small refactor

readSensor

@@ -13,7 +13,7 @@
 RETRY=3
 
 # Number of seconds to wait between retries
-DELAY=3
+DELAY=2
 
 # Specify the temperature range where you expect the sensors will be operating
 # This is simply used as a safeguard to detect implausible sensor readings
@@ -36,7 +36,7 @@ declare -A SENSORS=( [0]=LuftTemp [1]=WasserTemp [2]=BodenTemp )
 
 # Location where the readings should be stored
 OUTFILE="output"
-
+RESULT=""
 
 #
 # no configuration/changes should be necessary below this line
@@ -44,7 +44,6 @@ OUTFILE="output"
 
 cd "$(dirname "$0")";
 touch "$OUTFILE" 2> /dev/null
-echo "Timestamp="`date +%s` > "$OUTFILE"
 
 if [ ! -w $OUTFILE ]; then
     echo "Error: output file '$OUTFILE' not writeable"
@@ -64,13 +63,19 @@ function check_output () {
             read_sensor
             check_output
         else
-            echo "${SENSORS[$SENSORID]}=Error" > "$OUTFILE"
+            RESULT="$RESULT${SENSORS[$SENSORID]}=Error\n"
         fi
     fi
 }
 
-function write_results () {
-    echo "${SENSORS[$SENSORID]}=${VALUE}" >> "$OUTFILE"
+function store_result () {
+    RESULT="$RESULT${SENSORS[$SENSORID]}=${VALUE}\n"
+}
+
+function write_to_file () {
+    echo "Timestamp="`date +%s` > "$OUTFILE"
+
+    echo -e "$RESULT" >> "$OUTFILE"
 }
 
 for SENSORID in  "${!SENSORS[@]}"
@@ -78,6 +83,7 @@ do
     CNT=0
     read_sensor
     check_output
-    write_results
+    store_result
     sleep $DELAY
 done
+write_to_file