Abstract
A human motion detector is needed for the device-fee localization. Infrared light and ultrasonic waves are mainly considered human motion detectors, but they have problems. These devices have a positioning restriction due to their power supplies and the loathsomeness of being monitored. We developed a motion detector that is based on the attenuation of Bluetooth signals within the 2.4 GHz band, by focusing on water. The motion detector solves the key problems because Bluetooth beacons have long life without needing to change their batteries and Bluetooth signals through most obstacles. We applied these motion detectors to a remote elder care support system and experimented with the attenuation of the Bluetooth signals by taking into consideration the human body and concluded that Bluetooth can be used for motion detectors. We also discussed this motion detector in comparison with others.
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