Sensor synchronized networks using overlapping sensor fields

A method of synchronizing a sensor network, comprising:

• providing said sensor network including a building automation network coordinator node having a master radio frequency (RF) transceiver system, and a plurality of sensor nodes including a first sensor node having a first passive infrared (PIR) sensor coupled to a first RF transceiver system and a second sensor node including a second PIR sensor coupled to a second RF transceiver system, wherein said first PR sensor and said second PIR sensor have partially overlapping fields of view in a sensed overlap area in a building, wherein movement of at least one individual through said sensed overlap area triggers dynamic synchronizing including:
• said first sensor node waking up and sending a first RF request to join a subnet within said sensor network and for a schedule of wakeup times;
• said first sensor node receiving a response from any of said plurality of sensor nodes that that receives said first RF request, said response including synchronization information comprising future times said first sensor node should wake up for RF communications;
• said second sensor node activating at a first time by said movement and sends a second RF message to join said subnet and for a schedule for wakeup times, and
• said first sensor node receiving said second RF message and in response said first sensor node sends said synchronization information to said second sensor node.

A computer program product, comprising:

• a non-transitory data storage medium that includes program instructions executable by a processor to enable said processor to execute a method of synchronizing a sensor network including a building automation network coordinator node having a master radio frequency (RF) transceiver system and a plurality of sensor nodes including a first sensor node having a first object recognition sensor (ORS) coupled to a first RF transceiver system and a second sensor node including a second ORS coupled to a second RF transceiver system, wherein said first ORS and said second ORS have partially overlapping fields of view in a sensed overlap area in a building, said computer program product including code for triggering dynamic synchronizing responsive to sensed movement of at least one individual through said sensed overlap area including:
• code for said first sensor node waking up and sending a first RF request to join a subnet within said sensor network and for a schedule of wakeup times;
• code for said first sensor node to receive a response from any of said plurality of sensor nodes that that receives said first RF request, said response including synchronization information comprising future times said first sensor node should wake up for RF communications;
• code for activating said second sensor node at a first time by said movement and send a second RF message to join said subnet and for a schedule for wakeup times, and
• code for said first sensor node to receive said second RF message and in response to said second RF message said first sensor node to send said synchronization information to said second sensor node.