The smart door lock was opened in seconds by the Tesla coil. Is there any way to solve this problem?

eric_wang

The smart door lock was opened in seconds by the Tesla coil. Is there any way to solve this problem? [Copy link]

 

I just watched the video shared by @ljj3166 showing how a Tesla coil can open a smart lock in seconds. It was so scary, it basically opens in seconds. The video is as follows In order to verify it, I searched the Internet for an explanation about the Tesla coil: The Tesla coil is also called the Tesla coil. It is a distributed parameter high-frequency series resonant transformer that can obtain a high-frequency voltage of millions of volts. The principle of the traditional Tesla coil is to use a transformer to boost the normal voltage, and then charge the primary LC loop resonant capacitor. When it is charged to the discharge threshold, the spark gap discharge is turned on, and the primary LC loop resonates in series, providing a sufficiently high excitation power to the secondary coil. Secondly, the frequency is equal to that of the secondary LC loop, so that the inductance of the secondary coil and the distributed capacitance resonate in series. At this time, the discharge terminal voltage is the highest, so lightning is seen. In layman's terms, it is an artificial lightning maker.

So why can the Tesla coil crack the smart lock? Some people say that the strong electromagnetic pulse generated by the Tesla coil attacks the smart lock chip, causing the chip to freeze and restart, while some smart locks automatically unlock after restarting by default, so the Tesla coil can open the smart lock in seconds.

Although this incident only happened to a few brands of door locks and cannot represent all, the existence of this problem does make merchants who want to buy smart door locks or sell locks break out in a cold sweat.

Why do smart locks have such problems? Is it due to cost issues or cutting corners? Or is it a core program design flaw? For this problem, in addition to changing the lock, do you have any quick and effective solution?

okhxyyo

It's really scary that it opens in seconds~~ Personally, I feel that mechanical locks are safer.

ljj3166

The threshold is too low, the product is bad, and the characteristics of China are helpless

eric_wang

okhxyyo posted on 2018-7-17 14:44 It is really scary to open in seconds~~ I personally feel that mechanical locks are safer.

In fact, door locks are designed to prevent gentlemen but not villains. I feel that if we want to be safe now, door locks must be equipped with surveillance cameras, so that even if a bad guy breaks into the door, the camera can deter him and we can also have his image, which is helpful for solving the case quickly.

eric_wang

ljj3166 Published on 2018-7-17 14:53 The threshold is too low, the products are lousy, and the characteristics of China are helpless

From the side, we can also see that China's manufacturing is developing rapidly. In just a few years, various brands of smart door locks have emerged. Although some of the products are lousy

AOE-hill

Millions of volts? What does that mean?

maychang

eric_wang posted on 2018-7-17 15:09 From the side, we can also see that China's manufacturing industry has developed rapidly. In just a few years, various brands of smart door locks have emerged, although some of the products are bad

These products are indeed bad. I think of a simple reason: the so-called "smart door lock" must use a CPU (most likely a single-chip microcomputer). When the CPU is strongly interfered with, the program may "run away". After the program "runs away", it is usually a watchdog action, and the single-chip microcomputer is reset and restarted. The simple single-chip microcomputer system is generally in the default initial state after reset and restart, waiting for the password or fingerprint to be entered or... Obviously, the lock tongue must be in the open state at this time, otherwise there is no way to set a digital password or fingerprint password for the "smart door lock" after leaving the factory. Prevention methods: Strengthen electromagnetic shielding, strengthen CPU input and output filtering, ensure that strong interference cannot reach the CPU, set up multiple CPU status backups, check multiple CPU status backups when restarting, choose two out of three or three out of five, and enter the specified program after meeting the requirements...

maychang

AOE-hill posted on 2018-7-17 15:19 Millions of volts? What is that?

