[00:00:58] <Russ> if you use a mosfet, just be sure to check the voltage used by the original switch to make sure you have enough gate voltage to turn the fet fully on/off
[00:03:49] <defecta> @russ: ok thanks so in my application where it will be driving a relay I need to match it with the specs of the chosen relay in order to ensure proper operation?
[00:06:49] <defecta> Of the MOSFET that is..
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[02:29:25] <defecta> hey guys, i am trying to connect to my beaglebone via USB to ethernet for the first time. I am using OS X Mountain Lion and I couldn't get the ethernet gadget to connect as easily as its explained in the guides, so I deleted it from the System Preferences > Network. How do I get it back?
[02:30:23] <defecta> (I have previously connected VIA ethernet OK but thats not practical for what I want to do now.)
[02:31:10] <thurbad> have you tried plugging into a different usb port on your mac?
[02:31:24] <defecta> no i haven't
[02:31:28] <defecta> trying now
[02:31:36] <thurbad> I usually get a new device every time I change ports
[02:32:33] <thurbad> still on snow leopard though so that might be a little different for you
[02:33:19] <defecta> yeah it's not showing me any love when using a different USB port either.
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[02:34:08] <defecta> I am meant to have the SD card in while trying all this right?
[02:34:36] <thurbad> yes, if you want the board to actually come up
[02:34:59] <defecta> yeah thats what i thought.
[02:35:04] <defecta> hrrmmm
[02:35:42] <defecta> given that 'no drivers are required' for USB to ethernet on OS X I'm a little stuck.
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[02:40:00] <defecta> do you think Mountain Lion could be complicating things?
[02:47:02] <defecta> i just just got it working again using ethernet. its seems to be working fine otherwise.
[02:47:11] <defecta> just USB to ethernet is shagged.
[02:49:32] <mru> hmm, "high gain omni-directional wireless antenna"
[02:49:38] <mru> that's wrong in so many ways...
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[04:49:33] <defecta> hey guys, I have deleted the RNDIS/ethernet gadget from System Preferences > Network in OS X Mountain Lion without knowing how to add it back, in attempt to troubleshoot why I couldn't get it to work. I have downloaded the latest Angstrom release and successfully extracted it to the uSD card hoping that might help but it didn't. Given that the USB to Ethernet is driverless I am having trouble finding out how to to fix it. I have been
[04:49:33] <defecta> reading the info here, http://www.linux-usb.org/gadget/ but I can't see how its useful to me when I'm using OS X. Any advice on what to do next please?
[04:53:14] <KeatonT> quick question what do I mount for omap?
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[05:22:42] <_av500_> gm
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[05:37:11] <ka6sox-away> morning
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[05:58:34] <alan_o> defecta: I'm not sure about Mountain Lion, but I know in previous versions of OSX (at least 10.5), rndis was not supported at all.
[05:58:54] <alan_o> defecta: and there was no way I found to make it work.
[05:59:28] <alan_o> defecta: one of the things I wanted to try was to build g_ether without rndis and see if OSX had support for that configuration.
[05:59:48] <alan_o> Probably try EEM and ECM both (I think those acronyms are right, it's late and I'm too lazy to look it up)
[06:00:26] <alan_o> anyway I've never gotten there. I had the problem with an Android phone, but you're looking at the same issue. I haven't tried g_ether with bone on mac.
[06:01:42] <alan_o> defecta: if you get it working (or not), I'd be interested to know.
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[06:28:39] <defecta> Thanks alan_o
[06:34:09] <defecta> i find it strange that;'s not mentioned anywhere. And even more strange that I had an RNDIS ethernet gadget in my network interfaces if its not supported.
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[10:50:10] <defecta> I'm still a bit of an electronics noob but I'm learning. Is there a way to set up the voltage GPIO pin on a beaglebone enough to control a 12v relay, without need for an additional 12v supply?
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[10:50:43] <defecta> or am I going about this completely the wrong way?
[10:52:33] <thurbad> probably don't want to drive the relay with gpio if that's what you're planning, maybe look up opamps
[10:56:10] <defecta> ok thanks.
[10:57:30] <thurbad> you will need an external supply of some sort
[11:03:14] <dm8tbr> well there is 3.3V and 5V on board that could be used for the opamp
[11:04:07] <dm8tbr> and depending on the relay it might not need 12V to switch the 12V on the secondary side. check the datasheet.
[11:05:11] <thurbad> depends on the power requirement of the relay those 3.3V I/O don't have much current behind them
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[11:06:05] * dm8tbr would probably drive a FET with the GPIO
[11:08:07] <dm8tbr> random example for a suitable relay you could feed with the 5V that also the beagle needs: http://www.ebay.com/itm/10-x-DC-5V-Coil-1A-125V-AC-2A-30V-DC-8-Pins-DPDT-Power-Relay-HK19F-/320950199687?pt=LH_DefaultDomain_0&hash=item4aba1f6587
[11:08:58] <thurbad> enough to drive a security lock?
