highaltitude.log.20091026

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[03:12] <jiffe99> how are the attachments to the top of the chute typically done?
[03:40] <natrium42> if the chute has central line, then it's easy
[03:40] <natrium42> otherwise you can sew on a loop at the center
[03:41] <natrium42> then attach a rope and a rotating joint and then rope again up to the balloon
[03:42] Action: natrium42 also uses a carabiner hook to quickly attach the payload to balloon
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[07:00] <jcoxon> morning
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[07:52] <gordonjcp> jcoxon: morning
[07:55] <jcoxon> morning gordonjcp
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[09:26] <MikeMc68> morning all
[09:27] Nick change: MikeMc68 -> MikeMc_
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[11:23] <Laurenceb> http://www.xkcd.com/654/ <- lol
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[11:46] <SpeedEvil> yeah
[11:47] <SpeedEvil> :/
[11:47] Action: SpeedEvil is trying to diet.
[11:47] <SpeedEvil> Probably should have thought of that before I did massive monthly shop
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[12:18] <SpeedEvil> http://img.thedailywtf.com/images/200910/err1/wtf_walpha_weather.gif :)
[12:20] <russss> hahaha
[12:20] <russss> awesome
[12:27] <SpeedEvil> http://thedailywtf.com/Articles/Security-Index-out-of-Bounds.aspx :)
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[13:07] <Laurenceb> http://physics.fullerton.edu/~jimw/general/
[13:07] Action: Laurenceb isnt sure of the crackpot index of that
[13:10] <SpeedEvil> Yeah.
[13:10] <SpeedEvil> http://en.wikipedia.org/wiki/Brane - for example - could in many cases have come straight out of star-trek technical manuals
[13:10] <SpeedEvil> You just can't tell.
[13:11] <SpeedEvil> http://en.wikipedia.org/wiki/D-brane is 'better'
[13:14] <Laurenceb> I think that work I linked is talking about inertia in terms of emitted gravity waves
[13:14] <Laurenceb> which sort of makes sense
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[13:14] <SpeedEvil> To misquote a film.
[13:15] <SpeedEvil> Show me the experimental divergance between your theory and current understanding.
[13:16] <Laurenceb> http://physics.fullerton.edu/~jimw/nasa-pap/
[13:17] <SpeedEvil> I vaguely recall further work was done on this with no results
[13:19] <Laurenceb> http://angryflower.com/experi.html
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[13:42] <Laurenceb> I think the idea of emitting high frequency gravity waves to carry off momentum may have promise
[13:42] <Laurenceb> not sure if its any better than a laser
[13:42] <Laurenceb> - power wise
[13:45] <SpeedEvil> Or any ohter photon drive
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[14:34] <edmoore> just got an email from someone who has found a balloon payload in a field near sudbury
[14:34] <edmoore> any ideas anyone?
[14:37] <SpeedEvil> wasn't me. (sending or recieving)
[14:38] <edmoore> rjharrison: ping re above
[14:40] <Laurenceb> sudbury where?
[14:40] <Laurenceb> - which sudbury
[14:41] <Laurenceb> Suffolk ?
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[14:42] <Jon_Apex> hi all
[14:44] <edmoore> Laurenceb: i assume so
[14:44] <edmoore> it's very near james
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[14:50] <Randomskk> Jon_Apex: you around?
[14:50] <Jon_Apex> yep. doing maths
[14:51] <Randomskk> tasha and i are meeting up in her room at 3 for some maths, you are invited
[14:51] <Jon_Apex> Randomskk: fantastic. ha. cheers
[14:51] <Laurenceb> http://i.imgur.com/CGjRM.jpg
[14:51] <Laurenceb> maths eh?
[14:52] <Randomskk> Laurenceb: you of all people should know about examples papers
[14:52] <Laurenceb> your doing maths?
[14:53] <Laurenceb> remember to take your equipment
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[14:59] <edmoore> "It was released on the 21st of this month at 11:25 zulu if that helps."
[14:59] <edmoore> latest email from this bloke
[14:59] <edmoore> that's not one of us, I don't think
[15:00] <Randomskk> some mysterious other group launching balloons
[15:00] <edmoore> maybe met office
[15:00] <Randomskk> don't they normally have notes just saying "please throw me away" or whatever?
[15:02] <Laurenceb> it has a note of release date?
[15:03] <Laurenceb> that cant be us - sounds like met office
[15:07] <Laurenceb> SpeedEvil: rather than your crazy hoverboard, why not make a small electric single person microlight?
[15:07] <SpeedEvil> Because that has a really low exploding helicopter quotient.
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[15:08] <SpeedEvil> If I was going to propose something sane, it'd be a flapping glider.
[15:08] <SpeedEvil> As flapping is _much_ more efficient than a prop.
