highaltitude.log.20110101

[00:00] <Lunar_Lander> happy new year to all in the UK!
[00:00] <SpeedEvil> thanks.
[00:00] <SpeedEvil> same here.
[00:00] <Lunar_Lander> thanks
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[00:19] <Lunar_Lander> SpeedEvil want to see a funny thing?
[00:20] <SpeedEvil> Yes.
[00:20] <SpeedEvil> Is it a carrot shaped like a thingy?
[00:20] <Lunar_Lander> xD
[00:20] <Lunar_Lander> no actually it is something by Vaisala
[00:20] <Lunar_Lander> http://www.vaisala.com/Vaisala%20Documents/User%20Guides%20and%20Quick%20Ref%20Guides/RS92_Quick_Guide_in_English.pdf
[00:21] <SpeedEvil> :)
[00:21] <SpeedEvil> It could do with more carrots though.
[00:21] <Lunar_Lander> yeah
[00:21] <Lunar_Lander> I don't know the intention of that manual
[00:22] <Lunar_Lander> is it: Everyone should be able to launch a balloonsonde?
[00:22] <Lunar_Lander> or "Who doesn't get this is a moron"
[00:22] <Lunar_Lander> xD
[00:24] <SpeedEvil> It's not bad to have a checklist to avoid stupid moments
[00:25] <Lunar_Lander> yeah, true
[00:28] <SpeedEvil> Especially if you want to use unskilled people to launch balloons.
[00:29] <SpeedEvil> I mean - it's fun if you're doing it as a hobby - but you're not going to want to launch one every 3 hours in all weathers
[00:34] <Jasperw> i've just come down from the london hackspace roof, the air over london is covered with fire lanterns, i've never realised they where so popular.
[00:34] <Jasperw> there was a family launching one from the street beneath us.
[00:39] <Randomskk> massive fire hazard >.>
[00:39] <Lunar_Lander> yeah
[00:40] <Lunar_Lander> and people confuse them with UFOs all the time
[00:42] <Lunar_Lander> btw
[00:42] <Lunar_Lander> do you know that Vaisala began when Mr. Vaisala found a russian balloonsonde and reverse engineered it?
[00:51] <Elwell> father in law sent vid of the festival at chiang mai -- loadsa lanterns
[00:53] <Lunar_Lander> cool
[00:53] <Elwell> http://www.youtube.com/watch?v=IDkHE0z8NO0&feature=fvw
[00:54] <Elwell> 's old but you get the idea
[00:54] <Lunar_Lander> yay
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[11:19] <Laurenceb_> these fire lanters are lame
[11:19] <Laurenceb_> you need to make them from scratch with wheely bin liners and meths burners
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[12:37] <jcoxon> morning all
[12:37] <jcoxon> okay more like afternoon
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[12:41] <fsphil> hehe, aftermorning
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[13:08] <m1x10> Hi all !
[13:08] <m1x10> Happy new year!
[13:12] <fsphil> hny m1x10 :)
[13:12] <jcoxon> hey fsphil, made the gpsbee order
[13:13] <fsphil> sweet - it's 2mm headers isn't it?
[13:13] <jcoxon> yeah
[13:13] <fsphil> how many pins?
[13:13] <jcoxon> xbee format
[13:16] <fsphil> ah that looks easy enough
[13:16] <jcoxon> i got the sparkfun breakout - plugged in its a really nice package
[13:18] <fsphil> I've got some 2mm JST headers which would've been handy, VCC, RX and TX are all next to eachother. GND is the only oddity, way on the other side
[13:18] <jcoxon> on my rfbee i also soldered to the top
[13:18] <jcoxon> same format
[13:18] <jcoxon> saved on the headers
[13:19] <m1x10> Hi
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[13:21] <Laurenceb_> happy new year all
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[13:22] <fsphil> 2011 - the year of many successful hab launches :)
[13:22] <m1x10> haha
[13:23] <Randomskk> wow, that dso seeedstudio do is getting smarter with each revision
[13:23] <Randomskk> it looks really quit eneat now
[13:23] <Randomskk> quite*
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[13:41] <fsphil> grrrr.... http://www.bbc.co.uk/news/uk-northern-ireland-12102570
[13:43] <Randomskk> D: that's awful
[13:59] <fsphil> ooh early predictions for next week are still showing a big long flight: http://habhub.org/predict/#!/uuid=20f0a065bf82ce8a178fa5ee17aa18766ff751a0
[14:00] <Randomskk> ooh, nice
[14:00] <Randomskk> good luck recovering though :P
[14:00] <fsphil> yep, could be interesting :)
[14:01] <fsphil> 400m up, that's higher than our local mountain/big hill
[14:01] <SpeedEvil> anoterh 50 miles north, and I'd pick it up.