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[11:09:20] <dm8tbr> I'd expect something like this should be possible: GPIO -> FET -> Relay
[11:10:48] <defecta> hmm that looks like what i need.
[11:12:01] <defecta> i am trying to use my BB to trigger an 18v DC switch on my intercom that releases the security door in my apartment building.
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[11:15:16] <defecta> i though I knew enough to be able to do this but I am rapidly finding this quite a learning process. Designing the driver for the relay is proving quite a challenge
[11:15:41] <defecta> (for me. given how little I know about electronics.)
[11:19:42] <defecta> can anyone point me to some resources for learning about driving relays from a beaglebone?
[11:21:12] <thurbad> could be as easy as using sysfs if you don't need it to be extremely efficient to send the signal high/low
[11:21:48] <thurbad> you don't necessarily need a proper driver for your application I wouldn't think
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[11:24:15] <defecta> sysfs? my google search didn't really find anything useful..
[11:26:09] <thurbad> quick and dirty ... https://sites.google.com/site/bifferboard/Home/gpio
[11:27:38] <thurbad> you may need to play a little with the demuxing settings either in uboot or the kernel
[11:28:33] <thurbad> ... still easier than developing a proper driver for non time critical operations
[11:29:51] <thurbad> and good for a proof of concept if and determining if it's even feasible before developing such a driver if you do have time critical operations
[11:32:34] <thurbad> you don't need the patch listed at the bottom btw
[11:37:05] <defecta> thanks Ill check that out. I also found this that might be applicable to my application too. what do you think? http://www.youtube.com/watch?v=Pk33lLY384o
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[11:43:55] <thurbad> might help with wiring but doesn't go into any code
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[12:14:11] <Crofton|work> http://live.lmgtfy.com/
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[12:35:56] <florian> Crofton|work: heh
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[13:23:23] <Crofton|work> within 30 seconds "tits" scrolled past
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[17:05:52] <thurbad> does anyone know of a easy way to sync only a specific partition?
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[17:09:27] <thurbad> google returns a lot of results for syncing between partitions, but I'm looking for something like the sync command that will ignore the rootfs
[17:09:56] * ka6sox-away is now known as ka6sox-enyo
[17:24:26] <phh> one way would be to remount the partition as sync
[17:27:37] <thurbad> will that slow the system down by syncing on every write to that partition?
[17:27:58] <thurbad> (on beagleboard specifically)
[17:28:08] <phh> i mean, when you want to sync
[17:28:11] <phh> remount it as sync
[17:28:16] <thurbad> oh
[17:28:17] <phh> and remount it as async immediately after that
[17:29:19] <thurbad> hmm, interesting.. would in sync that partition immediately when remounted?
[17:30:36] <thurbad> s/in/it/
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[17:39:59] <thurbad> I think just running mount -o remount on the partition I want to sync may achieve my goal, thanks
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[19:29:39] <koen> thurbad: iirc there's a sysfs entry to drop caches per partition/disk as well
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[19:39:05] <thurbad> ok I'll look into that as well
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[21:57:46] <pedromario17> Argentina
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[23:32:57] <Jerre> hi
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[23:49:31] <defecta> Hey guys. I have been researching MOSFETs etc for my project at the suggestion of some ppl in here and I found this. http://www.adafruit.com/products/355 it looks like its capable of switching the 18v that I need without the need for a relay. Am I correct?
[23:51:44] <defecta> I still don't know enough to decode all the specs in the data sheet, so any help would be appreciated. =]
[23:51:47] <mranostay> defecta: what current are you sourcing through it?
[23:51:52] <phh> usually the quesiton is more about the current thatn the voltage
[23:51:53] <phh> fail.
[23:52:30] <mranostay> defecta: rather what is the wattage on the datasheet say?
[23:52:34] <phh> erf, it's rated 62A
[23:53:13] <defecta> Hmm, good question. So I need to know the current of the 18v I'm trying switch yeah?
[23:53:26] * ogra_ wonders when the channel topic changed ... no more reference to beagle ? (the search tool)
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[23:54:19] <mranostay> defecta: well you would if you were using a relay too
[23:54:54] <defecta> Ok cool.
[23:55:41] * mranostay senses defecta is going to fry soemthing
[23:56:06] <defecta> When isaid I don't know enough, I meant there are vast expanses of knowledge that I am missing that one would usually have before embarking on a project like this. =]
[23:56:07] <ogra_> well, if he doesnt he will at least a cooling setup thats bigger than a relay :)
[23:56:13] <ogra_> +need
[23:56:26] <defecta> Haha, yeah maybe. =P
[23:57:32] <defecta> Yeah so I should really use the MOSFET to drive the relay?
[23:59:06] <defecta> FYI the MOSFET would only be switching 18v for no more than a second or do. Long enought to release my security gate.