LED banner wall: Difference between revisions

From NURDspace
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=== Source code ===
=== Source code ===
* https://github.com/flok99/BigLedPanel
* https://github.com/flok99/BigLedPanel
===Protocol ===
The Raspi sends raw frames over serial at 115200 bps, each column in one byte, 7 bits per byte, from left to right (?).
The highest bit indicates start-of-frame. Code 0x81 means start of frame. Code 0x80 means end of frame.


==== old ====
==== old ====

Revision as of 13:01, 1 February 2021

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

Works! It is hanging above the door from bar to Zaal 1. There's a raspberry pi connected to it, with hostname hetisbar.dhcp.nurd.space. Port 5001 udp receives text. Root-account is the usual password. If it doesn't work, reboot it using the reboot command. Sometimes it does lose connection to the arduino of the banner (no /dev/ttyACM0 appears).

Port 5003 listens to pixelflut (UDP!).

home assistant integration

Source code

Protocol

The Raspi sends raw frames over serial at 115200 bps, each column in one byte, 7 bits per byte, from left to right (?). The highest bit indicates start-of-frame. Code 0x81 means start of frame. Code 0x80 means end of frame.

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