The Design Of Intelligent Mattress System Based On Ceramic Piezoelectric Sensor

At present,smart wearable devices for the elderly or children’s physiology and health examinations are developing rapidly.In view of the design defects in current sleep detection system and the low accuracy in breathing detect during sleep,we design a sleep detection system based on ceramic piezoelectric sensors and propose a sleep detection algorithm to count the breathing and turning over.Our system allocates the piezoelectric sensors under the latex mattress and collects the piezoelectric signal during sleep,then using our algorithm for detecting the breathing and the compensation algorithm for turning over,the respiration rate and turn-over frequency.The experimental results show that the accuracy of the system is up to 96%for breath identification and up to 95.5%for stand-up detection,and the system has better detection comfort.At the same time,by using the Bluetooth module in the mattress hardware design,a scene positioning system with multi-signal transmission points was designed to establish a indoor positioning monitoring system and put forward a centralized algorithm for regional positioning based on signal intensity.To address low precision and poor stability problems of traditional multipoint positioning methods using RSSI(Received Signal Strength Indication),this thesis proposes a localization algorithm utilizing Bluetooth RSSI.This algorithm establishes a regional discriminant model to construct RSSI vector group for different regions.With Bayesian estimation analysis,the RSSI intensity ranging is weighted to get the exact region,and the RSSI vector in this region is selected for RSSI Multilateration.This algorithm can reduce the positioning error and improve the accuracy of regional positioning.Experimental results show that under the condition of linear fitting with 95%confidence,the accuracy of the location can reach to 90.63%and the average positioning error is low to 0.897m.In this thesis,the intelligent monitoring of mattress system design and construction of the corresponding regional positioning scene,innovative realization of intelligent mattress system monitoring and positioning function linkage,for the smart medical and intelligent retirement provides a new way of thinking.