highaltitude.log.20120616

[00:17] <gonzo_mob> i'm in a festival field in wales where it certainly has not heard of summer
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[01:07] <fsphil-laptop> lost at 340m
[01:08] <Lunar_Lander> fsphil-laptop, where did it lift off?
[01:08] <Lunar_Lander> is there a launch station at the shore of the lake?
[01:10] <fsphil-laptop> I think it is yea
[01:11] <fsphil-laptop> it landed further than I expected, I'll probably not go out for it
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[01:18] <fsphil-laptop> anyways, g'nite!
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[07:47] <daveake> morning number10kV
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[07:49] <number10> zzzzzzzzzzzt
[07:49] <number10> I saw that in the logs daveake ^
[07:50] <daveake> :)
[07:50] <daveake> Well those telescopic poles are made of carbon fibre ...
[08:00] <number10> ... I hope
[08:06] <Upu> morning
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[08:10] <daveake> morning
[08:11] <daveake> http://www.upuaut.net/wp-content/themes/twentyten/images/headers/path.jpg needs updating :)
[08:11] <Upu> lol yeah
[08:11] <Upu> never done much with that blog anyway
[08:11] <daveake> So I see :)
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[08:13] <Upu> morning jcoxon
[08:14] <jcoxon> morning
[08:15] <jcoxon> Upu, eurus 2 is based on your board
[08:15] <Upu> Cool I look forward to it
[08:15] <Upu> need more breakouts to control valves and stuff ?
[08:16] <jcoxon> its always helful to have pins
[08:16] <jcoxon> actually to do aprs we need pin 11 which is in hte icsp header
[08:16] <Upu> I did this one https://dl.dropbox.com/u/63720513/Images/PCB%20Pictures/%C2%B5AvaRFM-Rev2_top.png but I'll wait to see how this flight goes before I get it made
[08:17] <Upu> all the analogue pins broken out
[08:17] <Upu> bar A0 which is used for the battery monitor
[08:17] <jcoxon> cool
[08:18] <Upu> can use those for anything
[08:18] <Upu> hope the weather holds
[08:20] <Upu> going to see if I can make a tracking station for £25 for the Wiki
[08:20] <Upu> bit of coax, 1/4 wave and an EZCAP
[08:22] <jcoxon> :-)
[08:23] <jcoxon> people would be very keen for that
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[08:25] <nosebleedkt> hello everybody
[08:25] <Upu> morning nosebleedkt
[08:25] <jcoxon> glad i'm not launching today
[08:25] <Upu> yes I figured a £25 tracking solution would be of interest to most parties
[08:26] <jcoxon> linux boot cd
[08:26] <fsphil-laptop> it's dull but calm here this morning
[08:26] <Upu> wet and dull
[08:26] <jcoxon> about 26km/h winds here
[08:27] <fsphil-laptop> don't think I'll go after that sonde, looks like it landed in a housing estate
[08:27] <fsphil-laptop> or a farm
[08:28] <number10> what time are you planning to launch tomorrow jcoxon ?
[08:28] <jcoxon> 9-10
[08:28] <jcoxon> you free?
[08:28] <number10> yes
[08:29] <jcoxon> a hand would be great
[08:29] <jcoxon> especially as the weather is going to be challenging
[08:29] <number10> what time do you want me there?
[08:29] <jcoxon> 9am if possible
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[08:29] <jcoxon> thats the current plan
[08:29] <number10> OK will do
[08:29] <jcoxon> will keep you updated
[08:30] <number10> OK
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[09:04] <jcoxon> mwhahah
[09:04] <jcoxon> http://ready.arl.noaa.gov/hysplitout/18189_trj001.gif
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[09:07] <jcoxon> hey RocketBoy
[09:08] <RocketBoy> yo chaps
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[09:09] <jcoxon> RocketBoy, http://ready.arl.noaa.gov/hysplitout/18189_trj001.gif
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[09:11] <RocketBoy> ta
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[09:11] <RocketBoy> start venting at 19 or 20K
[09:12] <jcoxon> agreed
[09:12] <jcoxon> its quite a tight window
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[09:14] <jcoxon> RocketBoy, number10 is going to come and help as well
[09:15] <number10> great :) looking forward to seeing the balloon setup
[09:15] <RocketBoy> cool
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[10:03] <Upu> take lots of pics number10 :)
[10:04] <number10> will do
[10:04] <Upu> Do we still have contacts in Iceland ?
[10:04] <Upu> or Canada.... :)
[10:05] <jcoxon> Upu, i think once we've got float established
[10:05] <jcoxon> we can recruit some people
[10:05] <jcoxon> its going to be a slow flight
[10:05] <Upu> yup, whats the battery life on this one ?
[10:06] <jcoxon> well i'm running 2x 4xAA
[10:06] <Upu> thats a few days worth without any power saving
[10:06] <jcoxon> yeah 70+ hrs
[10:07] <cuddykid> will hopefully get HABE booted up today! :D
[10:07] <Upu> great look forward to it, might even be at the radio club with a stearable Yagi if the weather holds up
[10:07] <Upu> cuddykid just power it on and tune into 434.650ish
[10:08] <cuddykid> Upu: will do :) - I saw you were using some sort of power prongs/clips or something? Have a link to a pair?
[10:08] <Upu> yeah 1 sec
[10:08] <cuddykid> thanks
[10:09] <Upu> http://www.ebay.co.uk/itm/10-x-Plastic-Multimeter-Test-Hook-Clip-Grabber-Purple-1-6-for-PCB-SMD-IC-/180895311141?pt=UK_BOI_Electrical_Test_Measurement_Equipment_ET&hash=item2a1e336525
[10:10] <cuddykid> taa
[10:10] <Upu> Cheap but work well
[10:10] <Upu> just means you don't have to solder on when testing
[10:10] <cuddykid> very useful
[10:10] <Upu> you do have to bend the ends al ittle though
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[10:14] <jcoxon> i might turn on the ISS tracker for tomorrow
[10:14] <jcoxon> the payload predicts the position of the ISS
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[10:29] <SamSilver> nosebleedkt: did you get all the information you needed about your valve?
