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#!/bin/bash
# by K.Jacobs / http://www.grautier.com / CC-by-NC-SA
## Temperatur I2C Sensor TNC75 over wget##

wget -q http://192.168.0.201/temp.txt -O /var/www/htdocs/data/flur-temp.tmp
LSB=$(cat /var/www/htdocs/data/flur-temp.tmp | awk -F "0x" '{print $2}')

MSB=$(echo "$LSB" | cut -c1-2)                                   # MSB = MSB
LSB=$(echo "$LSB" | cut -c3-4)                                   # LSB = LSB
LSB=$(echo "$LSB" | tr '[a-z]' '[A-Z]')                          # In grossbuchstaben wandeln für BC
LSB=$(echo "ibase=16; $LSB" | bc)                                # umwandeln HEX->DEC

if [ "$MSB" = "80" ]; then                                       # MSB = 80 dann 0,5 anfügen
       LSB=$(echo "scale=5; $LSB + 0.5" | bc)                    # .5 anfügen
fi

LSB=$(echo "scale=5; $LSB - 3" | bc)                             # Sensor Calibriren -3C

if [ "$LSB" = "-3" ]; then                                       # LSB = -3 dann var L�schen
       LSB=$(echo "")                                            # bei Datenfehler nichts Anzeigen
fi

echo $LSB

exit 0