In the Internet age, Wi-Fi is as ubiquitous as oxygen in our lives. It is the most widely used wireless network transmission protocol today, carrying more than half of the global traffic. Wi-Fi is an all-encompassing term used to describe the evolving 802.5438+05438+0 protocol family.
The Wi-Fi Alliance is an organization that promotes the development of Wi-Fi. They simplified the name of Wi-Fi by numerical naming. For example, Wi-Fi6 corresponds to 802. 1 1ax, Wi-Fi5 corresponds to 802. 1 1ac, and Wi-Fi4 corresponds to 802.6438+0648.
The arrival of 5G has opened the era of Internet of Everything, such as autonomous driving, smart city, telemedicine and smart wear. These are the application scenarios of the Internet of Things. In order to better meet the needs of this kind of market, the Wi-Fi Alliance has introduced a Wi-FiHaLow authentication scheme with wider coverage and lower power consumption.
Wi-FiHaLow is an authentication standard based on IEEE802. 1 1ah technology, and it is also a low-power Wi-Fi technology tailored for the Internet of Things market.
As we all know, low-power transmission standards suitable for the Internet of Things include ZigBee, Z-Wave, Bluetooth, Thread and so on. The disadvantages of ZigBee and Z-Wave are low bandwidth and weak setting flexibility. Take ZigBee as an example, it can't perform frequency hopping, and it is easy to be disturbed when the network is deployed. Therefore, ZigBee is not suitable for the Internet of Things or M2M applications with unstable RF environment (terminals based on specific industries). Wi-FiHaLow can connect more than 8000 devices to a single node, and it also has certain anti-interference ability and wall penetration ability.
As for Bluetooth, its disadvantage lies in the communication distance, which generally does not exceed 10 meter. The maximum transmission distance of Wi-FiHaLow is1000 m.
As a long-distance wireless transmission technology, Wi-FiHaLow has the characteristics of low power consumption and long distance, and can be applied to smart wearable devices in addition to industrial Internet of Things, unmanned aerial vehicles, security monitoring and other fields.
At present, mainstream smart wearable devices can be roughly divided into three categories: TWS, smart watches and smart glasses. The first one is TWS. Consumers usually pay more attention to the sound quality, noise reduction and battery life before buying TWS headphones.
For better portability, TWS headphones are basically small, about the size of a thumb. In a limited volume, TWS headphones need to be filled with many components, including audio units, noise reduction chips, batteries and so on.
At present, the vast majority of TWS headphones on the market can basically reach 5~8 hours in a single use. There are two ways for manufacturers to further improve the endurance of TWS headphones: one is to increase the battery capacity; The other is to introduce fast charging technology.
Although it is not difficult to increase the battery capacity, there are many problems in this simple and rude method. For example, with the increase of battery capacity, the volume of the battery will also increase, so that the cavity of the earphone will become larger and heavier, which not only sacrifices some portable properties, but also affects the wearing comfort of the earphone. In addition, adding more functions to TWS will also accelerate battery consumption.
As for the introduction of fast charging technology, it can not fundamentally solve the battery life problem of TWS headphones, because users need to put the headphones in the charging box and wait for 5 minutes before they can continue to use 1 hour. The low power consumption of Wi-FiHaLow helps to improve the endurance of TWS headphones. Although it is not difficult to bring about qualitative improvement, it is at least better than before.
Followed by smart watches. Take AppleWatch as an example. It can run independently of the mobile phone through the e-SIM function, and there is a special application store. Users can download the corresponding app according to their own needs. These operations are inseparable from mobile cellular data and Wi-Fi.
The biggest bottleneck of traditional Wi-Fi is power consumption. In terms of power consumption, Wi-FiHaLow adopts a lower frequency of 700~900 and a narrower channel occupation width, which makes the power consumption at the same level as Bluetooth, ZigBee and other short-distance wireless transmission technologies.
In other words, whether you download and install an application or use an app that needs networking for a long time, smart watches that support the Wi-FiHaLow standard will have lower power consumption performance, which corresponds to the improvement of endurance.
