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Get on the LED sign!


bouche

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What's this all about, anyway?

Ian owns a computer store. He sells new and recycled computers. Sometimes, people give Ian old computers and electronic equipment that they don't want any more.

One day, Ian was given an LED sign. What is an LED sign, you ask? An LED sign is a display that uses a grid of over 6000 lights (LEDs) to show text, images, graphics, etc. This one came from a drug store.

Around Christmas 1999, Ian contacted Dave and told him about the sign. Much to Dave's eternal regret, Dave writes database software for a living, but he couldn't resist the lure of The Sign. From January 2000 to May 2000, Dave and Ian reverse-engineered the sign and put it on the Web. Now it hangs in Ian's living room. Dave currently resides in Melita.

Who did it, and why?

We told you already: Dave and Ian did it. Why? Because it's there. Because it needed doing. Because we had nothing better to do. Because it was fun, and because we now know how to reverse-engineer controller cards, write Linux device drivers, mess about with sockets, make UNIX daemons, and fix all of the above when they break. And then break them again...

But it's good. It's all good.

Technical Information

The sign consists of a 128 x 48 red 3-shade LED matrix and PC controller card manufactured by JVF Incorporated.

We developed a Linux device driver -- based on the floppy drive device driver source code from the Linux kernel -- and a Linux daemon to listen on a TCP/IP socket for images sent to the sign. The daemon accesses our custom device driver. We developed PHP-based Web interfaces to the sign that allow anyone on the Internet to display stock quotes, view the time and temperature in Brandon, Manitoba; and send messages to the sign in Ian's apartment.

We also developed some Windows apps in Delphi that allow the sign to display sound card output as a spectrum analyzer, capture video, display scrolling text,ported various java games to work with the LEDSign, etc.

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