Re: Heads up display

[Dan Gentry <dang@seanet.com>]

Again, see below.

Ken Kelly wrote:

> Dan,
>         Just a couple of comments.
>
> 1) The 16188051 in your camaro puts out 4000 pulses per mile for your
> speedo. It is not a sign wave. It is a digital pulse.
>

As I read it in the manual, it's a sine wave from the sensor, then a digital signal from the
computer to the speedo.
Question: Is it 0V (low) and 5V (high) or 0V(low) and 12V(high)?

Question: If it's 4000 pulses per mile, then I've got the following formula to go from pulses
per second to MPH...

    MPH = (Hz * 360) / 4000

    So

    60.003 MPH = (66.67 Hz * 3600) / 4000

    1.008 MPH = (1.12 Hz  * 3600) / 4000

Am I thinking about this correctly?


>
> 2) Something is wrong with your info on the japanese HUD display. It
> could not work with 2 pulses per mile. How could it possible integrate
> things well enough to put out a speedometer reading. At 10 miles per
> hour, it would only get 20 pulses per hour! Maybe it is pulses per
> speedometer cable revoloution in the Mechanical speedometer
> applications. Mechanical speedometer use 1000 revolutions per mile, so
> the 4 pulse per revolution would be 4000 pulses per mile.
>

That's kinda what I was thinking, but I didn't have any information on foreign car's VSS
setups.  They asked for my make of vehicle, engine type, and year, and sent it off to their
"Engineer" who said that it wouldn't work.  Good think I didn't waste the $190.

>
>                 Ken
>

Thanks, Ken.

Dan


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