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Build a 7×7 monochrome LED display

Here is the circuit schematic as well as build instructions and parts list for an easy to build 7×7 LED matrix.

The 7×7 monochrome LED display comes into its own when showing animations. The link shows the circuit schematic is quite simple. All you need is an AVR, a few transistors, com resistors and some logic to convert RS232 to TTL.

leds1.jpg

Tags: led display, led matrix, logic, resistors, transistors

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2 Comments

  1. Gamal Benkhaial
    July 15, 2008 17:52

    Dear Sirs
    Please if you can show me how to build a led display screen either full color or mono color, I would like to know the conniction circuit diagram if that is possible.
    Your help will be highly appreciated.
    Best regards.
    Gamal

  2. January 22, 2008 13:43

    This seems interesting. It would be really greatfull if you could provide some more details to build up the circuit.