Patent ID: 7782188

Claim:
A sensor device of a plurality of sensor devices in wireless communication with a controller device, the sensor device comprising: an antennae for transmitting/receiving wireless signals; a sensor device for gathering sensed data; and a control circuit in communication with said antennae and said sensor device, wherein the sensor device performs a method comprising: the sensor device receiving beacon signals from said controller device; the sensor device averaging the strength of previous beacon signals to produce an average threshold value; the sensor device saving the average threshold value as the predetermined threshold value; the sensor device determining that a received first beacon signal is not directed to said sensor, the determination based on strength of a received second beacon signal not exceeding the predetermined threshold value; the sensor device determining that the received second beacon signal is directed to said sensor, the determination based on strength of the received second beacon signal exceeding the predetermined threshold value; and immediately after receiving the second beacon signal, the sensor device transmitting sensor information to said controller, said sensor information comprising said gathered sensed data.