Hi,

        Here in my city, for detect car speed, they put 2 sensors on the floor

        ----------------------------
B                                   |
        ----------------------------

        ----------------------------
A                                   |
        ----------------------------

                    ^
                    |
                    | (direction that the car goes)

        This sensor are 2 wire that creates a magnetic field...when the mass of
car cross this
field, a signal is send from A point...
        When the car cross the second field, a second signal is send, now from B
 point...

        This way, with this 2 signals, i can measure the speed....

        Does someone know the can i obtain the hardware for this application? Pl
ease, i need the
solution (the product)!

        Miguel Wisintainer