Design Of A Remote Nursing Monitoring System For Home Care Based On The Embedded Linux

China is now entering into the aging society. The contradiction between the increasing demand on nursing and medical resources for the elders and the insufficient supply of them is becoming aculeate increasingly. This paper from the perspectives of economic and sustainable development, based on the embedded electronic technology, network communication and sensor information fusion technology, designed a kind of Home-Internet-Hospital telemedicine system for home care. It transplanted the traditional hospital care into the family by making the full use of the internet, and extended the function of hospital care. It can help us take care of the elder more efficient, especially in the aging society.The paper describes the construction of hardware and the design of software of the system in detail. The hardware is based on S3C2440with peripheral sensor modules such as DHT91temperature sensor module, USB camera module, and voice input and output module. The software is based on linux2.6.32and MFC platform. The whole system is mainly divided3software-hardware modules:temperature and humidity module, video capture module, and audio capture module.Temperature and humidity module:Firstly, the DHT91sensor's driver was designed. Then the application program used for receiving the temperature data and transmitting them into internet was coded. Finally, temperature and humidity information dynamic display was realized. Sensor's driver was packed as the char driver, and because kernel havn't configured supporting of floating point arithmetic, data compensation has been done in the user-level. In the monitoring center, CDC::Polyline() function was called to real time draw the data information. Transmission Control Protocol/Internet Protocol was used to transmit the data.Video capture module:Firstly, USB driver transplanting program and the video capture application program were completed to realize the video information capture, transition, and display in real time which are based on the V4L2technology. T.264was chosen to compress the video data, however it only support the YUV4:2:0data format. So before the data encode, the system must change JPEG pictures output by the USB camera into YUV4:2:0data format.1) Decode the JPEG pictures to the RGB raw data through JPEGLIB.2) By a specific formula, transmit RGB to YUV420.3) Send the data to T.264to be encoded. At the monitoring center, it has the reverse procedures. It decodes firstly and then uses the IStream and oleLoadPicture () to load the picture and display video data through the Render () function which is the class member of IPicture.Audio capture module:It mainly realized the Voice Interactive function. Firstly, sound card driver transplanting was done. Then the recording and playback application program through the file interface, which was provided by the sound card driver, was designed. Finally, the low level audio interfaces were used to fully control the audio equipment and eventually achieve the relative audio programs of the WINDOWS.System has the advantages as follows:strongly transportability, friendly control interface, designing of hommization. Besides it has the richly client software resources, such as data saving, video recording, screenshot, audio recording and Automatic Threshold Alarms and so on, which can help us find a more efficient solution to the home care for the elder.