On September 9, 2014, at the highly anticipated iPhone6 ​​conference, Apple announced their smart watch APPLE WATCH. This smart watch has a sapphire screen with calls, Siri voice, messaging and more. It is defined by Apple CEO Cook as "a revolutionary product." Can call, can receive information, such a fully functional watch, wearing must be very cool.
Wait a minute, isn't this a mobile phone? In addition to these functions, is there no other useful value that everyone deserves to care about?
Of course, APPLE WATCH is not just a combination of a watch and a mobile phone. It is also a smart bracelet. Nowadays, the functions of smart bracelets on the market such as health tracking and motion monitoring are all available.
smart wristband
The smart bracelet is a wearable smart device, and many people who are losing weight and prefer to exercise are very fond of smart bracelets. The smart bracelet can record real-time data on exercise, sleep and diet in daily life, and synchronize these data with the software devices on the mobile phone to play a role in guiding healthy living through data. For some people with diseases, Smart bracelets can also help them understand their physical condition in a timely manner, and even use smart bracelets and software to submit their information to hospital doctors.
In addition to carrying more hardware and features, APPLE WATCH's health monitoring is basically the same as other brands' smart bracelets on the market, so APPLE WATCH is also a smart bracelet.
How does the smart bracelet test human health data?
The accelerometer, gyroscope, compass and various sensors hidden in the wristband can monitor some data of the human body, and can also specify a diet exercise plan for people. The smart bracelet really makes many people feel excited. But such a small bracelet does not need to draw blood, nor does it need to stick electrodes on other parts of the body. How does it monitor the human body?
Mr. Zhao, a manufacturer of smart bracelets, told us in an interview that the current smart bracelet is equipped with a variety of sensors, and many smart phones also have sensors, such as the most basic acceleration sensor, distance sensor, Barometer / air pressure sensor, etc. There are sensors on the smart bracelet that monitor heart rate, blood oxygen, and skin temperature. These sensors ensure that information is collected and detected without harming the human body, such as measuring blood pressure, and its data is obtained by testing changes in skin blood distribution.
APPLE WATCH's monitoring heart rate function, which was promoted at the time of launch, also utilizes new technology. It relies on the back cover area of ​​the watch and has a special sensor under the protection of sapphire crystal. It uses infrared and visible LEDs and photoreceptors to detect users. Heart rate status.
In addition to the inside of the human body, accelerometers, gyroscopes, compasses, and pressure sensors in the smart bracelet are used to monitor the movement of the arm and the amplitude of the swing to determine the user's activity during motion monitoring.
Compared with the detection of physical health, the existing smart bracelet has matured in motion monitoring, so the monitoring performance is guaranteed, and it has been developed to achieve human consumption based on body weight, exercise time and speed. An approximate value for a calorie. The smart bracelet also records the user's sleep state. Use a device such as a sensor to detect the subtle movements of the human body during sleep, and analyze the state of the person while sleeping.
Through these sensors, the smart bracelet can collect useful information about the human body. But just collecting is not enough. Mr. Zhao told us that after collecting various data of the human body, the task of the smart bracelet is basically achieved, and the rest of the work is done by the mobile phone software synchronized with the bracelet, which provides the final detection. result.
Take APPLE WATCH as an example. It has about 10 sensors. The information collected by the sensor is given to Apple's HealthKit application or compatible special software. The software analyzes the collected data and finally provides useful suggestions to the user.
Smart bracelet essential features: health tracking and motion monitoring
I believe that many people hope that they can have a private doctor who is completely their own. They can do a check for themselves every day, and tell you that you are fattening every time you eat too much.
This wish is good, but even if it is my own mother, it is very difficult to do so in every possible way.
Mr. Zhao believes that the smart bracelet is trying to fulfill everyone's dreams. People with high blood pressure or diabetes want to be able to monitor their physical condition. People who lose weight and insomnia also want to have a helper who can guarantee that they can provide science when eating and sleeping. Suggestions and warnings.
In terms of current technological development, in addition to smart bracelets or other wearable devices, it is still difficult to achieve the above points. Even if it is done, it must sacrifice other things. After all, diabetics don't go shopping with blood glucose meters, people who lose weight don't put a weighing device in their bags, and the small and convenient smart bracelet can ignore most environmental factors and give health. One way people can monitor their bodies is the meaning of smart bracelets and similar devices being designed.
Mr. Zhao also said that with the development of smart bracelets, various functions have been integrated into the bracelet, and health tracking and motion monitoring have become the iconic functions of smart bracelets, although there are still controversies on issues such as sleep measurement. But in general the practicality can be guaranteed. He also joked that even if you don't trust the bracelet, wearing such a beautiful bracelet will make you feel better.
In fact, if they think of the price of this beautiful bracelet, the mood is not good.
