Apparatus chromaticity control

2021 ◽  
Author(s):  
Keyword(s):  
Flash Memory ◽  
Optical Radiation ◽  
Humidity Sensor ◽  
Light Emitting Diode ◽  
Digital Signal ◽  
Light Emitting ◽  
Lighting Device ◽  
Temperature And Humidity ◽  
Avr Microcontroller

The article is devoted to the development of a lighting apparatus with chromaticity control of the LED strip depending on the temperature and humidity. To develop a prototype of a lighting installation, an A-Star 32U4 Micromicrocontroller (analogous to ArduinoMicro) and a DHT11 temperature and humidity sensor are used. The A-Star 32U4 Micro microcontroller is a universal programmable module based on the ATmega32U4 AVR microcontroller from Microchip (formerly Atmel) which has 32 KB flash memory, 2.5 KB RAM and built-in USB functionality. Keywords optical radiation; light-emitting diode; LED strip; lighting device; chromaticity; temperature; humidity; thermistor; sensor; microcontroller; chip; digital signal

COLOR CONTROL OF THE DEVICE WITH LED TAPE ON THE VALUE OF TEMPERATURE AND HUMIDITY OF AIR

2021 ◽  
pp. 53-56
Author(s):  
O. Yu. Kovalenko ◽  
M. D. Rybko ◽  
S. A. Mikaeva ◽  
Yu. A. Zhuravleva
Keyword(s):  
High Temperatures ◽  
Power Supply ◽  
Flash Memory ◽  
Humidity Sensor ◽  
Voltage Regulator ◽  
Lighting Device ◽  
Temperature And Humidity ◽  
Color Control ◽  
Avr Microcontroller

The work is devoted to the development of a lighting device with control of the color of the LED strip depending on the value of temperature and humidity. To develop a prototype of a lighting installation, an A-Star 32U4 Micro microcontroller (analogue of Arduino Micro), 2 pieces of RGB tape of 5 and 10 cm each, a DHT11 temperature and humidity sensor, connecting wires, a case were purchased. The A-Star 32U4 Micro microcontroller used in the proposed setup is a universal programmable module based on the ATmega32U4 AVR microcontroller from Microchip (formerly Atmel), which has 32KB flash memory, 2.5KB RAM, and builtin USB functionality. A voltage regulator and power selection circuitry allows the board to be powered from either USB or an external 5.5V to 15V supply, while a resettable PTC fuse on the USB VBUS power supply and reverse protection on the VIN help protect it from accidental damage. In the course of the work, studies were carried out on the operation of the installation under normal conditions and at low and high temperatures.

Temperature and Humidity Dependent Reliability Analysis of RGB LED Chips

2006 ◽  
Author(s):  
Jun-Xian Fu ◽  
Shukri Souri ◽  
James S. Harris
Keyword(s):  
Reliability Analysis ◽  
Printed Circuit Board ◽  
Light Emitting Diode ◽  
Circuit Board ◽  
Light Emitting ◽  
Printed Circuit ◽  
Root Cause ◽  
Micro Cracks ◽  
Temperature And Humidity

Abstract Temperature and humidity dependent reliability analysis was performed based on a case study involving an indicator printed-circuit board with surface-mounted multiple-die red, green and blue light-emitting diode chips. Reported intermittent failures were investigated and the root cause was attributed to a non-optimized reflow process that resulted in micro-cracks and delaminations within the molding resin of the chips.

