How to read data from SDS011 sensor via USB serial connection, from http://opengeiger.de/Feinstaub/FeinstaubDatenLogger.pdf

read-sds011-data.sh

#!/bin/bash


# 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