first experimental version of script for cron

readSensor.sh

@@ -0,0 +1,37 @@
+#!/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"