#emc | Logs for 2005-06-28

[00:02:49] <robin_sz> the xilinx one is free and *very* impressive
[00:03:06] <SWPadnos> Altera also has a free version, but not with the NIOS processor core
[00:03:14] <robin_sz> * robin_sz nods
[00:03:28] <SWPadnos> I have the Xilinx package as well (with MicroBlaze CPU) - just haven't gotten around to using it yet
[00:03:45] <robin_sz> its took me anly a couple of evenings from cold
[00:04:22] <robin_sz> fpgas are stunning technology
[00:05:04] <SWPadnos> yep
[00:05:39] <SWPadnos> I had some wxperience with PLDs, PALS, CPLDs and the like, but the new chips are amazingly fast and *big*
[00:05:49] <robin_sz> didn't I see a 80c51 on an fpga that actually runs twice as quick as a proper 80C51
[00:05:57] <SWPadnos> probably
[00:06:07] <SWPadnos> there are also PIC and AVR cores available
[00:06:13] <robin_sz> yeah
[00:06:28] <robin_sz> and PCI bus interfaces
[00:06:39] <SWPadnos> http://www.opencores.org is a great place
[00:06:45] <robin_sz> * robin_sz nods
[00:06:58] <SWPadnos> USB, ethernet, PCI, serial, couters, timers, video controller (!), etc
[00:07:35] <SWPadnos> stepper motor controller ... :)
[00:07:41] <robin_sz> Steve hardy managed to write a stepper pulses to VGA adapter ...
[00:07:49] <robin_sz> with digital readouts
[00:08:06] <SWPadnos> heh - via USB
[00:08:17] <robin_sz> fpga board, stepper pulses in one side, VGA monitor the other
[00:08:26] <SWPadnos> interesting
[00:08:33] <robin_sz> and it plotted the path
[00:08:41] <SWPadnos> cool
[00:08:56] <SWPadnos> hook that up to encoders instead, and you have an awesome DRO
[00:08:59] <robin_sz> I asked him if he used the open cores video driver ..
[00:09:20] <robin_sz> and he said .. "nah, it was trivial, easier to just do it" ...
[00:09:52] <SWPadnos> NTSC (and PAL) video is pretty easy to generate these days - there was a project that used a PIC (only) to make a PONG game
[00:10:00] <robin_sz> yeah
[00:10:08] <SWPadnos> and PICs suck
[00:10:09] <robin_sz> as long as you dont want colour
[00:10:13] <SWPadnos> true
[00:10:29] <SWPadnos> though the RGB interface of a VGA screen gives color pretty easily
[00:10:34] <robin_sz> yep
[00:10:35] <SWPadnos> (at least 8 colors0
[00:10:39] <robin_sz> heh
[00:15:14] <Jacky^> night
[00:15:22] <SWPadnos> see ya Jacky^
[00:15:31] <Jacky^> bye all
[00:15:34] <robin_sz> night
[00:15:42] <robin_sz> better go too.
[00:15:46] <SWPadnos> see ya
[00:15:52] <SWPadnos> SWPadnos is now known as SWP_Away
[01:09:25] <Jymmm> les!
[01:13:14] <A-L-P-H-A> lez!
[01:13:18] <A-L-P-H-A> ;)
[01:34:53] <Jymmm> Installing BDI 4.20 now, any way I can change the pinout for use with Xylotex before I continue?
[01:35:19] <cradek> read the wiki pages and recompile
[01:35:33] <cradek> or, make a hardware adapter.
[01:36:19] <Jymmm> I hate wiki's, just a glorified electronic post-it note
[01:37:27] <cradek> you're welcome for answering your question
[01:38:14] <Jymmm> cradek: That doesn't answer my question...
[01:38:28] <cradek> what doesn't answer what question?
[01:38:30] <Jymmm> Can I change it BEFORE/DURING the install
[01:38:52] <cradek> no, you have to install, then read the wiki pages, then use those instructions to recompile emc.
[01:38:57] <cradek> OR, make a hardware adapter.
[01:40:18] <Jymmm> So if I #define, then that's the ONLY thing I can use (driver wise)?
[01:40:32] <Jymmm> or does it ADD it?
[01:40:55] <cradek> it changes the pinout of the step/dir; the other stepping types are unaffected
[01:41:00] <cradek> iirc
[01:41:52] <Jymmm> so if U se a geck breakout board later on, would I need to recompile is what I'm asking?
