Very demanding. Most of the people I've talked to in this line of work (snowmaking tech) that have military experience say the army was like a stroll in the park. check out the Killington Mountain, Vermont, USA interview on YouTube to see what its like. as a matter of transmitters, I most likely will have to use radio because in real-world applications, the receiver can be 10,000-20,000 feet away from base in a highly mountainous region with a ski slope 6,000 vertical feet above the valley floor. Thanks for the help and options. ill be looking into the radio options.jbeale wrote:If you have line-of sight to your remote unit, and are willing to use a high-gain (directional) antenna at your base station that you can aim at the remote, then I think you can still use wifi: https://en.wikipedia.org/wiki/Long-range_Wi-Fi
On the remote end maybe a simple small unit is still OK. This is the best one of the few I've tried with the R-Pi (I have not used it long-range or outdoors though): http://www.tp-link.com/en/products/deta ... N822N.html I don't know as it's water-resistant, works below freezing or anything like that.
It sounds like a very demanding environment and for reliability you may have to use real industrial radios designed for harsh environments, would cost a lot more than consumer stuff of course.
jeez, you got knowledge on these things. Ill definitely check it out. its important that they have long range, because they may be MILES apart. the largest resorts have a distance of 6 miles between their base and outermost guns. -40 is a magic number too, because at -38 it actually becomes too cold and dry for snow to fall, or be made for that matter. Thanks for the help!sommersoft wrote:Second time in two days I get to recommend this. I'm really just living vicariously through you guys....I'll get around to playing with it eventually myself.
Decided to dig a little deeper. There are plenty that will go 1/2 a mile LOS (or 40 miles...in case you want to run a machine on a different mountain..range). The 900MHz models seem to be the ones you'll want, although they are more expensive and you'll need two. An added bonus: Operating Temps are -40 - 85 degrees C (humidity ratings aren't readily available; wrap it in dessicant). They even have gateways, so you can network them even further. It seems one of their target markets is Wind Power. Seems a pretty good match to your needs.
This guy has a pretty good RPi + XBee writeup.
http://www.brettdangerfield.com/post/ra ... r_project/
Nah, not really. I just read datasheets quick. I also have a touch of ADD when it comes to projects, so I start running around getting lost in reading what/how I can add things. It generally results in little getting finished.Skipoint0 wrote:jeez, you got knowledge on these things. Ill definitely check it out. its important that they have long range, because they may be MILES apart. the largest resorts have a distance of 6 miles between their base and outermost guns. -40 is a magic number too, because at -38 it actually becomes too cold and dry for snow to fall, or be made for that matter. Thanks for the help!
Up and down trails every 1-48 hours. check out image searches of downhill ski maps to see what the area for larger resorts can be like. i have a snowmaking system now, but water and air control are totally manual, so long distances means long travel, even for a seemingly unnoticeable temp change. better snow because of accuracy is what im looking for.mikerr wrote:Also look at Unifi stuff:
I've had 5Mbps at 10km with nanostation M5s,
very easy to setup.
How often does the "mobile" station move?
So, the Pi may not work all that well at -38C; one of those critical points I assume you'll want it to (if T < -38 then shutdown).8. What is its operating temperature?
The Raspberry Pi is built from commercial chips which are qualified to different temperature ranges; the LAN9512 is specified by the manufacturers being qualified from 0°C to 70°C, while the AP is qualified from -40°C to 85°C. You may well find that the board will work outside those temperatures, but we’re not qualifying the board itself to these extremes