching at .44v, and I'll be running
the
> WB just to wear it out.
>
> I even have the perfect LCD
> 3-1/2D  LCD
> PM-128
> all it needs is 9v, and an input voltage.  Already has voltage dividers in
> it.
>
> With the 0-1v we can use an analog meter and recal for a readout.
> BUT, WE something.   We need something with a slow enough refresh rate
that
> things are less then a flicker.
> bruce
>
>
> > Display? How about a simple ROM look up table. You can accommodate any
non
> > linearity's by storing the calibration factors in the ROM.
> > Example. Use a 12 bit A/D converter on the 0V to 1V output. Use the
> digital
> > output to address the ROM. Add a simple digital display driver to the
> output
> > of the ROM. You can have several curves stored in the ROM:
> > 1. Analog voltage
> > 2. Lambda
> > 3. Air Fuel ratio
> > A simple switch that changes the upper address to the ROM will allow you
> to
> > switch between the three.
> > FR Wilk

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