preface

Once upon a time, all kinds of smart watches and smart bracelets mushroomed in front of consumers. From the main fashion sports to waterproof swimming, from sleep detection to mobile payment, a product was randomly pulled out. When I saw it, there were more than ten or twenty functions. While I admired the good copywriting of the product, I was also secretly sorry. The product functions were superimposed Homogeneity is so serious that it is hard to find a simple and functional exercise heart rate bracelet.

Personally, I love sports, so I always pay attention to the intelligent sports bracelet. I used to use a sports heart rate bracelet called WeCoach Pro, and I can't tell the performance of it in detail. The most unsatisfactory thing about WeCoach Pro is that it doesn't display the screen, and can't see the time, information, and real-time heart rate. Users are not sticky enough to use it, and now they lie at home and eat ashes.

What the author brings to you today is a heart rate bracelet with screen display. His full name is Evei i7 intelligent heart rate bracelet, which uses AMS to accurately detect the heart rate. It is a bracelet that can continuously monitor the heart rate during exercise, and accurately prompt five heart rate ranges, 24-hour real-time heart rate monitoring, all-weather recording of the user's every heartbeat, good heart rate, visible, which is also my most valued function, very practical in daily sports life.  

Appearance

The packaging design of Evian i7 is very simple, similar to the simple style of Apple series products. I don't know how long this simple wind will last, but who makes it look good.

The paper box is made of clean white, and the printing is very simple. It looks good.

The Evian i7 adopts a metal body, weighing about 180g, with moderate weight. The whole body is sanded, and the metal texture is relatively strong.

The front of the Evian i7 dial is made of 2.5D curved reinforced glass, and the strap is made of frosted TPU medical grade material.

Popularize science: TPU， Its scientific name is thermoplastic polyurethane elastomer, a transparent plastic particle that can be melted into the mold by injection molding level heating, and can be changed into any color; TPU medical grade material means that the material has high biocompatibility, is harmless to human body, and has sufficient elasticity and tear resistance.

The Ivy i7 watchband feels a little hard. The surface feels good. It's very comfortable to wear on the wrist.

The back of the i7 is mainly the charging interface between the heart rate sensor and the magnet. The heart rate monitor protrudes from the back, and the protruding height is slightly larger. If the watchband is too tight, the back of the hand will feel a little uncomfortable. In my experience, the inside of the wrist will be more comfortable. For the accuracy of heart rate reading, it is recommended not to wear it loosely.

The charging interface of i7 adopts the three-point contact mode of magnet adsorption. In actual charging, the magnetic force is very strong, it is easy to be attracted together, and it has a fool proof design. The magnet can only be attracted when it is placed in one direction. In the opposite direction, the polarity of the magnet repels each other, and it cannot be installed. It is a very careful and considerate design. In actual use, it solves some problems for users in Madagascar.

But here comes the slot The charging line is so short to create a tall product. Can we not save this money?

Parameters

The Ivy I7 intelligent heart rate bracelet uses AMS to accurately detect the heart rate, accurately prompt five heart rate intervals, and 7 * 24h real-time heart rate monitoring to record your heart rate all day long. The specific parameters are as follows:

The Evian i7 screen uses a low-power MemoryLCD display, which can be clearly displayed even in direct light. The capacitive touch screen should be a single touch screen from the perspective of actual operation. The i7 is equipped with 100mAh polymer lithium-ion battery. Large screen display and real-time heart rate monitoring are major power consumers. According to the actual wearing condition, 100mAh can last for about 4 to 5 days, and its endurance may be a weakness of i7. It is self-evident that the duration of a bracelet is of great importance to it. All humanized designs are based on the user's convenience, which is to take care of the user's "laziness". Which one will you choose if you charge the phone every day or every week?

So, some students have given solutions. Can you choose to turn off the function of automatic heart rate monitoring? The answer is yes. Evey officials wisely added an option of "automatic heart rate detection" in the settings, which means that users can selectively turn on automatic heart rate monitoring. Students who like long endurance can turn it off. Students who like to check their heart rate 24 hours at any time can turn it on. It's a good idea to take what they need.

