Now people are also more and more concerned about their own health, then smart wearable devices are springing up more and more. What smart watches, smart bracelets abound. Then these devices in addition to some of the information pushed on the phone, the main function is health detection. Like what heart rate, blood oxygen saturation, electrocardiogram and other physiological hard indicators. Or some exercise how many calories detection function. Then how do they realize it on such a small screen device?
First of all, let's talk about heart rate detection
We've basically noticed that when a device detects a heartbeat, most of the time, a green light appears at the bottom of the device. Yes, it's this vital green light that is the key factor in detecting what's going on with your body. There's a song that goes, "You're a light, so wonderful."
In fact, the principle of emitting light to detect the heartbeat is a kind of optical way to measure the pulse, the full name is "PGG photoelectric volumetric pulse wave tracing method". To put it bluntly, it is like radar, the equipment has two sets of devices to transmit and receive, emit light, encounter the human body, reflect the light back, the receiver receives the reflected light, analyze the results.
To complicate matters, when a beam of light of a certain wavelength hits the surface of the skin, the skin, muscles and blood absorb some of the light, and the red blood prefers to reflect some of it. And because the blood and speed in the blood vessels differ when the heart is in contraction and diastole, they will reflect light in different colors. The sensor receives this series of different colors of reflected light data and then applies a certain algorithm to convert the heart rate.
This is a "light-electric-digital signal" process.
Smart bracelet ECG monitoring useful? Should be a smart bracelet to measure the heart rate of it, there is no use mainly depends on what you are doing. If only reference used to guide their own exercise, I personally feel that it is still more useful. The heart rate of the reference when exercising, will be able to control the basic aerobic and anaerobic exercise.
The smart bracelet measures heart rate through photoelectric sensors, detects the surface skin blood flow algorithm, calculates the heart rate, theoretically accurate, the actual application, often due to wear details caused by small errors, the error range is acceptable. The effect of the movement will also become more and more obvious, especially when used for fat loss exercise is very useful, so that they are in an effective heart rate to achieve the right effect of exercise.
Smart bracelet to measure heart rate, is to rely on a light that emits green light, shot to your skin, and then the sensor to absorb the light radiating back, through different radiation rate, to determine your subcutaneous blood flow. Therefore, if the fit is not tight, it is easy to have errors ~ There are also various sensors, and software algorithms for data are not the same, more or less there will be a little difference, but not outrageous, the daily look is still possible.
There is another way to test the ECG signal, the sensor of the bracelet can measure the electrical signal of the contraction of the heart muscle to judge the user's heart rate, the principle is similar to the principle of ECG. The disadvantage is that the circuit is more complex, occupies more PCB space, is susceptible to electromagnetic interference, while the sensor must be close to the skin, placed in a relatively fixed position, so it is difficult to have a bracelet to use this measurement method.
On top of that, there's vibration measurement, which has only recently come out. Because every heartbeat will cause the body to vibrate, through high-precision sensors to capture this vibration, and then after signal processing can get the heartbeat, in general, smart cushion or smart massager products will be used in this measurement method, the bracelet is relatively rare.
What is the use of smart bracelet
Entry-level functions of smart bracelet
1, recorded sports data
FashionComm Lekang sports bracelet that, for fitness enthusiasts, the more detailed the sports data recorded by the smart bracelet the more excellent. But in fact, many sports bracelets can only roughly record steps, distance and calories, and cannot distinguish between different types of sports. Some sports tracking bracelets can automatically monitor different types of exercise such as walking, cycling, storming, etc., but the monitoring effect may also be poor.
In order to enhance the stickiness of the bracelet's use, sports detection bracelet brand owners also fancy elsewhere. The common practice is to convert sports scores into points and active points that can be used for consumption. Some Bluetooth sports bracelets can also be used in the exchange of workout data into props in the game of Daily Cool Running . and gold coins, etc., which is quite attractive for Cool Running fans.
2, record sleep data
FashionComm Lekang sleep bracelet that sleep monitoring bracelet in the sleep data record, should include deep sleep, light sleep, interruptions, and other different sleep modes, but the vast majority of the bracelet can only record sleep data, but most of them do not have a targeted sleep monitoring analysis.
3, silent alarm clock
Early bracelets with alarm clock, many do not have such a function, but most of the current smart bracelets have been standardized with this feature. Smart bracelet brands have designed vibrating alarm clocks, usually because users need an alarm clock that quietly wakes them up, and don't want their cell phone alarms to be too noisy to affect others; in addition to the fact that users want to go into a light sleep, so that they can sleep more efficiently, without affecting their daily work and life.
Advanced features of smart bracelets
1, exercise guidance
Exercise guidance is also the gradual evolution of sports fitness bracelet features, equivalent to a simple fitness coach. It allows users to choose a variety of preset workout programs and steps, and the smart bracelet will gradually guide users.
2, heart rate monitoring
With the increasingly demanding requirements for fitness bracelets, users are no longer satisfied with the simple record of steps and calorie consumption, the addition of heart rate monitoring allows users to achieve a more healthy fitness purposes. There are already more and more heart rate monitoring bracelets that focus on sports and exercise functions, and it is foreseeable that the heart rate monitoring function is likely to gradually become the standard of sports bracelets.
3, social reminder
Some social smart bracelets can display notifications of phone calls, text messages, WeChat, emails, and other notifications after connecting to a smartphone, so users no longer need to frequently press the bright screen of the phone to avoid missing information. Take a look at the smart bracelet can be fixed, can not only look less abrupt, but also can save power to improve the life of the phone. MicrosoftBand, for example, is basically able to display notifications from cell phones, and the well-known smart wearables brand vendor Leyuan Digital FashionComm better smart bracelet L11 will also add the appropriate social reminder function.
4, social
Smart bracelet socialization ideas there are 2 kinds, a social way is to add each other's friends, this function if you can cross the brand barrier, it will be a very interesting thing. The other setup of the social bracelet is the sports competition, which can be PK between users of smart bracelet brands. and WeChat may also become a reality after supporting smart hardware access, cross-brand PK.
5, answer the phone
An answer phone is the standard of the smart watch, do not need to take out the phone from the pocket to answer the phone, in the extremely crowded place can come in handy. At the moment, it's rare to find a smartband with the ability to answer calls.
6. Remote control
Remote control is the function of remote control that can be realized through smart bracelet with the support of software. Due to the multi-brand collaboration, this function has not yet appeared on the smart bracelet in general.
7, time display
The biggest difference between a smartwatch and a smart bracelet is that a watch is naturally supposed to display the time, while a smart bracelet is not. In order to pull in smartwatch users who value the time function, some smart bracelets are now able to display the date and time as well.