Thoughts? Am I just dreaming?
Carl
Check out dallas 1wire sensors, I think its DS1821 from memory, you can
string a load of them on a single twisted pair over a fair length.You can
read them via the serial port of a PC, or a microcontroller.
For true wireless transmission check out license free 433Mhz
transmitter/receiver modules. I have used them over about 1km line of sight
successfully at low data rates.
I used the Quasar FM range.
You can get them in 868MHz too but they are normally shorter range.
Anthony
Their server wasn't on-line when I wrote this message, so you may want to check
it in a day or so.
cssw...@yahoo.com (Carl Swanson) wrote:
More about me: http://thelabwiz.home.mindspring.com/
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VB6 - MySQL how to: http://thelabwiz.home.mindspring.com/mysql.html
johnecarter atat mindspring dotdot com Fix the obvious to reply by email.
How about an LM335 (or 135, 235) precision temperature sensor?
http://www.national.com/pf/LM/LM335.html
Rather inexpensive as I recall. With just a resistor connected it can give
you an output linearly dependant on temperature. Just hook up a few of
these through a multiplexer or whatever to an A/D converter and read
through PC parallel port for instance.
--
Jem Berkes
http://www.pc-tools.net/
Windows, Linux & UNIX software
"Carl Swanson" <cssw...@yahoo.com> wrote in message
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Take a look at the USB interface DAQ system at
http://www.labjack.com/labjack_u12.html. It's a bit pricey at $119 US but
it will certainly do the job for you. All you would need to supply would be
the temp sensors, which, as Jem posts, will finish the system.
There are other DAQ systems available, at lower prices, such as the analog
input module at http://www.weedtech.com/ for $69.00 US. Again, all you need
to supply would be the sensors.
Both of the above DAQ systems come with software to get you started.
Search around on Google for 'analog data acquisition module' and see what
you come up with.
--
Tweetldee
Tweetldee at att dot net (Just subsitute the appropriate characters in the
address)
Time is what keeps everything from happening all at once.
--
Don Stauffer in Minnesota
stau...@usfamily.net
webpage- http://www.usfamily.net/web/stauffer
If you (or an interested friend) program in VB or VC++,
http://www.ultimaserial.com/ has an ActiveX control (shareware $25) that
provides even more features for the DI-194RS, including using the 2 digital
input lines as outputs. You could use these to control a switching matrix and
expand the 4 inputs to 16.
cssw...@yahoo.com (Carl Swanson) wrote:
More about me: http://thelabwiz.home.mindspring.com/
He had them brought out to the front of the computer to 1/8 jacks.
He had a festival of sensors, often in BIC pens, with wires
for those jacks. Temp, photo-resistor, photo-transistor, etc.
You WROTE to one location and read back a number between 0 and 255.
Kinda cool with the phototransistor showing black for 2/3 readings
working late at night. Couldn't find the bug with my program.
Of course it worked with him there the next day. Failed that night.
Then he said "Are you running it with the fluorescents on?"
Yes...
"well that's it. Fluorescents flash - it's dark in here much of the
time."
1Wire may meet your needs. LM34's and LM35s may too ( 0.1V/degree
C (lm34) or F (lm35)).
But a basic A/D and any thermistor will do.
I also have some RS-232 temp sensors from a while ago (wiztemp, RIP).
RJ45/RS232 can run FAR for these.
1wire is likely cheapest.
"Carl Swanson" <cssw...@yahoo.com> wrote in message
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"Rick Caldwell" <ri...@dallas.geoquest.slb.com> wrote in message
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No, not a dream. I would simply get a couple hundred feet of twisted
pair, could be telephone wire, or maybe even cheaper, thermostat wire,
since it's dealing with temp. Then solder a thermistor to the end at
the location where you want to monitor, and insulate with heat shrink.
If you use thermistors that are in the 30k to 100k range, they would
work as a replacement to the two pots in a joystick, which plugs into
the PC's game port. With two joystick inputs, that's four pots or
thermistors. Software would do the rest.
Here's another way of doing it with a serial port. But it's only good
for one thermistor. http://users.auth.gr/~mixos/projects/nopcb/pc/006/
There are other ways of doing it, you can find many systems for eneergy
management, HVAC, etc. It all depends on how much money you want to
spend.
> > Carl
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Take a look at iScape Monitrol kit:
You can measure as many temerature points as you like.
It uses RS485 network and DS1820 to measure temprs.
You can record 20k samples over time. And It doesn't
cost you much.
Michael
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http://www.brianlane.com/ds1820-report.pdf
Hrvoje wrote:
Edward Cheung
http://www.edcheung.com