LotharGehlhaar - Teichbauforum

etc/modprobe.d/1-wire.conf
options wire max_slave_count=20

#! /bin/bash

# This script reads the temperature from all connected 1-wire temperature
# sensors of the DS1820 family.
# The script will answer nothing if it can't find any sensors.
#
# Author: San Bergmans
#         www.sbprojects.com

W1DIR="/sys/bus/w1/devices"

# Exit if 1-wire directory does not exist
if [ ! -d $W1DIR ]
then
    echo "Can't find 1-wire device directory"
    exit 1
fi

# Get a list of all devices
DEVICES=$(ls $W1DIR)

# Loop through all devices
for DEVICE in $DEVICES
do
    # Ignore the bus master device
    if [ $DEVICE != "w1_bus_master1" ]
    then
        # Get an answer from this device
        ANSWER=$(cat $W1DIR/$DEVICE/w1_slave)

        # See if device really answered
        # When a previously existing device is removed it will
        # read 00 00 00 00 00 00 00 00 00, which results in a
        # valid CRC. That's why we need this extra test.
        echo -e "$ANSWER" | grep -q "00 00 00 00 00 00 00 00 00"

        if [ $? -ne 0 ]
        then
            # The temperature is only valid if the CRC matches
            echo -e "$ANSWER" | grep -q "YES"
            if [ $? -eq 0 ]
            then
                # Isolate the temprature from the second line
                TEMPERATURE=$(echo -e "$ANSWER" | grep "t=" | cut -f 2 -d "=")
                # Isolate integer and fraction parts so we know where
                # the decimal point should go
                INTEGER=${TEMPERATURE:0:(-3)}
                FRACTION=${TEMPERATURE:(-3)}

                # Restore the leading 0 for positive and negative numbers
                if [ -z $INTEGER ]
                then
                    INTEGER="0"
                fi
                if [ "$INTEGER" == "-" ]
                then
                    INTEGER="-0"
                fi

                # Write result of this sensor
                echo "$DEVICE=$INTEGER.$FRACTION"
            else
                # A CRC was found, show error message instead
                echo "$DEVICE=CRC error"
            fi
        fi
    fi
done

root@raspberrypi:/var/www/teichmonitor# ./lesew1bus.sh

28-000004d03d5a=25.187
28-000004d0cc2a=25.250
28-000004d106d7=33.062
28-000004d13f94=25.125
28-000005bc958b=25.125
28-000005bca36e=24.875
28-000005bcf02c=25.437
28-000005bd176b=29.812
28-000005bd5d6e=25.500
28-000005be4a10=25.187
.......usw.