Why can't wet fingers unlock? Uncovering the science behind smart locks.

Why can't wet fingers unlock? Uncovering the science behind smart locks.

Have you ever experienced an embarrassing moment like this? On a rainy day, when I came home with an umbrella and hastily closed the umbrella to open the door, I found that my wet fingers pressed repeatedly in the fingerprint identification area of  the digital door lock but did not respond... Or, because the fingerprints of the elders in the family are too shallow, they have to try repeatedly every time they open the door? These seemingly small troubles, but really affect the convenience of life. As the guardian of the entrance to the smart home, ZmartPlus knows the pain points of users, and today we reveal the science of electronic door locks fingerprint recognition, and tell you why our smart lock can make these troubles go away!

Science lesson of Fingerprint recognition: How can water molecules become "invisible jammers"?

The fingerprint recognition technology of modern home smart lock mainly relies on capacitive sensors or optical sensors. When you place your finger on the identification area:

- Capacitance sensor Builds 3D images by detecting charge differences between fingerprint ridges (ridges) and grooves (valleys);

- Optical sensor captures fingerprint contours by light reflection.

The jamming mechanism of wet finger is like a "signal jamming war" :

1. Water conduction effect: Water molecules form a conductive layer on the skin surface, blurring the charge difference between ridges and valleys (capacitive);

2. Light scattering phenomenon: liquid water changes the light path, resulting in fuzzy optical sensor imaging;

3. Epidermal swelling and deformation: The skin expands slightly after soaking in water, changing the original grain characteristics.

Sample Life scenario:

Imagine rain, sweat, or even metal particles on your finger after you've closed your umbrella on a rainy day, which together make it harder for the sensor to read a real fingerprint - which is why drying your finger instantly unlocks keyless door lock.

Second, the fingerprint dilemma of the elder: How do years "smooth" identity passwords?

We noticed that the average fingerprinting success rate of users over 65 years old dropped by 40%, which is behind three natural laws:

1. Thinning of the epidermis : loss of collagen leads to a reduction of about 30% in the depth of fingerprint lines;

2. cuticle sclerosis: long-term work or age increases the elasticity of fingerprints is reduced;

3. The metabolic cycle is slowed down ** : the skin renewal rate is reduced, and the fine wound is easy to form a grain break point after healing.

Typical Case :

Aunt Zhang was a textile worker when she was young, and years of exposure to yarn have smoothed her fingerprints. After Grandpa Li retired, he was keen on gardening, and long-term exposure to soil accelerated the degradation of fingerprints. The traditional fingerprint door lock is often unable to identify these "years of passwords".

Third, ZmartPlus game-breaking solution: three-mode biometrics to create non-inductive access

In response to these realistic pain points, we have made a breakthrough with the palmprint + face + fingerprint three-in-one recognition system, with a combination algorithm to achieve 99.98% recognition coverage: 

1. Palmprint recognition: Larger and more stable biometric keys.

- Capture the vein of the palm with 800x600 pixel HD camera

- The recognition area is 15 times larger than a fingerprint and contains 3,000 + feature points

- Especially suitable for: wet hands, wearing gardening gloves, wearing fingerprints

2. 3D structured light face recognition door lock: the future technology of looking up and opening.

- Using military-grade live detection technology, photos/videos cannot be cracked

-20℃ to 60℃ wide temperature range, accurate identification of rain, snow and fog days

- Intelligent height adaptation (1.2m-2m), children and the elderly can easily use

3. Self-learning fingerprint system: The smarter the AI algorithm.

- The fingerprint model is automatically optimized for each successful unlock

- Intelligent compensation for abnormal conditions such as dry cracking/peeling

- Supports 360° press identification at any Angle

4. Real Scene Experience: How does ZmartPlus reshape the way doors open.

- Rainstorm home: wet hand lightly sweep palmprint area, 0.8 seconds automatic unlock

- Supermarket purchase: When holding items, look up and the door lock opens immediately

- Elders visit relatives: Automatically record frequent visitor characteristics, parents no longer need to remember passwords

- Baby after school: Child safety mode automatically pushes door opening reminders to parents' mobile phones

5. The temperature of science and technology: customized for each family safe and convenient.

ZmartPlus aluminum door lock is not only a lock, but also a smart butler who understands life:

✅ Financial level security: Protects against Tesla coil/small black box attacks

✅Emergency power supply design: Type-C interface emergency charging, endurance anxiety zero

✅Personalized scenario mode: open the door and automatically light up, start security and other intelligent linkage 

Act now to unlock future life!

Purchase the ZmartPlus flagship Smart lock today and enjoy free on-site installation + 3-year warranty. Click on the official website to book an experience, and let technology gently guard every moment of going home.

"True intelligence is the ability to forget that technology exists." -- ZmartPlus product design concept

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