As the owfs threads have been quiet for a while I hope you don't mind this
question about data gathering...I know this is really a scripting question
however thoucght someone might want to share there thoughts in how best to
scan lots of 1wire data to be shared between multiple scripts.
I just use multiple bash scripts at the moment, sometimes multiple scripts
read the same data via OWFS and it is getting harder to manage
Objective - I want to optimize the data gathering to be the fastest and
most reliable as possible thus decouple the data reading from the various
scripts I use. However If I optimize data reading (fastest possible) will
the DO get reliably sent. ? This is very important and should take priority
over reading data.
My Data
12 analog signals from 3 off DS2450 (quad A/D).. This gets sampled every 90
seconds and averaged with the last three readings. The 2450 is only 8 bits
and I need to average 4 samples to get repeatable readings .
4 counter inputs from DS2423 (dual channel counters) This data get read
every 5 minutes.No need to average
Digital I/O from 8 off DS2405/06 gets read every 2 seconds. (1 second would
be great)
Considerations
I use a Ubuntu server and use owread and owwrite, I do not use FUSE. I
understand FUSE could possibly assist however as I need to average and
provide calculations on the data to get it to engineering units, I cannot
use FUSE directly. The digital inputs are from push buttons and level
switches so I need to read uncached data. I use rrdtools to collect the
data.
Current thoughts
A dedicated read script shoving data into text files that the other scripts
can read,
Or
maybe setup ~30 system variables that the OWFS read script uses as storage.
I have never created system variables, I assume they are located in ram. Is
there any contention between multiple scripts reading from system variables
? Does anybody use this technique ? How best to handle writing to digital
outputs. ? Would another scripting language assist (i.e. perl)
cheers
rob
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