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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 | 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 on the speaker next to the 19" rack and displays messages from IRC users. | ||
[[user:DeDaan|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. | [[user:DeDaan|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. | ||
Revision as of 20:49, 1 February 2013
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| Participants | Bjornl |
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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 on the speaker next to 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 ( http://www.flickr.com/photos/bjornlammers/8425066292/in/photostream ) 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.
The LED panel ( http://www.flickr.com/photos/bjornlammers/8425075284/in/photostream ) contains:
- 6 * SN74LS273N ( http://www.alldatasheet.com/datasheet-pdf/pdf/5696/MOTOROLA/SN74LS273N.html )
- 6 * uA9668PC ( http://www.alldatasheet.com/datasheet-pdf/pdf/102338/FAIRCHILD/UA9668PC.html )
- 1 * SN74LS138N Decoder/demultiplexer ( http://www.alldatasheet.com/datasheet-pdf/pdf/5654/MOTOROLA/SN74LS138N.html )
- 2 * SN74LS138N 8-Bit Addressable Latches ( http://www.alldatasheet.com/datasheet-pdf/pdf/51060/FAIRCHILD/DM74LS259N.html )
- 4 * unmarked IC
See also this tech-archive thread: http://sci.tech-archive.net/Archive/sci.electronics.repair/2012-06/msg00302.html