For smart bracelets, there are built-in acceleration sensors and low-power Bluetooth modules. The acceleration sensor can record the user's motion state. We can get our motion data and energy consumption through software algorithm according to the height and weight provided by the user, and then connect with the mobile phone through Bluetooth, collect the data into the matching mobile APP, and present the results to the user.
The health APP is actually the same, except that the acceleration sensor for collecting data is built into the mobile phone. The M7 coprocessor in iPhone 5s, the Sense Hub coprocessor in Samsung GALAXY S4 and Meizu MX3 can collect sports record data for us. With the permission of the user, the sports APP can directly retrieve data for analysis and present it to the user, so it can achieve the same effect as the smart bracelet recording data.
About monitoring sleep, many friends may find it mysterious and high-end. In fact, this function is also recorded by sensor induction. When we sleep, we are usually at rest, but when we turn over and move, the sensor can record these changes, and then we can use software algorithms to calculate our total sleep duration and sleep quality. Of course, this record is not very accurate. You know, to really do a sleep monitoring, you need to put all kinds of sophisticated monitoring equipment on your body and stay in the hospital for a few nights to know how your sleep quality is, so we should not take the results of smart bracelets and mobile apps too seriously.