How do you think, why Microchip labeled it chips as PICs?
Maybe because it can _PICk_ signal out of noise.

PIC do have some DSP capabilites. Car's injector works at 1 khz max,
if I'm not mistaken. So with a 10-bit A/D Converter and an 8 x 8 hardware
multiplier (PIC17,PIC18) PIC seems to be a fine tool not only to count
pulses but also to _pick_ varying signal out of noise.
Simple potential divider and capacitor as high-frequency filter and good
overall anti-noise design are enough, I think.

If you got PIC, make it work.   Yeah, You Can Make It If You Try.

If you have no appropriate background, I don't know what to do.

Good luck


> Hi, I've been lurking around this list for a while now and its turned out
to
> be an invaluable source of information. I feel the time has come to ask my
> first question though.
>
> I have no EE background so apologies for any incorrect terminology I may
> use. My project involves using a PIC to read pulses from a high voltage
> source, a car's injector pulse signal. I'm not happy at all with the way
I'm
> currently reducing the pulses to 5V, using a zener diode and a potential
> divider.
>
> I know there must be a much better way to do this and would be eternally
> grateful if someone could offer me a better solution, it would be
fantastic
> if I could come up with something capable of handling a wide range of
> voltages for the pulse. e.g.. 2V to 60V. Keep it simple though or I'll
never
> understand!
>
>
> Many thanks,
> Graham
>

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