The details of life have to listen to it.
No equipment or technology can avoid defects and problems.
On the Internet, users have responded to the situation that a brand of smart bracelets can not be charged. The survey results at the time said that this was caused by a design flaw in the bracelet. In addition to this, the sleep measurement mentioned earlier is also a big controversy. The depth of sleep is generally measured by the decrease in physical activity and the decrease in sensory sensitivity. The current smart bracelet is difficult to measure the depth of sleep. These are all technical problems that need to be overcome in equipment such as smart bracelets.
There are two disadvantages to the smart bracelet that bring a lot of inconvenience.
First of all, the smart bracelet can not be removed at will, even when taking a bath or sleeping, otherwise its function can not be reflected. Such a device may occupy a part of the user's space, I believe most people do not like this, especially those who feel that their girlfriend is annoying, because this bracelet is much more powerful than a girlfriend.
Second, the bracelet and software will be monitored to give the user a specific activity and diet plan. Since the user has purchased the product, he should adjust his life according to its way, especially sports. This feature raises the relationship between the bracelet and the person from a technical issue to a philosophical level. A bracelet gives people plans and instructions, but the execution of these instructions depends entirely on human consciousness. What will happen? You know.
With the existing technology of smart bracelets and wearable devices, these two problems cannot be solved. I don't know if there will be a better solution in the future. In fact, the solution is not without it now.
Don't buy it.
The future of smart bracelets
There used to be a saying that the purpose of intelligent mobile phones is to change the role of mobile phones in human daily life. The original mobile phone was the courier and operator responsible for sending and receiving information. After the arrival of the smart phone, the mobile phone became a private secretary, responsible for processing information and providing information.
The emergence of smart bracelets and other wearable devices seems to indicate that mobile phones and smart bracelets will change their roles again, detect human conditions in real time, give health advice and planning, which is beyond the scope of the “secretaryâ€. It is said that the smart bracelet and its functions are further expanding the functions of the smartphone. The future mobile phones and bracelets may be combined. Just as APPLE WATCH not only has the function of a smart bracelet, the functions of the two can be integrated. , once again, the role change after completing the smartphone.
For human health, the development goal of wearable devices must be to replace the original, relatively inefficient health monitoring methods as much as possible. Nowadays, we already have watch-type sphygmomanometers, and smart watches have brought us a series of monitoring methods. In the future, when the monitoring functions of smart bracelets and other devices are truly accurate and timely, we will give them What features are added?
"Master, you are expected to have a diarrhea after half an hour, please do not go out for the time being."
The development of direct-drive servo motors for steering wheels was mainly targeted at precision agricultural machinery. It can complete agricultural machinery operations, achieve precise positioning, improve agricultural productivity, effectively use agricultural resources, and protect the ecological environment. This is an effective way to achieve high-quality, high-yield, low-consumption, and sustainable environmentally-friendly agriculture. It can achieve fast, efficient, high-precision and automated operations on large areas of arable land. It is mainly used in multiple production links of land production, pesticide sowing, harvesting and spraying, which greatly improves production efficiency and land use.
Motor design characteristics:
adopts direct drive motor design
Waterproof and dustproof design
Integrated design of motor and servo control
Easy and fast installation
The rotor is directly coupled to the load shaft
Control performance characteristics:
AC Servo Solution Design
SVPWM vector control, fast system dynamic response
Dedicated encoder, high control accuracy and good stability
With speed control mode and position control mode
Extremely high running accuracy:
This machine adopts sine wave, vector control and high-precision magnetic encoder, with high control precision, which can ensure that the vehicle can walk within the error range of ± 2cm.
Good control line performance:
The torque of the direct drive servo motor increases in proportion to the input current and does not change with speed and angular position. The relationship between torque and current is linear. Multi-pole structure design, low motor torque ripple coefficient, stable operation, can effectively reduce the "S" curve amplitude when the vehicle is going straight
Powerful acceleration and deceleration capabilities:
The direct drive design of the servo motor enables gearless transmission. The ratio of torque to inertia on the load shaft is much better than gear transmission, which greatly improves the acceleration capability of the system, and greatly improves the ability to go online quickly in applications and the ability to correct errors under high-speed vehicle operation
Not easily deformed
The direct drive motor is mounted directly on the load shaft. No gear gap, no elastic deformation, high transmission efficiency, good rigidity, etc., suitable for steering wheel control characteristics. While ensuring high torque, it is also convenient for human emergency operation
Faster response time
The mechanical constant and electrical time constant of the direct drive servo motor are small, which ensures fast response in applications under a wide range of operating speeds, greatly improving the sensitivity of the system and improving the straight line of operation.
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Jinan Keya Electron Science And Technology Co., Ltd. , https://www.keyaservo.com