[01:41:58] <cradek> also beware those instructions are for emc1.
[01:42:04] <cradek> yes.
[01:42:26] <cradek> alternately, you could use emc2, which lets you configure this using the hal files.
[01:42:27] <Jymmm> emc1 == bd1 4.20
[01:42:47] <cradek> bdi 4.20 comes with a bastard child of emc1 and emc2
[01:42:49] <Jymmm> isn't emc2 still beta
[01:43:02] <cradek> sure it is
[01:43:12] <cradek> but it has been able to drive steppers for a while now.
[01:43:39] <Jymmm> but hal isn't part of bdi 4.20 is it?
[01:43:47] <cradek> no
[01:43:58] <cradek> it's part of emc2, which you can build and run on bdi.
[01:45:05] <Jymmm> well bdi doesn't even like this machine, just chocked!
[01:47:41] <cradek> did you check your md5sum on the download?
[01:48:39] <Jymmm> yep
[01:50:47] <Jymmm> doesn't like the video it seems.
[01:51:38] <Jymmm> when it gets to starting x server it chokes, unmounts everything and says safe to reboot.
[01:55:10] <cradek> that sounds not very helpful
[01:57:35] <Jymmm> XIO: Fatal IO error 104
[01:57:53] <Jymmm> is the error I get.
[01:58:05] <cradek> the real error is probably earlier
[01:58:41] <Jymmm> X server started sucessfully
[01:58:44] <Jymmm> XIO: Fatal IO error 104
[01:59:04] <Jymmm> there is another error after that one, but not beofre.
[02:01:17] <Jymmm> XIO: Fatal IO error 104 (Connection reset by peer) on X server "1:0 after 0 requests (o known processed) with 0 events remaining.
[02:01:55] <Jymmm> That is the whole error message, then another one after that in respect to mini-WM that's simular.
[02:02:02] <cradek> what kind of video card?
[02:02:18] <Jymmm> Intel CA810e mobo w/ onboard video.
[02:02:36] <cradek> try a real video card
[02:03:36] <Jymmm> it works under sid (fwiw)
[02:03:44] <cradek> what's sid?
[02:03:47] <Jymmm> debian
[02:03:55] <Jymmm> debian stable
[02:03:57] <cradek> ah
[02:04:15] <cradek> might be totally different versions of X, I don't know.
[02:04:39] <Jymmm> I suspect sid is WAY older than bdi 420 though =)
[02:04:48] <cradek> paul always rants about how onboard video is bad for realtime
[02:05:15] <Jymmm> bbiab looking for another card. MAybe so, but it shouldn't choke the install.
[02:05:20] <cradek> I always disable onboard video and put in a real video card, just on principle. It's always served me well.
[02:05:31] <Jymmm> Jymmm is now known as JymmmAFK
[02:25:04] <JymmmAFK> JymmmAFK is now known as Jymmm
[02:33:28] <Jymmm> There's a glassy eyed drunk penguin on my screen that looks like he want to hail a cab and go home
[02:34:04] <A-L-P-H-A> feed it anti-acid stuff.
[02:34:19] <Jymmm> and it's eyes are dialated
[02:38:36] <Jymmm> basic or custom install?
[02:39:17] <cradek> basic
[02:39:36] <cradek> the custom doesn't let you make any consequential choices anyway
[02:42:41] <Jymmm> /boot doesn't need to be 100MB does it ?
[02:43:00] <cradek> kernels and initrd go there, so if you have several kernels, yes
[02:43:08] <A-L-P-H-A> whack
[02:43:13] <cradek> but, not really.
[02:43:40] <Jymmm> I want to reserve empty space above 1024 for M$
[02:50:47] <CIA-4> 03jmkasunich * 10emc2/src/hal/components/threads.c: fixed a typo that caused BDI-2.xx, -TNG, and -Live compiles to fail (strangely, BDI-4.20 compiled it without warnings..)
[03:40:19] <Jymmm> aw fuck... 'unhandeled exception' AND it won't let me save the crash dump to floppy!
[04:20:01] <Jymmm> Alright, this is getting old now... how many times do I have to reboot to get it to install 100% ?!
[04:24:32] <Phydbleep> Jymmm: I've hed it never work on a P-II/LX440 board..
[04:25:32] <Jymmm> this is a celeron cpu on a intel ca810e mobo
[04:26:05] <Phydbleep> Omnboard video/sound/lan?
