You may need a voltage divider for the sensor output as the arduino can only handle a maximum of 5V.When you say "the pulse is very very fast" what is the maximum frequency your talking about?I would probably read the pulses using interrupts and store a running average of the time between them for the main code to pick up and control the LED's with.
well i hooked up an leg to the signal from the car and the ground of the car and it powered it with a resistor, the output is 5v from the car and i dont know what the max frequency is... how do you think i could find that out? and ive been seeing things about useing interrupts but i have no idea how to use them and how i would set up the code...
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