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Battery-free NFC Lock

A feasible & commercialized smart lock solution that unlocks via NFC-enabled smartphones, no built-in battery required.

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The finished Tag Emulator serves as a core component for battery-free NFC lock solutions. Leveraging passive NFC energy harvesting technology, it supports secure, wire-free unlocking operations, making it ideal for low-power, maintenance-free access control scenarios.

Two publicly available analogous product solutions have been discovered for reference:
1. https://www.holtek.com/page/applications/detail/WAS-2331
The proposed approach employs a combination of a dual-interface NFC chip and a low-power consumption MCU, where an extra group of antennas is utilized to capture energy for driving the motor.
2. https://www.infineon.com/part/NAC1080
This solution boasts high integration, implementing all functions on a single chip. Unfortunately, the chip in question has been discontinued.

This solution leverages the CW32L010 to implement NFC communication, eliminating the need for a dedicated NFC chip and resulting in extremely low costs.

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Per Jensen wrote a day ago point

Project title is mis-spelled. *Battery :)

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MCUer wrote 12 hours ago point

Thank you for your reminder.

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