Experimental study of humidity control methods in a light-emitting diode (LED) lighting device

2015 ◽  
Vol 29 (6) ◽  
pp. 2501-2508 ◽  
Author(s):  
Chul-Sook Kim ◽  
Jin-Gyu Lee ◽  
Ji-Hyun Cho ◽  
Dong-Yeon Kim ◽  
Tae-Beom Seo
Keyword(s):  
Experimental Study ◽  
Light Emitting Diode ◽  
Control Methods ◽  
Humidity Control ◽  
Light Emitting ◽  
Led Lighting ◽  
Lighting Device

scholarly journals Realization of a Secure Visible Light Communication System via Chaos Synchronization

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Teh-Lu Liao ◽  
Chih-Yung Chen ◽  
Hsin-Chieh Chen ◽  
Yung-Yi Chen ◽  
Yi-You Hou
Keyword(s):  
Visible Light ◽  
Light Transmission ◽  
Light Emitting Diode ◽  
Digital Signal ◽  
Visible Light Communication ◽  
Audio Signals ◽  
Light Emitting ◽  
Straight Line ◽  
Data Transmission Security ◽  
To Receive

A novel technique for transmission of information through visible light communication (VLC) is developed in this study. A light-emitting diode is used as the light source at the transmitting side to send the encrypted information. At the receiving side, a light sensor, OPT-101, is used to receive the light signals that carry the encrypted information. The Arduino Due microcontroller board is used for digital signal processing at both the transmitting and receiving sides. Furthermore, to prevent the transmitted message from being intercepted, two chaotic systems, a master and a slave, with a synchronization controller are designed to obtain the transmitted audio signals. The design enables not only a VLC system with the light transmission path as a straight line (so that data cannot be stolen) but also the encryption of the audio signals with the chaotic system (Rössler system) to enhance data transmission security. The effectiveness of this system is then experimentally verified.

scholarly journals Design and Development of Temperature and Humidity Monitoring System

2019 ◽  
Author(s):  
R N Sonawane ◽  
A S Ghule ◽  
A P Bowlekar ◽  
A H Zakane
Keyword(s):  
Monitoring System ◽  
Printed Circuit Board ◽  
Liquid Crystal Display ◽  
Light Emitting Diode ◽  
Field Testing ◽  
Circuit Board ◽  
Light Emitting ◽  
Temperature And Humidity ◽  
Sd Card ◽  
Humidity Monitoring

The temperature and humidity monitoring system was developed using various components viz., Arduino Uno, DHT11 sensor, universal serial bus (USB) type B cable, adaptor, DC power jack, 9-V battery connector, 9-V DC battery, resistor, liquid-crystal display (LCD) screen, trimmer potentiometer, light-emitting diode (LED) bulbs, jumper wires, micro secure digital (SD) card module, printed circuit board (PCB), etc. The field testing of the developed temperature and humidity monitoring system was carried out at various locations of the college campus. It was observed that the system worked between the percent variation of 0–8.00% for temperature and 0–5.97% for humidity. The developed system showed the accuracy of ±2°C for temperature and ±4% for humidity. The total cost incurred for the development of temperature and humidity monitoring system along with all accessories was ₹1625.

scholarly journals A Novel Heat Sink Design and Prototyping for LED Desk Lamps

2015 ◽  
Vol 2015 ◽  
pp. 1-8
Author(s):  
Li-Ming Chu ◽  
Wei-Chin Chang ◽  
Ting Hsuan Huang
Keyword(s):  
Heat Sink ◽  
Light Emitting Diode ◽  
Base Plate ◽  
Life Time ◽  
Heat Sinks ◽  
Light Emitting ◽  
Lighting Device ◽  
Different Types ◽  
Heat Sink Design ◽  
Chimney Effect

Light-emitting diode (LED) is a modern lighting device. If the heat dissipating mechanism of LED desk lamp is not well designed, the induced high temperature will cause the reduction of illumination and life time of lamp. Therefore, the heat sink design becomes a key technology for LED lighting device. This study developed a methodology to design and analyze a heat sink for LED cooling. Four different types of heat sinks with fins in longitudinal or transverse directions and with or without vents on the base plate were compared. By using the CFD software FLUENT, heat flux and temperature around the heat sink were analyzed, and the surface temperature distribution was also investigated. The simulation outcomes were compared with experiments results to verify analysis accuracy. The comparisons show only slight differences, and the deviations were less than 4.0%. For cooling LED desk lamp, the design of using 12 vents on both sides of heat sink through natural convection to create the chimney effect was adopted; consequently, the temperature dropped 5°C in average. This design can also reduce the material of heat sink, LED lamp weight, and production cost.

