[rrd-users] help with NSLU2, OWFS and RRD for DS2423 counter

[Rob Conway]

Here is my read script (started life in a NSLU2 -no runs under ubuntu), once
started it loops every 90 seconds and uses a simple bash script.  Each
section has a description and you can see how to convert the counts into a
real number. See Accum_flow as the counts divided by 4100 = litres in my
case

 

 

 

#!/bin/bash

OWWRITE="/opt/owfs/bin/owwrite -s 3001"

OWREAD="/opt/owfs/bin/owread -s 3001"

AWK="/usr/bin/awk"

hwclock -s

echo "`date` -- 1Wire Data Collection Script Started -- "
>>/var/scripts/nohup.out

while true

do

 

###  Force Simulataneous 1wire conversion ###

$OWWRITE simultaneous/voltage 1

$OWWRITE simultaneous/temperature 1

 

### Read 1wire data and convert into engineering units #ph was 2.6667
offset was .3##

PH=$($OWREAD 20.022408000000/volt.A | $AWK ' {printf
"%4.2f\n",(($0-0.0)-1)/1.6+5.5 }')

US=$($OWREAD 20.022408000000/volt.B | $AWK '{printf
"%3.0f\n",(($0-0.0)*100)}')

ORP=$($OWREAD 20.022408000000/volt.D | $AWK '{printf
"%3.0f\n",(($0-0.0)*99)}')

TempAqua=$($OWREAD 20.022408000000/volt.C | $AWK '{printf
"%3.1f\n",(((($0-0.0)-1)*5)+20)}')

LITRES=$($OWREAD 20.952A05000000/volt.D | $AWK '{printf
"%3.1f\n",(($0-2.94)*62)}')

TempOut=$($OWREAD 28.11BF97000000/temperature | $AWK '{printf
"%3.1f\n",($0)}')

TempAmb=$($OWREAD 28.D70598000000/temperature | $AWK '{printf
"%3.1f\n",($0)}')

TempRes=$($OWREAD 28.A6EE97000000/temperature | $AWK '{printf
"%3.1f\n",($0)}')

Accum_flow=$($OWREAD 1D.EBEF0900000034/counters.A | $AWK '{printf
"%g\n",($0/4100)}')

 

### Out of Range Error trap -Do not log data ###

PHtest=`echo $PH |cut -f1 -d'.'`

if [ -z $PHtest ] || [ $PHtest -gt 8 ]; then

echo "`date` PH reading error $PH" >>/var/scripts/nohup.out

PH="U"

fi

 

ORPtest=`echo $ORP |cut -f1 -d'.'`

if [ -z $ORPtest ] || [ $ORPtest -gt 600 ]; then

echo "`date` ORP reading error $ORP" >>/var/scripts/nohup.out

ORP="U"

fi

 

UStest=`echo $US |cut -f1 -d'.'`

if [ -z $UStest ] || [ $UStest -gt 500 ]; then

echo "`date` Conductivity reading error $US" >>/var/scripts/nohup.out

US="U"

fi

 

TEMPtest=`echo $TempAqua |cut -f1 -d'.'`

if [ -z $TEMPtest ] || [ $TEMPtest -gt 33 ] ; then

echo "`date` Aquarium Temp error $TempAqua" >>/var/scripts/nohup.out

TempAqua="U"

fi

 

### Calculations based upon Data ###

C12=$($AWK -v PH="$PH" '{printf "%3.1f\n",((3*$0)*(10^(7-PH)))}'
/var/scripts/kh_value.txt)

Todayflow=$($AWK -v AF="$Accum_flow" '{printf "%g\n",(AF-$0)}'
/var/scripts/lastflow.txt)

Weekflow=$($AWK -v AF="$Accum_flow" '{printf "%g\n",(AF-$0)}'
/var/scripts/weekflow.txt)

 

 

### Push Data into NEW Trend Files ###

rrdtool update /var/www/rrd/aqua_ph.rrd N:$PH

rrdtool update /var/www/rrd/aqua_orp.rrd N:$ORP

rrdtool update /var/www/rrd/aqua_temp.rrd N:$TempAqua:$TempRes

rrdtool update /var/www/rrd/aqua_co2.rrd N:$C12

rrdtool update /var/www/rrd/aqua_cond.rrd N:$US

rrdtool update /var/www/rrd/aqua_level.rrd N:$LITRES

rrdtool update /var/www/rrd/weather_temp.rrd N:$TempAmb:$TempOut

rrdtool update /var/www/rrd/aqua_waterchange.rrd N:$Todayflow:$Weekflow

sleep 90

done

 

 

 

 

-----Original Message-----
From: rrd-users-bounces at lists.oetiker.ch
[mailto:rrd-users-bounces at lists.oetiker.ch] On Behalf Of Eduard
Sent: Tuesday, February 17, 2009 7:00 AM
To: rrd-users at lists.oetiker.ch
Subject: [rrd-users] help with NSLU2, OWFS and RRD for DS2423 counter

 

Are there users who are using RRD and OWFS with a NSLU2 ?

 

 I'm interested in how to update a RRD with data from a  DS2423 counter.
Does anybody have some working examples for me?

 

 

Kind regards,

Eduard

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