How does Tesla coil unlock the biometric fingerprint door lock from buzai232's blog

How does Tesla coil unlock the biometric fingerprint door lock

Recently, there have been media reports that a small black box on the market has spread. Take this small black box and shake it in front of the biometric fingerprint door lock door lock. Fingerprints and NFC cards are no longer needed, and the door opens automatically, and the whole process takes no more than 5 seconds.To get more news about smart door lock manufacturers, you can visit securamsys.com official website.

This news caused panic among many people. Is the smart lock loophole so big not long after the family has just changed? Is the smart lock really safer than the original mechanical lock? Today, Lao Yang will talk about this with everyone.

What is the sacred "little black box"?

The cause of the incident was that a woman surnamed Wang went to a door industry exhibition site to "kick the hall" and opened eight smart door locks of different brands on the spot with a small self-made black box.This small black box does not look complicated. There is the only switch button on the box body, and the rest is a copper coil that looks like an old mosquito coil. The scientific name of this thing is called Tesla coil.

However, this Tesla has nothing to do with the Tesla electric car. It was invented by a Serbian-American scientist Nikola Tesla, and was naturally named after this scientist.The structure of the Tesla coil is actually very simple, the main components are a transformer and a discharge device.

The transformer can convert the low voltage in the battery into a higher voltage. For the specific principle, you can go back and look through the physics book of yourself or your child's junior high school. The discharge device is used to make artificial lightning.

That's right, this thing was only circulated among a small group of fans. When the top discharge device is close to another metal, because the amplified voltage is raised to a high level, the air in the middle will be ionized to form a visible electric spark, which is artificial lightning.
Many people we watched in science and technology museums and other places fired lightning directly, in fact, they used similar principles. It's just that they wear insulating gloves on their hands, and the metal device outside the gloves acts as a conductor. The electricity will also be grounded along the wire, so that it will not cause harm to the human body.

The small black box cancels the discharge device, and the voltage increase is relatively limited, so it does not directly generate electric sparks, but the voltage increase is the key to the small black box.

Here, we have to introduce a concept of high school physics: electric potential energy. In fact, voltage is a manifestation of the difference in potential energy between two grounds, and if a conductor is connected to two grounds with different potential energy, then current will be generated.Why can a small black box or Tesla coil make a fluorescent lamp that is not connected to the power supply glow?

Ordinary fluorescent lamps connected to the power supply are stimulated by the high voltage formed by the ballast, the inert gas in the tube will ionize to form a current, and different conductors will have a certain energy loss in the current transmission, such as electric heaters, electric heating The conductor energizes and generates heat, while the fluorescent lamp emits light。

When the Tesla coil approaches, it replaces the ballast and directly provides the high voltage for ionization.Although the internal structure of the smart keyless door lock is complicated, it is also affected by high voltage. When the voltage rises, when the remote potential energy standard is set to 0, the potential energy of the small black box can be regarded as a very large value.

When the smart lock enters the electric potential of the small black box, the internally balanced electric potential will also be broken. In an environment where the potential is high and low, the smart lock circuit and the chip provide a conductor, so current is also generated.

Since most chips have over-voltage protection, when the internal current is detected to be abnormal, the power will be cut off and then restarted. Many smart door locks restart by default in the open state, which results in the small black box opening the door.

Another possibility is that the current stimulated the operation of the motor, causing it to directly drive the anti-theft bolt to withdraw, and bypass the identification stage.In other words, if you catch up with thunder and rain, if a bolt of lightning hits your door lock, it may open the door directly.

Is this a bug in the smart lock industry?

This can be regarded as a problem faced by all electronics industries, but in actual use, almost no one will directly interfere with a Tesla electric circle everywhere, so this problem is generally not solved.And when it comes to locks, which are designed to be safe, the solution to this BUG must be launched.

In fact, the principle is not difficult. Use a metal shell to wrap the entire electronic part of the lock to form an electromagnetic shield to prevent interference from external potential energy, or add a stable voltage module to the circuit design.