Created
April 30, 2017 18:46
-
-
Save rzbrk/49147c17f35a05f60b9f637f0ba30fee to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
#!/bin/bash | |
#Quelle: http://opengeiger.de/Feinstaub/FeinstaubDatenLogger.pdf | |
#Anpassung für big endian unter RHEL 7 | |
WDIR=~ | |
while true; do | |
stty -F /dev/ttyUSB0 9600 raw | |
INPUT=$(dd conv=swab bs=10 count=1 </dev/ttyUSB0 2>/dev/null | od -x -N10 |head -n 1|cut -f2-10 -d" "); | |
#Ausgabe | |
#echo $INPUT | |
#echo " " | |
FIRST4BYTES=$(echo $INPUT|cut -b1-4); | |
#echo $FIRST4BYTES | |
if [ "$FIRST4BYTES" = "aac0" ]; then | |
# echo "check for correct intro characters: ok" | |
echo " " | |
else | |
echo "incorrect sequence, exiting" | |
exit; | |
fi | |
PPM25LOW=$(echo $INPUT|cut -f2 -d " "|cut -b1-2); | |
PPM25HIGH=$(echo $INPUT|cut -f2 -d " "|cut -b3-4); | |
PPM10LOW=$(echo $INPUT|cut -f3 -d " "|cut -b1-2); | |
PPM10HIGH=$(echo $INPUT|cut -f3 -d " "|cut -b3-4); | |
#zu Dezimal konvertieren | |
PPM25LOWDEC=$( echo $((0x$PPM25LOW)) ); | |
PPM25HIGHDEC=$( echo $((0x$PPM25HIGH)) ); | |
PPM10LOWDEC=$( echo $((0x$PPM10LOW)) ); | |
PPM10HIGHDEC=$( echo $((0x$PPM10HIGH)) ); | |
PPM25=$(echo "scale=1;((( $PPM25HIGHDEC * 256 ) + $PPM25LOWDEC ) / 10 )"|bc -l ); | |
PPM10=$(echo "scale=1;((( $PPM10HIGHDEC * 256 ) + $PPM10LOWDEC ) / 10 )"|bc -l ); | |
echo "Feinstaub PPM25: $PPM25" | |
echo "Feinstaub PPM10: $PPM10" | |
done |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment