Design And Implementation Of Wearable Blood Pressure Monitoring System

Faced with the increasing pressure of modern life and the aggravation of aging society,the number of sub-healthy people is increasing.Cardiovascular diseases,especially high blood pressure,are gradually devouring people’s bodies.High blood pressure is more likely to cause related major diseases,and heart rate is also an important factor affecting blood pressure data,as it takes precious time and money to go to a nearby pharmacy or hospital,people need to understand their body data more easily.With the introduction of low-power Bluetooth technology,it provides a technical foundation for the development of wearable devices.At present,the portable wristband measuring blood pressure equipment on the market is relatively cheap,but the size is not conducive to carrying and the function is single,and the price of the smart bracelet that can measure blood pressure is nearly 1,000 yuan,and the cost is relatively high.The blood pressure measurement bracelet involved in the thesis field needs to send the collected pulse wave signal to the server for calculation,and it cannot be measured without the network.Therefore,this article designed a wearable bracelet in response to the above problems.In addition to local calculation and display of blood pressure data,heart rate is used as a reference factor for blood pressure changes.By collecting human blood pressure,heart rate,temperature and other data and performing digital display,multi-dimensionality is high Blood pressure patients provide a reference,and the price advantage is obvious compared with the smart bracelet for blood pressure measurement on the market.The main work of this paper is reflected in the following aspects:(1)Hardware design.In this paper,the method of measuring blood pressure at home and abroad and the Bluetooth communication technology protocol are studied,the photoplethysmographic technology is used for blood pressure measurement,the relevant hardware is selected and the schematic diagram is designed.In order for the system to run stably and orderly,this article conducts circuit design research on each sensor submodule,and rationally designs the surrounding circuit layout of the main control chip to reduce the noise generated during system operation and enable it to operate normally.(2)The realization of module drive.Through the research and study of the chip in each module,the driver program of the corresponding module is developed,and it can complete the established functions,including blood pressure data collection,heart rate data collection,body temperature data collection,display data display,and measurement remaining battery.(3)The realization of Bluetooth communication.The data collected by the wearable device through the sensor needs to determine the source of the command and return the data.When the command sent comes from Bluetooth,it returns to the smartphone.Through the created Bluetooth communication service,specific test content is carried out according to the private command protocol.Finally,through the test of the system,the results show that the measurement data of the wearable device is accurate and meets the requirements.