As for the display screen, some students may mistakenly think it is an electronic ink screen, but there are differences. I will talk about their differences when I have time.

Function

The main interface is very clean, with time, date, week and other information. The upper left corner is the Bluetooth connection mark, and the upper right corner is the power icon. Sliding up will show steps, kilometers, heart rate and calories consumed. Sliding left will show sports, messages and functions respectively.

The number of steps, kilometers, heart rate and calories consumed will appear when sliding upward.

Slide left to display the movement, message and function respectively. Message push supports calls, SMS QQ、 WeChat message push can store 8 messages. WeChat i7 selects several message push options such as WeChat and SMS by default, and users can customize the opening and closing of certain types of message push, so that people who prefer quietness can not be disturbed by many push messages.

Step recording function is more practical and real-time display. Function interface, anti black display, language switch, device search, automatic heart rate and other setting options.

Replace the dial option. There are three built-in dials for users to choose from. The effect is good.

Demonstration video of the actual operation of Evian i7 bracelet:

Demo video of the automatic monitoring of heart rate setting of Evian i7 bracelet:

Software

Evian i7 supports Android and iOS. Scan the QR code on the manual to download the APP Evian Health Assistant. After installation, start the APP, register an account, and log in to QQ and WeChat. By means of social binding accounts, i7 has skillfully accessed to the social platform, and can interact and communicate with its QQ and WeChat friends to achieve the connection of Internet of Things hardware+social platform, which is a great innovation.

The main interface of APP has a little more information, giving people a sense of chaos. The navigation bar of the bottom "home page" is not completely displayed. The software engineer should pull out 50 boards There is nothing to say about Bluetooth connected devices. Click the device status to set the following content.

Message push setting interface, push support calls, SMS QQ、 WeChat message push can store 8 messages. WeChat i7 selects several message push options such as WeChat and SMS by default, and users can customize the opening and closing of certain types of message push, so that people who prefer quietness can not be disturbed by many push messages. Let's focus on the backlight setting option. The i7 LCD backlight is off by default, because the LCD will display clearly when there is external light in the daytime. Only when there is no ambient light at night, The i7 can't see anything when its eyes are dark. It shows that the i7 has taken this problem into consideration when designing, and has designed a separate backlight circuit. If the backlight is always on for 24 hours, it is obviously a challenge to the endurance. So the APP provides such a backlight option, which I think is a good solution.

Moving target setting interface,

For sports goal setting, whether you want to keep your current figure or lose weight, it's better to choose according to your own circumstances. But the design of APP jump here is very awkward for personal experience, and 50 boards for software engineers are drawn here

There are also APP slots. The home page is connected to Bluetooth. Why is the weight page always searching for Bluetooth devices??

Sports alerts and historical data need to be experienced for a few more days.

To carry forward the Internet spirit and share sports achievements is actually to show off Who said you..

The alarm clock, heart rate recording and personal feeling accuracy still need to be improved.

Voice function, relatively quiet environment, good recognition, iFLYTEK's platform??

GPS track has three options: "riding", "running" and "walking".

Enter the walking mode, and display the speed, average speed, consumed heat and speed curve in real time. The precision of GPS track needs to be improved, and users can understand each movement in detail through these records.

Smart shot, smart? I don't agree. The bracelet can't start the camera, and the autofocus is not used.

The sleep monitoring function will be described in detail below. After a night's sleep record, it's really like a model. There are sleep data analysis, main factors affecting sleep, suggestions, etc. It's good to listen. If you really have bad sleep, you'd better go to the hospital to see a doctor.

Comparison

There is a sports bracelet called WeCoach Pro on hand, which is mainly used for sports coach and heart rate monitoring. Voice coach is not the specialty of i7. Since they are all heart rate monitoring bracelets, there is work to do. First, let's see the comparison of the appearance of the two goods.

The beauty is good or bad. Each has its own advantages. The heart rate data run out is also similar. The heart rate of WeCoach Pro is 74, and that of i7 is 71.

