Hi Guys,
I want to make a small board-computer for an old car (1965 model) i
own and i have a short question. I want to use a wire connected to the
distributor/ignition to get pulses to a pic and count the rpms.
Since this car has a 4 cylinders 4 strokes motor i will have to divide
that number by 2 and get the real rpm.
The question i have though is the folowing : What precautions i will
have to take in order to have an usable product which does not crash
when the voltage varies a lot ? I mean should i use a special 12v to
5v converter instead of 7805 ?
Also i think about using the schematics for a simple zener regulator
to get the signals from the ignition to the controller :
http://www.asm.ro/schema.gif
I was thinking that this way i can be sure i get a 5v max and i can
safely use a microcontroller digital pin for this. Do you think there
is a much better solution to this ?

Thank you very much for your time

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