通过手镯,real-time data such as exercise, diet and sleep in the user's daily life can be recorded, and these data can also be synchronized. to mobile phones or computer devices, and then analyze the data to guide users on how to live a healthy life. So what is the working principle of the distance bracelet?

Before that, let’s understand the structure of the distance bracelet. The distance bracelet includes (main control chip and auxiliary MCU (some need: LED light, LCD display control) three-axis acceleration sensor (motion sensor) vibrator (vibration motor) Bluetooth power management chip battery LED array light (LCD screen) NF label tape button. There will be a metal sensor where the bracelet is in contact with the skin, sticking to the skin, and measuring the exercise in daily life according to the amplitude and frequency of wrist movements , sleep and diet and other real-time data.

The distance bracelet has a built-in low-power Bluetooth 4.0 module, which can be connected with mobile phones, tablets, and PC clients, and can set height, weight, stride and other information and upload exercise data anytime and anywhere. There is a built-in lithium polymer battery inside the distance bracelet, which can last up to 10 days and has a strong battery life.

The distance bracelet uses its internal sensor chip to collect information on human physiological functions. It is mainly used for health monitoring, including sports step counting, sleep monitoring, heart rate detection, fall judgment, sedentary reminders and other information. GPS transmits data and synchronizes the data to terminal devices such as mobile phones, and uses the data to guide healthy living. The working principle in different states is as follows:

1. The principle of distance bracelet step counting

智能bracel的运动监测功能et is realized through the gravity acceleration sensor. The gravity sensor is a very mature technology, and mobile phones have long been used. For example, the screen flip function of smart phones is realized through sensors. The sensor obtains some basic data by judging the movement of the person, combined with the basic information of the personal physical signs input by the user before, and according to some specific algorithms, obtains personalized monitoring data for the individual, such as the number of exercise steps, distance and calories burned, etc. , so as to judge the frequency and intensity of the movement. Because each person's exercise has different effects with different personal physical signs, users need to enter their gender, age, height, weight and other information in the APP before using the bracelet for monitoring, and the information will be automatically synchronized to the bracelet. The sensor monitors the movement, and finally realizes the function of movement monitoring through a specific algorithm.

2. How does the smart bracelet monitor sleep

Sleep monitoring is also enabled through the same sensor technology. Human sleep can be divided into five stages according to brain wave signals: falling asleep, light sleep, deep sleep, deep sleep, and rapid eye movement (REM). People's brain waves can change rapidly at different stages. What's interesting is that the gravitational acceleration sensor does not have the function of directly detecting brain waves, so it uses the amplitude and frequency of people's movements during sleep as a measure of sleep. In which stage of sleep, the smart alarm clock function of the bracelet will wake the user up during the rapid eye movement period. If awakened at this time, the sleeper will feel refreshed and have a good sleep effect."

3. The principle of smart bracelet heart rate monitoring

Using a reflective photoelectric sensor, by passing the incident light through the skin into the deep tissue, except for being absorbed by the skin, muscle, blood, etc., the remaining part of the light transmission is sensed by the photosensitive receiver, and by measuring the blood volume in the blood vessel as the heart pumps Changes in blood and periodic changes in blood volume form the basis of all heart rate estimation using PPG signals, and heart rate estimation is realized by calculating the distance between feature points (such as peak values) in adjacent cycles.

The above is the working principle of the smart bracelet in different states. The smart bracelet is a wearable product, and its powerful functions are quietly infiltrating and changing people's lives.