Design Of Smart Health Watches Based On Ble

More and more enterprises and individuals are joining into the development of smart watches today due to the rapid development of economic and wearable technology and the growing of elderly population.With the fast development of smart watches,there are also some problems such as unknown needs of industry users,inaccurate product positioning,unsmooth object interconnection and so on.At the same time,smart watches exist disadvantages of high power consumption,low accuracy,poor stability,high price and single function.In view of the above shortcomings,this paper designs a smart health watch based on low-power Bluetooth.Smart watches not only have traditional watch functions of date and time,but also can get the user's movement information,heart rate,body temperature and other data to provide support for the user's healthy life.The motion detection module mainly realizes the function of the pedometer.First of all,the acceleration data obtained by LIS3DH is three-axis integrative,and then the data is processed by the two moving average filter to make the data curve smoother.Using time window function and amplitude threshold setting gets the maximum effective value of data.In order to effectively remove shaking arm interference and pseudo peak,the algorithm sets a continuous accumulation of steps in 6 seconds to achieve the purpose of accurate step counter;The heart rate detection module firstly obtains the user's PPG signal through heart rate sensor ePL2197.Data collected will be removed baseline drift problem by Butterworth high pass filter,and then implementing digital filter with the Butterworth low-pass filter removes noise and interference.The heart rate data is obtained by the peak detection algorithm,and finally the accurate heart rate data is obtained by using the PPG signal;The temperature detection module is firstly close to the wrist and then collects wrist temperature through the high-precision temperature sensor MLX90615.Body temperature reference data is based on temperature changes.After physical testing,the accuracy of the smart watch designed can meet the daily needs of users in counting step,heart rate and body temperature data.