[Weather] NSLU2 (SLUG) and the 1wire Weather Stations (David Bray)

[Ernie Oporto]

I have an NSLU2 for my 1-wire weather station running OWW from
oww.sourceforge.net.  I agree, this is the perfect solution for having a
small, quiet system!

I have the serial to 1-wire adapter connected to a serial to USB adapter
going into one of the two USB ports on the NSLU2.  The other USB port holds
a little 512MB flash drive that keeps the OS - all logs are written to
memory, so there is no danger of killing the flash with frequent writes.  I
then use OWW to post to Wunderground and Citizen's Weather Observer
Program.  If only this could be solar powered, it would be perfect.



On 10/10/06, David W. Bray <dbray at twcny.rr.com> wrote:
>
> I have been running a 1-Wire weather station on a Linux PC for several
> years. This summer I converted it to a NSLU2 running Unslung 6.8.
> It is running the same source as the Linux PC, just recompiled on the
> SLUG with a few directory/file name changes.
>
> My setup is as follows:
> 1) I have a 512MB USB flash stick as the only drive, and 1 USB to RS232
> port.  I still have 70MB free on the stick.
> 2) I set up a ramdisk for the weather station -- both program and data
> storage.  So there is minimal use of the USB flash.
> 3) The program collects the data and stores it in the ramdisk (shared
> memory) for all applications that want it.
> 4) Another application runs via crontab every 1/2 hour to send required
> data to two different websites -- Wunderground and my own.
> 5) Also when the data is sent to the web sites it writes a log file to
> normal flash stick storage. So if power is lost the log is safe.
> 6) I installed appWeb (web server) on NSLU2 and have a php web
> application to display the data upon demand. It uses the share memory
> data to draw graphs etc.
> 7) Another php application which will create a WAP html page upon demand
> from my cell phone.
>
> All of the 1-Wire sensors that I have for the weather station are on the
> one 1-Wire line.  I have a second set of 1-Wire sensors that are
> currently read by a TINI. Some time in the future I will put these on a
> NSLU2. If the NSLU2 Unslung will support 2 USB to RS232 ports (which I
> hope can be done with a USB HUB) I will write another application to
> replace the TINI, and it will run independently as a background process
>   concurrently with the current weather station process.  This will be
> nice since then all of my 1-Wire data will be shared on the same device
> in the same shared memory.
>
> The SLUG with Unslung Linux is a wonderful, little, quite, low power
> consumption computer for 1-Wire applications!!!
>
> So my vote for Push or Pull is neither!  Just use the SLUG.
>
> --David Bray
>
> weather-request at buoy.com wrote:
> > Date: Thu, 5 Oct 2006 17:56:48 -0400
> > From: "Paul Davis" <pdavis at mrv.com>
> > Subject: [Weather] NSLU2 (SLUG), OWFS vs OWHTTPD, owwnogui,   and the
> >       1wire Weather Stations
> > To: "List for 1 Wire Weather Stations and devices" <weather at buoy.com>
> > Message-ID:
> >       <81EF3F1352B56B4A8C6CD53DBC06F3BF9F67FC at bosmail.BOS.int.mrv.com>
> > Content-Type: text/plain;     charset="us-ascii"
> >
> > I'm soliciting input from others on the list that have been using the
> > LinkSys NSLU2 (SLUG) for 1wire operations.
> >
> > I've finally got my SLUG operational (unslung 6.8) and de-underclocked.
> > Now I'm mulling over different ideas on how to pull the weather station
> > (and other 1wire) data from my SLUG and do something useful with it. I'm
> > wondering if anyone else is using the owfs/owhttpd approach, or if you
> > are all using owwnogui. I'd be interested in the reasoning for your
> > decisions regarding one vs. the other.
> >
> > In my case, I have more devices to monitor than just the weather station
> > and associated sensors, so I opted for owfs. I still have to determine
> > whether it's better read the values from owfs and push the data out to a
> > data collection/processing server OR to pull the data from the SLUG
> > remotely via owhttpd.
> >
> > My aim is to have the SLUG be a low power data collection system for the
> > 1wire sensors and I'm not doing any local data storage. It's running off
> > a 1GB usb stick, so I do have room for other programs, web pages, etc.
> > but I do not want to use it for storing 1wire data. The 1wire network
> > consists of various branches connected through a single hub and then to
> > the USB 1wire adapter on the SLUG.
> >
> > So what do you guys think? Push or pull?
> >
> > Paul
>
> --
> David W. Bray
> E-mail: dbray at twcny.rr.com
> Home Pages: http://davidbray.org
>
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>



-- 
Ernie
http://www.shokk.com/blog/
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