An Oximeter Based On ZigBee

This article mainly talk about the Oxygen in the blood.The normal saturation of oxygen in the blood is about 90%.If the oxygen saturation of body was too low,it would cause the insufficient of oxygen in body,and if the blood oxygen saturation was exorbitant,it would accelerate the body’s metabolism,accelerate cell aging.So,it has an important significance to monitoring the oxygen of blood for the health care of body.Now,we always measure the oxygen in the blood by wired way or wireless way by bluetooth.However when measure the oxygen by wired way,then the nurse has to take these parameters face to face to the patient,then they take a risk get affected.For bluetooth way of the wireless link,although the effective isolation of medical staff and patients,however,because of the bluetooth protocol point-to-point transmission transmission mechanism,lead to blood oxygen acquisition instrument based on bluetooth wireless links in the case of large areas of data acquisition,is time-consuming.Aiming at the shortcomings of the traditional blood oxygen acquisition instrument,this paper is devoted to the ZigBee technology was applied to medical equipment industry,is different from the ZigBee technology to bluetooth and Wi Fi technology,its strong local area wireless network management ability to make it stand out in the numerous wireless technologies,become more nodes,low speed,low power applications technology of choice.Blood oxygen proposed in this paper it is through ZigBee technology realization of blood oxygen information acquisition technology of large collection,summary,greatly reducing the nurses in the hospital patients blood oxygen information collected workload,improve their work efficiency.This system is composed of soft and hard two parts,hardware parts can be divided into analog front end,data processing,wireless communications,cable communication part and back part.Analog acquisition front-end TI analog front-end AFE4490 chip as the core,carry refers to the clip-on oxygen acquisition sensors,and through the SPI bus communication with the back-end.Data processing part is ST company STM32F103C8T6 processor system,the system through the analog front end for processing the data collected,converted to content of blood oxygen saturation value,in part through a serial port sent to the wireless communication.Wireless communication part with CC2530 of TI company as the core.In the wireless communicationsystem,by the coordinator will more terminal node data set,and then unified through the RS485 bus transmission to the background.Software part,ZigBee protocol Stack by TI company of free,open source protocol Stack Z-Stack,application writing,through the IAR integrated development tools.Data processing part in order to improve the real-time and stability of the system,by transplantation of free,open source on STM32F103C8T6 chip u COS II to manage the system task,application development through Keil Vesion5 software to complete.In order to improve the system of generality,the coordinator to background communication adopts the Mod Bus protocol to communicate.Background shows part of the application software by modbus poll to replace.This article details the ZigBee protocol stack frame structure,compared the ZigBee technology are the advantages and disadvantages of the other popular wireless technology.At the same time,in this paper,the system key sensor AFE4490 made elaborate.The article expounds the whole systemThe working principle of the system processing for the system to collect data through a certain algorithm,and analyze the structure.Finally,the article describes the application prospect of this system.If we can apply this system and the actual hospital ward blood oxygen acquisition process,will greatly reduce the workload of doctors and nurses,and reduce the medical staff on some diseases twice the risk of infection.This system can ensure the real-time and veracity of data,system error is small.