Finally, smart glasses. At present, there are two kinds of smart glasses commonly used in the market: household and outdoor. The former is mainly used for audio-visual entertainment, such as watching movies and playing games. The latter is more inclined to answer the phone and listen to music.
In addition to low power consumption, Wi-FiHaLow also supports long-distance transmission, multi-device connection, better wall penetration ability and stronger anti-interference ability. For home smart glasses, if the router is located in the living room, the WiFi connectivity will be worse when used in the room. In addition, if you are not the only one at home and the router does not support Wi-Fi6, using smart glasses may affect the user experience because of network congestion. If the home smart glasses support the Wi-FiHaLow standard, all the above problems may be solved.
The biggest problem with outdoor smart glasses like Huawei glasses is the stability of network connection. For example, in the application scenarios with complex signals such as subway and bus, when listening to songs with outdoor smart glasses, it may be interfered by external signals, resulting in frequent disconnection of equipment. Compared with traditional Wi-Fi and Bluetooth, Wi-FiHaLow has stronger signal anti-interference ability, which can greatly reduce the interference of external signals on smart glasses.
In fact, compared with smart wearable devices, Wi-FiHaLow plays a greater role in the layout of the AIoT market. For example, in intelligent security, because the maximum transmission distance of Wi-FiHaLow is 1000 meters, and as many as 1000 devices can be connected to the same connection point at the same time, a large shopping mall only needs to build an access point of Wi-FiHaLow in one location, which can cover all surveillance cameras supporting the standard within one kilometer. For merchants, the cost of layout security monitoring will be lower.
And Wi-FiHaLow helps to enhance the smart home experience. At present, the experience of smart home is not very good, or it is often disconnected or interfered by signals from other devices in the home, resulting in high delay in actual use. If all smart homes support the Wi-FiHaLow standard, then these problems may be solved.
In fact, Wi-FiHaLow is not a new technology. As early as 20 16, the Wi-Fi alliance announced this standard, but no manufacturer was willing to follow up. Until the domestic Zhuhai Taixin Semiconductor launched the world's first mass-produced chip based on Wi-FiHalow standard, the application scenarios did not have much contact with ordinary consumers.
To tell the truth, Wi-FiHaLow overlaps with Wi-Fi6 in positioning. After all, there is not much difference between the two in indoor application scenarios. In contrast, Wi-FiHaLow is more suitable for outdoor scenes. Obviously, it is a correct decision for the Wi-Fi Alliance to announce the standards again at this time node.
However, considering the progress of the standard from publication to chip mass production to commercialization, manufacturers may not follow up and launch related products. Although many manufacturers have joined the Wi-Fi alliance, including chip manufacturers Intel and Qualcomm in the upstream, and terminal brand manufacturers including Microsoft, Apple and Huawei in the downstream, whether the Wi-FiHaLow standard will be applied to the smart wear field ultimately depends on whether the manufacturers are willing or not. After all, they have learned from the past.
What is wearable device technology? Wearable technology is an innovative technology put forward by MIT Media Lab in 1960s. With this technology, multimedia, sensors, wireless communication and other technologies can be embedded into people's clothes to support gestures, eye movements and other interactive ways. The purpose of wearable technology is to achieve fast data acquisition through "internal connection" and maintain social contact efficiently through ultra-fast content sharing. Get rid of traditional handheld devices and get a seamless network access experience. Wearable health equipment is another branch of wearable equipment which is gradually derived with the development of wearable equipment. Since the 1960s, wearable devices have gradually appeared. In 1970s, the wearable computer with digital camera invented by inventor allen lewis can predict the outcome of casino roulette. 1977, C.C. Colin of the School of Visual Science of Smith-Kettlewell Institute made a vest for the blind. It converts the images obtained by the head-mounted camera into tactile images through the grid on the vest, so that blind people with feet and silver can "see". Broadly speaking, this can be regarded as the world's first wearable health device. Every laboratory thinks that the health field is the most promising field of wearable devices, and the essence of wearable health devices is to intervene and improve human health. Wearable devices are also developing from "information collection" to "direct intervention". Wearable health equipment refers to various common diseases in urban people's graves and banquets. For example, relax and massage the cervical spine anytime and anywhere, or even directly change the bridge to interfere with brain waves to help people sleep. In addition, foreign melons and domestic every have launched their own innovative products in this respect. Comfortable to wear, even without feeling. It is impossible to be completely insensitive to today's wearable health devices. But trying to be light and small is the direction of all enterprises. Compared with professional medical equipment, wearable health equipment is not as effective as professional equipment, but its advantage is that it is convenient and fast, and it can protect and treat the body anytime and anywhere, which has great advantages in preventing and alleviating diseases. The use process should not interfere with normal life. Consumers can't accept health equipment that takes special time and constantly challenges their patience. Therefore, wearable health equipment should be fully considered when designing, so as not to affect the normal life and work of users. The appearance should be suitable for the occasion and environment. Sometimes, wearable devices cannot be "invisible". However, if the appearance of these devices is suitable for the environment or even cool enough, users don't mind showing off with such devices.
