Smartphone-Driven Low-Power Light-Emitting Device.

Hea-Ja An,Kyung-Won Kim,Han-Yeong Oh,Mun-Ho Ryu,Kyoung-Jun Park,Nam-Gyun Kim

doi:10.1155/2017/5076965

Hea-Ja An, Kyung-Won Kim + Show 4 more

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https://doi.org/10.1155/2017/5076965

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Abstract

Low-level light (laser) therapy (LLLT) has been widely researched in the recent past. Existing LLLT studies were performed based on laser. Recently, studies using LED have increased. This study presents a smartphone-driven low-power light-emitting device for use in colour therapy as an alternative medicine. The device consists of a control unit and a colour probe. The device is powered by and communicates with a smartphone using USB On-The-Go (OTG) technology. The control unit controls emitting time and intensity of illumination with the configuration value of a smartphone application. Intensity is controlled by pulse width modulation (PWM) without feedback. A calibration is performed to resolve a drawback of no feedback. To calibrate, intensity is measured in every 10 percent PWM output. PWM value is linearly calibrated to obtain accurate intensity. The device can control the intensity of illumination, and so, it can find application in varied scenarios.

Highlights

Low-level light therapy (LLLT), a kind of colour therapy, has been widely studied
This study presents a mobile level light (laser) therapy (LLLT) device controlled by a smartphone using Universal Serial Bus (USB) On-The-Go (OTG)
The standard deviation on 100% pulse width modulation (PWM) is decreased from 0.01 mW to 0.0012 mW

Summary

Introduction

Low-level light (laser) therapy (LLLT), a kind of colour therapy, has been widely studied. LLLT has clinical applications with low-emitting laser or light-emitting diode (LED). Effects of LLLT are shown in molecular, cellular, and tissue levels. It has positive effects to promote healing and to relieve some pain or inflammation. The biological basis mechanism of LLLT is not clear. It is thought that red or near infrared (NIR) light is absorbed by mitochondrial chromophores and by photoreceptors in the plasma membrane of the cells. Many studies have assumed that some biological action is caused by subsequent reactions after that [1]

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