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[10:34] <SamSilver> afk
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[10:39] <Lunar_Lander> hello, got a question for the Twitter users: Do you sometimes get a email from twitter saying "(People you follow) and X others have tweets for you"?
[10:39] <Lunar_Lander> cause I did and when I go to the respective sites of the people they didn't post that
[10:39] <Lunar_Lander> but the email address matches and stuff
[10:42] <Lunar_Lander> ah nevermind seems to have been that weekly digest stuff
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[11:22] Nick change: GeekShad1w -> GeekShadow
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[11:37] <benoxley> Hello
[11:40] <SpeedEvil> hey
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[11:56] <benoxley> afternoon SpeedEvil
[11:59] <cuddykid> oh no, just released my new MBA doesn't have an audio in port.. that's highly annoying!
[11:59] <benoxley> cant you set the audio out as an audio in?
[12:01] <cuddykid> nope, used to be able to do that on MBP but not on this air
[12:01] <cuddykid> guess I'll have to get some sort of usb adapter :S
[12:01] <benoxley> the old mba used to be t-r-r-s like the iphone headphones with mic
[12:01] <benoxley> is that no longer the case?
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[12:02] <cuddykid> doesn't look like it - only headphone port (doesn't double up as audio in)
[12:02] <benoxley> damn :/
[12:02] <cuddykid> yeah, I'll get something off ebay
[12:03] <benoxley> still, mba's are lovely
[12:03] <benoxley> *MBAs
[12:04] <benoxley> cuddykid: tech-specs say: Support for Apple iPhone headset with remote and microphone
[12:04] <benoxley> you should be able to make an adapter
[12:04] <cuddykid> ahh, I'll have a look into it, thanks
[12:04] <cuddykid> yeah - they're awesome machines - got the 11" 128Gb base model and it flies
[12:05] <benoxley> nice :)
[12:05] <benoxley> I don't see the point in the new 13" MBP
[12:05] <benoxley> nothing has really changed...
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[12:08] <cuddykid> nope, nothing can beat SSD either
[12:08] <cuddykid> never getting a hard drive again
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[12:10] <nick_> mba=?
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[12:24] <benoxley> nick_: macbook air
[12:25] <benoxley> cuddykid: waiting for SSDs to hit £100 for 256GB then I'll upgrade
[12:28] <benoxley> jcoxon: any news on eurus?
[12:30] <joph> still falling ;)
[12:30] <joph> 256GB is near 100 pound ;)
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[12:32] <joph> wow, the pound exchange rate between euro and pound is very bad
[12:35] <cuddykid> benoxley: yeah, we're almost there!
[12:35] <cuddykid> around £120 atm I think
[12:35] <joph> i bought a few weeks ago a samsung 830 128GB, it's very fast ;)
[12:36] <joph> 100¬
[12:48] <benoxley> mmm
[12:49] <benoxley> I can't fit my life into 128GB sadly :(
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[13:00] <cuddykid> I fear 128gb won't be enough - so now contemplating either getting external HDD or one of those HP microservers
[13:00] <jonsowman> afternoon #highaltitude
[13:00] <cuddykid> phoned talk talk up to ask for static IP - spent 20mins on the phone to find the answer was no :(
[13:06] Action: SpeedEvil is happy that plusnet just boosted his quota from 80-120G
[13:07] <cuddykid> HABE has been booted :D
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[13:08] <cuddykid> rtty heard loud and clear :) thanks Upu!
[13:08] <Upu> nps
[13:09] <cuddykid> Upu: is it transmitting GPS location with the software you loaded on?
[13:09] <cuddykid> haven't got all the decoding software setup yet
[13:09] <Upu> yeah its working as a FC
[13:09] <cuddykid> brill, thanks
[13:09] <Upu> however
[13:09] <Upu> I would put yours on
[13:09] <cuddykid> will solder on the temp sensors now and then upload code for SD etc
[13:09] <cuddykid> Upu: will do :)
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[13:16] <cuddykid> decoding :D
[13:17] <cuddykid> a 1000 shift though - my fault for putting wrong resistor values down!
[13:17] <Upu> yeah its alot
[13:18] <cuddykid> should be alright though hopefully
[13:19] <cuddykid> HABE1 had a shift of about 850 iirc
[13:20] <Upu> what were the vlues ?
[13:20] <Upu> value s?
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[13:49] <jcoxon> interesting: http://hackaday.com/2012/06/16/two-software-defined-radio-hacks-from-our-resident-sdr-guru/
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[13:55] <eroomde> nice
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[14:10] <jcoxon> afternoon er
[14:10] <jcoxon> eroomde,
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[15:08] <cuddykid> ordered one of those HP micro servers :D
[15:09] <cuddykid> for £135 after cash back - not bad at all
[15:11] <cuddykid> will need to spec it out I think, 2GB ram might not be enough for media stuff, I'll see how it goes
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[15:33] <cuddykid> daveake: what OS do you have running on your proliant?
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[15:54] Action: SpeedEvil wishes variable pitch props were cheaper.
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[15:56] <number10> wind seems to be getting worse here
[15:57] <jcoxon> they are meant to calm a bit overnight
[15:59] <SpeedEvil> It's just doing ridonkulous amounts of rain here
[16:03] <Elwell> SpeedEvil: UK?
[16:03] <SpeedEvil> yeah
[16:03] <SpeedEvil> http://www.yr.no/place/United_Kingdom/Scotland/Glenrothes/hour_by_hour.html
[16:03] <SpeedEvil> almost been raining for 24 solid hours
[16:04] <Elwell> yeah I just heard it started to rain for the windies cricket match
[16:05] <eroomde> windy but no rain here yet
[16:06] <Elwell> not much wind here
[16:06] <Elwell> http://www.itimeteo.com/observations/metar/LSGG.html
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[16:11] <griffonbot> Received email: David Bowkis "[UKHAS] "
[16:11] <jonsowman> number10: ^ ?