What is a smart wearable smart watch?
Smart wearable devices are the general name for intelligent design and development of wearable devices by using wearable technology, such as smart watches and smart bracelets.
What is the working principle of a smart bracelet?
With the whirlwind of smart wearable devices blowing all over the IT world, Google Glass and smart watches continue to be exposed, and the attention is extremely high. The smart bracelet seems to be on fire. Many people must have questions. Seeing these smart watches and smart bracelets sold in the market, they all say that they can detect sports status and sleep through Bluetooth. How do they work? How to realize the function? Let me give you a detailed introduction.
What is the working principle of a smart bracelet? 1
First, the principle of smart bracelet
The motion monitoring function of smart bracelet is realized by gravity acceleration sensor. Gravity sensor is a very mature technology, and mobile phones have been used for a long time. For example, the screen flipping function of smart phones is realized by sensors. Sensors get some basic data by judging people's movements, and then combine the basic information of personal signs input by users to get personalized monitoring data for individuals according to some specific algorithms, such as steps, distances, calories consumed, etc., so as to judge the frequency and intensity of exercise. Because everyone's exercise has different effects with different physical signs, users need to input their own gender, age, height, weight and other information in the APP before using the bracelet to monitor, and the information will be automatically synchronized to the bracelet, and the movement will be monitored through sensors, and finally the function of motion monitoring will be realized through a specific algorithm.
Sleep monitoring is also achieved by the same sensor technology. According to brain wave signals, people's sleep can be divided into five stages: falling asleep, shallow sleep, deep sleep and rapid eye movement (REM). People's brain waves can change rapidly at different stages. Interestingly, the gravity acceleration sensor does not directly detect brain waves, so it judges which stage of sleep is based on the amplitude and frequency of people's movements during sleep. The smart alarm clock function of the bracelet will wake the user during the rapid eye movement period. "Because during the rapid eye movement period, sleepers will have high-frequency and low-amplitude brain waves similar to those when they are awake, and they are more likely to be awakened. If they wake up at this time, they will feel.
Second, what is the working principle of the smart bracelet?
Heart rate: there are two electrode pads (ECG principle), which can be used to check the ready-made scheme online;
Respiratory rate: three-dimensional acceleration sensor (vibration principle) can be used, but there is no ready-made scheme, so we need to make our own model, and there should be a better filtering algorithm, which is very promising;
Blood pressure, so simple, I don't know what to do.
Difficulty: But the difficulty of this product lies in how to collect all kinds of data with a simple product without disturbing users. The data here involves blood pressure, blood sugar, blood oxygen, pulse and other data. Our normal process of measuring these data is to draw blood to measure blood sugar and oxygen content, to measure body temperature with a thermometer, and to measure blood pressure with compressed blood vessels.
This problem is actually a problem faced by many smart devices now. The sports bracelet still stays in the function of obtaining position information through the gyroscope and analyzing various complex States of the human body from exercise to sleep, and the accuracy of the data is limited.
Imagine this:
1, through the principle of reflection, the oxygen content of human red blood cells is detected.
2. By detecting the pulse conduction rate and calculating the time difference between ECG detection and pulse detection, blood pressure information can be obtained.
