Data logger question

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I've got a stand-by generator for the house and I'd like to be able to keep
track of
the DATE(s) and TIME(s) when it is operational. When the gen was installed,
I had
a power meter installed in a supply closet to keep track of the KWH's
generated, so
from that, I can tap into a 120v line for power for whatever I use as a
logger.

TIA for any suggestions.
thinman



Re: Data logger question
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Adjust a 'time delay relay' in 'interval time delay' mode
to pulse it's contacts for say three seconds every time
A.C. power is detected from the generator.
Adjust a second relay in 'delay on operate' mode to pulse
it's contacts for a second, starting two seconds after A.C.
power is detected from the generator.

Connect the contacts of the first relay across the
'half press' contacts of a digital camera focused on
your kWH meter.  Connect the contacts of the second
relay across the 'full press' contacts of that
same camera.  Power the camera from a high capacity
battery pack that is charged from house A.C.

Viola!  A set of pictures of your kWH meter showing
the date and timestamp each time it started.
Derive 'run time' by subtracting the kWH readings.

I've not used any of these products.
This is just one example of the parts I'm on about.
http://www.dareelectronics.com/products/time-delay-relays/default.html

--Winston

Re: Data logger question
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first you need a data logger, find one and post the specifications.
Hooking it up to your setup should be fairly easy.

--
⚂⚃ 100% natural

---

Re: Data logger question

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When you picture this in your mind, what do you see?

There are so many approaches to this. Some multimeters and scopes have
built-in data loggers. You can buy commercial/industrial data loggers.
If you're in the mood, building a custom setup would be fun. Say, with a
microcontroller with an internal RTC, a serial EEPROM for logging, maybe
a salvaged paper tape printer for a "human readable" record, with a
keypad and character LCD display. Or, go with quarter VGA touchscreen or
push it up to a full iPAD display with a web server. Have it estimate
the amount of fuel remaining and automatically place an order or at
least send you a text that it's getting low.

Maybe this will do what you need?
<http://www.dataq.com/products/hardware/el-usb-data-loggers/el-usb-5-data-logger.html

--
Rich Webb     Norfolk, VA

Re: Data logger question
On Sun, 04 Sep 2011 08:10:47 -0400, Rich Webb

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That one looks good, but if you're willing to learn BASIC programming
and do a little soldering up can build a datalogger that meets your
exact requirements.  The PICAXE series of microcontroller chips are
cheaper than the BASIC Stamp ($10 vs $50), have similar capabilities,
and have a very active forum:
http://www.picaxeforum.co.uk /

Search for datalogger and you'll find numerous threads.  

Some of the datalogger designs use a micro-SD card, so you could have
years of data stored on a 1 GB device.

John

Re: Data logger question
On Sat, 3 Sep 2011 19:17:46 -0500, "scsisys"

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This may be overkill for your project, but if you have a PC
with a sound card you can turn it into a simple data logger
using my Daqarta software.  See "Data Logging" at
<http://www.daqarta.com/dw_oo0o.htm

The example macro there reads the frequency of the line
input (at whatever time interval you specify via the
WaitSecs command) and appends it to a text file along with
the current time using the LogTxt command.  You can add the
data as well via a slight modification:

LogTxt=Freq+p20+t+p40+d

This reads the Daqarta Frequency Counter and puts the freq
first, the time at column 20, and the data at column 40.

You can get log voltage as well, using the same basic idea
with the Volts command to read the Daqarta Voltmeter:

LogTxt=Freq+p20+Volts+p40+t+p60+d

You'll need a little transformer that isolates the sound
card from the AC line.  An old AC "wall-wart" (maybe from a
discarded cell phone charger, etc) should be fine.  The
sound card input is AC coupled and can handle about 1 Vrms,
so you will also need a simple voltage divider on the output
of most transformers.

One money-saving tip:   Daqarta has a free 30-session/30-day
trial period, during which all features are active.  That
should be plenty of time to get the above system working
(contact me if you need help with that).  After that you can
keep the system working with a US$29 Personal / Hobby
license, but you will lose the ability to save new macros
unless you have the US$99 Pro license.  So the tip is to
create several macros during the trial period, with various
settings that you might need in the future (like different
time intervals between data points).  That way, you can get
by with the $29 version and will still be able to choose a
macro with the settings you want, even though you can no
longer create totally new macros.

Best regards,


Bob Masta
 
              DAQARTA  v6.02
   Data AcQuisition And Real-Time Analysis
              www.daqarta.com
Scope, Spectrum, Spectrogram, Sound Level Meter
    Frequency Counter, FREE Signal Generator
           Pitch Track, Pitch-to-MIDI
          Science with your sound card!

Re: Data logger question
On Tue, 06 Sep 2011 13:10:43 GMT, snipped-for-privacy@daqarta.com (Bob

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Oops!  Should have said "add the date", not "data" there.

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Again, should have been "date at column 40".

Sorry for any confusion...


Bob Masta
 
              DAQARTA  v6.02
   Data AcQuisition And Real-Time Analysis
              www.daqarta.com
Scope, Spectrum, Spectrogram, Sound Level Meter
    Frequency Counter, FREE Signal Generator
           Pitch Track, Pitch-to-MIDI
          Science with your sound card!

Re: Data logger question
Hi, thinman.

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This is not an answer to the questions as posed, but if you could
live with elapsed runtime rather than timestamps you could simply
hook up an elapsed time hour meter like this one to your AC output:

  Hour Meter, 120 Vac, 99999.9 Hours
  http://www.grainger.com/Grainger/CRAMER-AC-Voltage-Hour-Meter-6X139

Hope this helps.  My father and I hooked one up to my oil furnace
some years back to track my fuel consumption.


Frank McKenney
--
  "I can't change the direction of the wind, but I can adjust my
   sails to always reach my destination."   -- Jimmy Dean
--
Frank McKenney, McKenney Associates
Richmond, Virginia / (804) 320-4887
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