Patent ID: 8284021

Claim:
A wireless transmitter for sending a radio frequency signal to a wireless receiver to actuate an electric motor to open or close a movable barrier, comprising: a circuit; a microprocessor coupled to the circuit; at least one switch configured to be actuated to effect transmitting the radio frequency signal; at least one light emitting diode coupled to the circuit; an antenna; the microprocessor configured to use a changing value that varies with actuation of the transmitter; the microprocessor configured to output a command in response to the changing value and a fixed value such that the command varies with actuations of the transmitter; and the antenna configured to transmit the radio frequency signal that comprises the command wherein the radio frequency signal comprises any of three different values, wherein each of the different values comprises a series of four portions, each of the four portions having a length of about 0.5 milliseconds, wherein a first portion comprises a low amplitude radio frequency signal, a second portion comprises one of a low amplitude radio frequency signal and a high amplitude radio frequency signal, a third portion comprises one of a low amplitude radio frequency signal and a high amplitude radio frequency signal, and a fourth portion comprises a high amplitude radio frequency signal.