Hi,
It depends on the rate of change and response that you need.
You mentioned real time, so I assume you need something close to analog
control gear in terms of response time.
In a closed system (that is, you know how big it will get, it won't get any
more inputs/outputs in its lifetime), you can calculate what sort of
response time you will get if you have one monitor for several inputs,
assuming all inputs are changing.
In a variable system, where you are adding or removing i/o, you may be
better served with a 1:1 relationship between input and monitor.
This becomes more critical in the case of safety control systems, but is
less of an issue if it is just the garden lights.
For control and feedback mechanisms you might want to brush up on some
control theory and maths if you want to avoid oscillatory systems.
Sorry I can't advise you on free tools; my control systems were in
microcontroller assembler or C (many microcontrollers come with A/D and D/A
converters), but I think you could get away with 'dd' from the command line
if your device has a driver...
Cheers,
Jill.
-Original Message-
From: Richard Hayes [mailto:[EMAIL PROTECTED]
Sent: Wednesday, 20 July 2005 6:31 AM
To: slug@slug.org.au
Subject: [SLUG] [OT] What tools for an automatic control system
Dear list,
I am thinking about creating an automatic control system.
The main purpose is to maintain an established relationship between say,
temperature and pressure.
E.g. If the temperature is too high, reduce pressure
There will be a number of real time data feeds.
1. Would it be better if each data feed / sensor had it own independent
'agent' / servlet to monitor its function or is a single integrated
system to monitor all the sensors?
2. What free tools exist to monitor systems?
Any other suggestions.
--
Richard Hayes
Nada Marketing
PO Box 12 Gordon Australia 2072
Tel: +(61-2) 9412 4367 Fax: +(61-2) 9412 4920 Mob: +(61) 0414 618 425
www.nada.com.au
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