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Authors
Abstract(s)
Para dar resposta aos grandes avanços tecnológicos e, consequentemente, à postura mais
exigente dos clientes, a empresa Francisco Parracho – Electrónica Industrial, Lda., que tem
actividade no ramo dos elevadores, decidiu introduzir no mercado um controlador
dedicado de ecrãs Liquid Crystal Display / Thin Film Transistor (LCD / TFT). O objectivo
é substituir um sistema suportado por um computador, caracterizado pelas suas elevadas
dimensões e custos, mas incontornável até à data, nomeadamente para resoluções de ecrã
elevadas.
E assim nasceu este trabalho. Com uma selecção criteriosa de todos os componentes e,
principalmente, sem funcionalidades inúteis, obteve-se um sistema embebido com
dimensões e custos bem mais reduzidos face ao seu opositor.
O ecrã apontado para este projecto é um Thin Film Transistor – Liquid Crystal Display
(TFT-LCD) da Sharp de 10.4” de qualidade industrial, com uma resolução de 800 x 600
píxeis a 18 bits por píxel.
Para tal, foi escolhido um micro-controlador da ATMEL, um AVR de 32 bits que, entre
outras características, possui um controlador LCD que suporta resoluções até 2048 x 2048
píxeis, de 1 a 24 bits por píxel.
Atendendo ao facto deste produto ser inserido na área dos elevadores, as funcionalidades,
quer a nível do hardware quer a nível do software, foram projectadas para este âmbito.
Contudo, o conceito aqui exposto é adjacente a quaisquer outras áreas onde este produto se
possa aplicar, até porque o software está feito para se tornar bem flexível.
Com a ajuda de um kit de desenvolvimento, foram validados os drivers dos controladores e
periféricos base deste projecto. De seguida, aplicou-se esse software numa placa de
circuito impresso, elaborada no âmbito deste trabalho, para que fossem cumpridos todos os
requisitos requeridos pela empresa patrocinadora:
- Apresentação de imagens no ecrã consoante o piso;
- Possibilidade de ter um texto horizontalmente deslizante;Indicação animada do sentido do elevador;
- Representação do piso com deslizamento vertical;
- Descrição sumária do directório de pisos também com deslizamento vertical;
- Relógio digital;
- Leitura dos conteúdos pretendidos através de um cartão SD/MMC;
- Possibilidade de actualização dos conteúdos via USB flash drive.
With the intent to keep up with the major technological breakthroughs and therefore answer to the most demanding customers, the company Francisco Parracho – Electrónica Industrial, Lda., well established in the elevators field, has decided to market a dedicated Liquid Crystal Display / Thin Film Transistor (LCD / TFT) screen controller. The aim is to replace a computer based system, characterized by its inevitable large dimensions and high price, particularly for high screen resolutions. And that's how this work began. With a careful selection of all components and, especially, without unnecessary features, we have obtained an embedded system with much lower size and cost compared to the previous solution. The screen selected for this project is an industrial grade 10.4” Sharp Thin Film Transistor - Liquid Crystal Display (TFT-LCD), with 800 x 600 pixels of resolution at 18 bits per pixel. To accomplish this work, an ATMEL 32-bit AVR microcontroller was chosen, with features including a LCD controller with support for resolutions up to 2048 x 2048 pixels, 1 to 24 bits per pixel. Because this product was targeted to the elevators field, the features, both in hardware and software, have been directed to this area. However, because the software was made flexible enough, the same concept can be applied to any other areas where this product would be suitable. Using a software development kit, the base controller and peripheral drivers were validated for this project. Then, a printed circuit board was designed and fabricated to accommodate all the requirements required by the sponsoring company: - Displaying floor directory with images; - Possibility of having an horizontal text banner; - Animated elevator direction sign; - Vertical sliding floor number animation;Brief description of the floor directory also with vertical sliding animation; - Digital clock; - SD/MMC support for media contents; - Update procedure using an USB flash drive.
With the intent to keep up with the major technological breakthroughs and therefore answer to the most demanding customers, the company Francisco Parracho – Electrónica Industrial, Lda., well established in the elevators field, has decided to market a dedicated Liquid Crystal Display / Thin Film Transistor (LCD / TFT) screen controller. The aim is to replace a computer based system, characterized by its inevitable large dimensions and high price, particularly for high screen resolutions. And that's how this work began. With a careful selection of all components and, especially, without unnecessary features, we have obtained an embedded system with much lower size and cost compared to the previous solution. The screen selected for this project is an industrial grade 10.4” Sharp Thin Film Transistor - Liquid Crystal Display (TFT-LCD), with 800 x 600 pixels of resolution at 18 bits per pixel. To accomplish this work, an ATMEL 32-bit AVR microcontroller was chosen, with features including a LCD controller with support for resolutions up to 2048 x 2048 pixels, 1 to 24 bits per pixel. Because this product was targeted to the elevators field, the features, both in hardware and software, have been directed to this area. However, because the software was made flexible enough, the same concept can be applied to any other areas where this product would be suitable. Using a software development kit, the base controller and peripheral drivers were validated for this project. Then, a printed circuit board was designed and fabricated to accommodate all the requirements required by the sponsoring company: - Displaying floor directory with images; - Possibility of having an horizontal text banner; - Animated elevator direction sign; - Vertical sliding floor number animation;Brief description of the floor directory also with vertical sliding animation; - Digital clock; - SD/MMC support for media contents; - Update procedure using an USB flash drive.
Description
Keywords
Controlador Ecrã LCD Píxeis Elevador Piso Micro-controlador (μC) Hardware Software Camada da aplicação Controller Screen Pixels Elevator Floor Microcontroller (μC) Application layer
Citation
Publisher
Instituto Politécnico do Porto. Instituto Superior de Engenharia do Porto