3. Through internal and external temperature induction, more accurate human body temperature value can be obtained.
4. After detecting metabolic heat, blood oxygen saturation and blood flow velocity, the blood glucose concentration was calculated by metabolic heat integral method.
The biggest breakthrough of this principle is to realize the non-invasive collection of sign data with little interference to people. The changes of blood pressure, blood sugar and body temperature are very helpful for people with hypertension, diabetes and pregnant women to test their physical data. Guo Hui said that this principle has passed the theoretical certification and the hardware design is being planned. Of course, he also hopes to have more investment to promote the development of the project. At present, the bottleneck of smart devices is mostly information acquisition. If Guo Hui's team can realize this idea, it won't be a problem to make bracelets and watches.
The core is a 3-axis gravity acceleration sensor, and its output value is converted into living momentum by algorithm. The basic principle is to calculate the amount of work done to overcome gravity and inertia, so it is necessary to bring in weight to participate in the calculation. Now all bracelets, trackers, etc., regardless of brand model, are the weights set by users from the outside when synchronizing. Formula or something can refer to some papers of physical education major. In addition, the bracelet has a special feature that it can only stay on one hand, so compared with the ordinary preset user who will wear a tracker at the center of gravity of the human body, the algorithm is not feasible and needs to be corrected by a special algorithm. The specific algorithm is a trade secret.
Basically, it is a three-axis accelerometer, and then an algorithm is used to judge the number of steps of people. Algorithm is the core, I can't tell you.
What is the working principle of the smart bracelet 2?
First of all, briefly introduce the smart bracelet.
A smart bracelet is a wearable smart device. Through this bracelet, users can record real-time data such as exercise, sleep and diet in daily life, and synchronize these data to iOS or Android devices to play a role in guiding healthy life through data. The smart bracelets that attract attention mainly include Nike+Fuelband, FitbitFlex, JawboneUp2 and several domestic brand products that follow up.
"Google Glass" is not on sale yet, and "Smart Bracelet" is coming. When traditional e-commerce is still "true" to the price of a home appliance, Yi Xun. Com, a subsidiary of Tencent e-commerce, has taken a different approach and shifted its focus to the joint development and introduction of high-tech products. Since yesterday, the smart bracelet "Jawboneup" has been sold exclusively in China, becoming the first e-commerce company in China to officially enter the Internet "wearable smart device" market.
It is reported that the "Jawboneup" smart bracelet launched by this network is a very popular wearable smart device on the market. It is widely welcomed by white-collar consumers.
Second, the structure of the smart bracelet
The main body of the smart bracelet is generally made of medical rubber and memory rubber.
Natural non-toxic, high-grade design, fashion generous, both the function of sports health secretary, but also the function of fashion accessories, streamlined garlands, and diverse colors.
Silver-plated metal caps at both ends are very suitable for wearing, which is different from traditional bracelets with locks or buttons.
The smart bracelet has a built-in lithium battery with a battery life of 10 days, a vibration motor and a motion-sensing accelerometer. The silver cap at the end of the bracelet is a button to change the settings, and the other section is a 3.5 mm plug connected to the mobile phone.
Third, the function of the smart bracelet
This design style of smart bracelet is quite attractive to users who are used to wearing jewelry. More importantly, the design style of the bracelet is versatile. Moreover, although the small hand ring is not big, its function is still relatively powerful. For example, it can be said to be an advanced pedometer, which has general functions such as counting steps, measuring distances, calories and fat, as well as special functions such as sleep monitoring, advanced waterproof, Bluetooth 4.0 data transmission and fatigue reminder.
Its built-in battery can be used for 10 days, the vibration motor is very practical, and the simple design style can also play a decorative role in jewelry.
Take sleeping as an example. Set Jawboneup to sleep mode before going to bed, and get up the next day and synchronize with iPhone device, so you can see your sleep time, waking time, deep sleep/light sleep, overall sleep quality and other information. For people who lose weight and exercise, the "JawboneUP" smart bracelet is a responsible personal trainer, which can tell you the daily exercise path, calorie consumption and calorie intake. You can also set exercise goals, such as how many steps to take, how many calories to burn, and so on. It will also show the completion rate of exercise in real time, and exercise weight loss can be quantified, which is a great boon for those who can't persist. The smart bracelet has advanced waterproof function, and can swim in shallow water or rivers within the range of 10 meter, which overcomes the defect that the traditional pedometer cannot track swimming and is more widely used.
