#!/bin/sh
cd /salad
DATETIME=`date "+%Y-%m-%d-%H-%M"`
COUNT=0
while (!(echo "$TEMP" | grep -E -q "^-?[0-9]+([.][0-9]+)?$"))
do
    COUNT=`expr $COUNT + 1`
    TEMP=`dht22 -p 38 -s temp`
    sleep 2
    if [ "$COUNT" -eq 10 ]
    then
        break
    fi
done
COUNT=0
while (!(echo "$HUM" | grep -E -q "^-?[0-9]+([.][0-9]+)?$"))
do
    COUNT=`expr $COUNT + 1`
    HUM=`dht22 -p 38 -s hum`
    sleep 2
    if [ "$COUNT" -eq 10 ]
    then
        break
    fi
done

echo "99" > /dev/ttyUSB0
WATER=`dd if=/dev/ttyUSB0 count=1`
WATERTEMP="$(echo "${WATER}" | tr -d 't')"

if [ "$COUNT" -eq 10 ]
then
    echo "Couldn't read temp/hum"
else
    echo "$DATETIME HUM = $HUM TEMP = $TEMP WATER = $WATERTEMP" >> SALAD_log.txt
fi

# air heater:
TEMPINT=${TEMP%.*}
if [ "$TEMPINT" -gt 21 ]
then
    echo "224" > /dev/ttyUSB0
    echo "ST $DATETIME 224 - AIR HEAT OFF" >> SALAD_log.txt
fi
if [ "$TEMPINT" -lt 19 ]
then
    echo "214" > /dev/ttyUSB0
    echo "ST $DATETIME 214 - AIR HEAT ON" >> SALAD_log.txt
fi
# water heater:
if [ "$WATERTEMP" -gt 21 ]
then
    echo "227" > /dev/ttyUSB0
    echo "ST $DATETIME 227 - WATER HEAT OFF" >> SALAD_log.txt
fi
if [ "$WATERTEMP" -lt 19 ]
then
    echo "217" > /dev/ttyUSB0
    echo "ST $DATETIME 217 - WATER HEAT ON" >> SALAD_log.txt
fi

cp /salad/SALAD_log.txt /var/www/html/sys/log.txt