Added readme

README.txt

@@ -0,0 +1,20 @@
+Arduino Nagios Display
+
+For creating an WiFi-enabled, Arduino-powered 8x5 LED matrix that displays Nagios status information
+Intentionally kept hackable, with lots of commented-out sections and debugging information available, because everyone's environment is slightly different.
+
+Included in distribution:
+- ArduinoNagiosDisplay.pde, based on Arduino SimpleClient and shiftOutCode Hello World examples
+- nag.php, based on GPL-licensed code by Jason Antman
+- ShiftOutExample images, copyright Arduino
+
+This program connects to a matching script on your Nagios server 
+ (it must return a string like $00001000200002100000 -- see included php script.)
+
+To assemble the hardware, I recommend an Arduino Diamondback, which is essentially an Arduino + WiShield.
+Look at the included ShiftOutExample images which are taken from the Shift Out Arduino tutorial at http://arduino.cc/en/Tutorial/ShiftOut
+The only difference is that the Diamondback/WiShield uses pins 14, 11, and 12 so I'm using pins 5,7, and 8 instead.
+
+To get the microcontroller software working, look at the ArduinoNagiosDisplay.pde comments.
+
+Also, put the nag.php script on your Nagios server outside of any authentication requirements. I put it at /var/www/nag.php . See the comment in the file and modify settings as needed.

nag.php

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 // change the statusFile to the location of status.dat on your Nagios system
 $statusFile = "/var/cache/nagios3/status.dat";
 
+// ------------- end config
+
 $nag_version = getFileVersion($statusFile); // returns integer 2 or 3
 $created_ts = 0;