Patent ID: 6166660
Filing Date: 2000-12-26
Classification: B60Q

Abstract:
A driveway alarm system either for warning an occupant of a premise about an object, including a vehicle, on the driveway, or for warning a driver of a vehicle in the driveway, comprising:a solar panel, responsive to sunlight, for providing a solar panel signal;a battery, responsive to the solar panel signal for providing a battery signal;a driveway probe, responsive to a magnetic field signal, for providing a magnetic field, and further responsive an object on a driveway, for providing a driveway probe signal containing information about a magnetic field that has been disturbed by the object on the driveway;a magnetic field generator, responsive to the battery signal, for providing the magnetic field signal, and further responsive to the driveway probe signal, for providing a magnetic field generator signal indicating that the magnetic field has been disturbed;a radio transmitter, responsive to a magnetic field generator signal, for providing a radio transmitter signal;a receiver, responsive to the radio transmitter signal, for providing a receiver signal;a line carrier current transformer, responsive to the receiver signal, for providing a line carrier current transformer signal; anda line carrier current audio device, responsive to the line carrier current transformer signal, for providing a line carrier current audio device signal for warning an occupant of the premise about the vehicle in the driveway.