NetNews Usenet Archive 1992 #18/NN_1992_18.iso/spool/sci/electron/14463

Text File | 1992-08-17 | 1.6 KB | 42 lines

Newsgroups: sci.electronics
Path: sparky!uunet!sun-barr!cs.utexas.edu!torn!cunews!nrcnet0!cu23.crl.aecl.ca!news
From: [e-mail]
Subject: data logger & laptop power req.
Message-ID: <[e-mail]>
Sender: [e-mail] (USENET News System)
Nntp-Posting-Host: cpd3.crl.aecl.ca
Organization: AECL Research
Date: Mon, 17 Aug 1992 14:24:47 GMT
Lines: 30

I have two questions.

First, I am tring to design a low power data logger. The inputs are four
logic levels. The processing and output requirments are, on every
transition of any input I have to timestamp it an record it's level and
the timestamp. Once a day a laptop computer will request all of the data
to be transmitter via RS232. The power requirments are it must run on
UPS/batteries for 24 hours a day for 100 days.

I have been considering a small micro controller running at a low clock
speed. This way I would have less design. Does anyone have any suggestions
on this idea or for an alternate design?

The second question is, What is the voltage and current drawn by
laptops/notebooks running full out with disk access and when in sleep mode.
General ideas as well as specific examples would be help full. I am going
to try and stay with the bigger name brands Compac, Epson, IBM, etc.

Oh, and if anyone knows about the enviromental specs. of laptops/notebooks
I am looking for them to withstand 0-55 degrees celcius and 95% humidity.
Is this a dream or are they available?

I have a tight deadline so if anyone can help please contact me or post
as soon as possible.

Thanks,
Tim
[e-mail]