• Title/Summary/Keyword: LED sensor

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A Study on the Multi-sensor Toilet (다중센서 양변기에 관한 연구)

  • Lim, Jeong-Been;Park, Nam-Ki;Choi, Bo-Gyeom;Kim, Yeon-Koung;Kim, Jae-Wook
    • The Journal of the Korea institute of electronic communication sciences
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    • v.17 no.1
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    • pp.201-206
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    • 2022
  • In this paper, a flushing system with automatic opening and closing function of the toilet cover was studied. It works by an infrared sensor attached to the cover is detected or not. When the infrared sensor of the open function detects it, the servomotor is driven on the toilet cover to raise the cover, and when the infrared sensor with the close function detects the infrared sensor, the cover is set to be lowered. A tilt sensor is attached to the inside of the cover to operate when the cover goes down, and when this is activated, the servomotor connected to the toilet lever opens the stopper of the supply port and sends water down. In addition, we minimized the inconveniences for the next user when they use the toilet by using the non-contact water level sensor and LED function to notice the water is clogged during the flushing process. Also, we implemented UV-LED function to prevent bacterial growth while the toilet is closed.

A Study on Short-Range Wireless Communication System Development Using LED Based on Power Line Communication (전력선통신기반 LED를 이용한 단거리 무선통신 시스템 개발에 관한 연구)

  • Yun, Ji-Hun;Kim, Yong-Kab
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.3 no.1
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    • pp.19-23
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    • 2010
  • This study is to develop power line communication and short-range wireless communication system using LED. I will create optical receiver and transmitter using LED and optical sensor and connectors for display device and communication in receiver and transmitter were created. Experiment method is to signal and waveform through oscilloscope date from optical sensor after chosen a highly efficient LED. In addition, reception and transmitter of smoothly data using visible light communication program were checked. I will compliment problems through this experiment and constantly study, improve on power loss.

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An Efficient Control Sy7stem for Intelligent LED Indoor Lighting (지능형 LED 실내조명을 위한 효율적인 제어 시스템)

  • Hong, Sung-Il;Yoon, Su-Jeong;Lin, Chi-Ho
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.14 no.6
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    • pp.235-243
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    • 2014
  • In this paper, we propose an efficient control system for intelligent LED indoor lighting. The proposed an efficient control system for intelligent LED indoor lighting were included to elements such as daylight intensity measured through the PIR sensor and illuminance sensor at lighting style by the schedule defined and the occupancy detection. And it was controlled lighting through to the wireless sensor network, and was designed for the energy savings. Also, the lighting control of indoor lighting based on occupancy detection detect fine movements using a PIR sensor. And an unnecessary lighting intensity control of the window-side and the inside were controlled according to daylight level measurement result using the light sensor. In daylight inflow many case, the window-side lighting was to automatically darker, and in daylight inflow less case, was designed to be automatically bright. The efficiency validate results of an efficient control system for intelligent LED indoor lighting, the brightness of the indoor light were to maximize the energy saving by controlling in real time when entering as indoor a little that external lighting or daylight.

A Development of a LED Stand Using Illuminance Sensor for Efficient Energy Saving (효율적인 에너지 절감을 위한 센서 LED 스탠드 개발)

  • Chun, Sung-Yong;Shin, Ji-Yea;Park, Shin-Won;Yi, Hwa-Cho;Lee, Chan-Su
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.26 no.9
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    • pp.1-7
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    • 2012
  • In this paper, we present a new lighting control method considering ambient light in addition to the required lighting illumination for efficient energy saving of a LED stand. We estimate accurate environmental illuminance using a cheap illuminance sensor by modeling measured- and actual-illuminance using quadratic polynomial approximation. The relation between PWM(Pulse Width Modulation) duty ratio and illuminance intensity is modeled by a linear model. Illumination of the LED stand is controlled by estimating the difference of required illumination and the estimated ambient illumination. The developed LED stand has reduced electric energy consumption compared with a conventional manually controlled LED stand with the same lighting source. In addition, human subject evaluation shows that the LED stand, which is applied the proposed method, is more satisfactory than conventional ones since the proposed automatic controlled illumination produce more accurately required lighting and it is convenient.

Flicker Prevention and Noise Reduction Using Edge-Spike Modulation in Visible Light Communication

  • Lee, Seong-Ho
    • Journal of Sensor Science and Technology
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    • v.27 no.3
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    • pp.143-149
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    • 2018
  • In this paper, we introduce an edge-spike modulation method for visible light communication (VLC). This method is effective in preventing LED flicker and 120 Hz noise interference in base-band VLC. In the VLC transmitter, edge-spikes are generated by passing the digital data through a simple RC-high pass filter (HPF). The LED modulation of the edge-spikes does not change the average power of the LED light; thus it prevents LED flicker. In the VLC receiver, the 120 Hz noise from other lighting lamps is easily eliminated by RC-HPF, while the edge-spike signal is detected normally. In our experiment, the message of an air-quality sensor was successfully transmitted using edge-spike modulation. This structure is useful in constructing, e.g., wireless gas monitoring sensor systems to warn and prevent harmful gas leakage accidents in buildings using LED light.

