> 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?

        Most cars have a "tach" signal that has a rising edge for every spark
ignition, it is usually 12Vp. TTYL

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body