Multi-Parameters Homecare Monitor Based On Android Mobile Terminal

Nowadays, the wearable devices, which are aimed at healthcare for human beings, have become more and more popular in the world wide. As the very widespread personal device, smart phone has its opportunities in computing ability, which has gone far beyond the traditional home-use healthcare device. The purpose of this article is to take good use of its outstanding computing ability to find a way for combination of smart device with physiology parameters healthcare and finally present a low-cost, fast and convenient multi-parameters healthcare system. The release of Android Open Accessory API by Google in 2011 made this possible.A multi-parameters homecare monitor based on android mobile terminal has been proposed in the article, which will be able to measure 3 parameters, including temperature, breathing rate and heart rate. There are two parts in the system, software and hardware. The hardware consists of four parts, smartphone on android 4.1.2 Operation System, FT311D protocol-exchange chip, MLX90615 Infra-Red Thermometer and MS5805-02BA01 Miniature Altimeter Module. On the one hand, the two sensors communicate with FT311D, which should be preset as IIC mode, through IIC Bus. On the other hand, the smartphone connects to FT311D with USB. The software is mostly about the android application, for human-computer interface, data collection and digital signal processing. From the perspective of structure, the software can be also divided into interface-layer and user-layer.The way of breath rate and heart rate measuring is to process Fast Fourier Transform after data collection from pressure-tight ear canal. The collection sampling frequency is 10Hz and the Number of sampling points is 256. Then, analysis the amplitude-frequency characteristic to pick out the meaningful frequency of breath rate and heart rate. The temperature is directly measured by the Infra-Red Thermometer in ear canal as well.At the end of the article, a system testing has been made to confirm the feasibility, scientificity and convenience of the whole system.