[04:26:42] <Jymmm> now ext video (ATI AIW), but sound and lan are onboard plus a 3com nic
[04:27:19] <Jymmm> dual nics
[04:27:51] <Phydbleep> Kill the onboard sound in the bios..
[04:28:11] <Jymmm> it's SB128 chipset
[04:28:55] <Phydbleep> Kill it and the davicom nic in the bios.
[04:29:18] <Jymmm> it's an intel nic onboard
[04:30:00] <Jymmm> ok, wtf ever, I'll give it a shot.
[04:32:18] <Phydbleep> Jymmm: Make sure the 'agp apeture' is 2x the video ram..
[04:33:01] <Jymmm> pci video card
[04:34:55] <Phydbleep> agp slot in the machine?
[04:35:01] <Jymmm> nope
[04:35:20] <Jymmm> http://support.intel.com/support/motherboards/desktop/ca810e/sb/cs-012798.htm
[04:35:50] <Jymmm> sid doesn't have any problems with this mobo.
[04:38:07] <Jymmm> Phydbleep I'm just in a fowl mood over the whole thing ~ nothing personal if it comes across that way.
[04:46:36] <Phydbleep> Jymmm: NP, Have you got the latest bios for it? :)
[04:57:12] <Jymmm> yep
[05:11:18] <Phydbleep> Jymmm: Only other thing I can think of is disable APM/ACPI, LPT, serial, sound, net and then use the onboard video set to use 8meg of ram with a 16 meg apeture.
[05:11:59] <Phydbleep> aperture
[05:12:21] <A-L-P-H-A> gah.
[05:12:22] <Jymmm> power mgnt is disabled ~ I just seems that the installer just isn't liking this mobo too well.
[05:12:26] <A-L-P-H-A> my client is being an idiot.
[05:12:41] <A-L-P-H-A> he wants it one way... and I think it's stupid.
[05:12:57] <A-L-P-H-A> gah... I hate it when I don't get my way... which I can reason out to him.
[05:13:05] <A-L-P-H-A> he just wants it, cause it's the initials to his company.
[05:14:50] <Jymmm> so waht youre saying is your a real bitch when you dont get your way?
[05:17:08] <Jymmm> Ok, in case BDI fails install for a 3rd time, is there somethign else I can dl and install?
[05:17:15] <A-L-P-H-A> yes.
[05:17:19] <A-L-P-H-A> to the first q.
[05:17:28] <Jymmm> lol
[05:17:34] <A-L-P-H-A> it's like, I see it, I see it won't work. I just want to waste my time.
[05:18:20] <A-L-P-H-A> cause 1, I know after I've made it, and I show them my design, they'll like it. But only after I show them their design being sucky.
[05:18:34] <A-L-P-H-A> if I do my design first, they'll be like, WTF we wanted our design.
[05:18:50] <A-L-P-H-A> and my design will be quashed regardless of how superior it'll be.
[05:18:55] <Jymmm> so, charge them double.... once for theirs, then again for yours.
[05:19:00] <A-L-P-H-A> exactly!
[05:19:04] <A-L-P-H-A> that's what I'm gonna be doing.
[05:19:31] <A-L-P-H-A> but it's not even the money, though it will compensate me for my time.
[05:19:34] <A-L-P-H-A> I just hate doing work twice.
[05:24:49] <Jymmm> I hear ya. Just get a better quailty of clientel
[05:26:52] <A-L-P-H-A> i really shouldn't be complaining. They are paying clients.
[05:48:29] <Jymmm> Well, it seems to be installing now.... 40 minutes remaining
[06:02:59] <LawrenceG> this may seem like a stupid question, but is anyone running servos with emc2?
[06:03:17] <fenn> we were last week
[06:03:17] <Phydbleep> Jymmm: Mine wouls get that far and then bomb in the post-install. :\
[06:03:57] <LawrenceG> good... just working on a new hal driver for the mesa 5i20 card
[06:04:02] <fenn> cool
[06:05:03] <LawrenceG> one of the simple configs is 4 encoders in, 4 pwm DACs out and 48 i/o pins
[06:05:45] <fenn> why not use a board with DAC's built in, if i may ask?
[06:05:58] <LawrenceG> along with a few extras like index, dir and enables
[06:06:47] <LawrenceG> well, I have this board and the pwm outputs and a dir bit work with the driver I have....
