LED banner wall: Difference between revisions

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== Large sign ==
== Large sign ==


[[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. This used to work at the previous location.


=== Current status ===
=== Current status ===
Software running on [[SpaceNanny]] as a service. To restart, merely:
Screen itself does seem to work. It shows 15 pixels in a row, this is because of the code running on the arduino. When we try showing stuff using [https://github.com/NURDspace/BigLedPanel/tree/master/server this code] it briefly blanks, and then the 15 pixels show again.


sudo service bigledpanel restart
<s>Software running on [[SpaceNanny]] as a service. To restart, merely:


sudo service bigledpanel restart</s>


=== Source code ===
=== Source code ===

Revision as of 13:39, 6 July 2019

LED banner wall
2013-07-02 23.08.34.jpg
Participants Bjornl
Skills Programming, electronics, Arduino
Status Operational
Niche Electronics
Purpose Infrastructure
Tool No
Location
Cost
Tool category

LED banner wall

2013-07-02_23.08.34.jpg {{#if:No | [[Tool Owner::{{{ProjectParticipants}}} | }} {{#if:No | [[Tool Cost::{{{Cost}}} | }}

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 stored somewhere. Code is available on github, based on this earlier code.

15/12/13

Petraea dragged the sign out to give it a little dusting down to find that a bunch of columns no longer worked(See inset animation) BrokenChip.gif A little digging around identified that the CLK line was broken, so a simple extra wire was fitted to repair this.

Left EditedLEDStripBack.jpg


Working.jpg

Large sign

DeDaan brought in a larger sign. This used to work at the previous location.

Current status

Screen itself does seem to work. It shows 15 pixels in a row, this is because of the code running on the arduino. When we try showing stuff using this code it briefly blanks, and then the 15 pixels show again.

Software running on SpaceNanny as a service. To restart, merely:

sudo service bigledpanel restart

Source code

old

First images

Schema's / Electronics

Arduino Pin setup

PORT_D
 0 (PD0) - UART RX
 1 (PD1) - D5
 2 (PD6) - D3 A0
 3 (PD5) - D4 A1
 4 (PD4) - D6 A2
 5 (PD3) - D2
 6 (PD2) - D0
 7 (PD1) - D1
PORT_B
 8  (PB0) - MR
 9  (PB1) - E1
 10 (PB3) - E2
PORT_C
 14 (A0,PC0) - A0
 15 (A1,PC1) - A1
 16 (A2,PC2) - A2

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

Ledboard groot schema.png Ledboard Chip placement.png

Old info

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:

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:

See also this tech-archive thread: http://sci.tech-archive.net/Archive/sci.electronics.repair/2012-06/msg00302.html