meteohub.de

Hi, I'm going through installation and having a problem at the last step. I see the NSLU2 and it's IP (192.168.1.77) on the network through my router's web interface, but when I go to that IP in my web browser I get a Page Load Error (Firefox):

Though the site seems valid, the browser was unable to establish a connection.

When I used DiskImage on my USB stick (OCZ Rally2 4GB), I did not see Physical Disk as an option. I attached what I do see. Could this be the problem?

Thanks
wdg

Ok, I'm getting somewhere now. First off, I decided to start all over with the USB stick so I formatted it. I then started with DiskImage again but still only have the one choice which did not say "Physical Disk". I then thought, damn, may be a Vista thing. Sure enough, I ran DiskImage again, but this time opened it with admin privs and bam, I could see all disks including physical disk from the drop down. Bad news is that the write failed at sector 0!

So then I said, hell with Vista, let's try my XP machine. Worked like a charm. I'm going to call it a night and try the rest of the Meteohub installation tomorrow. I just wanted to post this in case others have problems.

I started with an OCZ Rally2 and then the drive became corrupted after about two months of use. The files on it can be read and I haven't really found what was corrupted. I may erase it, test it for bad bits, and re-use it for other purposes.

I replaced it with an OCZ Rally2 Turbo. I'll be interested in how well your drive works for you.

Yeah, I'll let you know if my Rally2 goes out any time soon. Right now I have everything working and looking fine. Vista was the headache I had to get past.

Which weather station are you using?

VP2 and a solar sensor to an Envoy-WLIP. I also have a neighbor's ISS monitored as a Temp/Hum station to compare to my results. The temperature differential between his station and mine gives a rough measure of the night time cloudiness if the wind is blowing less than a slight breeze.

Nice setup, I like hooking up to your neighbor's sensors, lol. Are the cloud measurements pretty accurate?

Also, did you use the Davis WeatherLink software before Meteohub?

It's just a very semi-quantitative estimate of night time cloudiness and it only works when there is little or no wind. Wind causes turbulance that roils up the near ground temperature stratification.

So on dry, calm nights with absolutely no clouds, I might have a 10 degree F temp difference (colder) with the neighbor's station. His is mounted 20-25 feet up on a garage roof and mine is only 6 feet up above the ground. If the night is completely cloudy the difference may only be a degree or less colder. Normally it ranges from 3-5 degrees difference.

If I had an independant measure of percentage cloudiness, I might be able to calibrate the temp difference to cloudiness.

I used and still use the WL software to keep all my weather data records. The Meteohub acts more as a server for uploading to weather web sites.

d_l wrote:It's just a very semi-quantitative estimate of night time cloudiness and it only works when there is little or no wind. Wind causes turbulance that roils up the near ground temperature stratification.

For night time cloud I use the temp difference between my main outdoor temp and a "temp in a jar" sensor. The temp in a jar was originally set up for daytime solar, but with small refinements of design it also acts as an 'black body' at night.
In fully overcast night time conditions the two temps are the same. In fully clear conditions the jar is 1.4 C cooler.
The system is quite sensitive and works well. :cheer:

skyewright wrote:

The temp in a jar was originally set up for daytime solar, but with small refinements of design it also acts as an 'black body' at night.
In fully overcast night time conditions the two temps are the same. In fully clear conditions the jar is 1.4 C cooler.
The system is quite sensitive and works well. :cheer:

Do you have some way to convert that temperature difference into a degree of "cloudiness" measurement within the Meteohub?

d_l wrote: Do you have some way to convert that temperature difference into a degree of "cloudiness" measurement within the Meteohub?

Not in Meteohub, but I do in Weather Display (which I feed with data collected by Meteohub). :cheer:

WD "understands" the night time cloud sensor (and the temp in a jar solar for daytime). It allows the difference for overcast and clear to be configured, then converts the observed difference into one of 5 different phrases (based on a linear scale). The phrases are configurable, the defauults being "Overcast Night", "Mostly Cloudy Night", "Cloudy Night", "Partly Cloudy Night" and "Clear Night".

For a web page it would not he hard to achieve something similar with PHP (or even javascript?).

If anything I'd say that the night time cloud sensor is "better" (more precise) than the Temp in a Jar solar, because to get a solar percentage from Temp in a Jar the temperature range needs tweaking through the year, but with the night time cloud sensor once the maximum range has been established it seems to be stable.

skyewright wrote:Not in Meteohub,

PS. Though it is possible to use Meteohub's maths functions to display the raw temp difference, e.g.

Diff: {math- [actual_t8_temp_c] [actual_th0_temp_c]}