Modeling and Simulation of LED Manufacturing Process with ExtendSim

2011 ◽  
Vol 109 ◽  
pp. 494-498
Author(s):  
Yin Hui Ao ◽  
Zhen Xin Wu
Keyword(s):  
Modeling And Simulation ◽  
Manufacturing Process ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
Led Light ◽  
Lighting Device ◽  
Processing Line

LED (Light Emitting Diode) has many excellent features as a new lighting device, and has been widely used by far. The structure and light-emitting principle are introduced. The LED manufacturing process is explained and dynamically shown with FLASH CS. The processing line is modeled and simulated through dynamics software ExtendSim. The simulation result is analyzed and the processing line is balanced. The throughput is improved with the simulation.

scholarly journals Soft, Wirelessly Powered Humidity Sensor Based on SnO2 Nanowires for Wireless/Wearable Sensor Application

Materials ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2176 ◽  
Author(s):  
Gunchul Shin
Keyword(s):  
Electrical Properties ◽  
Humidity Sensor ◽  
Light Emitting Diode ◽  
Chemical Vapor ◽  
Polymer Substrate ◽  
Light Emitting ◽  
Sno2 Nanowires ◽  
Transfer Method ◽  
Soft Polymer ◽  
Response To Water

Humidity, along with temperature, is one of the most important environmental variables in people’s lives. The control of humidity is an important matter that is related to material properties and stability in various industries, as well as basic living. In order to detect humidity, changes in the physical, chemical, and electrical properties of materials related to humidity are used, and studies using various methods are conducted. In this study, a field-effect transistor (FET) device was fabricated on a soft polymer substrate with SnO2 nanowires (NWs), whose electrical properties change in response to water molecules. The SnO2 NWs, synthesized by chemical vapor deposition (CVD), were transferred onto a polymer substrate, using a sliding transfer method. The NW FET device, which was connected to an aluminum (Al)-based radio frequency (RF) receiving antenna, was wirelessly operated as a humidity sensor, based on the change in electrical properties of SnO2 NWs according to the relative humidity (RH). It was configured with a wireless antenna and light emitting diode (LED) indicator to implement a soft wirelessly powered humidity sensor that senses high RH and is expected to be used as a wearable electronic/sensor in the future.

Absolute Luminous Flux and Quantum Yield of Sm3+-Doped Cadmium-Aluminum-Silicate Glasses under the Pumping of Blue Light Emitting Diode

2013 ◽  
Vol 275-277 ◽  
pp. 1974-1977 ◽  
Author(s):  
Yu Lei ◽  
Fang Fang Fu ◽  
Li Zheng ◽  
Zhi Qiang Wang ◽  
Xin Zhao ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Blue Light ◽  
Optical Radiation ◽  
Light Emitting Diode ◽  
Luminous Flux ◽  
Silicate Glasses ◽  
Integrating Sphere ◽  
Aluminum Silicate ◽  
Light Emitting ◽  
Ccd Detector

Absolute luminous flux and quantum yield for multichannel transition emissions have been determined in samarium ion (Sm3+)-doped cadmium-aluminum-silicate (CAS) glasses under the pumping of blue light emitting diode (LED) using an integrating sphere of 30 cm diameter, which connected to a CCD detector with a 400 μm-core optical fiber. The radiant flux and luminous flux for the visible transition emissions (550–750 nm) of Sm3+under the blue LED excitation were solved to be 123 μW and 32 mlm, respectively, which occupied 1.51% and 7.16% of the whole. The total quantum yield of the visible fluorescence of Sm3+has been calculated to be 2.52%. Investigation on optical radiation parameters for multichannel visible transition emissions of Sm3+in CAS glasses provides a reference in developing luminescence and display materials.

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