[16:11] <fsphil> subjects are so 2011
[16:12] <jonsowman> it's more the content that concerns me
[16:12] <fsphil> or indeed bodys
[16:12] <fsphil> spamity spam
[16:12] <griffonbot> Received email: Oliver de Peyer Astrobiologist "Re: [UKHAS] Re: HELP with Ublox config"
[16:12] <jonsowman> i'm going to put him as moderated for now
[16:13] <fsphil> wise
[16:13] <daveake> I got a direct spam too
[16:13] <jonsowman> yes the To list is full of people
[16:13] <jonsowman> inc. the ukhas list
[16:14] <Upu> he is moderated
[16:14] <jonsowman> he is now
[16:14] <Upu> he was before I'm sure
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[16:14] <jonsowman> otherwise that message wouldn't have got through
[16:14] <Upu> oh number10
[16:14] <jonsowman> yeah
[16:15] <Upu> sorry thought you meant space biologist
[16:15] <jonsowman> ah right
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[16:15] <jonsowman> yeah he's moderated
[16:15] <number10> should calm down later Upu
[16:15] <Upu> what happened there ?
[16:16] <number10> whats that - I didnt send an email
[16:16] <jonsowman> i think you need to change your email password ;)
[16:16] <daveake> I got one direct as well as via the group
[16:16] <daveake> different content
[16:16] <jonsowman> also perhaps follow that one up with a "please don't click that link" or similar
[16:17] <eroomde> chris oliver de payload
[16:17] <eroomde> christ
[16:17] Nick change: Matt_soton -> mattbr
[16:18] <jonsowman> eroomde: mm
[16:18] <eroomde> i'm not entirely sure what that email yes
[16:18] <eroomde> was it a question?
[16:18] <eroomde> was it a brain dump?
[16:18] <jonsowman> the latter
[16:18] <DanielRichman> not entirely convinced it was english
[16:18] <jonsowman> also not related to the thread
[16:18] <number10> 5:11 PM Browser Logged in to Mail Slovakia
[16:19] <eroomde> i think arduinos are bad because i like picaxes because i don't like opaque chunks of code because i like pc104 linux but then there are nice i2c sensors but what is i2c anyway?
[16:19] <Upu> lol
[16:19] <jonsowman> perhaps we should add an eroomde pre-filter to the mailing list
[16:19] <Upu> I think I choose not to release that one
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[16:19] <Upu> someone must have
[16:19] <fsphil> was it really that bad? I've not read it yet
[16:20] <number10> I wonder how they hacked my password
[16:20] <jonsowman> yeah i didn't mean to
[16:20] Action: fsphil waves from raspberry pi running fedora 17
[16:20] <jonsowman> i clicked Accept instead of Reject
[16:20] <jonsowman> oops
[16:20] <jonsowman> never mind
[16:21] <Upu> lol
[16:21] <eroomde> my current boss, who used to be in seds, was talking to me about habs the other day. i was explaining to him that there's this person on the mailing list who seems to get entire hives of bees in his bonnet about things and wants to do sampling for biological life and is sure pc104 is easier than an arduino and so on
[16:21] Action: Upu waves back
[16:21] <eroomde> my boss looked at my a bit alarmed and said 'oh god, it's not oliver de peyer is it?'
[16:21] <Upu> lol
[16:21] <jonsowman> hahah
[16:21] <daveake> lol
[16:21] <fsphil> haha
[16:22] <eroomde> turns out they were in SEDS at about the same time and he's exactly the same now as he was then
[16:22] <jonsowman> reputation precedes him clearly
[16:29] <daveake> I found C a darn sight easier to understand than his logic
[16:30] Nick change: mattbr -> mattbrejza
[16:30] <eroomde> :)
[16:31] <griffonbot> Received email: Nigel Vander Houwen "Re: [UKHAS] HELP with Ublox config"
[16:32] <mattbrejza> is the propeller ment as a toy or an actual microcontroller btw?
[16:32] <jonsowman> the Saleae Logic uses it
[16:32] <mattbrejza> it seems to be a micro for those who cba to multitask
[16:32] <mattbrejza> fairly sure thats not a propeller
[16:32] <mattbrejza> its a cypress thing
[16:33] <eroomde> i just love the fact that in the *same* sentence we have 'personally i am very suspicious of large chunks of code' and 'all talking back to something with lots of serial ports like a simple PC104 board'
[16:33] <fsphil> there are no simple PC104 boards
[16:34] <eroomde> which is presumably running the completely tiny amount of code we call linux
[16:34] <jonsowman> linux isn't a large chunk of code
[16:35] <eroomde> relative to implementing the whole thing on an arduino?
[16:35] <jonsowman> (sarcasm)
[16:35] <number10> I think my password was hacked from linkedin
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[16:35] <jonsowman> number10: that recent security fail?
[16:36] <jonsowman> with linkedin, last.fm and maybe a couple of others
[16:36] <number10> yes
[16:36] <number10> i think i had same password on linked in and the email account
[16:36] <number10> changed the one on linked in, but not on email
[16:36] <daveake> At least you have an excuse for sending out emails containing bollox
[16:37] <number10> lol
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[16:45] <griffonbot> Received email: David Bowkis "[UKHAS] IMPORTANT: email problem - please do not click link on last email"
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[16:45] <jonsowman> thanks number10
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[16:46] Nick change: andrew_apex_ -> andrew_apex
[16:48] <Upu> glad I have 2 factor on my gmail
[16:48] <jonsowman> same
[16:48] <jonsowman> can be a total pain sometimes though
[16:48] <jonsowman> especially when changing ROMs on phone
[16:49] <Upu> yeah
[16:51] <MrScienceMan> at least you want need to pay 2$ to support for recovery
[16:51] <number10> thats the first time I have had anything hacked - must admit that I shouldnt have had the same password on linked in as the email account - pretty pissed off with linked in
[17:01] <G0DJA> I've closed my LinkedIn as well - Just as the company were starting to use it!
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[17:25] <griffonbot> Received email: John Graham-Cumming "Re: [UKHAS] IMPORTANT: email problem - please do not click link on
[17:27] <eroomde> if you liked this email, you might be interested in buying my book, The Geek Atlas
[17:27] <jonsowman> google mail hid that
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[17:31] <Laurenceb_> why do geeks need an atlas?
