Design And Implementation Of Smart Bracelet For The Elderly Based On STM32

With the rapid arrival of the mobile information era,it has promoted the rapid progress and continuous development of modern Internet and other information electronic technologies.Smart phones have gradually gained comprehensive application and popularization,portable wearable mobile devices,smart home and other electronic products are slowly entering people's field of vision and appearing in our daily lives at home.The development process of the population aging in our country has accelerated.Under the fast-paced life and work environment,people are mostly busy with their own work.It is difficult for young people to provide comprehensive life and health care for the elderly.Health issues have always been a hot spot of people's attention.Based on this background,it is meaningful to design and develop a wearable smart device suitable for use by the elderly.Based on the concept of Internet of Things and medical health,this system proposes a hardware and software design scheme for the smart bracelet for the elderly.The smart bracelet can record the user's heart rate and body temperature and other daily physical conditions,as well as information such as exercise status and accidental falls.The smart phone has a built-in Bluetooth module.The smarte phone can establish a connection with this bracelet through Bluetooth.The heart rate,exercise status and body temperature recorded by the bracelet can be synchronously inquired by installing the corresponding application on the mobile phone.Fall detection can be effectively passed through text messages.The way to inform the guardian of the unexpected situation of the wearer of the bracelet in real time,and the bracelet is equipped with GPS positioning,the guardian can locate the position of the wearer of the bracelet more quickly.The overall design of the smart bracelet for the elderly mainly includes the heart rate acquisition module,the exercise status acquisition module,the OLED display module,the Bluetooth communication module and the GPS positioning module.The hardware and software system design are analyzed and designed respectively.The hardware design part mainly includes the design and debugging of each functional module.The STM32 series microcontroller chip based on the Contex-M3 core is used in the system as the main control processor of the smart bracelet.This series of chips is small in size and low in cost.The heart rate sensor chooses a photoelectric reflection type physical sensing element.The circuit in the sensor can amplify weak signals and suppress noise,and then set the threshold comparison through the program algorithm,and output pulses after the above processing.The motion posture sensor is a three-axis acceleration sensor,and the algorithm is designed for step counting and fall detection.The design of the software part includes the software design of each hardware module and the design of the corresponding mobile phone application APP.The smart phone terminal APP is developed based on the Android platform.