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Article

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

by 1 and 1,2,*
1
Department of Mechanical and Electromechanical Engineering, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
2
General Education Center of Wenzao Ursuline University of Languages, Wenzao Ursuline University, Kaohsiung 80793, Taiwan
*
Author to whom correspondence should be addressed.
Electronics 2019, 8(12), 1524; https://doi.org/10.3390/electronics8121524
Received: 26 October 2019 / Revised: 6 December 2019 / Accepted: 10 December 2019 / Published: 11 December 2019
(This article belongs to the Special Issue Intelligent Electronic Devices)
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. View Full-Text
Keywords: laser pointer; electromagnetic lock; sound recognition module laser pointer; electromagnetic lock; sound recognition module
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MDPI and ACS Style

Perng, J.-W.; Hsieh, T.-L. An Electromagnetic Lock Actuated by a Mobile Phone Equipped with a Self-Made Laser Pointer. Electronics 2019, 8, 1524. https://doi.org/10.3390/electronics8121524

AMA Style

Perng J-W, Hsieh T-L. An Electromagnetic Lock Actuated by a Mobile Phone Equipped with a Self-Made Laser Pointer. Electronics. 2019; 8(12):1524. https://doi.org/10.3390/electronics8121524

Chicago/Turabian Style

Perng, Jau-Woei, and Tung-Li Hsieh. 2019. "An Electromagnetic Lock Actuated by a Mobile Phone Equipped with a Self-Made Laser Pointer" Electronics 8, no. 12: 1524. https://doi.org/10.3390/electronics8121524

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