Temperature script controller for raspberry pi fan

temperature-controller.sh

#! /bin/bash

VERBOSE=1                                             #Log changes in a log file
LOGFILE=/var/log/temperature-controller.log
TMPTHRES=55	                                      #Temperature threshold in degrees
SLPON=300	                                      #Sleep time
MINH=07                                               #Threshold hours of work

oldstat=off
curstat=off

while true; do
  hour=`date +'%H'`
  if [ `echo "$hour < $MINH" | bc` -eq 1 ]; then      #Range of silence: [00h - 07h] AM
    if [ $curstat == "on" ]; then	              #If fan is on and we are in range of silence turn it off
      gpio mode 0 in	
    fi
    sleep `echo "(60 - \`date +\"%M\"\`)*60" | bc`    #Sleep until the next hour
    continue
  fi
  tmp=`/opt/vc/bin/vcgencmd measure_temp | cut -d "=" -f 2 | cut -d "'" -f 1`
  if [ `echo "$tmp > $TMPTHRES" | bc` -eq 1 ]; then
    gpio mode 0 out	                              #Turn on fan
    curstat=on;
  else
    gpio mode 0 in	                              #Turn off fan
    curstat=off
  fi

  if [[ $VERBOSE -eq 1 && $curstat != $oldstat ]]; then
    echo "[`date +'%m/%d/%Y %H:%M'`] fan: $curstat with temperature: $tmp C" >> $LOGFILE
    oldstat=$curstat
  fi
  sleep $SLPON
done