[17:31] <Laurenceb_> the basement is easy to find
[17:32] Nick change: mattbrejza -> Matt_soton
[17:33] <cuddykid> lol Laurenceb_
[17:38] <number10> I will respond to john directly rather than spam the group
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[17:58] <SpeedEvil> http://uk.farnell.com/jsp/search/productdetail.jsp?sku=2075645#similarProducts - Ah - AI. Where would we be without it.
[17:58] <SpeedEvil> Oh - my mistake.
[17:58] <SpeedEvil> I suppose as accessories those are sorta appropriate
[18:02] <eroomde> yeah soldering that thing would be a bitch
[18:03] <eroomde> when i'm doing really chunky ceramic unductors of that sort of size (10+ Amps) i preheat them with hot air for several minutes just before putting them in the reflow oven
[18:03] <eroomde> their thermal mass is just Too Damn High (tm) otherwise
[18:03] <SpeedEvil> I'm wondering about making a high power boost or buck converter.
[18:03] <SpeedEvil> ~400W.
[18:03] <jcoxon> yay
[18:04] <jcoxon> ISS overhead
[18:04] <SpeedEvil> I've only done ~1W so far.
[18:04] <jcoxon> and Eurus knows it
[18:04] <Laurenceb_> really
[18:04] <jonsowman> nice jcoxon
[18:04] <eroomde> SpeedEvil: sounds cool
[18:04] <eroomde> what's the app?
[18:04] <eroomde> jcoxon: how does eurus know it?
[18:05] <jcoxon> eroomde, it runs the calcs
[18:05] <jcoxon> and it has recent TLE data about the ISS
[18:05] <jcoxon> so can calc the ISS position and therefore its El and Az
[18:05] <eroomde> wow
[18:05] <jcoxon> see spacenear.us
[18:05] <eroomde> what's the computer on eurus?
[18:05] <Laurenceb_> thats awesome
[18:05] <jcoxon> atmega328
[18:06] <jcoxon> i didn't do it from scratch
[18:06] <jcoxon> i'm not that good
[18:06] <Laurenceb_> you load in two line elements?
[18:06] <SpeedEvil> eroomde: I have a shitty grid-tie inverter from ebay. It has 26-60V input. My solar panels Vpp is 28V. The inverter is current limited, and hence outputs half power. If I attach both panels in series it exceeds the max voltage.
[18:06] <jcoxon> thre is a plan13 library
[18:06] <Laurenceb_> plan13?
[18:06] <Laurenceb_> whats that?
[18:07] <SpeedEvil> eroomde: So either boost from ~36 to 60, or buck from ~70 to 55
[18:07] <eroomde> ah yes the plan13
[18:07] <Laurenceb_> like plan9 from outer space?
[18:07] <eroomde> i remeber reasding about that now
[18:07] <jcoxon> http://www.amsat.org/amsat/articles/g3ruh/111.html
[18:07] <Laurenceb_> ah amsat
[18:07] <jcoxon> i'm using https://sites.google.com/site/qrptracker/
[18:07] <eroomde> SpeedEvil: awesome
[18:07] <jcoxon> which is an arduino port
[18:07] <SpeedEvil> eroomde: Also a testbed for random high power solar peak-powertacking things I'm thinking of.
[18:07] <jcoxon> eurus is also generating PWM to do packet APRS
[18:07] <eroomde> that sounds really cool
[18:07] <jcoxon> all its missing is a radio
[18:07] <eroomde> do it and blog about it
[18:08] <eroomde> jcoxon: does eurus need to know the iss position to function or is this just for shits and giggles?
[18:08] <eroomde> not that i in any way disapproveof the latter
[18:09] <jcoxon> eroomde, well we were planning to bounce off the packet repeater
[18:09] <jcoxon> when the 2m version was working
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[18:09] <jcoxon> but they unplugged it last week :-(
[18:09] <jcoxon> now its 70cm
[18:09] <jcoxon> which is much harder as you have to account for doppler
[18:09] <jcoxon> so now its just for fun and to test hte code
[18:09] <SpeedEvil> SDR to pick up ISS motion from a couple of antennas would be cool.
[18:10] <SpeedEvil> Hmm.
[18:10] Action: SpeedEvil ponders.
[18:10] <SpeedEvil> Can you actually use two antennas, and a simple mixer?
[18:10] <SpeedEvil> into the SDR
[18:10] <eroomde> jcoxon: hab comms relayed via ISS would certainly be worthy of a pint at habcon
[18:10] <SpeedEvil> To get a very fine-toothed radiation pattern.
[18:11] <jcoxon> eroomde, oh yes
[18:11] <jcoxon> so the plan13 can account for doppler as well
[18:11] <jcoxon> we just need to rig a radio to do that as well
[18:12] <jcoxon> the chinese baofeng can't be remote controlled
[18:12] <Laurenceb_> SpeedEvil: measure the phase at each ant?
[18:12] <eroomde> jcoxon: ah cool
[18:12] <eroomde> well the temp compensation thing i tried worked pretty well
[18:12] <jcoxon> its such a shame that 2m packet is off
[18:12] <jcoxon> as that might have actually worked :-p
[18:13] <SpeedEvil> Laurenceb: If you have two 70cm antennas spaced by (say) 70m, and mix them, you get nulls every 1/100th radish. Also doppler variation as it passes
[18:13] <SpeedEvil> radianish
[18:14] <jonsowman> every 1/100th radish would be more fun
[18:14] <SpeedEvil> Laurenceb: To avoid having to have a 2-channel SDR
[18:14] <eroomde> the link jcoxon posted earlier was doing the df technique by switching at high speed between a bunch of antennas with the trl-sdr
[18:14] Action: Laurenceb_ confused
[18:14] <eroomde> to get a beat freq from the phase
[18:14] <SpeedEvil> yeah - I saw that
[18:14] <Laurenceb_> so you actually multiply the two singals?
[18:15] <SpeedEvil> Laurenceb: I meant simply put them into the same reciever.
