# HG changeset patch
# User Daniel O'Connor <darius@dons.net.au>
# Date 1384954288 -37800
# Node ID 139e267c9965610a71f0aaf79c870bd64c7086c9
# Parent  08b192a6e189760081844ed2f6e7110c6a13a40d
Use DERIVE instead of counter.
Add graph example

diff -r 08b192a6e189 -r 139e267c9965 README
--- a/README	Wed Nov 20 23:44:55 2013 +1030
+++ b/README	Thu Nov 21 00:01:28 2013 +1030
@@ -1,16 +1,23 @@
 An RRD can be created like so..
 
-rrdtool create ~/meter.rrd		\
-	DS:import:COUNTER:600:U:U	\
-	DS:export:COUNTER:600:U:U	\
-	RRA:AVERAGE:0.5:1:105120	\
-	RRA:AVERAGE:0.5:12:105120	\
-	RRA:MAX:0.5:1:105120		\
-	RRA:MAX:0.5:12:105120		\
-	RRA:MIN:0.5:1:105120		\
+rrdtool create ~/meter.rrd \
+	DS:import:DERIVE:600:U:U \
+	DS:export:DERIVE:600:U:U \
+	RRA:AVERAGE:0.5:1:105120 \
+	RRA:AVERAGE:0.5:12:105120 \
+	RRA:MAX:0.5:1:105120 \
+	RRA:MAX:0.5:12:105120 \
+	RRA:MIN:0.5:1:10512 \
 	RRA:MIN:0.5:12:105120
 
 Then data added with..
 rrdtool update ~/meter.rrd `ssh -ay -i ~/.ssh/id_rpi pi@raspberrypi python iec1107/iec1107.py -r /dev/ttyUSB0`
 
+Graph with..
+rrdtool graph ~/html/power-day.png --start -86400 -t "Power import/export (last 24 hours)"\
+            DEF:import=$HOME/meter.rrd:import:AVERAGE \
+            DEF:export=$HOME/meter.rrd:export:AVERAGE \
+            AREA:import\#00FF00:"Imported (Wh)" \
+            LINE1:export\#0000FF:"Exported (Wh)"
+