City Research Online

Digital LED Pixels: Instructions for use and a characterization of their properties

Jones, P. R. ORCID: 0000-0001-7672-8397, Garcia, S. E. and Nardini, M. (2016). Digital LED Pixels: Instructions for use and a characterization of their properties. Behavior Research Methods, 48(4), pp. 1266-1284. doi: 10.3758/s13428-015-0653-5

Abstract

This article details how to control light emitting diodes (LEDs) using an ordinary desktop computer. By combining digitally addressable LEDs with an off-the-shelf microcontroller (Arduino), multiple LEDs can be controlled independently and with a high degree of temporal, chromatic, and luminance precision. The proposed solution is safe (can be powered by a 5-V battery), tested (has been used in published research), inexpensive (∼ $60 + $2 per LED), highly interoperable (can be controlled by any type of computer/operating system via a USB or Bluetooth connection), requires no prior knowledge of electrical engineering (components simply require plugging together), and uses widely available components for which established help forums already exist. Matlab code is provided, including a ‘minimal working example’ of use suitable for use by beginners. Properties of the recommended LEDs are also characterized, including their response time, luminance profile, and color gamut. Based on these, it is shown that the LEDs are highly stable in terms of both luminance and chromaticity, and do not suffer from issues of warm-up, chromatic shift, and slow response times associated with traditional CRT and LCD monitor technology.

Publication Type: Article
Publisher Keywords: Light emitting diode, Arduino, Luminance, Timing, Color gamut
Subjects: B Philosophy. Psychology. Religion > BF Psychology
Q Science > QA Mathematics > QA75 Electronic computers. Computer science
R Medicine > RE Ophthalmology
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Departments: School of Health Sciences > Optometry & Visual Science
URI: https://openaccess.city.ac.uk/id/eprint/23795
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