1, the function of motion counting is realized by a triaxial acceleration sensor, which refers to the three dimensions of X, Y and Z in space. With these three dimensions, the sensor can capture the acceleration change of the bracelet in use, thus generating corresponding data. However, people are not mechanical in motion, which requires development engineers to rationally optimize and adjust the calculation method of sensors and filter out irregular gestures and actions in daily life as much as possible.
The step counting is not 100% accurate, but it can guarantee the accuracy of 80% and more than 90%.
2. Mobile phone control function. Generally, after the bracelet is paired with the mobile phone Bluetooth, the mobile phone can be unlocked and answered by responding to operations and instructions, and all the existing products on the market can be realized.
3, sleep monitoring function, the contact between the sensor and the wrist, monitoring people's movements, the smart bracelet mainly knows the state of sleep through the frequency of body movements, and the movements mostly indicate that the sleep is shallow, and the body movements of deep sleep users are relatively small; Obviously, it can be seen that the error of monitoring the sleep state through the bracelet is actually very large, and the optimization algorithm is needed to reduce the error.
4. Heart rate monitoring is a new index. Corresponding sensors are added to the bracelet for monitoring. The common detection principle of bracelet is photoelectric transmission measurement. In principle, the sensor that contacts the bracelet with the skin will emit a beam of light to the skin to measure the reflected/transmitted light. Because blood can absorb light with a specific wavelength, every time the heart pumps blood, this wavelength will be absorbed in large quantities, thus determining the heartbeat. But the disadvantage is that it consumes a lot of electricity and is disturbed by ambient light. At present, the function of monitoring heart rate of smart bracelets or watches on the market mostly adopts photoelectric transmission measurement.
Due to the external interference, the data information 100% cannot be guaranteed to be correct.
5, some bracelets are mainly waterproof, high endurance and other selling points.
It's mainly about sports, so we can't help but be waterproof. Whether it is sweat during running or washing your face and hands after exercise, there are certain requirements for the waterproof performance of a product, not to mention that many users choose swimming as their fitness program.
On the one hand, the battery capacity determines the battery life, on the other hand, the circuit design of the bracelet and the reasonable optimization of the function are realized. The fewer functions, the longer the life of the bracelet. At present, the life of bracelets is generally more than 7 days.
To sum up, the functions and technologies of the existing bracelets are relatively mature, and consumers can choose to buy them according to their own conditions.