Recent Posts

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31
Weatherproofing / Opening the tight cap
« Last post by admin on August 17, 2016, 05:30:57 pm »
The weatherproof has a press-fit cap.

Sometimes a rubber mat or glove can be used to ease the loosening of the cap.

Also, putting the entire housing into the freezer and waiting for it to cool off may help to shrink the tube small enough to allow the cap to slip off easily.

Using rubber gloves, grab the bottom of the housing and twist the top cap off as shown below:



32
General Discussion / Re: The new world atlas of artificial night sky brightness
« Last post by admin on July 17, 2016, 12:43:01 pm »
And now, the atlas is in book format ...

A new book about light pollution around the world is now available. Fabio Falchi has done a tremendous amount on it, and many SQM users participated and provided their readings to help produce this book.

Here is a description of the book:
  The Light Pollution World Atlas is the most powerful tool to raise awareness the impact of this form of pollution around the world. The new version marks a major breakthrough in enabling people, governments, local authorities, researchers and industry to address this global challenge. After fifteen years, the second Light Pollution World Atlas shows a significant increase of artificial sky brightness across time and continents. We are facing the deterioration of a legacy with strong cultural, scientific, environmental, healthy and aesthetic repercussions. The time to act is now.

The book is available here:
  https://www.createspace.com/6182962
 
  https://www.amazon.com/World-Atlas-Light-Pollution/dp/1534642560

33
General Discussion / Flying SQM proposal
« Last post by admin on June 30, 2016, 04:47:26 pm »
This Astronomynow.com article discusses a project to mount an SQM onto a drone for large area coverage:

Using drones to keep tabs on light pollution
34
Connected meters (SQM-LE/LU/LR/DL) / 3D printed SQM-LE holder
« Last post by admin on June 21, 2016, 11:54:51 pm »
Dr So Chu-wing of the Globe at Night - Sky Brightness Monitoring Network (GaN-MN) has provided this SQM-LE and PoE holder 3D-print designed to fit into our weatherproof housing.



All the files, including assembly images, can be downloaded from here.

The design is Open license.



35
General Discussion / The new world atlas of artificial night sky brightness
« Last post by admin on June 13, 2016, 11:05:13 pm »
"This atlas shows that more than 80% of the world and more than 99% of the U.S. and European populations live under light-polluted skies."

Read the full paper with maps The new world atlas of artificial night sky brightness.

by Fabio Falchi, Pierantonio Cinzano, Dan Duriscoe, Christopher C. M. Kyba, Christopher D. Elvidge, Kimberly Baugh, Boris A. Portnov, Nataliya A. Rybnikova, Riccardo Furgoni
36
I am certainly no against doing such a thing, I just have to find the time and resources for it. It's on the plate.
37
Connected meters (SQM-LE/LU/LR/DL) / Observing Conditions interface in ASCOM 6.2
« Last post by Bkoch on May 22, 2016, 03:05:18 pm »
 Will support be added for the new ascom Observing Conditions interface in the near future? SGP users would find it beneficial. Thanks in advance.

 
38
Connected meters (SQM-LE/LU/LR/DL) / Raspberry Pi installation with PySQM
« Last post by admin on February 23, 2016, 02:12:19 am »
Rubén Díez Lázaro has come up with detailed instructions for installing PySQM onto a Raspberry Pi Single-Board_Computer:
http://rdlazaro.info/compu-Raspberry_Pi-unattended_SQM.html

PySQM can be found here:
http://guaix.fis.ucm.es/PySQM
39
Connected meters (SQM-LE/LU/LR/DL) / Re: Firmware updates
« Last post by admin on December 12, 2015, 01:37:46 am »
The "Retrieve-All" function sometimes contained spurious values during the retrieve process.

The following firmware update will fix (feature 36) that:
  For the SQM-LU-DL:
  http://unihedron.com/projects/darksky/cd/SQM-LU-DL/firmware/SQM-LU-DL-4-6-36.hex

  For the SQM-LU-DL-V:
  http://unihedron.com/projects/darksky/cd/SQM-LU-DL-V/firmware/SQM-LU-DL-V-4-11-36.hex

The firmware update does not affect the database records.

Please ensure that you are using the latest version of UDM to access any new features that have been added to the firmware:
  http://unihedron.com/projects/darksky/cd/
40
SQM-LU / Re: Extending the USB cable
« Last post by admin on November 23, 2015, 09:37:45 pm »
Recently a customer had problems with the IOGEAR GUCE51 device, but the GUCE62 device worked properly. There could have been issues of USB level (2.0 vs 1.0) or FTDI driver issues. We are now recommending the GUCE62 device for extending the SQM-LU meters.
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