5x7 Electronic Message Card

Posted by Yoshimasa Niwa on 05/01, 2007

LED Matrix is one of the favorite devices for many people. This tiny gadget is a very simple LED message card. We can display any messages on this LED, and reader can read them by pushing the button to scroll them. I designed and implement it as a present for my friends.


LEDs are dynamically driven by a micro computer, I use AT90S2313 provided by Atmel. The program written in it includes basic characters’ fonts and message body, and driver codes.


  • This firmware is for AT90S2313 with 10Mhz osc.
  • You can compile them with gcc-avr+avr-libc
  • On Windows, it is known as WinAVR



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