The home automation system comprises a central (76) regulated by battery and the illumination current circuit (74) forming digital and bidirectional data transmission path according to the normalized signals and synchronized constant frequency. The control unit (76) receives orders sensors and its own microprocessors and emits direction control signals for the execution means (84). Modems (12) of the central (76), sensors (88) and execution means (84) adjust the transmit power inversely proportional to the impedance for the crossover frequency of the connected circuit. A home automation system of the switching device consists of a multifunctional combination switch (16) connected by a modem (12) and a digital connection element to the illumination current circuit (74) and comprising a passive infrared sensor (14) for controlling lighting, temperature and safety. The passive infrared sensor (74) can be developed in the central (76)
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