Patent ID: 8233625

Claim:
A wireless transmitter for sending an output signal to control an actuator to open or close a garage door, comprising: a circuit board; a microprocessor on the circuit board; at least one button that, when actuated by an end user, initiates sending the output signal; at least one light emitting diode responsive to at least one of the at least one switch; an antenna; the microprocessor configured to use a changing value that varies with actuation of the transmitter; the microprocessor configured to output a secure signal in response to the changing value and a fixed value such that the secure signal varies with actuations of the transmitter; and the antenna configured to transmit modulated radio frequency signals in response to the secured signal wherein the modulated radio frequency signals comprise any of three different signals, wherein a first of the different signals comprises a low amplitude radio frequency signal having a length of about 0.5 milliseconds followed by a high amplitude radio frequency signal having a length of about 1.5 milliseconds, wherein a second of the different signals is represented by a low amplitude radio frequency signal having a length of about 1.0 milliseconds followed by a high amplitude radio frequency signal having a length of about 1.0 milliseconds, wherein a third of the different signals is represented by a low amplitude radio frequency signal having a length of about 1.5 milliseconds followed by a high amplitude radio frequency signal having a length of about 0.5 milliseconds.