[15:09] <edmoore> jcoxon:
[15:09] <edmoore> "It was released on the 21st of this month at 11:25 zulu if that helps."
[15:09] <jcoxon> not one of ours
[15:09] <jcoxon> we are never that exact :-p
[15:09] <edmoore> so it seems
[15:09] <jcoxon> it was released sometime on xx would be our style
[15:10] <jcoxon> :-p
[15:10] <jcoxon> i guess a pic will solve the issue
[15:10] <SpeedEvil> or a peek at any data
[15:12] <Laurenceb> http://www.lisa-airplanes.com/fr/hy-bird/
[15:12] <jcoxon> we;ve only every launched one flight on the 21st of any month
[15:12] <jcoxon> and that was nova 14
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[15:17] <edmoore> that certainly wasn't at 11.25
[15:18] <jcoxon> oh and we never get zulu time right :-p
[15:18] <jcoxon> i suspect it was from a balloon race
[15:18] <jcoxon> or something like that
[15:19] <edmoore> he's going to get a photo to me in the next couple of days, he says
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[15:19] <rjharrison_> Hi all
[15:20] <rjharrison_> jcoxon: potential launch window this thursday?
[15:20] <Laurenceb> vector or scalar potential?
[15:20] <edmoore> out.
[15:21] <jcoxon> rjharrison let me have a look
[15:22] <jcoxon> yes good chance
[15:22] <jcoxon> what pressure are you looking at?
[15:22] <jcoxon> 300mb or 200mb?
[15:23] <rjharrison_> 200mb
[15:24] <jcoxon> okay cool
[15:24] <jcoxon> yeah the JS is higher then usual
[15:24] <rjharrison_> Will keep an eye on it
[15:25] <rjharrison_> It doesn't look to good in the predicitor at the moment
[15:25] <rjharrison_> SpikeUK just mailed me at the same time saying that Thursday wasn't bad
[15:26] <jcoxon> worth planning towards
[15:26] <jcoxon> bbiab
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[15:44] <junderwood> rjharrison. I'm playing with some software which will upload flight data and listener to the tracker (and much more besides). Whenever I test it, I end up cluttering the tracker with random junk. Do you have a "development" tracker for testing stuff or would it be possible to set one up?
[15:44] <edmoore> oh RocketBoy : got an email that a payload has been found in sudbury by a farmer
[15:44] <edmoore> not one of ours or anyone's we can think of?
[15:45] <junderwood> "Genuine" met balloon / payload?
[15:46] <MikeMc> evening all
[15:48] <edmoore> thinking so
[15:49] <SpeedEvil> pick it up, and look at the payload?
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[15:55] <edmoore> jcoxon: 40
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[15:58] <jcoxon> junderwood, what you working on?
[15:58] <jcoxon> i'm sure we can set up a dev tracker
[16:00] <junderwood> An application to harvest data from fldigi and (eventually) the tracker and combine it with atmosphere (GFS) and payload data to continuously predict landing site throughout flight
[16:00] <jcoxon> wow
[16:00] <junderwood> Will eventually also get listener position from GPS and vector towards landing site
[16:01] <junderwood> and auto-tune fldigi
[16:01] <jcoxon> so is it an adaptation of fldigi or a seperate program?
[16:01] <junderwood> Completely separate program.
[16:02] <junderwood> Using the XML-RPC interface in fldigi to control it
[16:02] <jcoxon> :-) good old xml-rpc
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[16:02] <junderwood> written using wxWidgets so it should be relatively easy to cross-platform.
[16:02] <jcoxon> thats what i used on the early versions of the python script
[16:02] <SpeedEvil> Auto-tune is dead - hadn't you heard?
[16:03] <jcoxon> junderwood, any reason for not instead basing it on the dl-fldigi code?
[16:03] <jcoxon> or do you feel its better keeping it seperate
[16:04] <rjharrison_> ping edmore
[16:04] <junderwood> I would rather keep it separate from fldigi. By making a fork of fldigi, you have to update it every time fldigi changes. I don't see the changes being accepted into the fldigi mainline - they're too specific
[16:04] <rjharrison_> junderwood: keep playing
[16:04] <junderwood> (and I don't know my way around FLTK!!)
[16:04] <rjharrison_> don't wory about messing the tracker I'll clean it before launch
[16:04] <junderwood> Ta
[16:04] <Laurenceb> I'm writing a decoder from scratch
[16:04] <Laurenceb> in c
[16:05] <jcoxon> junderwood, fair enough
[16:05] <Laurenceb> junderwood: want to share code?
[16:05] <Laurenceb> I'm too busy atm to do any more work
[16:05] <Laurenceb> but I think most of the details have been addressed
[16:06] <junderwood> Will probably open-source it once I've got it to a stage where it's usable.
