LED banner wall

NURDspace Project
Participants	Bjornl
Skills
Status
Niche
Purpose
Tool
Location
Cost
Tool category

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Small sign

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 (!wall and !speak). Code is available on github, based on this earlier code.

Large sign

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 * DM74LS259N 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

Source code

• First try https://gist.github.com/zarya/10f47d6b3097643f4016

Schema's / Electronics

Arduino

2 - D0
3 - D1
4 - D2
5 - D3
6 - D4
7 - D5
8 - D6
9 - MR
14 (A0) - A0
15 (A1) - A1
16 (A2) - A2
17 (A3) - E1
18 (A3) - E2

PIN OUT

01 - VCC
02 - VCC
03 - VCC
04 - SN74LS273N PIN 1 (MR)
05 - SN74LS138N PIN 5 (E2)
06 - SN74LS273N PIN 4 (D1)
07 - SN74LS138N PIN 1 (A0)
08 - SN74LS273N PIN 3 (D0)
09 - SN74LS138N PIN 2 (A1)
10 - SN74LS273N PIN 7 (D2)
11 - SN74LS138N PIN 3 (A2)
12 - SN74LS273N PIN 17 (D6)
13 - SN74LS138N PIN 4 (E1)
14 - SN74LS273N PIN 13 (D4)
15 - GND
16 - SN74LS273N PIN 8 (D3)
17 - GND
18 - SN74LS273N PIN 14 (D5)
19 - GND
20 - GND