Led Matrix

Goal

The goal of this project is to display Nagios Server's status on RGB Led Matrix.

I have 4 Led Matrix, the idea is to create one box per matrix with 230V connector and Data IN/OUT So we can decide if we want to use 1-4 Matrix

Data flow

1. Nagios server get servers status and store data into MySQL Database with XXXX plugin
2. Perl script on Alix (PC Engine) is getting data from MySQL and transmit data by JSON to mbed (by USB).
3. mbed get json's data from Alix and display to Led Matrix
4. Led matrix display Servers status :-)

Used componment

• 1 mbed NXP LPC1768 [1]
• 2 RGB Led Matix (64x32) for display
• 1 ALix 2d13 for getting Nagios status and sending to MBED

Hardware pieces listing (per matrix box)

Number	Description	Where to find	Price	Link
1	5vdc 4A PSU	Ebay	$10.99	http://tinyurl.com/3w465kh
2	IDC Socket 16POS	Digikey N°ASC16H-ND	$1.93	http://tinyurl.com/3qxmgrp
1	CHASSIS ALUM 5 X 10 X 3	Digikey N°377-1013-ND	$17.60	http://tinyurl.com/3bho3n6
1	SUB25 male	Digikey N°377-1013-ND	$17.60	http://tinyurl.com/3bho3n6
1	SUB25 Femele	Digikey N°377-1013-ND	$17.60	http://tinyurl.com/3bho3n6

Perl script on ALIX

This perl script is getting data form MySQL to send to mbed. It run every minutes by cron.

Requiert Perl modules

• blah
• blah
• blah

Source code

The source code is accessible from there

JSON data example

{
  "action": "insert",
  "id":0,
  "text": "server1.domain.ch",
  "position_x": 10,
  "position_y": 5,
  "position_lenght": 78,
  "scroll_speed": 255,
  "red": 3,
  "green": 0,
  "blue": 2
}

Field	Value	Description
action	string: insert,delete,modify	used to insert,delete,modify data vector on mbed
id	integer	id of data to modify,delete
text	string	text to display
position_x	integer	X position of text area
position_y	integer	Y position of text area
position_lenght	integer	lenght of text area
scroll_speed	integer 0-255	scrolling speed
red	integer 0-4	RGB value
green	integer 0-4	RGB value
blue	integer 0-4	RGB value

Special Thanks

Special thank to FIXME members who helped me with programmation and electronic stuff. Specialy to :

• Simon for hadware design and mbed code improvement.
• Mathieu for discovering LED Matrix and explainition of how it work.
• Jean-Baptist,Raphael,Marc for there help with my newbies programmation questions.
• Florian for his help for leds PWM

Project Owner

• Fred