verified that the PIR sensor detects residents within the sensing area only. In addition, in order to judge whether the signal is ‘ON’ or ‘OFF’, it is necessary to choose a threshold for the RE431B sensor that considers external environmental disturbance. Initially, several experiments were performed to determine the threshold with respect to the internal temperature change caused by a air conditioner or heater and other disturbances, such as wind or sunshine. Based on these experimental results, when the threshold of the RE431B sensor was ±0.4 V, external environmental temperature change did not affect its performance at detecting the resident. In addition, we verified that pets did not affect the sensing performance with the same threshold.Р РFig. 7. Experimental test bed for the PILAS.
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