An Electromagnetic Lock Actuated by a Mobile Phone Equipped with a Self-Made Laser Pointer

Jau-Woei Perng,Tung-Li Hsieh

doi:10.3390/electronics8121524

Jau-Woei Perng, Tung-Li Hsieh

Open Access

https://doi.org/10.3390/electronics8121524

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Abstract

The main purpose of this study was to create an acousto-optic control lock device to convert electrical signals with a specific sound command using an acousto-optic conversion module, thereby improving the reliability and safety of opening or closing remote controlled door locks, such as car central locks or rolling doors. We used music playing through a smart phone speaker to create a special laser pointer to connect with the smart phone‘s auxiliary input. The laser pointer (wavelength of 630–650 nm and maximum output of 5 mw) lights up when the smart phone’s music starts playing at a music frequency matching the light frequency. When the solar panel receives light, it converts the frequency of the light signal into an electrical frequency signal. The current is amplified using the power amplifier and then the amplified current flows to the sound recognition module. The sound recognition module performs audio comparison on the set sound signal, and once the comparison is correct, the output voltage activates the electromagnetic switch on the door to open or close it.

Highlights

Traditional electronic remote controls [1,2] have been widely used in iron rolling doors, car central locks, scooter electronic locks, and various types of door locks
The proposed model is based on a control lock device: an audio-coupled, laser-actuated, electromagnetic lock device mounted on a door plank used to open or close the door using audio
The audio-coupled, laser-actuated, electromagnetic lock device consists of a transmitting unit, a composed of an acoustic receiver and an acousto-optic conversion module, and the receiving unit is receiving unit, a recognition unit, and an actuation unit

Summary

Introduction

Traditional electronic remote controls [1,2] have been widely used in iron rolling doors, car central locks, scooter electronic locks, and various types of door locks. Most remote controls use an infrared signal or a radio frequency (RF) signal [3,4,5] as the control signal to open or close the door. This requires the user to carry an additional device, which can be lost, stolen, or damaged . Electronic remote controls are susceptible to replication and theft, and their security is gradually being challenged. Such incidences cause inconvenience to the users of traditional remote controls

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