[14:04] <SpeedEvil> Well - not really - there is a nice road only a few hundred yards away
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[14:17] <Laurenceb_> hi all
[14:17] <Laurenceb_> Randomskk: http://code.google.com/p/imumargalgorithm30042010sohm/downloads/detail?name=An%20efficient%20orientation%20filter%20for%20inertial%20and%20inertialmagnetic%20sensor%20arrays.pdf&can=2&q=
[14:17] <Laurenceb_> ^thats insane - i calculated 400hz possible on atmega
[14:18] <Randomskk> :o
[14:18] <Laurenceb_> ~100 or so flops per cycle
[14:19] <Laurenceb_> also http://www.chrobotics.com/index.php?main_page=product_info&products_id=2
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[14:36] <SpeedEvil> neat!
[14:37] <SpeedEvil> can you use fixed point?
[14:38] <SpeedEvil> http://qkwv.com/weight.gif - gnuplot question.
[14:38] <SpeedEvil> (though woo as I'm losing weight again).
[14:38] <SpeedEvil> I want to plot some lines only partway across the graph.
[14:39] <SpeedEvil> So plot [0:5] f(x),g(x),h(x) works fine.
[14:39] <SpeedEvil> plot [0:5] f(x),[1:2] g(x), ...doesn't
[14:39] <SpeedEvil> Any thoughts?
[14:43] <DanielRichman> [0:5] f(x),g(x/5+1) ?
[14:45] <SpeedEvil> umm - no.
[14:45] <SpeedEvil> See the above graph.
[14:46] <SpeedEvil> There are three sloping lines, representing best fits over time to the data.
[14:46] <SpeedEvil> I want to cut off those sloping lines at the end of the periods they are fitted to.
[14:48] <DanielRichman> oh yeah >.> oops
[14:49] <Laurenceb_> there is a way to do that...
[14:49] <Laurenceb_> i forget
[14:50] Action: Laurenceb_ isnt that good with gnuplot
[14:50] <SpeedEvil> Idly wondering if anyone had a clue.
[14:50] <SpeedEvil> Not really an urgent problem, I'm just trying to avoid doing anything constructive. :)
[14:50] <SpeedEvil> Hows work going?
[14:51] <Laurenceb_> not so bad - video backlog cleared :P
[14:51] <Laurenceb_> would help if people didnt keep walking in front of the monitors :(
[14:52] <SpeedEvil> Backlog - the data is still being collected?
[14:52] <Laurenceb_> yes
[14:53] <Laurenceb_> if someone is in front for too long you lose a screens worth of data - as its scrolling
[14:53] <Laurenceb_> so some of the data logs had to be split into several parts :(
[14:54] <Laurenceb_> also found a firmware bug in the masimo radical 7
[14:54] <SpeedEvil> The hardware in question?
[14:55] <Laurenceb_> yes - very rarely a potion of the lcd isnt updated correctly after signal loss/aquisition
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[14:59] <SpeedEvil> What's the monitor monitoring?
