On Thursday 02 May 2013 09:56:53 Kent A. Reed did opine: > On 5/2/2013 6:18 AM, andy pugh wrote: > > On 2 May 2013 05:47, Bruce Layne <[email protected]> wrote: > >> I'm looking for a robust method to connect a LinuxCNC device to a > >> WiFi network. > > > > Why WiFi? assuming that your LinuxCNC machine is powered by the mains, > > you might find Homeplug to be a more robust, simpler, solution. > > http://www.amazon.com/ZyXEL-HomePlug-Powerline-Wall-Plug-Adapter/dp/B0 > > 03ULOZ5W/ref=sr_1_2?ie=UTF8&qid=1367489806&sr=8-2&keywords=homeplug > > For example. > > > > I actually use > > http://www.amazon.com/Linksys-Powerline-Network-Adapter-PLSK400/dp/B00 > > 6JG5S6U/ref=sr_1_11?ie=UTF8&qid=1367489806&sr=8-11&keywords=homeplug > > To connect the 2 LinuxCNC machines and an IP camera in my garage > > To quote Yogi Berra, "it's Déjà vu all over again." I remember > suggesting what was then nearly proprietary powerline networking back > when IIRC Gene was talking about stringing Ethernet cable to his > workshop. Since then it's gotten faster, better, cheaper, and has an > industry association that has greatly improved interoperability of > different vendors' products. I prefer it for interconnecting hubs in > several parts of the house, using WiFi only for my mobile devices. > > Just to remind folks, though, the original poster's problem isn't > LinuxCNC, it's the underlying ancient Ubuntu 10.04LTS and 2.6.x kernel > we use to deliver LinuxCNC. One can backport drivers for more recent > WiFi adapters but it takes a certain amount of savvy. > > Regards, > Kent
One other item that might be worth mentioning is that the wired latency seems to be much better than wireless. I had bought a WNA-3100 USB dongle for my laptop since it came with a BCM4320 radio, which even the windows drivers couldn't make work more than 10% of the time, and used ndiswrapper to wrap the netgear supplied on a cd drivers work. But if I ssh'd into the mill or lathe, it always seemed as if my axis display was about 3/4 second behind what I could hear the machine doing. Just enough to make me nervous. Then, for an experiment last winter, I installed Mint 14 on the lappy, which is the xfce based distro, essentially Xububtu for resource challenged boxes as it a 1GB of dram, 1.4GHZ turion cpu, single core. Cute little running, well fed mouse for a logo. :) No builtin support for that dongle either so I just plugged in a cable & since wicd was helpless I killed it, and set it up as a fixed ip using a host file like all the rest on my home network runs on. Mint 14 uses a 64 bit kernel, GNU/Linux 3.5.7-xenomai-2.6.2.1 x86_64 as the default kernel. There is not now an easily detectable lag between what I see on the axis display, and what I hear the machine doing. Some of course but not noticeably greater than that atom boards own display has. It also seems to be getting updates at a rate similar to the other 2 10.04-4 installs on the atom boxes, which is encouraging. Now, if those two installs were the same, why is one atom pulsing the HD led at 1/sec, and the other is not? The newer atom running the lathe does this, the older one on the mill does not. Supposedly identical boxes, supposedly installed from the same cd. Me goes off scratching head. The newer box on the lathe is also not as stable, I often find it crashed and have to reboot it when I go out to do something in the shop's shed. The one on the mill runs from power failure to power failure. My UPS I was using out there died, needing yet another set of batteries, which would be its 5th set, and I've not replaced them yet. A Belkin monster 1500WA that has never learned to live with nut, I'll replace the nameplate with one that says APC in due time. :) Ditto for the one under this desk, its now used up its 3rd set of batteries and it shut down about 15 minutes after a failure 2 weeks ago, having to run only the cable based telephone & cable modem as I had done a graceful shutdown of this box and monitor as soon as it happened. I 'won' that 1hp kit, a 9 amp motor and controller, so that should be here in a week. RPMS aren't stated on the nameplate so who knows. Then I suppose I'll have to invent a shoehorn to get it in there, or perhaps make a Rube Goldberg jackshaft. Its probably asking for way too much but it would be very nice if the toothed pulley from the existing motor could be made to fit its shaft. It has a few degrees of rotational play on the existing motors shaft, retained by a small tru-arc ring. I am guessing its a D- flatted bore but it could be a 3mm key. The motor shaft looks like maybe 7mm at most. Beyond that, I am just guessing till it falls off the truck and I have a good excuse to turn the toolbox around that I put it on 2 months ago when the $10 yard sale kitchen base cabinet I had it on ripped out its drawer mounts. The sheet metal shield is still covering the OEM motor so I haven't a clue how its mounted. Your weekly report from Lake Woebegon WV. :) Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> is up! My views <http://www.armchairpatriot.com/What%20Has%20America%20Become.shtml> Any sufficiently advanced technology is indistinguishable from a rigged demo. -- Andy Finkel, computer guy A pen in the hand of this president is far more dangerous than 200 million guns in the hands of law-abiding citizens. ------------------------------------------------------------------------------ Introducing AppDynamics Lite, a free troubleshooting tool for Java/.NET Get 100% visibility into your production application - at no cost. Code-level diagnostics for performance bottlenecks with <2% overhead Download for free and get started troubleshooting in minutes. http://p.sf.net/sfu/appdyn_d2d_ap1 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
