Energy Efficiency Optimization Algorithm for Roadway Illumination Using ARM7TDMI Architecture

Rafael B. de Oliveira
Faculdade de Tecnologia Senai Porto Alegre, LEEQEE, Porto Alegre, Brazil

Fausto B. Líbano
Faculdade de Tecnologia Senai Porto Alegre, LEEQEE, Porto Alegre, Brazil

Ladda ner artikelhttp://dx.doi.org/10.3384/ecp11057883

Ingår i: World Renewable Energy Congress - Sweden; 8-13 May; 2011; Linköping; Sweden

Linköping Electronic Conference Proceedings 57:18, s. 883-890

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Publicerad: 2011-11-03

ISBN: 978-91-7393-070-3

ISSN: 1650-3686 (tryckt), 1650-3740 (online)


This paper presents an algorithm developed in C language that aims to help roadway illumination designers to create an illumination system that meets the standard’s limits with minimum electrical energy consuming. As a secondary function; the program allows the user to get approximate luminance and illuminance values for a specific system without field measuring. The algorithm was created to fit into a hardware prototype based in ARM7TDMI architecture; with no need for complicated and heavy software running in PC machines. The main system variables regarded by the optimization function are pole height (H) and pole spacing (S); putting the luminaries as far from each other as possible; in order to use the minimum power per km. Through calculation of the system’s luminance; the algorithm starts with S and H in their maximum values; decreasing every loop; subtracting the results from the standard limit (NBR5101-Brazil; CIE 118; EN 13201 or other standard loaded into the program) seeking for zero. Once the zero is found; the H and S values are put on a LCD or USB port; as algorithm results.


Roadway illumination algorithm; ARM application; Illumination energy efficiency


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