Large 25×25 LED sign board

Bright LEDs are cheap today. So many new projects with large amount of LEDs can be done. But there is one problem – large amount of LEDs consume large amount of energy. This is a project that implements special technique that allows driving efficiently hundreds of LEDs. This is a large PCB where 25×25 (625 total) LED grid is soldered. Resistors and transistors are positioned around the edges of message board. That entire grid is controlled by AVR Atmega164 microcontroller.

25x25_LED_sign_board.jpg

Displaying technique works as follows: microcontroller scans all display row by row through multiplexer. Scanning speed is fast enough to see all non flickering images. Project is published as open hardware. PCB and AVR-GCC project files are free to download. But if you want it quicker – you can always get a kit.

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3 Comments

  1. Pingback: 25×25 LED Display » project hal0

  2. 25×25 LED Display project & program

  3. Pls,
    Can have details circuitry and diagram of the above 25X25 LED display project and so I can practice. Because I am interested in PIC project and I am a student in Ghana.

    Thanks.
    Carrie

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