ABSTRACT
With the rapid development of science and technology, the quality of people's life has been greatly improved, and people are paying more attention to their health conditions. Therefore, it is necessary to design an intelligent bracelet system based on STM32, which can display data such as step number, heart rate, temperature, blood oxygen, etc., so that people can understand the health condition faster and better in real time.
The design is mainly composed of STM32 microcontroller circuit, ADXL345 acceleration sensor, heart rate blood oxygen detection circuit, OLED liquid crystal display circuit, power circuit, clock DS1302 and DS18B20 temperature sensor. Through ADXL345 measurement of gravity acceleration, is used to judge the state of the human body, according to the state of the numerical change of the step function. After heart rate and blood oxygen sensor test, finger pulsation amplification is processed by comparator and sent to single chip microcomputer for heart rate and blood oxygen collection. The number of steps, heart rate, blood oxygen, temperature and time are displayed on the LCD LCD1602, and we can also display the current data to the mobile phone through Bluetooth, which is convenient for the sparring staff to observe the status of the athletes at any time. This design system price cost is low, the function is more comprehensive, has a good market prospect.
This paper mainly introduces the principle, overall design scheme, hardware selection and software design of intelligent health monitoring bracelet. The results show that the smart health monitoring bracelet designed in this paper has the characteristics of low cost, simple operation and good stability.
KEY WORDS: STM32; Health monitoring bracelet; DS18B20 temperature sensor; A pedometer; Liquid crystal display