Hi people,

thank you again for the answers.

Melanie, thanks for your advice about using another PIC. Actually I have some 12F available here and I´ll try to do what you suggested.
well... I really would like to have a sport car, but I have a small Opel Corsa.... (150 Km/h max speed). Here in Brazil the max Speed allowed in the highways (some of them) are 120 Km/h and the fines related to speeding are rally expensive (US$200,00) !

Mike, my car´s hall sensor will give me 8 pulses for each turn and my wheel is 14" . If my math is right it will give me almost 300 pulses/s at maximum.


Regards

Sérgio Pinheiro