[16:06] <russss> has anyone looked at gnu radio for decoding? it has support for sound card input.
[16:06] <Laurenceb> easier to code from scratch
[16:07] <jcoxon> russss, not to my knowledge
[16:07] <jcoxon> fldigi does the job pretty well
[16:07] <Laurenceb> I'll try and get some code up on the wiki this evening
[16:07] <edmoore> had a play, but it's a bit of a sledgehammer to a nut
[16:07] <Laurenceb> yeah
[16:07] <edmoore> it's like giving someone a cnc mill when they just want to drill a couple of holes
[16:07] <Laurenceb> if you have an icom you can use libhamlib to control the radio
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[16:08] <russss> well the advantage is that you can componentise it, so other people can reuse your components
[16:08] <rjharrison_> edmoore: any news on that payload?
[16:08] <edmoore> nope
[16:09] <rjharrison_> Weird
[16:09] <rjharrison_> It's not mine. Must be one of steves or jc's
[16:09] <edmoore> indeed that's a nice touch. Though again, there's a reasonably high barrier to entry, in terms of taking the time to get your head around its structurer
[16:09] <edmoore> or just a met-office one
[16:09] <rjharrison_> yep v. likely
[16:09] <jcoxon> its not mine if that note is correct
[16:09] <russss> yeah and it's hideously poorly documented
[16:09] <jcoxon> never written on there
[16:10] <edmoore> right, i should have left to be productive ages ago :) bbl
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[16:11] <rjharrison_> Tuesday the 10th november looks great too :)_
[16:11] <rjharrison_> Night be a bit far to predict accuratly
[16:11] <jcoxon> rjharrison_, little bit in advance
[16:12] <jcoxon> rjharrison_, is PM working for you?
[16:12] <rjharrison_> but there is loads of pink over the uk
[16:12] <Laurenceb> can I stick something on ze bottom?
[16:12] <Laurenceb> pleasey pleasey please please
[16:15] <jcoxon> rjharrison_ which launch will thurs potentially be?
[16:15] <jcoxon> float or alt record?
[16:17] <MikeMc> One NTX2-434.650-10 on it's way from Radiometrix :)
[16:18] <jcoxon> MikeMc, great
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[17:39] <Laurenceb> fergusnoble: ping
[17:39] <fergusnoble> Laurenceb: hi
[17:39] <Laurenceb> hi there, how is your physics?
[17:39] <fergusnoble> hows it going?
[17:39] <Laurenceb> not too bad thanks
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[17:40] <Laurenceb> I was going to ask you something :P
[17:40] <fergusnoble> yeah its good, lots of interesting courses this year
[17:40] <fergusnoble> ok, shoot
[17:40] <Laurenceb> so , in a capacitor the dielectric has a molecular structure that can be distorted
[17:40] <Laurenceb> so atoms move up/down ect
[17:41] <Laurenceb> anyway, if you put this in a gravitational field, they will gain/lose energy
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[17:41] <Laurenceb> and that means mass right?
[17:41] <fergusnoble> yeah
[17:41] <Laurenceb> so as they are vibrating up/down, do we get a force?
[17:41] <Laurenceb> i.e. cap with AC going in in a gravity well, does it feel a force
[17:42] <Laurenceb> if its orientated correctly
[17:42] <fergusnoble> you mean, it will feel heavier if you put more energy into the cap?
[17:42] <fergusnoble> i think that is the case
[17:42] <Laurenceb> nope
[17:42] <Laurenceb> its not that
[17:42] <Laurenceb> thats obviously true
[17:43] <Laurenceb> I mean a force when theres AC going in
[17:43] <fergusnoble> why is there a force on something if it oscillates?
[17:43] <Laurenceb> as the mass is position dependant
[17:43] <Laurenceb> due to the gravitational potential energy
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[17:44] <fergusnoble> i guess so... the effect would be tiny though
[17:44] <Laurenceb> not that tiny it seems
[17:44] <Laurenceb> in certain circumstances you can get large forces
[17:45] <fergusnoble> and the force would just be like a modulation of the weight of the capacitor
[17:45] <Laurenceb> its a case of getting insane accelerations
[17:45] <Laurenceb> no
[17:45] <Laurenceb> its a force in newtons
[17:45] <Laurenceb> but yeah it would scale with g
[17:45] <Laurenceb> so I guess thats one way to look at it
[17:46] <fergusnoble> i mean weight rather than mass, as in it would feel lighter when all the atoms or whatever are in one direction
[17:46] <fergusnoble> but yeah
[17:46] <Laurenceb> as a thought experiment I was looking at RF going into a cloud of free electrons
[17:46] <Laurenceb> its possible to get them to accel at several times the gravitational accel quite sensibly
[17:47] <fergusnoble> yup
[17:48] <Laurenceb> but where is the momentum coming from...