[18:15] <Laurenceb_> rather than separate IQ demod for each
[18:15] <SpeedEvil> Not 4 quadrant mix - simply sum
[18:15] <Laurenceb_> oh, so one receiver i see
[18:15] <Laurenceb_> oh
[18:15] <Laurenceb_> that gives you a more highly directional ant
[18:16] <SpeedEvil> If you use several antennas, you can probably pull the path out, with some gnarly maths.
[18:16] <SpeedEvil> But it's probably more sane to use multiple channel recievers
[18:16] <Laurenceb_> yeah
[18:16] <Laurenceb_> then you can calculate driectly from phase
[18:16] <SpeedEvil> At least for RF - for light it may change
[18:17] <Laurenceb_> lol
[18:18] <SpeedEvil> I was playing with pinholes.
[18:18] <SpeedEvil> Poke several pinholes in a bit of foil, and look through it
[18:18] <SpeedEvil> the diffraction pattern perfectly shows you why synthetic apature telescopes have limits
[18:22] <eroomde> my housemate: "I didnt find The Exorcist that scary"
[18:22] <eroomde> Her irish friend: "That's because you're not catholic"
[18:25] <eroomde> well i lol'd anyway
[18:26] <Laurenceb_> anyone know anything about adhesives?
[18:26] <eroomde> yes
[18:26] Action: SpeedEvil glues Laurenceb's ears together.
[18:26] <Laurenceb_> "Eta* at 100 rad/sec during dynamic temperature sweep of silicone hot melt pressure sensitive adhesives prepared with various plasticizer levels.
[18:26] <Laurenceb_> "
[18:26] <eroomde> do not put them in your eyes
[18:26] <Laurenceb_> ^any idea wtf that means
[18:27] <eroomde> what's after the *
[18:27] <Laurenceb_> nothing
[18:27] <Laurenceb_> ill grab the datasheet
[18:27] <SpeedEvil> I would guess it to be a viscosity versus temperature graph.
[18:27] <Laurenceb_> http://www.google.com/url?sa=t&rct=j&q=dow%20corning%20bio-psa%207-4560&source=web&cd=2&ved=0CHAQFjAB&url=http%3A%2F%2Fwww.dowcorning.com%2Fapplications%2FDocs%2FDocOptions.asp%3FstrSearch%3D03327876%26Country%3DUSA%26doc%3DPDS%26Ind%3D011%26App%3Dprod_finder%26pass%3DY%26lang%3DE&ei=JNDcT7fKKdCg8gOKkMyUCw&usg=AFQjCNHeE6X7f0e85DadSgLQCZAJedZ5ug&cad=rja
[18:28] <Laurenceb_> eww google
[18:28] <Laurenceb_> oh radians
[18:28] <Laurenceb_> some kind of stir test
[18:28] <Laurenceb_> thought it was radiation resistance
[18:30] <Laurenceb_> that makes sense now
[18:30] <SpeedEvil> yeah
[18:30] <SpeedEvil> Viscosity is often measured in that sort of rig
[18:30] <SpeedEvil> so it'd make sense for adhesives
[18:31] <Laurenceb_> so it melts around 180C, which matches for the specs in the rest of the datasheet
[18:31] <Laurenceb_> looks like it will work, i just have the small chellenge of buying some
[18:31] <SpeedEvil> implanty stuff?
[18:31] <Laurenceb_> *challenge
[18:31] <SpeedEvil> Samples!
[18:32] <Laurenceb_> no stick on stuff
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[18:32] <SpeedEvil> I guess not stick onto skin
[18:32] <Laurenceb_> yeah but i need to find the right person to email
[18:32] <SpeedEvil> :)
[18:32] <eroomde> i'm not sure you're alloed to say 'Samples!' in the context of medical device discussion SpeedEvil
[18:32] <Laurenceb_> yes, you pour onto the device hot then stick on ptfe film
[18:32] <Laurenceb_> hehe
[18:32] <Laurenceb_> feel off ptfe before sticking to skin
[18:32] <Laurenceb_> *peel
[18:32] <Laurenceb_> i cant spell
[18:33] <Laurenceb_> think medical grade flashband
[18:34] <SpeedEvil> ah
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[18:34] <Laurenceb_> you can retackify flashband with a propane torch so its probably the same stuff
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[18:35] <Laurenceb_> dissolved in solvent it might work for superpressure balloons too
[18:35] <Laurenceb_> as it sticks to pretty much everything apart from PTFE
[18:36] <Laurenceb_> dunno if heptane dissolves polythene
[18:37] Action: Laurenceb_ contemplates flashband dissolved in white spirit
[18:38] <eroomde> sister act is an amazing film
[18:40] <SpeedEvil> Interesting idea.
[18:40] <SpeedEvil> Laurenceb: I've played with silicone sealant dissolved in white spirit - can be interesting
[18:41] <Laurenceb_> yeah, its not quite the same thing
[18:42] <Laurenceb_> thats cured silicone rubber thats tackified.. somehow
[18:42] <Laurenceb_> the sketch in the datasheet is hard to make sense of
[18:43] <Laurenceb_> usually people use acrylic adhesives for sticking to skin, but acrylic adhesive wont stick the silicone rubber
[18:43] <Laurenceb_> i need to stick to silicone rubber
[18:46] <SpeedEvil> Ah.
[18:46] <SpeedEvil> You have a realdoll.
[18:46] <Laurenceb_> ...
[18:47] <Laurenceb_> no thats just what i do with the spare silicone
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[18:47] Nick change: fsphil-laptop -> fsphil
[18:56] <Laurenceb_> http://img.photobucket.com/albums/v387/mediocre1/itsreal.gif
[18:56] <jonsowman> :\
[18:56] <SpeedEvil> :)
[18:57] <Laurenceb_> http://s1.b3ta.com/host/creative/69107/1339206930/jedwoods.gif
[18:57] <Laurenceb_> lolling
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[18:58] <SpeedEvil> http://b3ta.com/links/810462 :)
[18:59] <eroomde> '[issed up'
[18:59] <eroomde> 'pissed up'*
[19:00] <eroomde> i like it when people's english is not quite there
[19:00] <eroomde> there was a chinese guy at uni who once came up to me and declared loudly, with a very flushed face, that 'I am really pissed off!'
