dispositivo sensor sem fio, sistema de iluminação e método de operação de um dispositivo sensor sem fio

The invention relates to a wireless sensor device configured for sensing motion of an object in an area. The device comprises a motion sensor configured for generating a sensing signal when sensing motion in the area and a signal processor configured for processing the sensing signal. A power supply is provided for providing power to the motion sensor. Furthermore, the wireless sensor device comprises a controller configured for distinguishing, from the sensing signal, large object movements and small object movements of the object in the area. The wireless sensor device is configured to perform one or more power consumption reduction operations upon detection of large object movement. The power consumption reduction operations include temporarily disconnecting the motion sensor from the power supply and decreasing a duty cycle of the signal processor.