Compare the heart rate sensors of these two products. They are also green LED. The WeCoach Pro heart rate meter module is larger. It is not necessarily good when it is larger. It has a lot to do with the algorithm.

First, let's look at how the heart rate sensor works, leaving aside the algorithm. The human body generates cardiac current every time the heart beats, so there is an electrode type heart rate sensor. We go to the hospital to have an ECG examination using this principle. The heart rate chest band is made using this principle. The pole piece in the chest band is responsible for collecting the fluctuation amplitude of the user's cardiac current, recording and generating an ECG.

But what if this thing is too big to fit into the smart bracelet?

Another scheme is called photoelectric transmission measurement method. There are two types of light sources: infrared light and green light. The infrared light uses the absorbance change of blood hemoglobin in the blood vessel to measure the pulse, and the infrared LED is responsible for transmitting the beam sensor to receive the reflection circuit; Green light is the change of light transmittance caused by the density change of blood in the arm blood vessels when pulsating. The green LED is responsible for emitting light waves with a fixed green wavelength, and the photosensitive sensor is responsible for receiving the light reflected from the arm skin and calculating the intensity change, and then converting it into the heart rate value.

So is infrared light or green light good?

The green light photoelectric measurement method is effective. Don't you see that the above two bracelets are all green? Because infrared light is very vulnerable to external interference, resulting in measurement result deviation, component manufacturers prefer green LED. For example, SON7015, a low-power heart rate detection scheme of SON Electronics, also uses green LED.

Is it true that heart rate bracelet can monitor sleep quality?

The pulse rate of the human body changes with the change of the sleep cycle, and the pulse rate will decrease when the sleep deepens. Since the heart rate can monitor the data, the sleep quality will be monitored by the change of the heart rate during the sleep time.

So how to judge whether the human body has entered the sleep state?

I guess the first thing is to set the time period. No matter how much you sleep in the daytime, there will be no data; Secondly, we can judge the amplitude and frequency of the human body's sleep roll over through the three-axis acceleration sensor, judge whether it is in sleep and whether it is in a deep sleep state. If you take off the bracelet and leave it overnight, there should be no data. Different manufacturers will have different algorithms, which cannot be generalized.

At present, most wearable devices are equipped with photoelectric heart rate sensors. Compared with electrode type heart rate sensors, the error is large, and the monitored data can only be used as reference, which does not mean that photoelectric heart rate sensors are garbage and useless. If you can continuously monitor and record heart rate data, and collate and analyze the data, the heart rate change curve will be given As well as suggestions on sleep quality, it is still very helpful for users to develop good work and rest habits.

Summary

The Evian i7 performs well in actual use. Several functions that the author focuses on can meet personal needs. When exercising, the user does not need to take out his mobile phone to check the time, can check the heart rate change in real time during exercise, and can automatically monitor the sleep quality. It is the most practical and convenient intelligent bracelet I have used in the past. Of course, the i7 has many shortcomings, such as screen display quality, touch experience and other issues. I can only say that I hope that students can experience i7 with an inclusive attitude, and you may not be disappointed. If the price is 299 yuan, you should not expect to have a gorgeous and delicate large color screen, IOS like smooth system, 20 day long endurance and so on. If you look at it with a calm mind, there will be surprises. For example, when you call during a run, you can hang up through i7 without taking out your mobile phone.

On the whole, the Evian i7 is fully worth the price of 299, and it would be better if the details could be further improved. I hope the following questions can be fed back to the manufacturer in time to better improve this product.

Advantages:

1. Turn the wrist to light up, the heart rate is automatically monitored, and the screen displays the heart rate;

2. Real time screen display steps;

3. When the phone calls, you can hang up directly through the bracelet;

4. Automatic sleep detection, very practical;     

Insufficient:

1. The endurance needs to be improved;

2. The touch screen resolution is low and the touch control is not sensitive. make complaints;

3. The strap material is hard;

4. Firmware and APP need to be improved

5. Occasional disconnection of Bluetooth connection;

Finally, thanks for the trial products provided by Lei Feng!