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Connected meters (SQM-LE/LU/LR/DL) / Windows task scheduler: start/stop recording
« Last post by admin on August 14, 2017, 10:22:55 pm »
In Windows, you can use the Task Scheduler to start and stop recording.

First make sure that UDM can read your meter and can log data using the Log Continuous feature.
Also, use UDM to determine the MAC address of the meter (on the main page).
Then, close UDM.

Enter the start/stop times into the Windows Task Scheduler. Start the task scheduler as follows:
  • Click the Windows "Start" button
  • Start typing Schedule Tasks
  • select the Schedule Tasks or Task Scheduler program.

Other ways to get to the Task Scheduler are shown here:
https://www.isunshare.com/windows-10/4-ways-to-open-task-scheduler-on-windows-10.html
  • Press "Create basic task" on the right side in the Actions window.
  • Name: Start UDM
  • Next
  • Daily
  • Enter the desired start time
  • Select Start a program
  • Click on browse to find the program which is usually located at C:\Users\User\AppData\Local\Programs\Unihedron\udm.exe
  • Enter additional parameter: -SEM,x -LCMS,y -LCR
     where x is the MAC address of the SQM-LE to be monitored, for example: 00204AAF20A2
     where y is the number of seconds between recordings, for example: 10
  • Next, Finish

Tasks may not show up in the Task Scheduler library immediately, you may have to close the Task scheduler and re start it.

Then, make another task to stop UDM at a specific time as follows:
  • Press "Create basic task" on the right side in the Actions window.
  • Name: Stopt UDM
  • Next
  • Daily
  • Enter the desired stop time
  • Select Start a program
  • Type the following ointo the program area: taskkill
  • Enter additional parameters: /IM udm.exe /F
  • Next, Finish

The logged files are stored in your log directory, usually located at: C:\ProgramData\Unihedron\logs

The above was tested with Windows 10 and UDM ver.105.
2
Connected meters (SQM-LE/LU/LR/DL) / Re: GPS integration
« Last post by admin on August 03, 2017, 07:04:51 pm »
To get the Comm Port for Windows 10 and the GlobalSat BU-353 GPS:
  • Click the Start button
  • Click the Settings button
  • Click Devices
  • Click Connected devices
  • The GPS should show up there as "Prolific USB-to-Serial Comm Port (COMx)"
  • Note which Comm port is listed, mine happens to be COM5

Start up UDM, then:
  • Make sure you meter is selected
  • Select Log Continuous
  • Select GPS tab
  • Enter the Comm Port into the Port: field, in my case I just typed in COM5
  • Click the Enable Check box, and then you should see some green indicators.
  • If the Validity indicator shows "Warning", then you may have to wait while the GPS collects enough information from the satellites. This happens faster if you are outdoors.
  • If your location appears in the Latitude and Longitude fields, then everything is ready to start logging.


To get the Comm Port for a Mac and the GlobalSat BU-353 GPS:
  • Follow the instructions provided on the CD provided with the GPS
  • Connect the GPS
  • Open a text terminal
  • cd /dev
  • ls -altr  to look for the most recently created file that looks like tty.usbserialx
  • The newly connected GPS is located at file /dev/tty.usbserialx
  • In UDM->Log-continuous->Port:, type in that filename. For me it was: /dev/tty.usbserial5
  • Click the Enable check box, and then you should see some green indicators.
  • If the Validity indicator shows "Warning", then you may have to wait while the GPS collects enough information from the satellites. This happens faster if you are outdoors.
  • If your location appears in the Latitude and Longitude fields, then everything is ready to start logging.


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SQM-LU-DL (Datalogging light meter) / Re: Firmware updates
« Last post by admin on April 26, 2017, 02:38:44 pm »
New firmware released, see top post for details.

Some features of the new firmware are not supported on the old version of UDM, so make sure to update UDM as well. The latest version can be found here: http://unihedron.com/projects/darksky/cd/

Specific problems may include no apparent readings gathered under battery power. Using the latest firmware version allows retrieval of those gathered readings.
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Problem:Microsoft Edge cannot find UDM software on the CD. Error "Can't reach this page".
Cause:Microsoft Edge has protections in place to hide file lists on remote drives.
Solution:Use the File Manager to navigate the CD to the Windows directory then install from there. Or, get the latest Windows version of UDM from the Unihedron website:
unihedron.com/projects/darksky/cd/Windows/
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SQM-LU-DL (Datalogging light meter) / Real Time Clock enhancement
« Last post by admin on April 15, 2017, 11:10:49 am »
One of the drawbacks of using a real time clock (RTC) in electronics is that temperature variations will make it gain or lose time over long periods of time. The real time clock (timekeeper) inside out our original data-logger used a standard watch chip that had an accuracy of +/- 20 ppm. Generally this is not such a big problem, but for multiple data-loggers in different temperature conditions, the clocks will drift apart and other techniques are required to synchronize the readings.

We introduced an "Extremely accurate" RTC into the data-logger product line last year (around 2016-03-24) with an accuracy of +/- 3.5ppm from -40C to +85C.

The new RTC is identified on the back of the meter with the model number suffix "-R1" as:
  SQM-U-DL-R1
This model number can also be found using our UDM software.
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General Discussion / Re: Reports
« Last post by admin on April 04, 2017, 11:40:02 pm »
Here is an interesting report about a telescope mounted SQM-LE and the trials and tribulations of a long term study of sky brightness:
Quantifying and Monitoring Darkness over the RAO (Rothney Astrophysical Observatory)
by Phil Langill and Benjamin George
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Connected meters (SQM-LE/LU/LR/DL) / Re: Observing Conditions interface in ASCOM 6.2
« Last post by admin on March 12, 2017, 04:44:23 pm »
I just purchased an SQM-LU and use SGP and would like to add my vote to this request's position in the list of upgrades... :)

Acknowledged ;)
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I just purchased an SQM-LU and use SGP and would like to add my vote to this request's position in the list of upgrades... :)
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General Discussion / Re: Applying for Dark-Sky Park status
« Last post by kyba on March 07, 2017, 02:11:15 pm »
If you're going to use the SQM to document your dark sky Park or Reserve, please please PLEASE report your observations to Globe at Night, or else submit your observations using the Loss of the Night app.

Globe at Night: https://www.globeatnight.org/webapp/
Loss of the Night app: http://lossofthenight.blogspot.de/2015/01/brief-introduction-to-loss-of-night-app.html

That automatically archives the data for your park, it makes it accessible for scientists (like me), and your data will be visible to everyone at www.myskyatnight.com

It is very valuable for helping to track how the night sky is changing, and guarantees that your data will never be lost. If you have data from previous years that you would like to share with Globe at Night, you can contact them by email, and if your data is in an excel sheet or csv file, they will be able to add it to the international database.
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General Discussion / Applying for Dark-Sky Park status
« Last post by admin on March 07, 2017, 01:36:16 pm »
The SQM has been used extensively for gathering data to help apply for Dark-Sky Park Status with the International Dark-Sky Association (IDA).

Many people have applied to the IDA for a Dark-Sky park status including Georgia MacMillan of the Galway-Mayo Institute of Technology of Ireland. Her extensive research and work on this topic can be found in these two documents which may be helpful to others pursuing the same goal:
  • Dissertation PDF: Preserving our Night-time Skies, An exploratory study on the impact of light pollution and the potential for a new dark-sky site in County Mayo, Ireland. by Georgia MacMillan.
  • Application PDF: An Application to the International Dark-Sky Association for Ballycroy National Park and Wild Nephin that are included in the application for Mayo Dark Sky Park status.


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