#!/bin/bash

GPIOPIN=4
MINTEMP=-30
MAXTEMP=40
CMD="${PWD}/external/Adafruit_Python_DHT/examples/AdafruitDHT.py"
OUTFILE="${PWD}/output"

touch "$OUTFILE"
CNT=0

function read_sensor () {
    OUTPUT=`$CMD 22 $GPIOPIN`
    T=`echo "$OUTPUT" | awk -F[=*%] '{print $2}'`
    H=`echo "$OUTPUT" | awk -F[=*%] '{print $4}'`
    CNT=$(($CNT+1))
    echo "$CNT"
}
function check_output () {
    if [[ $OUTPUT =~ Fail ]] || [[ ! $OUTPUT =~ Temp ]] || [[ ! $OUTPUT =~ Humidity ]] || [ ${T%.*} -lt $MINTEMP ] || [ ${T%.*} -gt $MAXTEMP ]; then
        if [ $CNT -le 3 ]; then
            sleep 5
            read_sensor
	    check_output
        else
            echo "Error" > "$OUTFILE"
            exit 0
        fi
    fi
}

read_sensor
check_output

echo `date +%s` > "$OUTFILE"
echo "${T}" >> "$OUTFILE"
echo "${H}" >> "$OUTFILE"