TEMPer cron + gnuplot

.gitignore

*.dat
*.png
*.txt
pcsensor-temper

cron.sh

#!/bin/bash
# crontab -e
# * * * * * /home/pi/cron.sh
cd /home/pi

TIME=$(date -u +%s)
TEMP=$(./pcsensor-temper/pcsensor)

[[ "$TEMP" == "" ]] && exit

if [[ -f temp.dat ]]; then
  LAST_TIME=$(tail -1 temp.dat | cut -d' ' -f1)
  if (( $LAST_TIME+300 < $TIME )); then
    echo >> temp.dat
  fi
fi

echo "$TIME $TEMP" >> temp.dat

gnuplot

#!/usr/bin/env gnuplot
set terminal png size 1800, 800

set xdata time
set timefmt "%s"

set grid
set xtics 3600
set ytics

set y2tics

set key outside

set title "Temp"
#set format x "%Y-%m-%d\n%H:%M"
#set format x "%dth\n%H:%M"
set format x "%H\n%d"
#set format x "%b %d"
set xlabel "Time"
set ylabel "Temp"

set output "temp-celsius.png"
plot "temp.dat" using ($1+(-8*3600)):2 title "celsius" with lines

set output "temp-fahrenheit.png"
plot "temp.dat" using ($1+(-8*3600)):($2*9/5+32) title "fahrenheit" with lines


set terminal dumb size 150, 30

set output "temp-celsius.txt"
plot "temp.dat" using ($1+(-8*3600)):2 title "celsius" with lines

set output "temp-fahrenheit.txt"
plot "temp.dat" using ($1+(-8*3600)):($2*9/5+32) title "fahrenheit" with lines