Millions of volts is an exaggeration.

maychang

eric_wang posted on 2018-7-17 15:09 From the side, we can also see that China's manufacturing industry has developed rapidly. In just a few years, various brands of smart door locks have emerged, although some products are bad

"Smart door locks" are civilian products. If it is an industrial product, the program will "run away" after being disturbed, and the actuator will act randomly, which is fatal. For example, when an excavator executes a bucket opening program during movement, dozens of tons of ore or soil will fall on people's heads...

maychang

eric_wang posted on 2018-7-17 15:09 From the side, we can also see that China's manufacturing industry has developed rapidly. In just a few years, various brands of smart door locks have emerged, although some of the products are bad

There was a rear-end collision accident on China's high-speed rail. The control system was originally designed to never rear-end collisions. The brakes would be applied when the distance was close. However, due to system incompatibility, the rear-end collision occurred after being interfered with.

eric_wang

maychang posted on 2018-7-17 15:35 There was a rear-end collision accident on China's high-speed rail. The control system was designed to prevent rear-end collisions. The brakes would be applied if the distance was too close. However, due to the system...

This is quite scary

eric_wang

maychang posted on 2018-7-17 15:27 These products are really bad. I can think of a simple reason: the so-called "smart door lock" must use a CPU (most likely a single-chip microcomputer). And the CPU is...

Now no matter what is done, it will come out in a short period of time, and the result is that various problems like this will occur. I just checked a few related news. Generally speaking, the main problem is the cost. You sell cheaply, and I sell cheaper than you. This cheapness comes at a price.

maychang

eric_wang posted on 2018-7-17 15:43 Nowadays, no matter what you do, you will come out in a short period of time, and the result is that various problems like this will occur. I just checked a few related news, and generally...

Electric lights had just been invented and entered thousands of households, so fires occurred frequently, and even J.P. Morgan's desk was burned. Insurance companies were in a big trouble because many houses that were hit by electrical fires were insured for fire, and insurance companies had to pay claims when fires occurred. So many insurance companies set up a laboratory. If the electrical appliances that were not tested and qualified by this laboratory were tested and qualified by the laboratory, they would be compensated in case of fire. This laboratory is the UL laboratory, which still exists today and is one of the most reputable laboratories in the world. For products with UL laboratory qualified seal, dealers and users can rest assured, and the price will be higher than that of products that have not been tested and qualified by UL laboratory. The power supply of your PC may have the seal of UL laboratory.

eric_wang

maychang posted on 2018-7-17 16:06 When the electric light was just invented and entered thousands of households, fires occurred frequently, and even J.P. Morgan's desk was burned. Insurance companies were in a big trouble, ...

I remember seeing this logo before. So this is what it is. I learned something new.

lcn1992

The domestic market is like this. We also make smart locks. The boss requires us to build them from scratch in one month, and compress the hardware to the cheapest solution. What kind of product can we produce if we want it to be fast and cheap?

wsmysyn

Looks pretty scary.

eric_wang

lcn1992 posted on 2018-7-17 16:42 The domestic market is like this. We also make smart locks. The boss requires 1 month from scratch, and the hardware is compressed to the cheapest solution. What can be done fast and cheap...

Show this video to the boss

AOE-hill

lcn1992 posted on 2018-7-17 16:42 The domestic market is like this. We also make smart locks. The boss requires one month from scratch, and the hardware is compressed to the cheapest solution. What can be done if it is fast and cheap...

Slow work produces fine work. How many people in China can do it? If you don’t produce a product today, you will be out tomorrow. What about the day after tomorrow? If you can’t keep up with the pace, maybe the product will be eliminated by the market and peers before it is developed. Therefore, many people are just trying to make a quick buck. As for those who should go bankrupt, those who should go public will go public, and those who should be century-old stores will be rare.

maoshen

Intelligence and new energy are just concepts,,,,,,,,,,,,, generally those who take them seriously are basically newbies

hk6108

If it is military or aerospace equipment, it will be terrible! Since resetting can cause unlocking, it means that the electromagnetic pulse is not strong enough to directly destroy the circuit like a nuclear weapon, but it is still enough to cause errors! ?