LED banner wall

NURDspace Project
Participants	Bjornl
Skills
Status
Niche
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Yotson modified a small LED banner sign to be controlled by an Arduino. After hooking it up to the Dockstar and reprogramming SpaceBot it is now located in the 19" rack and displays messages from IRC users.

DeDaan brought in a larger sign. We plan on modifying this as well to have a second banner; if this is working, the smaller one will probably be used to indicate space state to the outside world from behind a window above the front door.

The larger sign contains a separate control unit, programmed using a separate keyboard with a DB-9 like plug. It is attached to a PCB containing the LEDs with a 20 pin flatcable. The control unit contains the following ICs:

• NEC D8049HC 195 (pre-programmed CPU)
• Motorola SN74LS373N ( http://www.alldatasheet.com/datasheet-pdf/pdf/5714/MOTOROLA/SN74LS373N.html )
• Toshiba TC5517APL (Static RAM, probably where the program is stored)
• unmarked IC, probably an EPROM

The Toshiba and the unmarked IC are in a socket, the other two are soldered to the PCB.