I am using an NSLU2 (Unslung 6.8), I currently use a simple bash script to
gather 8 off 1wire variables and do some calc's before storing the data in
trend files. I have it scheduled in crontab to run every 1 minute. What
happens is that about ~3 times a month the NSLU2 grinds to a halt. It seems
that my script somehow screws up and I just fill up the slug with scripts never
finishing. I think its because it cannot access the 1wire file system to read
the data...
Is this the best way to handle scheduling of scripts, using a 1 minute crontab
entry ?
I was thinking to just use a loop in a single script and just sleep for 60
seconds...that way if it does screw up at least the NSLU2 will continue to run.
I could have another script testing a "PID entry" to make sure its still
running and if not just restart it automatically.
I know its slightly off topic however was keen to see if other NSLU2 -1wire
users have implemented the same type of continuous monitoring and what their
maximum uptime was. The SLUG is lightly loaded and dedicated for data
monitoring with owfs, NTP, thhtpd, and rrdtool....I want to move onto relay
output control thus trying to sort this problem out for reliability before I
move into closed loop control.
owfs version as seen from #ipkg list_installed
owfs - 2.6p1-3 - 1-Wire filesystem (http://owfs.sf.net)
owlib - 2.6p1-3 - 1-wire library
fuse-utils - 2.6.0-pre2-3 - Fuse
################################################################
#!/bin/bash
### Force Simultaneous 1wire conversion ###
echo 1 >/tmp/1wire/simultaneous/voltage
echo 1 >/tmp/1wire/simultaneous/temperature
### Read 1wire data and convert into engineering units ##
PH=$(/opt/bin/awk '{printf "%4.2f\n",((($0-1)/1.6)+5.5)}'
/tmp/1wire/20.B71F05000000/volt.A)
US=$(/opt/bin/awk '{printf "%5.1f\n",($0*100)}'
/tmp/1wire/20.B71F05000000/volt.B)
TempAqua=$(/opt/bin/awk '{printf "%3.1f\n",((($0-1)*5)+20)}'
/tmp/1wire/20.B71F05000000/volt.C)
LITRES=$(/opt/bin/awk '{printf "%3.1f\n",(($0-2.900)*60)}'
/tmp/1wire/20.952A05000000/volt.D)
TempOut=$(/opt/bin/awk '{printf "%3.1f\n",($0)}'
/tmp/1wire/28.11BF97000000/temperature)
TempAmb=$(/opt/bin/awk '{printf "%3.1f\n",($0)}'
/tmp/1wire/28.D70598000000/temperature)
TempRes=$(/opt/bin/awk '{printf "%3.1f\n",($0)}'
/tmp/1wire/28.A6EE97000000/temperature)
Accum_flow=$(/opt/bin/awk '{printf "%d\n",($0/4100)}'
/tmp/1wire/uncached/1D.EBEF0900000034/counters.A)
### Calculations based upon Data ###
C12=$(/opt/bin/awk -v PH="$PH" '{printf "%3.1f\n",((3*$0)*(10^(7-PH)))}'
/public/kh_value)
Todayflow=$(/opt/bin/awk -v AF="$Accum_flow" '{printf "%d\n",(AF-$0)}'
/public/lastflow.txt)
Weekflow=$(/opt/bin/awk -v AF="$Accum_flow" '{printf "%d\n",(AF-$0)}'
/public/weekflow.txt)
#################################################################
cheers rob -Australia-------------------------------------------------------------------------
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