[19:00] <eroomde> 'why are you pissed off ivan?'
[19:01] <eroomde> 'because i have had three glasses of port!!!'
[19:01] <SpeedEvil> :)
[19:01] <eroomde> took me a second
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[19:04] <eroomde> ivan tried hard though, bless him
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[19:04] <eroomde> in the first term he announced he'd bought the entire box-set of One Foot In The Grave to improve his english
[19:04] <eroomde> it was a trying few weeks after that
[19:04] <eroomde> 'how are you ivan?'
[19:04] <eroomde> 'ah, i'm... just the ticket!'
[19:05] <eroomde> 'no, ivan.... nevermind'
[19:05] <SpeedEvil> :)
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[19:17] Nick change: Matt_soton -> mattbrejza
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[19:28] Nick change: mattbrejza -> Matt_soton
[19:28] Nick change: Matt_soton -> mattbrejza
[19:28] <jcoxon> coming up to another ISS pass
[19:29] <Laurenceb_> does it try to uplink?
[19:29] <jcoxon> it did
[19:29] <jcoxon> however they've changed the radio on the iss very recently
[19:29] <jcoxon> so it doesn't work any longer
[19:31] <Laurenceb_> wow
[19:31] <Laurenceb_> how is it uplinking?
[19:31] <eroomde> did you say that Plan 13 calcs doppler?
[19:32] Nick change: mattbrejza -> Matt_soton
[19:32] Nick change: Matt_soton -> mattbrejza
[19:32] <Laurenceb_> hmm - with si4432 you could retune
[19:33] <eroomde> anything wih a vco too ofcourse
[19:33] <jcoxon> eroomde, yeah
[19:33] <jcoxon> it can
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[19:42] <eroomde> jcoxon: cool
[19:42] <eroomde> sounds like good software
[19:42] <jcoxon> i just squeezed it in
[19:42] <jcoxon> someone else wrote it
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[20:19] <jcoxon> hey RocketBoy
[20:20] <RocketBoy> yo
[20:20] <RocketBoy> any updates for tomorrow?
[20:20] <jcoxon> http://ready.arl.noaa.gov/hysplitout/11329_trj001.gif
[20:21] <fsphil> got pretty variable again
[20:21] <RocketBoy> aim for 22500?
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[20:21] <jcoxon> yup
[20:21] <jcoxon> the big question is groundwinds too high?
[20:22] <RocketBoy> ok - i'll set the trail dump for 1 min at 18500
[20:22] <RocketBoy> thats a good point - what are they?
[20:22] <jcoxon> accuweather says 18km/h
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[20:24] <RocketBoy> humm - I was thinking about that - I really don't want to put any strain on the neck valve & payload assembly
[20:25] <RocketBoy> shall we take view tomorrow at the site - i guess its a long way to come if we abort
[20:25] <jcoxon> thats the only thing
[20:26] <jcoxon> next weekend is forecast to have similar winds
[20:28] <RocketBoy> I think the launch wind direction is difficult too - if it was the other way it would be easier
[20:31] <jcoxon> hmmm
[20:31] <eroomde> is the next value instumented?
[20:31] <eroomde> neck*
[20:31] <RocketBoy> nope
[20:32] <jcoxon> RocketBoy, whats annoying is that it'll turn back pretty much immediately
[20:33] <eroomde> i'd love a sensor that'd do accuracy of about 10Pa from 0-101kPa
[20:33] <RocketBoy> me too
[20:33] <jcoxon> RocketBoy, would your concern be the balloon acting like a sail while we walk it out?
[20:33] <RocketBoy> that can handle the temps
[20:34] <RocketBoy> I'd go for a line pickup launch
[20:34] <RocketBoy> holding the neck then let go
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[20:34] <jcoxon> i was thinking
[20:34] <RocketBoy> (neck/valve)
[20:35] <jcoxon> we could bring it out with a sheet over it
[20:35] <eroomde> i think the cheaper sensors would be the things to go for to make this
[20:35] <jcoxon> could restrict it from tugging and twisting
[20:35] <eroomde> i.e. the ones that are just a bridge
[20:35] <eroomde> and do all the cleverness in conditioning
[20:35] <eroomde> the honeywell 24PC series forex, they're sort of £20 per sensor
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[20:36] <eroomde> they're more temp stable if you drive them with a constant current rather than constant voltage
[20:36] <eroomde> but would still need calibrating
[20:37] <eroomde> blah whatever. have got a few somewhere and i'll try and build a drive circuit
[20:37] <RocketBoy> it wouln't be too difficult to retrofit the valve with a small tube
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[20:37] <RocketBoy> but very little room left in the payload box
[20:38] <eroomde> i'll have a go at building an absolute and differential sensor in a box
[20:38] <eroomde> as accurately as i can
[20:38] <eroomde> and see if we can show it onto a payload
[20:38] <eroomde> shoe*
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[20:39] <eroomde> would you be interested if i could make a wee unit with a uart or spi interface that would spit out abs and differential pressure?
[20:39] <eroomde> interested in flying it, specifically
[20:40] <RocketBoy> OK - I suggest we hold off the launch - and I'll look at a more robust neck attachment for next week
[20:40] <jcoxon> RocketBoy, okay
[20:40] <RocketBoy> I just don't think its up to a windy launch ATM
[20:41] <jcoxon> okay
[20:41] <jcoxon> it would be a very difficult launch
[20:41] <RocketBoy> happy to add eds sensor to the pay;oad (SPI would be best)
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[20:42] <RocketBoy> think i'll detach the valve from the electronics box with a couple of ft of wire
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[20:42] <Lunar_Lander> hello
[20:43] <RocketBoy> and cycle the servo occasionanally to keep it warm/free
[20:43] <Lunar_Lander> hi RocketBoy
[20:43] <eroomde> ok, i'll design a pcb and try and get it fabbed this week
[20:44] <jcoxon> RocketBoy, is it worth attempting to launch Eurus
[20:44] <eroomde> if you know anyone with a pressure calibrator, that'd be super useful. i think i can make something very very fine resolution (for example to see if the balloon 'bobs' as it floats with say a few tens of Pa amplitude) but absolute accuracy is quite tricky
[20:44] <eroomde> we borrowed a fluke pressure calibrator for a previous prject but that's not available anymore
[20:45] <eroomde> anyway details, will fab something up
[20:46] <Lunar_Lander> hello eroomde jcoxon
[20:46] <jcoxon> hi Lunar_Lander
[20:46] <eroomde> hi Lunar_Lander
[20:46] <Lunar_Lander> how is the Eurus 2 status?
