i have a project where i need to measure the speed of cars, on a one wide road, one lane wide.For this i want to use this cable ( Piezo Coax Cable ) , having two lines of this sensors separated a know distance and save the time when the car pass over each sensor would give me what i need to calculate the speed.
My question is : How do i interface this cable with arduino ? Maybe i need an amp or some kind of circuit to make it work like a switch? I have a Mega 2560 and i'm thinking using interrupts to detect when the car has passed over the sensor and record the time in millis.
is this viable ?
any suggestion would be appreciated
PD: Cable generates around 15 - 30 volts when pressed by foot