> -----Original Message-----
> From: Impakt242@AOL.COM [SMTP:Impakt242@AOL.COM]
> Sent: Friday, November 01, 2002 10:10 AM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      [PIC]: Getting signal safely from fuel injector
>
> EDIT: Sorry people, forgot to add the PIC prefix in the subject line
>
> Hello everyone,
> Now that i have decided on a PIC for my dashboard/logger circuit, i would
> like to ask if anyone out there has a circuit which can interface a fuel
> injector pulse signal to a PIC input?
>
> I have found the circuit to interface it to the points, or coil output of
> the
> car, but nothing so far for the injectors.
>
> Can the same circuit for the points be used for the injectors? I have seen
> one example on diy-efi using optocouplers, there has to be another way
> though.
>
> Te circuit would connect the injector pulses to a PWM Capture pin on the
> 877
> to measure time high and low and show the pulse width in milliseconds, and
> also show duty cycle.
>
>
> Daren
>
The points interface should be very suitable.  Simmilar magnitudes of
voltage are found in injector drivers as ignition coil primaries.

Sounds like an interesting project, I was considering something simmilar to
measure fuel economy, integrating the injector open time to get amount of
fuel used and using the speed sensor to get distance covered.  Not sure how
accurate this would be though.

Regards

Mike

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