Implementation of a colorful RGB-LED light source with an 8-bit microcontroller

Yang, Yueh-Ru

doi:10.1109/iciea.2010.5515525

Cited by 11 publications

(8 citation statements)

References 6 publications

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“…When LED is lit, the LED temperature rises with time until a balance state is reached and the brightness of LED decreases with any further rise in LED temperature [30]. This needs to be addressed when using the stimulator for prolonged periods of time.…”

Section: Rgb Ledmentioning

confidence: 98%

“…Negative SCP shift exhibits increased cortical excitability and positive SCP shifts reveal the cortical inhibition. VEP based paradigms have been explored widely by researchers to support or control external devices using visual stimulus [15,[23][24][25][26][27][28][29][30]. VEP based BCI technology can be further divided into those based on transient and steady state responses.…”

Section: Introductionmentioning

confidence: 99%

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A Configurable, Inexpensive, Portable, Multi-channel, Multi-frequency, Multi-chromatic RGB LED System for SSVEP Stimulation

Mouli

Palaniappan

Sillitoe

2014

Brain-Computer Interfaces

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Steady state visual evoked potential (SSVEP) is extensively used in the research of brain-computer interface (BCI) and require a controllable and configurable light source. SSVEP requires appropriate control of visual stimulus parameters, such as flicker frequency, light intensity, multi-frequency light source and multi-spectral compositions. Light emitting diodes (LEDs) are extensively used as a light source as they are energy efficient, low power, multi-chromatic, have higher contrast, and support wider frequency ranges. Here, we present the design of a compact versatile visual stimulus which is capable of producing simultaneous multiple frequency RGB LED flicker suitable for a wide range of SSVEP paradigms. The hardware is based upon the open source Arduino platform and supports on-the-fly reprogramming with easily configurable user interface via USB. The design provides fourteen independent high output channels with customisable output voltages. The flicker frequencies can be easily customised within the frequency range of 5-50 Hz, using a look-up table. The LED flickers are generated with single RGB LEDs which generate the required colour or frequency combinations for combined multi-frequency flicker with variable duty cycle to generate SSVEP. Electroencephalogram (EEG) signals have been successfully recorded from five subjects using the stimulator for different frequencies, colours, duty cycle, intensity and multiple frequency RGB source, thereby demonstrating the high usability, adaptability and flexibility of the stimulator. Finally we discuss the possible improvements to the stimulator which could provide real time user feedback to reduce visual fatigue and so increase the level of user comfort.

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Section: Rgb Ledmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

A Configurable, Inexpensive, Portable, Multi-channel, Multi-frequency, Multi-chromatic RGB LED System for SSVEP Stimulation

Mouli

Palaniappan

Sillitoe

2014

Brain-Computer Interfaces

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“…Where r, g and b are defined as the brightness ratio of RGB-LED which can be used to mix color C [7]. According to the above Color Matching Calculation, We obtained the color matching ratio table in Table I.…”

Section: B Color Matching Calculationmentioning

confidence: 99%

Temperature controlling system for LED lighting based on ARM

Liu

Sun

Shi

et al. 2013

2013 3rd International Conference on Consumer Electronics, Communications and Networks

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Since LEDs are generally considered to be an important lighting source of the future, an ARM-based LED intelligent lighting system was provided in this paper. According to the ambient temperature obtained by sensors, the designed system can adjust the glow color automatically to provide a pleasant lighting environment. Based on the ARM Cortex-M0 processor, the hardware and software of this system were accomplished and a series of pulse width modulation signals were generated to drive the LEDs. The testing results of the physical prototype show that the designed system works well. Thus, the preliminary research proves the possibilities of smart lighting.

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“…Yang proposed a vector formulation for a general color production using a combination of RGB lights. The general color can be mixed by controlling the magnitudes of the pure colors (Yang 2010). The magnitudes are related with the irradiation of the RGB lights and can be varied by the voltage inputs of the RGB lights.…”

Section: Optical Mixer and Rgb Control For Fine Images 215mentioning

confidence: 99%

“…Qu proposed a method providing for the accurate control of colors without light sensors (Qu, Wong, and Tse 2007). Yang developed a colorful light source using an 8-bit controller (Yang 2010). The colorful source is driven by a PWM control and temperature compensation; various colors were produced in the experiment.…”

Section: Introductionmentioning

confidence: 99%

An Optical Mixer and RGB Control for Fine Images using Grey Scale Distribution

Kim

Cho

2012

International Journal of Optomechatronics

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We considered the issue of color mixing from the viewpoint of gray scale images and investigated the effect of the mixed light. The goal of this study was to improve the quality of the grey scale images by using mixed RGB illumination. The mixing mechanism and image quality were formulized and applied to a machine vision system with an RGB mixer. The RGB mixer was made of RGB LEDs, a power AMP, a mixing chamber, and a bundle of optical fibers. The intensity of the RGB light was adjusted by varying the 12 bit DAC voltage. The optical characteristics of the RGB LEDs were measured by a spectrometer. The color variation of the mixed light was monitored by a chromatic meter. Grey scale images were captured and analyzed under various lighting conditions provided by the mixer. The optimal illumination was determined by the distribution of the grey scale in the captured image. The chromatic diagram showed that various colors can be generated, and the image histogram showed that the mixed light can increase the quality of the grey scale image.

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Implementation of a colorful RGB-LED light source with an 8-bit microcontroller

Cited by 11 publications

References 6 publications

A Configurable, Inexpensive, Portable, Multi-channel, Multi-frequency, Multi-chromatic RGB LED System for SSVEP Stimulation

A Configurable, Inexpensive, Portable, Multi-channel, Multi-frequency, Multi-chromatic RGB LED System for SSVEP Stimulation

Temperature controlling system for LED lighting based on ARM

An Optical Mixer and RGB Control for Fine Images using Grey Scale Distribution

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