# The original innovator # was the only bracelet with a heart rate monitor within a hundred dollars – 37-degree bracelet simple dismantling
At that time, 15 years ago, because the winter break wrote a topic, he took the prize at the Shanghai level and had a little bonus, so he wanted to push down the whole thing. Just when Xiaomi had a bracelet, he aimed. (mainly cheap)
Before I do things, I have a habit to first understand the details of understanding things.
At that time, there were just a handful of bracelets, music, millet, 37 °, but also some unknown can not remember. .
Looking at the Internet comprehensively, the approximate functions of the sleep detection and the sleep detection are almost the same.
The music has a display but no independent app, and the public number in Weixin is bound (there was no small program at the time)
Millet vibrates with long stand-by time, independent app, price butcher, fan base size
37° Vibration Free Standby Small Meter Short but with Heart Rate Monitoring Blood Pressure Monitoring
The first on the heart of the pass, there is no independent app always feel how inconvenient to use. In particular, the red rice 1s that used to be used for a long time in the original mobile phone was not required to be equipped with a card with a lot of information on the low-message page, and the experience was not good.
Although it wasn't any rice noodles, Xiaomi did give me a good impression. In addition to the mobile phone at home now own part-time earn money to buy 7p are all millet. Red rice 1s, note2, note4, millet 3, 4, MAX. Recently also ready to buy a 5s. Aunt Zhang had never been silently looking for a silent purchase. She was too lazy to write originality, so no accidental article was written. Including the first batch of iph7p that received the goods, now I think I feel a lot of lost gold coins
Pull back, at that time very heart millet, almost bought it, then look at the introduction, did not mention heart rate monitoring this kind of thing, EXM? ? ?
At the time of the impression, I could accept this bracelet without a screen, and I could accept it when it was too big and ugly. But you can't measure the heart-rate function of this high place and then I will pray to you. Bracelet can not measure heart rate only step and some metaphysical functions I want you to do? What's the difference between this pedometer and my physical measurement?
Well, you can't manage that he is dead.
Is it a simple structure? It's one step up and down with a little hammer. At that time, I got back and was idle and idly shaken 9999
You say that I can realize a thing that does not require money. Why do you need to spend a small amount of money?
Then I found out that I was wrong. I didn’t even have heart rate monitoring in most cheap bracelets on the market at that time.
Ah ah, I shouted the spell three times.
The demons are quick to leave
The demons are quick to leave
The demons are quick to leave
Just left this - 37 degree bracelet
37 degree bracelet health dynamic blood pressure heart rate sleep intelligence emotion movement step counter waterproof Bluetooth IOS Android 159 yuan Lynx featured direct link Jingdong bought but it is gone. The last Tmall official shop to put. At the time it was priced at 99. Later it was said that it was not profitable and it rose to 119. Now it did not expect to be more expensive.
This was the first bracelet that was available at the time. It was also the first thing to buy in the dog east. To tell the truth, after selling the dog, it was really immodest. After the sale, several bracelets were sold. However, the quality of this thing is not good. how.
Appearance GalleryThere is no screw around the whole ring of the bracelet, and if the glue is estimated to be sticky, it will be blown by the hair dryer.
Before the demolition forget to take a supplement. Look here there are two triangles estimated to be after the sale is good to dismantling it right before this fierce blow and then opened it. After discovering wrong thoughts, these two triangulations are positive and negative. .
Some parts of the film were missed when the film was taken off. This film was shot when the camera was unable to be charged afterwards.
The battery pack is 157mah (millet bracelet is 41mAh), which is larger than other bracelets, but because of heart rate monitoring and blood pressure monitoring, the battery life is only 5-7 days. Recently, she suddenly used electricity such as urine collapse, and after one charge, it was less than one day. Taobao could not find such a battery pack and simply removed it.
This is the back of the bracelet case with two electric shocks. The inside of the app says that after closing the bracelet, you need to hit the ring twice consecutively before opening, but it doesn't say where to knock. It is estimated that this is a device that senses a tap.
The positive and negative sides after taking it down
Close-up, you can see a shield on the left and right, after all, two sensors. On the left is the heart rate, green light. Right blood pressure, white light.
