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digitemp/create_digitemp_png.sh
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digitemp/create_digitemp_png.sh
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#!/bin/sh
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## aus den per rrdtool datenbank werden hiermit bilder generiert
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nice -n 19 rrdtool graph /var/log/temperatur/temperatur1.png -a PNG -b 1024 --start -129600 -A \
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-l -10 -u 70 -t "Sensor1" --vertical-label "Grad Celsius" -w 600 -h 200 \
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DEF:g1=/var/log/temperatur/temperaturen.rrd:Sensor1:AVERAGE \
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DEF:gmin=/var/log/temperatur/temperaturen.rrd:Sensor1:MIN \
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DEF:gmax=/var/log/temperatur/temperaturen.rrd:Sensor1:MAX \
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VDEF:g1a=g1,LAST \
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VDEF:gmina=gmin,MINIMUM \
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VDEF:gmaxa=gmax,MAXIMUM \
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LINE2:g1#ff0000:"Sensor1" \
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GPRINT:g1a:"aktuell\: %5.2lf °C" \
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#GPRINT:gdurch:"Durchschnitt\: %5.2lf °C\n" \
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#GPRINT:gmina:"tiefste\: %5.2lf °C" \
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#GPRINT:gmaxa:"höchste\: %5.2lf °C" > /dev/null
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nice -n 19 rrdtool graph /var/log/temperatur/temperatur2.png -a PNG -b 1024 --start -129600 -A \
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-l -10 -u 60 -t "Sensor2" --vertical-label "Grad Celsius" -w 600 -h 200 \
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DEF:g1=/var/log/temperatur/temperaturen.rrd:Sensor2:AVERAGE \
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DEF:gmin=/var/log/temperatur/temperaturen.rrd:Sensor2:MIN \
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DEF:gmax=/var/log/temperatur/temperaturen.rrd:Sensor2:MAX \
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VDEF:g1a=g1,LAST \
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VDEF:gmina=gmin,MINIMUM \
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VDEF:gmaxa=gmax,MAXIMUM \
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LINE2:g1#ff0000:"Sensor2" \
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GPRINT:g1a:"aktuell\: %5.2lf °C" \
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#GPRINT:gdurch:"Durchschnitt\: %5.2lf °C\n" \
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#GPRINT:gmina:"tiefste\: %5.2lf °C" \
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#GPRINT:gmaxa:"höchste\: %5.2lf °C" > /dev/null
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digitemp/read_digitemp.sh
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digitemp/read_digitemp.sh
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#!/bin/sh
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# dieses script schreibt aktuelle temperaturmesswerte in die rrdtool
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# datenbankdatei (siehe unten)
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# (deswegen bestenfalls per crontab aufrufen lassen)
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#
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# der user dieses scriptes sollte der gruppe "dialout" angehoeren, um
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# auf /dev/ttyS0 zugreifen zu koennen
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#
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# parameter von digitemp:
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# -t0 oder -t1 : fragt den ersten oder zweiten Sensor ab
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# -q : nur die Temperatur ausgeben, keine anderen Informationen
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# -c/etc/digitemprc : das ist die erstellte Configdatei
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SENSOR1=`digitemp -t0 -q -c/etc/digitemprc | tr -s [:blank:] | cut -f7 -d" "`
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SENSOR2=`digitemp -t1 -q -c/etc/digitemprc | tr -s [:blank:] | cut -f7 -d" "`
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rrdtool update /var/log/temperatur/temperaturen.rrd N:$SENSOR1:$SENSOR2
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exit 0
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#### Vorarbeit ####
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## 1. digitemp config anlegen (enthaelt IDs der sensoren)
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digitemp -a -c/etc/digitemprc
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## 2. hiermit wird die rrdtool datenbankdatei einmalig angelegt
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rrdtool create /var/log/temperatur/temperaturen.rrd --step 60 \
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DS:Sensor1:GAUGE:120:U:U \
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DS:Sensor2:GAUGE:120:U:U \
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RRA:AVERAGE:0.5:1:2160 \
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RRA:AVERAGE:0.5:5:2016 \
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RRA:AVERAGE:0.5:15:2880 \
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RRA:AVERAGE:0.5:60:8760 \
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RRA:MIN:0.5:1:2160 \
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RRA:MIN:0.5:5:2016 \
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RRA:MIN:0.5:15:2880 \
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RRA:MIN:0.5:60:8760 \
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RRA:MAX:0.5:1:2160 \
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RRA:MAX:0.5:5:2016 \
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RRA:MAX:0.5:15:2880 \
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RRA:MAX:0.5:60:8760
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