[06:07:22] <fenn> so.. the amp takes a digital input?
[06:07:53] <Jymmm> Phydbleep : Geeze, thanks! lol
[06:08:03] <LawrenceG> the amp board has a lp filter and uses the avg dc value
[06:08:24] <Jymmm> mother fucker.... 25 minutes remaining and it craps out again...
[06:08:35] <LawrenceG> (I think.... it has not been hooked up yet)
[06:08:45] <fenn> jymmm.. this machine doesn't sound reliable enough to run a router with
[06:09:18] <Jymmm> fenn It's fine with SID/2k
[06:09:52] <LawrenceG> jymmm - boot an ubuntu disk and run the memtest86 overnight to see if it finds a bad memory
[06:10:52] <Jymmm> LawrenceG I ran memtest86 before installing for about 10 minutes - no problem.
[06:12:25] <Jymmm> "enter to retry" seems to have got it to continue installing (this time).
[06:12:27] <LawrenceG> ok... maybe not long enough... you installs are blowing upafter 1/2 hour or so... could be heat related
[06:13:07] <Jymmm> cover is off, room is cold, temp is good, and this machien would run 24/7 no problem.
[06:13:57] <LawrenceG> strange... enter to retry sounds like it could be a bad drive
[06:14:14] <LawrenceG> either cd or HD
[06:14:51] <LawrenceG> bedtime here... goodnight all...
[06:14:53] <Jymmm> I just burned this cdr (that's where it had issues)
[06:14:57] <Jymmm> G'Night LawrenceG
[06:15:18] <fenn> jymmm is it a laptop?
[06:15:28] <Jymmm> Intel CA810e mobo
[06:18:16] <fenn> well, good luck.. if it were me, i'd feel around and see if any parts were hot
[06:21:46] <Jymmm> thanks
[06:28:17] <Jymmm> A-L-P-H-A whats the name/url of that utility you use thats like 'top'?
[07:03:16] <fenn> alex, wanna do a favor for me?
[07:03:28] <alex_joni> depends *g*
[07:03:30] <alex_joni> but shoot
[07:03:43] <fenn> i need a logger on #emc-mazak, think you could set yours up to log both channels?
[07:03:51] <alex_joni> I think so
[07:03:53] <alex_joni> lemme check
[07:07:53] <Jymmm> mazak????
[07:08:15] <alex_joni> Jymmm: the famous retrofit ;)
[07:08:42] <Jymmm> no clue, sounds Jewish to me.... moz ill toff
[07:08:47] <Jymmm> ?!
[07:09:03] <alex_joni> mazak is a BIG machine manufacturer
[07:09:06] <alex_joni> google it up
[07:09:15] <Jymmm> ah, ok
[07:18:33] <fenn> Jymmm: http://fenn.freeshell.org/retrofest/
[07:18:50] <fenn> still need to make a pretty html page for that
[07:26:47] <alex_joni> which one's fenn in those pics?
[07:27:05] <fenn> i dont think i'm in any of those, since i took all those pictures
[07:27:15] <alex_joni> heh
[07:27:44] <fenn> roland will be compiling all of the pictures from the 150+ people who attended the fest
[07:27:52] <fenn> i'm sure i'm in some of them ;)
[07:28:12] <alex_joni> when's the fest over...
[07:28:58] <fenn> it ended on sunday at about 4 pm
[07:29:12] <fenn> roland locked all my stuff in the garage cause he thought i had left!
[07:29:29] <fenn> i was having dinner before i hit the road
[07:29:57] <fenn> http://fenn.freeshell.org/camera/DCP_0346.JPG <- me
[07:36:06] <Phydbleep> fenn: Man that's a scarey picture. <G> :)
[07:36:36] <fenn> mwahahaha
[07:36:55] <Phydbleep> You should warn people before you upload such obscene things to the net. :)
[07:37:10] <fenn> or at least put a towel over it, right?
[07:37:37] <Phydbleep> Right. :)
[08:06:48] <Jymmmm> Hmmm, seems dns is furbared
[08:45:57] <fenn> frogs have invaded my room, it seems
[08:59:47] <Phydbleep> * Phydbleep wonders which gods fenn pissed off or what he's been smoking...
[09:28:24] <alex_joni> alex_joni is now known as alex_joni_away
[11:23:59] <Jacky^> morning
[11:34:34] <Jacky^> anyone tried Opencascade Cad ?