The shield is welded and there is no tool to get it off. Find a picture on the Internet.
The following content is Baidu:
Red: MT2502
Yellow: NRF51822
Blue: AFE4403
Green: Green sensor orange: Another set of sensors Purple: Accelerometers Obviously the hardware design concept is different from that of the general wristband in terms of hardware types and numbers. In general, look at the main system architecture is a very special model, that is, MT2502+NRF51822 dual processor design, it is estimated that the general NRF51822 kernel computing ability can also face ordinary G-senser, complex processing of Cortex for optical information The core of -M0 is somewhat incompetent. Also need to ensure low power consumption, so the use of dual-processor solutions. Just looking at the 37-degree wristband hardware design from this architecture is definitely not the general bracelet scheme.
The Bong and Huawei Bracelet processors also use the NRF51822, but they are all uniprocessors. The other processor is MTK MT2502. Many friends are familiar with MTK is a chip maker of mobile phone solutions, and MT2502 is MTK2 is a high-performance chip launched in 2014 to enter the wearable device.
Next, let's look at the core 2 groups of optical sensors of the 37-degree wristband. You read it with no mistake. It is 2 groups. Each group has its own optical launcher and receiver sender.
The wristband has a function to measure the heart rate, and the disassembled one sees the TI AFE4403, a set of sensors used with the green LED. Friends who saw MOTO360 dismantling should know that MOTO360 also uses a group of green sensors to measure heart rate. The front-end processing chip used is TI's AFE4490, while AFE4403 is a newer generation than the AFE4490 with a smaller package size. The front optical module is a module containing a dual green LED+receiver, which is said to greatly increase the signal-to-noise ratio. And this optical module installs a separate PCB board that can be removed from the motherboard. This design will undoubtedly greatly increase the complexity of product assembly and assembly, and such a small PCB board is also a certain degree of difficulty in processing.
Is it done to set the sensor module to a certain height? It seems to fight for accuracy. Another group of optical sensors is more mysterious. It consists of two left and right LEDs and an optical sensor that receives the middle one. The manufacturer merely described that the optical emitting devices are all specially customized.
After a closer look at the hardware of the wristband and discovering many TVS chips, TVS can effectively prevent surge surges and reduce transient voltage or current interference. This is also an uncommon design in other wristbands. In many of the three or four hundred consumer products, design is often omitted in the case of TVS. 37-degree bracelet for stability and performance, hardware is really at a price.
It means that this bracelet is very powerful
Then hand shakes and finds that the heart rate sensor can squat down
The printing word above is very confusing. It is estimated that Zhang Aunt’s compression is even less clear. However, what is the relationship? I can’t see clearly.
The contents of the bracelet are not complicated and it is almost the same. Originally wanted to see if there was anything wrong with the battery, and nothing was found in the drum.
Although this wristband is rarely a bracelet with heart rate monitoring, it is also quite good-looking, cnc chamfering process plus the front cover, Yan value counted high, but waterproof really is flawed.
Let's look at the first bracelet first. At that time, the ball was played one afternoon the next day. In May, Shanghai was already quite hot. The wristband was full of sweat. Take a look and get into the water.
Vapor invaded and left the imprint after it was dried. One hundred dollars is money, not to mention buying. The next day, he sought a replacement for Jingdong.
Check it out, waterproof level ip54, prevent splashing water. Wearing swimming? nonexistent
For a new one, there was also a little steam after playing, but it wasn't so obvious and it didn't change.
Although about half a year later, the firmware of the upgraded wristband rose to half into the brush, and then he found a customer service and changed a new one.
The third bracelet was very good, no water brush firmware did not crash, very happy.
Then, after six months passed, the battery collapsed. . Charging has always shown that the green light can rush in, and a charger is not powered for seconds. So taking advantage of the one-year warranty last time, but also to find customer service
The replacement was not sent to Jingdong aftermarket sale, but 37 degrees after their own sales. Shanghai Xuhui's company (really close to home from the school is really close) after the sale in Shanghai, a street in Anhui Province (Chaohu? Hefei? Hefei can not remember really) sent from Shanghai to Shanghai Street and others Tucao for a long time. .
