Is the so-called "real operation verification ofo smart lock" real? Senior hardware engineer has something to say!

This article first appeared on the WeChat public number: the heart of the stone. The content of the article belongs to the author's personal opinion and does not represent the position of Hexun.com. Investors should act accordingly, at their own risk.

The battle between shared bikes has never stopped. When Ma Huateng and Zhu Xiaohu's circle of friends shared the advantages and disadvantages of bicycle smart locks, a so-called "programmer" article that dismantled the ofo smart locks appeared on the Internet. The final conclusion of this article is: ofo's smart lock structure is simple, the battery is a one-time non-rechargeable product, the CPU model can not be found, the positioning depends on the operator base station, so the ofo smart lock is cheap and unreliable.

Seeing this article by the so-called programmers evaluating theo lock, my first reaction was that "this act of encroaching and destroying the private property of others is illegal." If you buy a mobile phone yourself, write an article after dismantling, this is ok. But now you are carrying a violent dismantling of a shared bicycle that is not your own. It is only law blind or driven by some kind of interest to do this stupid thing. Since the media is a real name system, ofo can completely arrest people by alarm.

In addition to breaking the law, I specifically asked a senior hardware engineer for the technical issues involved in this article to come up with the following observations:

First of all, can the screwdriver open the ofo smart lock? According to senior hardware engineers, this type of lock is generally ultrasonically welded to completely fuse the molecular layers between the welds. Simply put, the two objects are integrated and cannot be knocked on with a screwdriver unless they are cut or broken with a tool. From the disassembled picture of the programmer, the firmware connection has been destroyed.

(Look carefully that the perimeter has been broken)

Therefore, at the end of the text, it is said that the disassembled ofo smart lock will be restored. This is absolutely impossible to recover. And the author did not show his restored photos. How can I receive the unlock password after the damaged lock?

Secondly, is the structure simple or not? The programmer said: "The structure inside is very simple, an antenna, Mini-USB, communication module and a Unicom USIM card."

Senior hardware engineers say that as a lock on a bicycle, its use environment is very harsh, and electronic devices are mostly fragile devices. Therefore, only a simple structure can improve durability. If the structure and wiring are complicated, reliability will be affected. The fault cannot be unlocked.

I also found an introduction on the Mobai smart lock on the Internet: "Mobay smart lock circuit design is complex, many leads need to walk inside the riser and under the shaft, the assembly cost is high, and the reliability and durability It is also reduced because of the complexity of the structure and design."

Again, whether the smart lock battery is a disposable battery or a rechargeable battery. This article claims that ofo's smart lock uses "a button battery and a devout CR17450 lithium manganese battery (LMO) battery." Moreover, the author believes that the price of lithium manganese battery (LMO) batteries is low, the temperature range is poor, and the data given is -20 to 45 degrees Celsius.

However, a senior hardware engineer told me that a lithium manganese battery (LMO) battery is a high-performance industrial battery with extremely high stability and a self-discharge rate as low as 2% per year. Even after long-term discharge, it maintains a stable operating voltage. The reliability of the electrical appliance is greatly improved, and the electrical appliance is maintenance-free (substantially no need to replace the battery).

Moreover, the lithium manganese battery (LMO) battery has a special process and formulation to meet the operating temperature requirements of -40 to 80 °C. The ofo smart lock is disassembled and displayed. Its battery model is CR17450. From the technical documents, the battery operates at -30 to 75 degrees Celsius instead of -20 to 45 degrees Celsius.

Therefore, the use of lithium-manganese battery (LMO) batteries ensures that the smart lock can be operated at very low and extremely high temperatures without replacing the battery for 2 years, saving costs and improving reliability.

Then look at the power supply system of the Mobility Smart Lock. I found an analysis on the Internet. The analysis said that "Mobay's battery is a rechargeable battery. The first generation uses TI's BQ25895 charging chip. It supports up to 5A fast charging and can support the high-voltage input of the power generating drum. But it is worth It is mentioned that this film can only support 14V at most. If the ride speed is fast, the output voltage of the power generating drum can easily exceed this value, so they add a first-level rectification and voltage stabilization circuit after the power generation drum. Inside the tube.

