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1. • 
   • Gregg
   • Posted on Fri 3 Feb 2012 02:24 PM

   For the Radio strength website, does it have to be any particular language?

   I ask because RRDTool is a pretty cool and powerful tool to graph just about anything that can provide a number.

   Its a simple matter to create the database:

   #!/bin/bash

   #

   cd /var/www/radio

   /usr/bin/rrdtool create radio_db.rrd \

   --step 60 \

   DS:radiostrength:GAUGE:120:0:5000 \

   RRA:AVERAGE:0.5:1:1440 \

   RRA:AVERAGE:0.5:10:1008 \

   RRA:AVERAGE:0.5:30:1440 \

   RRA:AVERAGE:0.5:180:1440 \

   RRA:AVERAGE:0.5:720:1440 \

   RRA:MAX:0.5:1:1440 \

   RRA:MAX:0.5:10:1008 \

   RRA:MAX:0.5:30:1440 \

   RRA:MAX:0.5:180:1440 \

   RRA:MAX:0.5:720:1440

   Then Update the database (via cron every 60 seconds):

   #!/bin/bash

   #

   ### set the paths

   rrdtool="/usr/bin/rrdtool"

   ### change to the script directory

   cd /var/www/radio/

   RETURN_DATA=`curl -s -N http://127.0.0.1/radio/data.php` // this is the URL to get the signal reading

   ### update the database

   $rrdtool update radio_db.rrd --template radiostrength N:$RETURN_DATA

   Then create the graph (again via cron):

   #!/bin/bash

   #

   ## change directory to the rrdtool script dir

   cd /var/www/radio/

   ## Graph for last 24 hours

   /usr/bin/rrdtool graph radio_graph.png \

   -w 1200 -h 600 -a PNG \

   --slope-mode \

   --start -86400 --end now \

   --font DEFAULT:7: \

   --title "Radio Strength" \

   --watermark "`date`" \

   --vertical-label "strength" \

   --lower-limit 0 \

   --x-grid MINUTE:10:HOUR:1:MINUTE:120:0:%R \

   --alt-y-grid --rigid \

   DEF:rstrength=radio_db.rrd:radiostrength:MAX \

   LINE1:rstrength#0000FF:"strength" \

   GPRINT:rstrength:LAST:"Cur\: %5.2lf" \

   GPRINT:rstrength:AVERAGE:"Avg\: %5.2lf" \

   GPRINT:rstrength:MAX:"Max\: %5.2lf" \

   GPRINT:rstrength:MIN:"Min\: %5.2lf\t\t\t" \

   Then you just need to display radio_graph.png for a graph of today's results. You can create other graphs that show week, month, year, etc.

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