This is the fourth one that has been taken down. In the last few days, it was estimated that the water was broken, and the electricity collapsed. To find customer service because the order is too long (two years) can not be free repair, and then return shipping plus 100 replacement fee. EXM? ? ? At that time, I paid 95 orders to get a 100+ shipping fee. I don't know if it was a new bracelet. This money is worthless.
This bracelet is also sweating
The glasses that measure the heart rate have already been gambling, and it's no wonder that yesterday I wasn't able to test my heart rate with my wristband.
After cleaning, it was found that the two lids were not tight
Originally thinking about taking apart and playing and then putting it back, now I have more thoughts. Just leave it to him.
to sum upAdvantages: At the time, there are few (or only?) bracelets with a heart rate monitor, the value of the face is acceptable, and the app and bracelet firmware is updated so that it can be used in real time to monitor the heart rate and measure blood pressure (for reference only) , measuring emotions (with the function to see if it is good)
This statement is only available in the fourth bracelet.
Disadvantages: no screen, waterproof and fake (only to see the glue did not see other waterproof rubber ring, etc.), APP and firmware have not been updated for a long time, the company suspects quickly gone (JINGDONG off the shelf, Tmall only the first generation Bracelet, second-generation did not sell, blood pressure monitoring is not allowed
Attach a 2 generation chart
It does look a lot better, and water-proof upgrade, but there is still no screen, but also expensive, 299. After the millet light sense version and millet bracelet 2 came out, the pressure was even more serious.
In short, at the time, this was a high-end product with a plain price. No matter whether it was a function or software, it was half a position among other manufacturers, but in the end it did not take a good chance. Perhaps the brand positioning is not the same, other homes are sports bracelets, 37 degrees is the main health monitoring, and finally buried because of various reasons such as visibility.
Now most of the bracelets have heart rate monitoring with a screen, so this old product is not recommended for everyone to buy, but also to increase the price to sell
Then prepare to change a new ring, there is a touch of water, but now the touch screen, but see the evaluation under the glare of visibility is not good, first slow it. Wait and see if there are a few newcomers to the ring. The Xiaomei Crowd Millet was too expensive recently.
Push Button Switches
The Push Button Switches, also known as the control button (referred to as the button), is a low-voltage electrical appliance that is manually and generally can be automatically reset. The Push Button Starter Switch is usually used to issue a start or stop command in the circuit to control the turning on and off of electrical coil currents such as electromagnetic starters, connectors, and relays.
The On Off Push Button Switches refers to a switch that pushes the transmission mechanism with a button to make the movable contact and the static contact open or close and realize circuit switching. It is a master control device with a simple structure and a wide range of applications. In the electrical automatic control circuit, used to manually send control signals to control connectors, relays, electromagnetic starters, etc.
This Pushbutton Switches is a kind of electric device that is used to switch on and off the small current circuit when the action is released. Generally used in AC and DC voltage below 440V, the current is less than 5A in the control circuit, generally do not directly manipulate the main circuit can also be used in the interconnection circuit. In actual use, in order to prevent desperation, different marks are usually made on the buttons or painted with different colors, and the colors are red, yellow, blue, white, black, green, and the like.
The Momentary Push Button Switch could be divided into metal push button switches and LED Light Switches and ordinary snap button type, mushroom head type, self-locking type, self-resetting type, rotary handle type, with indicator light type, lighted symbol type and key type, etc., with single button and double Buttons. Generally, it adopts a water-storage structure, which consists of a button cap, a return spring, a static contact, a moving contact and a casing. It is usually made into a composite type, and has a pair of normally closed contacts and normally open contacts, and some products can pass. The series connection of multiple elements increases the number of contact pairs. There is also a self-contained button that automatically holds the closed position when pressed, and can be turned on only after the power is turned off.
When the Metal Switches is not pressed, the movable contact is connected with the upper stationary contact. The pair of contacts is called a normally closed contact. At this point, the movable contact is disconnected from the following static contact. The pair of contacts is called a normally open contact: the button is pressed, the normally closed contact is open, the normally open contact is closed, and the button is released. Restore the original working state under the action of the return spring
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