The System Design Of A Wearable Electronic Thermomter Based On BLE

With the development of wireless communication technology and electronic equipment interconnection equipment miniaturization technology,and with the increasing of disease prevention,rehabilitation and health monitoring for real-time monitoring the temperature of the human body needs,which provide a good platform for the development of wearable medical devices,and increase the market demand highly.At present,wearable electronic body temperature equipment has the phenomenon of low cost,large volume and small volume,and it does not take good account of practicability and experience.In order to solve this problem,a wearable electronic thermometer system is designed and implemented based on Bluetooth low power communication technology,which can give consideration to low cost,low power consumption and small size as far as possible.During the research process of the thermometer system concretely,we describe the whole framework of the system and the device selection,hardware circuit composition and software design process,and put forward and verify the feasibility of subsequent mass production.Using the theory of antenna correlation and combining with HFSS13.0 software,the paper makes modeling and simulation of the printed antenna for Bluetooth and optimization of antenna parameters,so that it can achieve good wireless communication effect in the application situation of the human body.The performance of the optimized antenna is verified by experiments and compared with the design index.By studying the discharge characteristics of button cells and combining the actual needs of wireless communication and temperature collection,the battery management logic is designed and optimized.Through the aging discharge test,the power division scheme is optimized,which makes the battery power management more suitable for the particularity of the wearable equipment,and provides a reference for the management of the same kind of low cost and low power equipment.Finally,through the optimization,test and verification of the power consumption,temperature measurement,wireless communication and other circuits of the wearable electronic thermometer system,the main design indexes of the thermometer system are as follows: the temperature measurement accuracy can reach up to 0.1 degrees centigrade within the range of 32 degrees centigrade to 42 degrees centigrade;the power supply of the button cells are supplied by the button cells after half a year,The endurance time can still be maintained for more than 500 hours.At the same time,the intelligent terminal and thermometer,such as mobile phone and thermometer can realize Bluetooth communication in the range of 10 meters,and collect and record the temperature measurement information in real time.