Moving signs are a common enough sight today but off-the-shelf units are
invariably expensive and somewhat inflexible. The six-character module
described in this article can be cascaded up to 16 modules long and has
a character set that can be customised to suit your application. See on figure below

The dot matrix moving sign module presented here has a six character display area.
A maximum of 16 of these modules can be cascaded together to produce a 96-character display. The PCB layout for the module can accommodate 5×7-Matrix displays with a distance between the rows of pins of 33.0 mm (30 mm character height) but larger or smaller displays may also be fitted by using adapter boards, if the LED matrix is electrically compatible, of course. The big advantage of building this moving sign yourself is that the cost of the finished article is much less than that of a ready-built unit.
Most of the ICs used in the design are widely available and relatively cheap. The passive components are all standard and an AT89C2051 with Flash-memory is not the most expensive microcontroller. The main item from a cost point of view is the type
of LED matrix displays that are used.The microcontroller that controls the display module has a character set of 95 characters. The pre-programmed controller is supplied with the standard character set containing punctuation marks, symbols,
numbers and the alphabet (in upper and lower case) but there is also the possibility to program your own special characters and implement simple graphics.

The source code on Donload link, become a user to download the files.... ( dat_my_6char_x.rar )

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;) laros-edu team

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