84 lines
2.0 KiB
Plaintext
84 lines
2.0 KiB
Plaintext
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#!/bin/bash
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#
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# Copyright (c) 2018 leopold@shdx.org
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# Author: Der_Leopold
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#
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# This script tries to read sensor values from a 1wire bus and writes the results
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# and a timestamp to a file. It is intended to be executed periodically, for
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# example via crontab.
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#
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# Retry up to n times if the reading fails
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RETRY=3
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# Number of seconds to wait between retries
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DELAY=3
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# Specify the temperature range where you expect the sensors will be operating
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# This is simply used as a safeguard to detect implausible sensor readings
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MINTEMP=-30
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MAXTEMP=40
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# Interface that is connected to the 1wire bus
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USETTY=/dev/ttyUSB0
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# Location of the digittemp config file with data about the sensors
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DIGITEMPCONF="/etc/digitemp.conf"
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# Command to use for reading the sensors
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CMD="sudo /usr/bin/digitemp_DS9097"
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CMDOPTS=" -q -s $USETTY -c $DIGITEMPCONF"
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# Define sensors that should be queried
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# Format: [<Label>]=<Id>
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declare -A SENSORS=( [0]=LuftTemp [1]=WasserTemp [2]=BodenTemp )
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# Location where the readings should be stored
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OUTFILE="output"
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#
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# no configuration/changes should be necessary below this line
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#
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cd "$(dirname "$0")";
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touch "$OUTFILE" 2> /dev/null
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echo "Timestamp="`date +%s` > "$OUTFILE"
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if [ ! -w $OUTFILE ]; then
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echo "Error: output file '$OUTFILE' not writeable"
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exit 1
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fi
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function read_sensor () {
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OUTPUT=`$CMD $CMDOPTS -t $SENSORID`
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VALUE=`echo "$OUTPUT" | awk -F "C: " '{print $2}' | awk -F " F:" '{print $1}'`
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CNT=$(($CNT+1))
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}
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function check_output () {
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if [[ $OUTPUT =~ fail ]] || [[ $OUTPUT =~ owAcquire ]] || [ ${VALUE%.*} -lt $MINTEMP ] || [ ${VALUE%.*} -gt $MAXTEMP ]; then
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if [ $CNT -le $RETRY ]; then
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sleep $DELAY
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read_sensor
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check_output
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else
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echo "${SENSORS[$SENSORID]}=Error" > "$OUTFILE"
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fi
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fi
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}
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function write_results () {
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echo "${SENSORS[$SENSORID]}=${VALUE}" >> "$OUTFILE"
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}
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for SENSORID in "${!SENSORS[@]}"
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do
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CNT=0
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read_sensor
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check_output
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write_results
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sleep $DELAY
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done
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