Raspberry Pi GnuPlot Temperature

Posted by on February 14, 2013 1 comment

So, I have a raspberry Pi, and I wanted to chart it’s CPU temp

Ex: temp log hosted on RPI itself   | backup if the the RPI is down

To do this I needed to do a few things:

  1. Log the CPU temp (I’m doing every 5 minutes)
  2. Prepare the data
  3. Chart
  4. Show it to the world

1) Log data via 5 minute cron:

$ cat templog.sh 
temp=` cat /sys/class/thermal/thermal_zone0/temp| awk -v FS=" " '{print $1/1000""}'` 
echo "$temp | `date` ">>~/temp.log

Then a cronjob as normal user

*/5 * * * * bash ~/templog.sh

now a gnuplot script (plot.pg)

#!/usr/bin/gnuplot
reset
set nokey
plot "/home/pi/temp500" u 0:1
MAX=GPVAL_Y_MAX
min_y = GPVAL_DATA_Y_MIN
max_y = GPVAL_DATA_Y_MAX
f(x) = mean_y
fit f(x) '/home/pi/temp500'  u 0:1 via mean_y
 
set label 1 gprintf("Min = %g", min_y) at 52, 21 tc rgb "#00FFFF"
set label 2 gprintf("Max = %g", max_y) at 0, 21  tc rgb "#FF0000"
set label 3 gprintf("Mean = %g", mean_y) at 102, 21 tc lt 2
set terminal png size 1400,400
set style data linespoints
set yrange [20:MAX+(MAX*.1)]
set grid
set style line 1 lt 1 lw 3 pt 3 linecolor rgb "blue"
set object 1 rectangle from graph 0,0 to graph 1,1 behind fc rgbcolor "#10000f" lw 0
set pointsize .5
plot  \
"/home/pi/temp500" using 0:1 title "cpu temp" pt 5 ps .5  lc rgb "#FF0000" , \
min_y with filledcurves y1=min_y lt 1 lw 2 lc rgb "#00FFFF"  , \
max_y with filledcurves y1=max_y lt 2 lw 2 lc rgb "#FF0000", \
mean_y with filledcurves y1=mean_y lt 3 lw 2 lc 2,\
 "/home/pi/temp500" using 0:1 title "cpu temp" pt 5 ps .10  lc rgb "#0FfFFF"

now a script to run it all: (plot.sh)

#!/bin/bash
cat /home/pi/temp.log|tail -n 500 > /home/pi/temp500A
sed '/-/d'  /home/pi/temp500A  > /home/pi/temp500
chown pi:pi /home/pi * 
/root/plot.pg > /var/www/temp.png

Python function to update a var in a list of tuple

Posted by on December 3, 2012 1 comment

As part of my new ssh-fail script, now written in python I found myself needing to update a var in a list of a list, but you can’t just do list_a[3][3]= ‘new thing’ :(

so i wrote this function:

def tuple_update(touple, varloc, newval):
    temp = []
    for a in range(len(tuple)):
        if varloc != a:
            temp.append(tuple[a])
        else:
            temp.append(newval)
    return temp

and you can use it like this:

>>>ip_test=[('8.8.8.8', 423, None, 0), ('4.2.2.2', 64, None, 3), ('42.42.42.42', 23, None, 10)]
 
>>> ip_test[1]
('4.2.2.2', 64, None, 3)
>>> ip_test[1]=tuple_update(ip_test[1],1,38)
>>> ip_test[1]
['4.2.2.2', 38, None, 3]
>>> ip_test[2]=tuple_update(ip_test[2],0,'100.100.2.3')
>>> ip_test[2]
['100.100.2.3', 23, None, 10]
>>> ip_test
[['9.9.9.9', 423, None, 0], ['4.2.2.2', 38, None, 3], ['100.100.2.3', 23, None, 10]]

that’s: tuple_update(list,location,newval)

SourceForge direct download with clean filename

Posted by on December 3, 2012 No comments

If you ever wget files from source forge you’ll know how the file name will be annoying with a bunch of extra crap

so…:

 

#!/bin/bash
file=`echo $1 | sed 's,.*/,,g; s/?.*//'`
echo $file
wget "$1" -O ./$file

for: 

% ~/sf.sh "http://downloads.sourceforge.net/project/gns-3/GNS3/0.8.3.1/GNS3-0.8.3.1-src.tar.bz2?r=http%3A%2F%2Fsourceforge.net%2Fprojects%2Fgns-3%2F%3Fsource%3Ddirectory&ts=1354547913&use_mirror=voxel"
GNS3-0.8.3.1-src.tar.bz2
--2012-12-03 10:18:49--  http://downloads.sourceforge.net/project/gns-3/GNS3/0.8.3.1/GNS3-0.8.3.1-src.tar.bz2?r=http%3A%2F%
<>

Length: 2611269 (2.5M) [application/x-bzip2]
Saving to: `./GNS3-0.8.3.1-src.tar.bz2'

100%[=======================================================================================================================================================================>] 2,611,269   2.37M/s   in 1.1s    

2012-12-03 10:19:16 (2.37 MB/s) - `./GNS3-0.8.3.1-src.tar.bz2' saved [2611269/2611269]
 
( ~/del/sftest )% ls
GNS3-0.8.3.1-src.tar.bz2

yay!