[12:20:22] <fenn> Jacky^: looks cool, I looked at it a month ago but haven't tried it yet.
[12:20:42] <fenn> I think opencascade is more of a library set than a ready to go CAD system
[12:21:38] <fenn> Open CASCADE Technology can be best applied in development of numerical simulation software including CAD/CAM/CAE...
[12:37:27] <fenn> howdy
[12:37:34] <ValarQ> hiya
[12:46:25] <fenn> just finished my photo-essay of the Mazak retrofit: http://fenn.freeshell.org/retrofest/default.html
[12:52:26] <Jacky^> re
[13:41:19] <SWP_Away> SWP_Away is now known as SWPadnos
[14:58:10] <alex_joni_away> alex_joni_away is now known as alex_joni
[14:58:18] <SWPadnos> Hi Alex
[15:01:16] <alex_joni> hey Stephen
[15:11:46] <A-L-P-H-A> tag. you're it.
[15:11:59] <alex_joni> A-L-P-H-A: ?
[15:14:10] <A-L-P-H-A> tag?
[15:14:18] <SWPadnos> = day in German
[15:14:24] <A-L-P-H-A> Tag's a childrens game...
[15:14:35] <alex_joni> right
[15:14:40] <alex_joni> A-L-P-H-A = child ?
[15:14:44] <A-L-P-H-A> sure.
[15:14:46] <SWPadnos> also, the thing you're not allowed to remove from a pillow
[15:14:55] <alex_joni> SWPadnos: why not?
[15:15:11] <SWPadnos> I don't know, but they all say "do not remove, under penalty of law"
[15:15:16] <SWPadnos> or some other crap like that
[15:15:29] <alex_joni> heh
[15:15:31] <A-L-P-H-A> that's matresses.
[15:15:32] <alex_joni> maybe over there
[15:15:33] <A-L-P-H-A> not pillows.
[15:15:48] <SWPadnos> well - this is the USA, so we have that on Mattresses, pillows, and sheets
[15:16:01] <SWPadnos> "Land Of The Free" and all
[15:29:21] <A-L-P-H-A> crap. hungry.
[15:29:32] <A-L-P-H-A> instant noodles, veggies, fried egg? :/
[15:49:21] <anonimasu> hello
[15:49:31] <alex_joni> hey anonimasu
[15:49:45] <anonimasu> I am finally home from work :)
[15:49:54] <anonimasu> went to customer in this morning 05:00
[15:50:06] <anonimasu> I changed one value, in the PLC... that's user settable..
[15:50:57] <anonimasu> then I nudged another one, like 25ms..
[15:51:07] <anonimasu> and well, I went for a 300km drive.
[15:51:11] <anonimasu> back home
[15:55:44] <anonimasu> fenn: looks really nice
[16:32:21] <CIA-4> 03alex_joni * 10emc2/src/emc/motion/ (control.c mot_priv.h): fixed a small bug in the kinematics code, seems that all joints were tested for homing, even if the joints weren't active
[16:32:47] <alex_joni> it is ALIVE ;)
[16:32:52] <alex_joni> my toy is moving properly ;)
[16:33:28] <alex_joni> laters guys
[17:15:42] <approx> newbie asking: is it possible to run EMC on desktop machine?
[17:15:53] <approx> without booting every time..
[17:15:58] <SWPadnos> yes
[17:16:25] <approx> I tried to install rtai kernel on my machine and system hard locked when starting X
[17:16:45] <SWPadnos> shat distribution?
[17:16:47] <SWPadnos> what
[17:16:51] <approx> fedora 2
[17:17:37] <approx> I also use JACK audio connection kit which needs some realtime priorities.. might cause problems?
[17:18:39] <SWPadnos> could be
[17:19:33] <approx> I also need additional realtime-lsm module to run JACK
[17:20:03] <approx> is it possible to try emc without any realtime support?
[17:25:45] <SWPadnos> phone - hold on
[18:35:55] <Jacky^> ugh !
[18:36:07] <Jacky^> http://www.news.com.au/story/0,10117,15739502-13762,00.html
[18:37:33] <Jacky^> 0_0
[18:38:08] <Jacky^> think how the animalist will be happy..
[18:40:09] <ValarQ> Jacky^: i saw that one :)
[18:40:29] <ValarQ> Jacky^: and yes, the animalists must love it...
[18:43:02] <Jacky^> mmmh
[18:43:51] <robin_sz> meep?
