A hybrid control system, including: at least one ad hoc wireless peer-to-peer network of sensor nodes within a building, each of the sensor nodes including: (a) at least one sensing component configured to generate an output indicative of human presence or absence in a corresponding sensing region; (b) a wireless receiver to receive from one or more others of the sensor nodes wireless signals representing occupancy data indicative of real-time occupancies of respective locations within the building and respective distances to said locations; and (c) a wireless transmitter to transmit to one or more others of the sensor nodes wireless signals representing occupancy data indicative of real-time occupancies of respective locations within the building and respective distances to said locations; and an interface node, including: (i) a first communications interface to communicate with at least one node of the ad hoc wireless peer-to-peer network of sensor nodes, the first communications interface including a wireless receiver to receive wireless signals representing occupancy data indicative of real-time occupancies of respective locations within the building and respective distances to said locations; (ii) a second and addressable communications interface to communicate with a common or centrally controlled system configured to control the operation of a plurality of addressable devices and/or systems distributed within a building; and (iii) a controller configured to send to the common or centrally controlled system, via the second and addressable communications interface, data corresponding to the occupancy data received at the first communications interface to enable the common or centrally controlled system to control the operation of the addressable devices and/or systems distributed within the building on the basis of the real-time occupancies of respective locations within the building and respective distances to said locations. at least one ad hoc wireless peer-to-peer network of sensor nodes within a building, each of the sensor nodes including: (a) at least one sensing component configured to generate an output indicative of human presence or absence in a corresponding sensing region; (b) a wireless receiver to receive from one or more others of the sensor nodes wireless signals representing occupancy data indicative of real-time occupancies of respective locations within the building and respective distances to said locations; and (c) a wireless transmitter to transmit to one or more others of the sensor nodes wireless signals representing occupancy data indicative of real-time occupancies of respective locations within the building and respective distances to said locations; and (a) at least one sensing component configured to generate an output indicative of human presence or absence in a corresponding sensing region; (b) a wireless receiver to receive from one or more others of the sensor nodes wireless signals representing occupancy data indicative of real-time occupancies of respective locations within the building and respective distances to said locations; and (c) a wireless transmitter to transmit to one or more others of the sensor nodes wireless signals representing occupancy data indicative of real-time occupancies of respective locations within the building and respective distances to said locations; an interface node, including: (i) a first communications interface to communicate with at least one node of the ad hoc wireless peer-to-peer network of sensor nodes, the first communications interface including a wireless receiver to receive wireless signals representing occupancy data indicative of real-time occupancies of respective locations within the building and respective distances to said locations; (ii) a second and addressable communications interface to communicate with a common or centrally controlled system configured to control the operation of a plurality of addressable devices and/or systems distributed within a building; and (iii) a controller configured to send to the common or centrally controlled system, via the second and addressable communications interface, data corresponding to the occupancy data received at the first communications interface to enable the common or centrally controlled system to control the operation of the addressable devices and/or systems distributed within the building on the basis of the real-time occupancies of respective locations within the building and respective distances to said locations. (i) a first communications interface to communicate with at least one node of the ad hoc wireless peer-to-peer network of sensor nodes, the first communications interface including a wireless receiver to receive wireless signals representing occupancy data indicative of real-time occupancies of respective locations within the building and respective distances to said locations; (ii) a second and addressable communications interface to communicate with a common or centrally controlled system configured to control the operation of a plurality of addressable devices and/or systems distributed within a building; and (iii) a controller configured to send to the common or centrally controlled system, via the second and addressable communications interface, data corresponding to the occupancy data received at the first communications interface to enable the common or centrally controlled system to control the operation of the addressable devices and/or systems distributed within the building on the basis of the real-time occupancies of respective locations within the building and respective distances to said locations.