Study On Embedded Sleep Monitor And Alarm System

Large amount of medical statistical data showed that the highest incidenceof diseases occurs during nighttime. The incident of acute myocardial infarctionat night is accounted for about half of the overall incidence of all day. Suddendeath rate of patients with cerebral thrombus in sleep reaches as high as70%~80%. In addition, many diseases get aggravated more likely at night, includingcardiac dysfunction, bronchitis, asthma and so forth. The emphasis of the studyin this paper is the implementation of real-time monitoring of sleeping patientsand taking reasonable measures when accident happened, which helps medicalpersonnel provide convenient and timely treatment, reduce the danger of suddendiseases happened at night. The embedded system is widely used in the medicaldevice field because of its low power consumption, high efficiency, highreliability, high cost performance, good real-time, multi-task supporting and littlespace occupying.The system can collect, condition, store and analyze the physiology signalfrom users in sleep, to provide timely and effective warning alert measures whendetecting abnormal physiology signals and to win valuable time for patients’medical treatment. The subject mainly focus on the sudden night diseases aidingsituations, the content of the research consists of:(1) Hardware design.The system can be divided into Acquisition/Processingand Monitor/Alarm two modules. Function of Acquisition/Processing module isto collect, to condition, to store and to analyze the physiology signal (pulsesignal and body temperature) from users in sleep. This module consists ofmicrocontroller (LPC2103), signal adjust circuit，wireless transmitting circuit,memory circuit and operating circuit(supply circuit and reset circuit). Function ofMonitor/Alarm module is to realize telephone alarm, SMS notification, openingdoors automatically, signal receiving and PC set communication. This moduleconsists of microcontroller (P89LPC935), GSM module TC35i, gate controlswitch circuit, wireless transmitting circuit and serial port to USB module. (2) Software design.Based on the internal structure of μC/OS-II embeddedreal-time multitasking operating system, it is elaborated that the requiredprerequisite and steps to transplant μC/OS-II to LPC2103processor.(3) Analysis and arithmetic.Threshold de-noising method is chosen forpulse signal in wavelet de-noising on the theoretical basis of the further study onwavelet transform, multiresolution analysis, mallat algorithm and waveletfunction. Extract and analyze the pulse signal eigenvalue from time domain,frequency domain, time-frequency domain and pulse wave eigenvalue K fouraspects, and presumptively diagnose diseases from the parameter range.The experiment results show that, the system can realize monitor andalarm function based on pulse signal and body temperature from acquisition andprocessing without disturbing users’ morpheus.