[18:43:59] <Jacky^> hi robin_sz
[18:44:09] <robin_sz> gday
[18:44:13] <Jacky^> ValarQ: they are crazy ..
[18:44:26] <ValarQ> Jacky^: no, just a bit insane ;)
[18:44:34] <Jacky^> :-)
[18:44:48] <robin_sz> insane? ideal! elect them to the board!
[18:46:01] <Jacky^> Tests show they are perfectly normal, with no brain damage...
[18:46:09] <Jacky^> ghghg Frankenstein
[18:46:26] <Jacky^> robin_sz: read here http://www.news.com.au/story/0,10117,15739502-13762,00.html
[18:46:45] <Jacky^> see you later..
[18:46:53] <Jacky^> Jacky^ is now known as Jacky^afk
[18:47:40] <ValarQ> * ValarQ installs vigor
[18:47:54] <ValarQ> where is the fetch-me-a-brain command?
[18:48:22] <robin_sz> mmm brains.
[18:49:26] <robin_sz> taking dogs, draining their blood and freezing them is an activity I approve of
[18:49:42] <robin_sz> bringing them back to life? nah.
[18:50:29] <SWPadnos> but if you allow that, then some bonehead would come along and do it to *cats* too
[18:50:46] <robin_sz> euww. thats different
[18:51:12] <robin_sz> that would be inhumane
[18:51:26] <robin_sz> ridding the planet of dogs is simply garbage disposal
[18:51:45] <SWPadnos> ValarQ, apt-get install intelligent-brain
[18:51:53] <ValarQ> or snns
[19:06:25] <robin_sz> thats wha we need ... an emc driven replacemetn brain.
[19:06:37] <SWPadnos> emc1 or emc2?
[19:07:04] <robin_sz> well, the emc1 version works fine, but only installs in one version of human
[19:07:23] <robin_sz> and they can walk, but not run, and its all a bit jerky
[19:07:26] <SWPadnos> realtime humans
[19:07:51] <robin_sz> the emc2 version installs more easily
[19:08:11] <robin_sz> but you need to leave them in college for twice the usual time to cinfigure all the options
[19:08:14] <SWPadnos> and is much more configurable
[19:08:50] <robin_sz> the Mach2 equipped humans dont have either of those problems ...
[19:09:04] <robin_sz> but tend to fall over dead early in the lifecycle
[19:11:13] <robin_sz> got some good news today ...
[19:11:35] <robin_sz> looks like the parts I despatched for assessment have passed ...
[19:11:52] <robin_sz> should have an order soon <fingers crossed>
[19:28:40] <alex_joni> grettings
[19:28:56] <SWPadnos> hi
[19:29:02] <alex_joni> hey stephen
[19:30:15] <alex_joni> what's up?
[19:30:24] <SWPadnos> just the temperature
[19:30:31] <alex_joni> same here
[19:30:33] <alex_joni> :(
[19:30:42] <SWPadnos> I'm thinking of continuing to clean the garage around the mill
[19:30:49] <alex_joni> heh
[19:30:53] <SWPadnos> (lots of aluminum chips around :) )
[19:31:14] <SWPadnos> I think its cooler in there as well
[19:31:41] <SWPadnos> (it's 29.1C in my office right now :( )
[19:32:34] <SWPadnos> so - your machine is working - congratulations
[19:33:06] <alex_joni> yeah.. well ..
[19:33:12] <alex_joni> it's just a toy
[19:33:18] <SWPadnos> ok - moving, not necessarily working :)
[19:34:01] <alex_joni> it's not supposed to work
[19:34:09] <alex_joni> movement is all I was earning for
[19:34:26] <SWPadnos> well - congratulations on getting it moving correctly
[19:35:14] <alex_joni> ;)
[19:36:27] <alex_joni> ty
[19:37:04] <alex_joni> will post some movies soon probably ;)
[19:37:30] <SWPadnos> cool
[19:44:07] <Jacky^afk> Jacky^afk is now known as Jacky^
[19:48:47] <SWPadnos> SWPadnos is now known as SWP_Away
[19:54:03] <alex_joni> quiet in here
[20:45:37] <Phydbleep> * Phydbleep is busily collecting Lexan and preparing for the excratory matter to impact the rotating air circulator..
[21:29:15] <alex_joni_> night guys
[21:29:22] <ValarQ> g'dnite
[21:29:24] <ValarQ> ...