[20:46] <jcoxon> Lunar_Lander, we are discussing that currently
[20:47] <Lunar_Lander> yea
[20:54] <Lunar_Lander> WOW there is a dangerous link I just read in the mailing list?
[20:57] <number10> just dont click links in emails that you are not sure of. Lunar_Lander
[20:58] <Lunar_Lander> yea
[20:58] <Lunar_Lander> I saw what he meant and of course didn't click
[20:59] <eroomde> i clicked
[20:59] <Lunar_Lander> OHHHH
[20:59] <eroomde> wazs really useful thanks
[20:59] <number10> we dont know if its dangerous as none of us have clicked it :) apart from ed
[20:59] <jonsowman> i incognito-clicked
[20:59] <eroomde> i've been meaning for my weight to drop
[20:59] <eroomde> how did you know?
[21:00] <number10> lol
[21:00] <Lunar_Lander> xD
[21:01] <number10> I think "<eroomde> i clicked" gave the game away
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[21:03] <Laurenceb_> muha
[21:03] <Laurenceb_> broken the halfway point in my epic CE paperwork battle
[21:03] <Lunar_Lander> but the crap is that I have just finished a half-days work of reinstalling ubuntu!
[21:04] <Lunar_Lander> would have been REALLY CRAPPY to have to do that again
[21:04] <eroomde> my ubuntuupgrade experience was not stellar
[21:04] <eroomde> tried the in situ upgrade, it borked, went for a fresh install
[21:04] <Lunar_Lander> did you have a update failure too?
[21:04] <Lunar_Lander> yea
[21:04] <Lunar_Lander> flash failed to update last week or so
[21:04] <Lunar_Lander> and then Firefox crashed on Facebook all the time
[21:04] <eroomde> still, teaches you to always have at least /home backed uop
[21:04] <Lunar_Lander> yea
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[21:05] <eroomde> i hadn't but i had everything in dropbox
[21:05] <eroomde> so on the new machine i just had to install dropbox and scp .vim/, .ssh/ and .vimrc from my laptop
[21:06] <eroomde> then i was back up to speed
[21:06] <Laurenceb_> http://www.wackyarchives.com/wp-content/uploads/2008/07/funny_windows_error_25.jpg
[21:07] <eroomde> i was a little dissappointed to see the shiny tektronix scope we borrwed for work was just an xp machine
[21:07] <eroomde> inside a scope case
[21:08] <eroomde> agilent not tektronix
[21:08] <eroomde> don;t want to slight tektronix
[21:09] <Lunar_Lander> yea
[21:11] <fsphil> euu
[21:11] <jcoxon> we are debating whether to launch Eurus without vent, aiming for float at 33km or so
[21:11] <jcoxon> would people be up for tracking?
[21:12] <eroomde> i was going to go to work tomorrow ayway to desing thing pressure sensor
[21:12] <eroomde> so sure why not
[21:12] <eroomde> what tine launch?
[21:12] <eroomde> time*
[21:12] <jcoxon> well it'll be early - 930 ish
[21:13] <jcoxon> but we'll be aiming for a simlar flight
[21:13] <jcoxon> to eurus 1
[21:14] <eroomde> aaargh
[21:14] <eroomde> it's a binary functio
[21:14] <eroomde> whoops premature
[21:15] <Laurenceb_> designing a pressure sensor... from scratch?
[21:15] <eroomde> not the sensor itself
[21:15] <Laurenceb_> oh
[21:15] <Laurenceb_> boring :P
[21:15] <eroomde> just an accurate circuit to condition a simple honey bridge
[21:16] <Laurenceb_> have any good suggestions for pitot sensors?
[21:16] <Laurenceb_> ah honeywell
[21:16] <eroomde> and an ovenised box to put it all in
[21:16] <Laurenceb_> interesting
[21:16] Action: Laurenceb_ wants to try some microbridge sensors
[21:16] <eroomde> what are they?
[21:18] <Laurenceb_> mems hot film
[21:18] <Laurenceb_> with conditioning and amplifier on die
[21:19] <eroomde> spendy?
[21:20] <Laurenceb_> i dont know
[21:20] <Laurenceb_> sequoia sell them
[21:20] <Laurenceb_> but no prices online
[21:20] <Laurenceb_> they go down to 25Pa full scale, 25mPa error over range
[21:21] <Laurenceb_> which is insane
[21:21] <eroomde> not bad though would be nice to have 1 sensor do the whole flight
[21:22] <Laurenceb_> oh they are differential
[21:22] <Laurenceb_> i was thinking for pitot
[21:22] <Laurenceb_> you could get the 1.25KPa version
[21:22] <Laurenceb_> what sort of 1/f noise do you see from honeywell sensors?