[14:59] <Laurenceb_> dunno
[15:00] <Laurenceb_> they appear to still be alive at the end of the vid, so thats ok i guess :P
[15:02] <Laurenceb_> that CHR6 thingy is a bit poor - EKF using euler angles
[15:03] <Laurenceb_> i dont see why youd want to try that, maths is more complex, theres more flops and it explodes at certain angles
[15:04] <Laurenceb_> but its opensource and the tx/rx pins are exposed, so you could use the serial bootloader and reflash it with something better
[15:05] <Laurenceb_> - already got the code for talking to the sensors and the matrix libraries etc
[15:06] <DanielRichman> SpeedEvil: pretty ugly solution, uh, but:
[15:07] <DanielRichman> gnuplot> set parametric
[15:07] <DanielRichman> gnuplot> plot [t=0:1] (5*t),t, (t+1),((t**2)/10+0.2)
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[15:08] <SpeedEvil> DanielRichman: hmm
[15:08] <SpeedEvil> DanielRichman: yeah - in principle I see what you did there.
[15:08] <DanielRichman> it's still ugly :P
[15:08] <SpeedEvil> DanielRichman: In practice, it's too much hastle to rewrite.
[15:08] <DanielRichman> yup
[15:08] <SpeedEvil> Thanks though - a useful tool.
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[15:09] <SpeedEvil> I'd have to recode all the fit functions, and work out the date handling explicitly
[15:09] <SpeedEvil> And possibly externally convert the dates, as I doubt it'd cope with timefmt
[15:13] <Laurenceb_> http://cgi.ebay.co.uk/NEW-NISSAN-MICRA-1-0-1-4-16v-AIR-FLOW-SENSOR-MAF-PROMO-/230543867070?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item35ad7c3cbe
[15:14] <Laurenceb_> ^interesting - seems to be some sort of heated thermistor
[15:21] <Laurenceb_> http://en.wikipedia.org/wiki/Mass_flow_sensor
[15:25] <SpeedEvil> yeah - some use that - some use a pressure sensor
[15:28] <Laurenceb_> the inductive ones look very interesting
[15:28] <Laurenceb_> i dont quite understand how that works
[15:29] <Laurenceb_> guess if you use a permittivity of the air, and an electric field you can create a displacement current through the air
[15:37] Action: m1x10 runs a nose-bleed day :(
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[16:18] <SpeedEvil> http://www.bbc.co.uk/news/uk-england-somerset-12102865
[16:18] <SpeedEvil> :/
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[19:59] <n0sebl33d> cmon ppl make some noise! This is highaltitude!
[20:01] <MrCraig> Sorry - was watching the ben heck show
[20:06] Action: fsphil is cooking :p
[20:18] <n0sebl33d> oh fsphil!
[20:28] <fsphil> mmm pizza
[20:30] <Laurenceb_> http://www.st.com/internet/analog/product/250938.jsp
[20:30] <Laurenceb_> it does exist
[20:31] <Laurenceb_> the fabled st pressure sensor
[20:35] <Laurenceb_> LPS001WP is about equivalent performance to the bmp085 it seems
[20:38] <MrCraig> bbl
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[20:41] <n0sebl33d> Laurenceb_: why not use the bmp085?
[20:41] <Laurenceb_> st might be really cheap - if they ever ship it
[20:41] <Laurenceb_> st have a habit of announching products that never turn up
[20:46] <n0sebl33d> mhh
[20:47] <Laurenceb_> the L3G4200D is listed on mouser and digikey now, but no stock
[20:48] <Laurenceb_> i rang them up about the lsm303dlh after that never showed up, they said they had production problems and sent me 3 samples
[20:49] <Laurenceb_> the datasheet for l3g4200d gives noise in degrees per second :S
[20:51] <SpeedEvil> That's annoying - still not?
[20:52] <Laurenceb_> well i have 3 samples now
[20:53] <Laurenceb_> and i know where to get itg-3200/imu-3000
[20:54] <Laurenceb_> the l3g datasheet seems to be saying 0.03dps noise over 40hz... that would be better than th ebest from invensense
[20:54] <Laurenceb_> somehow i think not
[20:55] <SpeedEvil> Some makers really don't seem to understand noise very well.
[20:58] Action: Laurenceb_ ponders what to try and get on free day
[20:59] <Laurenceb_> maybe sensor stick
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[21:19] <russss> http://spaceflightnow.com/news/n1012/31galaxy15/
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[00:00] --- Sun Jan 2 2011