[21:32:06] <ValarQ> welcome back
[21:32:07] <ValarQ> er
[22:59:47] <les> hello all
[23:02:45] <les> hmmm no one home I guess
[23:03:06] <SWP_Away> sort of here, but not here at the same time :)
[23:03:15] <les> heh
[23:03:44] <les> I was just doing energy harvesting experiments today
[23:03:59] <SWP_Away> sounds like you should live on Tatooine :)
[23:04:12] <les> got about 20 mW from an air whistle
[23:04:31] <SWP_Away> what kind of whistle?
[23:04:38] <SWP_Away> (kazoo or truck horn)
[23:05:29] <les> air nozzle blowing on about a 1x2 mm quarter wave acoustic stub
[23:05:38] <les> little organ pipe
[23:05:45] <les> 50 kHz
[23:05:46] <SWP_Away> ah
[23:06:17] <les> very intense sound field
[23:06:24] <les> flow is supersonic
[23:06:36] <les> mach diamonds and all
[23:07:44] <les> I am a ways away from generating the electrical power needed...but i'll tell you what
[23:07:56] <SWP_Away> loud, is it? :)
[23:08:06] <les> I can easily make an air powered ultrasonic cleaner!
[23:08:16] <les> about 100 acoustic watts
[23:08:26] <SWP_Away> ouch - that'll split eardrums
[23:09:00] <les> It is enough to cause cavitation and cellular disruption for sure
[23:09:19] <les> but not dangerous to ears
[23:09:33] <les> fingers tingle when near it
[23:10:09] <les> like if you dip your hand in an ultrasonic cleaner
[23:10:37] <SWP_Away> I don't do that too often ;)
[23:10:52] <les> but turning into electricity...what an impedance mismatch
[23:11:07] <les> air= 400 Rayls
[23:11:32] <les> piezo PZT= 3x10^7 Rayls
[23:12:00] <les> nedd q of 10,000 or so for stub match
[23:12:03] <les> nasty
[23:12:09] <SWP_Away> what a unit the rayl is
[23:12:29] <SWP_Away> 10 pascal-seconds / meter
[23:12:32] <les> just volume velocity divided by pressure
[23:13:28] <A-L-P-H-A> wow. SI units!
[23:13:31] <les> oops
[23:13:33] <les> inverse
[23:13:36] <les> haha
[23:13:59] <les> just kiddin
[23:14:12] <A-L-P-H-A> can't make up your mind can you?? :)
[23:14:13] <SWP_Away> SI except for the fact that a bar isn't SI (and a pascal is 0.1 bar)
[23:14:15] <les> anyway it is hard to tune stubs for that
[23:14:27] <SWP_Away> 10000 is a pretty high Q
[23:14:27] <les> may try piezopolymer instead
[23:14:35] <A-L-P-H-A> where's Bar? I see SWP_Away using pascal
[23:14:52] <les> low q. low impedance
[23:15:08] <SWP_Away> I use C and assembler - haven't used Pascal for decades
[23:15:15] <les> haha
[23:15:32] <SWP_Away> foo-bar
[23:16:02] <les> aw, this stuff is a living I guess
[23:16:37] <les> have to generate 6 watts 100 kV with no (grossly) moving parts?
[23:17:04] <les> I would rather use an air turbine.
[23:17:37] <les> compressed air-> electrical power
[23:18:08] <les> client has asked for whistles and piezo.
[23:19:24] <les> nasty spl though...I think I am getting about 160 db SPL plus at one meter
[23:19:55] <SWP_Away> that's a lot
[23:20:04] <les> diamond shock waves in supersonic flow does that
[23:21:07] <les> close in it is a big overpressure....compression waves are many atmospheres
[23:23:09] <les> so couple to piezo stack with quarter wave impedance matching stubs...get it?
[23:23:36] <SWP_Away> uh - yeah - I got it. Well - gotta run now :)
[23:23:42] <les> haha
[23:23:45] <les> ok
[23:23:49] <les> later
[23:23:59] <SWP_Away> (too hot to think about this kind of thing right now)
[23:24:08] <les> ac.
[23:24:15] <SWP_Away> not in my office yet :(
[23:24:21] <SWP_Away> 86F in here
[23:24:25] <les> yuck
[23:24:39] <SWP_Away> yep - gonna go out to the garage where it's cooler
[23:24:49] <les> 72 here
[23:24:50] <SWP_Away> (like only 82 or so)