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[21:24] <Laurenceb_> i see about 3 or 4 pascals in the first few Hz
[21:24] <eroomde> not sure. was planning on filtering them to like 5hz anyway
[21:24] <Laurenceb_> yeah
[21:25] <Laurenceb_> im going to stick one on a decent DSO next week
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[21:26] <eroomde> good idea
[21:26] <eroomde> i think i want to persude work to get a fluke 718
[21:28] <eroomde> http://www.ebay.co.uk/itm/HP-8592L-Spectrum-Analyzer-9-kHz-to-22-GHz-/110850736654?pt=UK_BOI_Electrical_Test_Measurement_Equipment_ET&hash=item19cf38020e#ht_569wt_1071
[21:28] <eroomde> i could sell my car
[21:28] <eroomde> i cycle to work most days anyway
[21:29] <jonsowman> lol
[21:29] <Laurenceb_> yeah but 9khz min
[21:29] <Laurenceb_> DSO can go to DC
[21:29] <Laurenceb_> well almost
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[21:29] <Laurenceb_> my tektronics has max 100s storage and 100M points
[21:30] <Laurenceb_> so 10 millihz
[21:31] <eroomde> dso cant be compared to a specan
[21:31] <eroomde> not even closely
[21:32] <Laurenceb_> i know
[21:32] <eroomde> the resolution is orders of mag better
[21:32] <eroomde> anyhoo system analysers for dc-100khz
[21:33] <Laurenceb_> dso is ok for pressure sensor flickr noise imo
[21:34] <griffonbot> Received email: James Coxon "[UKHAS] Re: Eurus 2 Launch Sunday 1000 BST"
[21:34] <jcoxon> number10, we are going to postpone
[21:34] <jcoxon> too windy
[21:34] <number10> ok
[21:34] <Laurenceb_> :(
[21:34] <Lunar_Lander> jcoxon, YOUR CODE ROCKS
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[21:55] <Lunar_Lander> hi phirsch
[21:56] <Lunar_Lander> new to us?
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[22:07] <Lunar_Lander> hi stilldavid
[22:07] <Lunar_Lander> jcoxon, can you link me to your github please?
[22:07] <fsphil> google!
[22:08] <Lunar_Lander> thanks
[22:09] <fsphil> ah, got my exclamation mark on the wrong side :)
[22:09] <jonsowman> at least zeusbot is awake today
[22:10] <Lunar_Lander> xD
[22:10] <Lunar_Lander> ah JOEY-M is not an arduino?
[22:10] <jonsowman> no
[22:10] <jonsowman> bare metal AVR
[22:11] <number10> what day dor you think you may launch jonsowman ?
[22:11] <number10> -r
[22:11] <jonsowman> number10: weather is looking awful at the moment, weds/thurs looking best
[22:11] <jonsowman> http://hourly.cusf.co.uk
[22:11] <jcoxon> jonsowman, not good is it
[22:11] <jonsowman> jcoxon: nope, rubbish
[22:11] <number10> hopefully thurs as I am out wednesday ;)
[22:11] <jonsowman> :(
[22:12] <jonsowman> number10: okay :)
[22:12] <jonsowman> will let you know
[22:12] <jonsowman> this thing has 4 gopros on it
[22:12] <jonsowman> so we're not taking any risks
[22:12] <number10> wow
[22:13] <Lunar_Lander> jonsowman, ah ok
[22:15] <jonsowman> it would be fairly easy to port to arduino i think
[22:16] <jonsowman> it might Just Work actually.. maybe
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[22:16] <Lunar_Lander> yeah
[22:16] <Lunar_Lander> I think my slovenian friend and I once tested that arduino can understand code in .h and .cpp files
[22:17] <fsphil> it should, it is cpp after all
[22:17] <fsphil> it'll handle C code too
[22:17] <jonsowman> yeah, it should compile I think
[22:17] <jonsowman> there's probably something i've missed
[22:17] <BrainDamage> it's not the arduino's job
[22:17] <BrainDamage> it's the compiler's
[22:18] <BrainDamage> and arduino IDE uses g++, a c++ compiler
[22:18] <BrainDamage> avr c++ tough it's limited
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[22:18] <BrainDamage> it's only a subset of c++
[22:18] <eroomde> i've certainly never had a problem putting conventional avr-gcc code on an arduino
[22:19] <jonsowman> you can have arduino use gcc instead of g++
[22:19] <jonsowman> (the avr versions of such)
[22:19] <jonsowman> just editing a Makefile iirc
[22:20] <eroomde> avrdude -p $(MMCU) -P /dev/ttyUSB0 -b 57600 -c arduino -U flash:w:$(PROJECT).hex
[22:20] <eroomde> is the prelevent line from the makefile i use to put avr-gcc stuff on arduins
[22:21] <eroomde> relevent
[22:21] <jonsowman> :)
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[22:47] <Laurenceb_> http://www.st.com/internet/mcu/product/251211.jsp?WT.ac=spear_spear1340_apr11
[22:47] <Laurenceb_> interesting - ST socs
[22:47] <Lunar_Lander> socks?
[22:48] <Laurenceb_> system on chip
[22:48] <Laurenceb_> like OMAP etc
[22:49] <Lunar_Lander> ah sorry
[22:49] <Lunar_Lander> yea
[22:54] <SpeedEvil> Not seen that line - are those new?
[22:54] <SpeedEvil> ah
[22:54] <SpeedEvil> that'll be what the 'preview' at the top means.
[22:54] <Laurenceb_> http://www.st.com/internet/evalboard/product/253211.jsp
[22:54] <Laurenceb_> yes
[22:55] Action: SpeedEvil wants OMAP5.
[22:55] <SpeedEvil> Or indeed the above. Same price as Pi please.
[22:58] <SpeedEvil> http://www.digikey.com/product-search/en/integrated-circuits-ics/embedded-microprocessors/2556260?k=spear
[23:01] <Laurenceb_> arm9 version only
[23:03] <SpeedEvil> I was wondering about what was actually available from them
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[23:11] <Laurenceb_> so no launch tomorrow?
[23:12] <SpeedEvil> I vaguely recall concerns about groundlevel winds.
[23:12] <SpeedEvil> I wasn't watching carefully
[23:12] <Laurenceb_> yeah i was wondering if they are launching later or not at all
[23:15] <fsphil> not at all
[23:15] <Laurenceb_> :(
[23:15] <fsphil> yea
[23:20] <SpeedEvil> fsphil: wind?
[23:25] <Laurenceb_> omap5 looks nice
[23:25] <Laurenceb_> dual a15 and m4
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[23:35] <SpeedEvil> Indeed.
[23:35] <SpeedEvil> Gonna be a while before we get one on a board I guess though
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[00:00] --- Sun Jun 17 2012