However, this design is obviously costly, and the film claims to support 5A fast charging, but it requires a strong system design and a good cooling solution. However, the heat dissipation design inside the Mobai smart lock has not been seen. If the 5A fast charge is continued, it will cause overheating, the current will decrease and there will be safety hazards. ”

Whether it is through power generation drums or second-generation solar panels, it is necessary to have circuits connected to the locks. On the Mobai lite, the solar panels are placed at the bottom of the frame, which is made of silicon, like glass. It will be broken by the impact, even if the screws of the fixed plate are tightened. Once the line fails or the battery board is broken, it is no longer possible to power the smart lock battery.

The 5800 mAh lithium battery used by Mobility Smart Lock has a standby time of only 3-6 months. Once it cannot be recharged, it means the car lock cannot be opened. Therefore, from the perspective of cost, durability and reliability, the design of Mobility Smart Lock has no obvious advantage compared with ofo smart lock.

Fourth, the communication chip used by theo smart lock is to eliminate the goods? This article said "the board B side found the QuectelM26 module, it is a GSM / GPRS chip, but in the Quectel official website did not find M26 information, so it is eliminated chips." And as an engineer, you should learn to view Find the hardware model that suits your hardware manufacturer's website.

He kept saying that there is no M26 information on the official website. How can I find it? Open Quectel's official website, click on products and services, find 2G IoT modules, the third product is M26. And there are detailed performance introductions:

The M26 is the world's smallest quad-band LCC-packaged GSM/GPRS module. It is especially suitable for automated, large-scale, low-cost modern production methods. It relies on ultra-small size, ultra-low power consumption and wide operating temperature range, suitable for in-vehicle, wearable, industrial M2M applications such as PDA, personal tracking, wireless POS, smart metering, etc., provide complete SMS, data transmission and voice services.

In addition, the advantages of using GSM/GPRS for positioning are low cost and low power consumption. At present, there are very few cases of finding a car by positioning. When there are enough shared bicycles, it is more troublesome to ride. The positioning of GPRS can penetrate into the room, so even if the vehicle is stolen, it can be retrieved, and the GPS completely fails indoors. Ando new smart lock has already supported GPRS and Beidou dual positioning.

Now the world's smallest GSM/GPRS module has been called the “elimination” product by the media. This article has been released on the whole network, and the reading volume is amazing. This not only hurts the brand reputation of theo, but also hurts. The brand reputation of Quectel, a technology company, is recommended to sue the self-media.

At present, the shared bicycles are fighting fiercely, and all kinds of fake news are flying all over the sky, making people really difficult to distinguish. I am a very real person, so I dig deep into the loopholes of the next article so that readers are not misled.

So, why did Zhu Xiaohu say "watching data after one year"? We will return to the circle of friends between Ma Huateng and Zhu Xiaohu. Ma Huateng believes that the lock of ofo is not intelligent enough. Zhu Xiaohu believes that "the best value for money is a good solution" "see data after one year."

I think that the view of Zhu Xiaohu, the investment in the Jinsha River as the investor of ofo, is different from that of Ma Huateng. The main reason lies in the different roles of the two. Mobai's tencent is nothing but a very small project among many investment projects. The success or failure of Mobai is almost zero for Tencent.

For the Jinshajiang investment, which focuses on the early investment of startups, ofo is its most important project. The success or failure is of great significance. Therefore, Tencent can not pay too much attention to some elements of competition, such as scale, cost and return, but Zhu Xiaohu must Be very concerned about these.

And the first priority of sharing bicycles is to fight the scale and the cost of getting customers. The cost of the ofo smart lock, solid tire version is about 500 yuan, and Moby is at least 1,800 yuan. This means that the cost of the app for Mobye is three times that of the ofo. 1 Moby can buy 3 ofo, even if you lose 1 vehicle, there are 2 left, the total is still more than Moby.

This is why on the streets of Beijing, you will find that the number of ofo is definitely more than the main reason for Moby. Moreover, the data from the three organizations of iResearch, Analysys International and DCCI can also see that the number of users of ofo is much higher than that of Moby.

After 1 year, aso also gradually smart locks and smart locks for GPS and Beidou navigation modules, and users become more and more civilized, and the damage and loss rate of ofo will be reduced. At the same time, complex smart lock design, complex circuits, and rechargeable batteries may cause a large number of smart locks of Moby to fail after one year, while theo locks can be used for two years without maintenance. Therefore, Zhu Xiaohu said that "seeing data after one year" makes sense.

There is no profit model for shared bicycles. Only by focusing on the scale, the number of APP registered users is the biggest barrier. This is also the thing that investors must put in the first place for consideration.

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