The smart bracelet also has a social network sharing function. For example, users can share sleep quality, diet, exercise and emotional records by binding Facebook or Twitter. For the elderly, it is also a patron saint. Through the built-in GPS connector, you can inform the relevant hospital or family members of your physical condition and location at any time.
Fourth, the working principle of the smart bracelet
Covered with waterproof rubber material one meter deep, it is said that the texture is skin-friendly and comfortable to wear. Provide a variety of colors to choose from, S, M, L three sizes also meet the needs of different people. 3.5mm headphone jack can not only charge, but also synchronize data with mobile phone. It can last 65,438+00 days after being fully charged. Two pieces of silver-plated metal caps and Jawbone logo, accompanied by the flashing of breathing light in different states, make the whole bracelet look very fashionable and exquisite.
Specially configured mobile phone application can easily check your daily exercise data (including exercise time, kilometers and steps walked, calories burned, etc.) by connecting to iPhone. ) and sleep data (total sleep time, wake-up time, wake-up times at night, etc. ). You can also input dietary data through the mobile phone, and the bracelet will give nutritional information according to the type of food for users' reference and adjust their eating habits.
What are the advantages of smart wearable devices?
Wearable devices are portable devices that are directly worn on the body or integrated into the clothes or accessories of users. \x0d\ Smart wearable devices are the general name of wearable devices that use wearable technology to intelligently design and develop daily wear. Such as glasses, gloves, watches, clothes and shoes. It mainly combines the Internet of Things and cloud computing. By keeping up with the development trend of the Internet era, intelligent and commercialized wearable devices have become the "darling" of the new century. \x0d\ has the following four advantages: \x0d\ 1. Wearable devices are more convenient to operate. Just as smart phones are more portable than PCs, wearable smart devices are not only more portable than other mobile devices, but also more convenient to use. They can almost completely rely on the natural actions of the human body to achieve the operation, such as blinking, waving, opening the recording and other photo actions. This is obviously more attractive than holding the device button with both hands, sliding, flipping through menus and searching. \x0d\ Second, wearable devices are carried around the clock. Although smart phones are popular, they can't sleep at night, but wearable devices such as watches and bracelets can. Of course, sleeping with arms is not an advantage, but it can be carried around the clock, which is conducive to continuous health or medical monitoring of users. In addition, silent sleep wake-up through skin vibration and so on. The 24-hour close-fitting feature makes wearable devices not easy to be stolen or lost. \x0d\ Third, wearable devices are more beautiful and fashionable. Many people buy iPhone5 because it is fashionable and attractive, not because it is powerful. Some people are even content to show off their vanity. When it is really used for functions, it is still limited to making phone calls, texting and chatting, and other software is used less. I believe that smart necklaces, smart earrings or smart bracelets produced in the future are better than jewelry that has no practical use. Naturally, wearable devices inlaid with jewelry, gold and diamonds are not excluded, which is the first choice to show off wealth. \x0d\ Fourth, wearable devices enhance people's abilities. With the rapid development of cloud computing, wearable devices will bring enormous computing power to users. Because wearable devices are almost integrated with the human body, powerful computing power is like being born, just like everyone has super powers. It is not difficult to imagine: you can know tomorrow's weather without turning on your mobile phone, browser or blinking; A glance at an English newspaper can translate it immediately. Standing outside the shopping mall, you will see if there are any businesses on sale; Sitting in the car, you can see the road conditions ten kilometers away. Of course, there are many advantages that ofweek wearable devices hope to adopt.
What is the application direction of smart wearable devices in smart logistics technology?
In-warehouse technology. According to the query of Baidu question bank, smart wearable devices belong to the warehouse technology in the application direction of smart logistics technology. Baidu question bank aims to provide efficient and intelligent preparation service for candidates, covering the fields of college entrance examination, accounting, construction, professional qualification, medical and health care, computer, education and so on.