Door_Status

#!/bin/bash

# Door Log process started - Write today's date to log files
# Using -printf \n - command to print line break to highlight reboot in log 
#   - instead, you can uncomment the following line to start new log on every reboot

# rm /usr/share/webiopi/htdocs/door.log

printf "\nDoorTracker started at " >> /usr/share/webiopi/htdocs/door.log
date >> /usr/share/webiopi/htdocs/door.log

# GPIO 18 is used as door1 sensor
# Must be changed in two places if different 
# (Lines 16 & 27)

echo "18" > /sys/class/gpio/export

# Loop this whole script indefinitely
while true

do
# Start loop. Assign previous status (stored in file /usr/bin/door_state) & 
# get current status of GPIO pin. Verify GPIO to your door sensor.
# If no change in state, pause (sleep) then restart loop

STATE1_PRV=$(</usr/bin/door1_state)
STATE1_CUR=$(</sys/class/gpio/gpio18/value)

# ====================================

if [ "$STATE1_PRV" = "$STATE1_CUR" ]
then
       sleep 5
else

# 41: Create variable with current date & time in short format, &
# 43: update State_Text to current status, then
# 50: write date and current status text to log file.
# 52: Finally, write current status to previous status variable.

       STR1=$(date +%F)" "$(date +%R)

       if [ $STATE1_CUR = 1 ]
         then
           STATE1_TEXT='OPEN'
         else
           STATE1_TEXT='CLOSED'
       fi

       echo $STR1 ": DOOR 1 is" $STATE1_TEXT >> /usr/share/webiopi/htdocs/door.log

       echo $STATE1_CUR > /usr/bin/door1_state
fi
#       date

done