Indoor Positioning System using LED Lights and a Dual Image Sensor

  • Moon, Myoung-geun;Choi, Su-il;Park, Jaehyung;Kim, Jin Young
    • Journal of the Optical Society of Korea
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    • v.19 no.6
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    • pp.586-591
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    • 2015
  • In recent years, along with the rapid development of LED technology, indoor positioning systems based on visible light communication (VLC) have been researched. In this paper, we propose an accurate indoor positioning method using white-light LEDs and a dual image sensor. Indoor LED lights are located at the ceiling in a room and broadcast information on their positions using VLC technology. A mobile device with a dual image sensor receives LED position information by VLC and estimates its position and azimuth angle. Simulation and experimental results are given to show the performance of the proposed indoor positioning system.

An Indoor Broadcasting System Using Light-Emitting Diode Lamps Coupled with Power Line

  • Lee, Seong-Ho
    • Journal of Sensor Science and Technology
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    • v.24 no.5
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    • pp.342-347
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    • 2015
  • We introduce an indoor broadcasting system using light-emitting diode (LED) lamps coupled with a 220 V power line. Two couplers connected to the power line constitute a power line communication (PLC) link. The transmission path from an LED lamp to a photodetector forms a visible light communication (VLC) link in free space. When the LED lamp is coupled to the power line, a composite PLC-VLC link is formed, making it possible to transmit a VLC signal beyond line-of-sight. In experiments, a 4 kHz analog signal modulated with a 100 kHz carrier was sent to the power line by a PLC coupler, and LED lamps coupled to the power line detected the signal and radiated it to multiple VLC receivers in the room. This configuration is useful in expanding an indoor VLC sensor network to adjacent rooms or constructing a voice broadcasting system in a building or apartments with existing power lines.

A Study on LED Lighting Control according to Sleep Stage using PPG Sensor of Wearable Device

  • Song, Jeong Sang;Kim, Tae Yeun;Bae, Sang Hyun
    • Journal of Integrative Natural Science
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    • v.12 no.1
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    • pp.9-13
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    • 2019
  • Recently, as the sleep disorder problem of modern people deepens, the interest towards quality of sleep is increasing. To increase the quality of modern people's sleep. This paper has suggested an LED lighting control system according to the sleep stage using PPG sensors of wearable devices. The pulse of the wrist radial artery was measured using a wearable device mounted with PPG sensor, which enables heart rate-measuring, and by using the point that heart rate lowers during stable sleep than non-sleeping, the LED lighting of indoors was controlled, which is the disturbing element when sleeping. For the performance evaluation, a 10-Fold cross analysis was conducted for performance evaluation, and a result of an average accuracy 87.02% was obtained as a result. Therefore, the LED lighting control system according to the sleep stage using a wearable device of this paper is expected to contribute to raise the quality of the user's life.

Natural Lighting Environment Implementation By Lighting Led with Color image Sensor (컬러 이미지 센서를 이용한 LED 조명 장치의 자연광 재현장치 구현)

  • Jang, Tae-Bok;Rhee, Sang-Burm
    • Journal of the Korea Computer Industry Society
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    • v.10 no.4
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    • pp.153-158
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    • 2009
  • This paper designed for natural lighting environment implementation with mixed color and white LED equipment. Lighting LED equipment Have a lot of advantage than traditional commercial lighting equipment. Such as high energy conversion efficiency and easy dimming control performance. This paper proposed LED lighting equipment with color sensor acquisition system can make best lighting environment for Human various kinds necessary.

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Fabrication of the Wafer Level Packaged LED Integrated Temperature Sensor and Configuration of The Compensation System for The LED's Optical Properties (온도센서가 집적된 WLP LED의 제작과 이를 통한 광 특성 보상 시스템의 구현)

  • Kang, In-Ku;Kim, Jin-Kwan;Lee, Hee-Chul
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.49 no.7
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    • pp.1-9
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    • 2012
  • In this paper, resistance temperature detector (RTD) integrated into the LED package is proposed in order to solve the temperature dependence of LED's optical properties. To measure the package temperature in real time, the RTD type temperature sensor having excellent accuracy and linearity between temperature change and resistance change was adopted. A stable metallic film is required for long term reliability and stability of the RTD type temperature sensor. Therefore, deposition and annealing condition for the film were determined. Based on the determined condition, the RTD type temperature sensor with the sensitivity of about $1.560{\Omega}/^{\circ}C$ was fabricated inside the LED package. In order to configurate the LED package system keeping the constant brightness regardless of the temperature, additional conversion circuit and control circuit boards were fabricated and added to the fabricated LED package. The proposed system was designed to compensate the light intensity caused by temperature change using the variable duty rate of driving current. As a result, the duty rate of PWM signal which is the output signal of the configurated system was changed with the temperature change, and the duty rate was similarly varied with the target duty rate. Consequently, it was focused the fabricated RTD can be used for compensating the optical properties of LED and the LED package which exhibits constant brightness regardless of the temperature change.