I gambled around with the Raspberry Pi: installed the LAMP stack and gnuplot. For a first test I created a shell script which logs the temperature of the core, logs it into a file, and creates a graph:
#!/bin/bash LOGFILE=/home/pi/logs/temp.log OUTFILE=/home/pi/public_html/coretemp.png T=$(/usr/bin/vcgencmd measure_temp | cut -d'=' -f2 | sed 's/..$//') D=$(date '+%FT%T') echo "$D $T" >> $LOGFILE gnuplot << EOC set term png small set output "$OUTFILE" set xdata time set timefmt "%Y-%m-%dT%H:%M:%S" set format x "%Y-%m-%dn%H:%M:%S" set xlabel "date" set ylabel 'temperature [C]' set yrange [0:*] set grid set title "Raspberry Pi core tempreature" plot "$LOGFILE" using 1:2 with lines notitle EOC
The script is called every minute from cron. The resulting graph: