klehman(at)albedo.net
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 Posted: Sat Apr 15, 2006 6:00 am Post subject: datalogging |
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Bob - As a matter of fact I do use a 486 windows95 laptop to talk to
cars and my airplane - which mostly thinks it is still a car  It
has a "normal" or "bidirectional" choice for the printer port but
doesn't specifically list an EPP choice like I have seen on other
machines. I may talk to you about the Base2 module after I get a chance
to look into my ignition situation some more. I'd happily find a USB
equipped machine if you develop a datalogging circuit or kit for that
however this prompted me to start searching a bit differently.
http://www.picotech.com/low-cost-data-loggers.html is interesting.
It looks like Pico offers a $100. parallel port device that may run
20kS/sec on the 8 bit version. (slightly slower on the 12 bit version)
It can dump to windows, Excel, (slowly) or DOS. I will study the manual
tonight for the sustained transfer speed and length but the biggest
obvious limitation seems to be that it is set up for 0 to 5 volt inputs
and would need some signal conditioning..
Thank you everyone who made suggestions. You fellows in the USA sure
have a tremendous advantage in availability and cost of "toys" compared
to us in Canada. Import costs are often prohibitive.
Ken
Robert L. Nuckolls, III wrote:
snip
| Quote: | The 1K of memory isn't a big restriction for capturing one screen
worth of data . . . but the task you've cited sounds like a
job for high speed data acquisition. One of my favorite tools of
yesteryear was a product by Base2 Electronics that ran off
the extended performance parallel port of a Win95 machine.
It would take 8, 12-bit samples 1000 times a second and throw
the numbers to a column delimited text file on the hard drive.
If I tied all 8 channels together, I could get 8000 samples
per second. I successfully chased a lot of gremlins out of
Beechjets with this tool. Unfortunately, the company didn't
upgrade to stay compatible with newer hardware and operating
systems and I've not found a single product that even approaches
the capability and low cost of that device ($125 with software).
I've discussed this project with my software guy (father-in-law)
and we're going to see if we can do a WinXP/USB version of this
product. In the mean time, I don't have any good recommendations
for you. If I run across something, I'll post it. Hmmm, got
an old laptop you could load Win95 on and has an EPP parallel
port? I think my Base2 Modules are laying around here somewhere.
I'm going to add a diode to the schematic for the OVPM
this weekend. Thanks for doing the legwork on this!
Bob . . .
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