You may find the info on this page useful:
http://www.xenatera.com/bunnie/proj/tach/tach.html

Wesley

On Fri, Nov 22, 2002 at 04:47:41AM +0800, Pang wrote:
> Hi all,
>
> Does anyone has any experience tapping signals from the tachometer? Is there
> any other method of knowing a car revolution per minute (rpm)?
>
> I was thinking of designing some simple module with a uC that interprets an
> automobile rpm and do certain things accordingly, for example, locking of
> door and sounding the buzzer when the hand brake is not released, etc.
>
> I don't have a car of my own, as such, can anyone describe the expected
> waveforms roughly? Can we actually tap the signal and feed it to a ADC  or a
> Timer input Capture, simply?
>
> Thanks.
>
> Best regards,
> pang

--
Wesley Moore      http://yallara.cs.rmit.edu.au/~wmoore/
RMIT - BEng (Comp Sys Eng)/BApp.Sc. (Comp Sci)  4th Year

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