Patent ID: 7122944

Claim:
A signal generation system, comprising: an enclosure having a door, said door being pivotable between a fully open position and a closed position; at least one piezoelectric device which, upon actuation, generates voltage; and at least one wireless transmitter which generates a wireless signal when said piezoelectric device generates said voltage, said piezoelectric device comprising a spring-loaded pushbutton, a hammer and at least one piezoelectric element, said pushbutton having a first pushbutton position and a second pushbutton position, wherein: upon moving said door to said closed position, said pushbutton is moved from said first pushbutton position to said second pushbutton position, and upon moving said door away from said closed position, said pushbutton is moved from said second pushbutton position to said first pushbutton position, and said hammer is actuated to exert pressure on said piezoelectric element and thereby actuate said piezoelectric element when said pushbutton is moved from at least one of said first pushbutton position and said second pushbutton position to the other of said first pushbutton position and said second pushbotton position.