[17:48] <Laurenceb> I guess from the potential energy field
[17:48] <fergusnoble> from the photons
[17:48] <Laurenceb> gravitational potential energy in this case
[17:48] <fergusnoble> ok
[17:49] <Laurenceb> its not a simple case of bouncing photons off
[17:49] <fergusnoble> i was thinking about the RF
[17:49] <fergusnoble> but yeah
[17:49] <Laurenceb> thats different and doesnt require an externally applied potential energy field
[17:49] <Laurenceb> the potential energy field is what causes the time variant mass
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[17:51] <Laurenceb> so momentum must be transferred to whatever is causing the field...
[17:51] <fergusnoble> so I think its like the case where you have a classical SHO in a constant gravitational field, all the effect is is to change the equilibrium position, but in your case its not a constant g field so you could have a small second order term as well
[17:51] <fergusnoble> (second order as the g filed varies linearly)
[17:52] <fergusnoble> ok, so some momentum is transfered to the earth, thats newton's 3rd law
[17:52] <Laurenceb> hmm ot exactly
[17:52] <Laurenceb> the rest mass of the oscillating mass changes with its position
[17:53] <fergusnoble> no, the rest mass never changes
[17:53] <Laurenceb> as it moves up it has more mass
[17:53] <Laurenceb> due to GPE
[17:53] <fergusnoble> the mass will change but the rest mass is constant
[17:53] <Laurenceb> hmm
[17:54] <Laurenceb> yeah ok thats the definition of rest mass
[17:54] <Laurenceb> but for inertia dont we have to account for GPE ?
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[17:54] <Laurenceb> or any sort of potential energy
[17:55] <Laurenceb> m_inertial=m_rest+potential_energy/c^2
[17:55] <fergusnoble> i think this is all on slightly dodgy teritory as we are picking and choosing things from relativity theory but then also applying calssical ideas of GPE and inertial mass etc.
[17:56] <fergusnoble> but it sounds about right to me
[17:56] <Laurenceb> yeah... but I was assuming the velocities are non relativistic
[17:56] <Laurenceb> so we ignore all time/lenght dilation and all that
[17:56] <fergusnoble> but we are talking about gravity
[17:56] <fergusnoble> but anyway, everything you've said sounds sensible enough
[17:57] <Laurenceb> we could be talking about electrostatic potential
[17:57] <Laurenceb> and a mechanical oscillator
[17:57] <fergusnoble> I agree that the mass changes
[17:57] <fergusnoble> does that lead to something wierd happening?
[17:57] <Laurenceb> if its an oscillator that leads to a force
[17:58] <MikeMc> wow this discussion is getting esoteric
[17:58] <Laurenceb> as the mass is position dependant
[17:58] <Laurenceb> :D
[17:58] <Laurenceb> ah hang on a minute
[17:59] <Laurenceb> your gaining and losing mass as you travel in opposite directions
[17:59] <fergusnoble> sounds to me like it would show up as a component of the weight
[17:59] <Laurenceb> up and down the potential well
[17:59] <fergusnoble> would need to do the math and find the functional form of the force
[17:59] <Laurenceb> thats some sort of momentum problem
[18:00] <Laurenceb> inertial mass= gravitational mass right
[18:00] <fergusnoble> yup
[18:00] <Laurenceb> hmm so you gain and lose mass in opposite directions of travel
[18:00] <Laurenceb> how can that be so
[18:00] <Laurenceb> where does the momentum come from
[18:01] <fergusnoble> hmm, although the mass is just the potential energy from the g field, so maybe this force ends up equating to the driving force on the electron
[18:01] <fergusnoble> would have to do the math at this point i think
[18:02] <Laurenceb> I think the general point is : I move up a potential, gaining mass, how does this obey conservation of momentum
[18:02] <Laurenceb> I'll ask on #physics
[18:06] <fergusnoble> i dont see any paradox though
[18:07] <fergusnoble> right, going to get some food, brb
[18:07] <Laurenceb> so an electron fired up a potential will lose velocity
[18:07] <Laurenceb> doh
[18:07] <Laurenceb> ok will lose more than may be expected :P
[18:07] <Laurenceb> as the mass increases as well
[18:09] <Laurenceb> ah got it
[18:09] <Laurenceb> if conservation of momentum applies and the mass just comes from "nowhere" then theres no force
[18:10] <Laurenceb> and yeah thats the way to approach the problem
[18:10] <fergusnoble> should all come out in the wash if you do it with the relativistiv 4-momentum formulation
[18:11] <Laurenceb> yeah
[18:21] <Laurenceb> http://www.youtube.com/watch?v=6IyU02E9bdM
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[18:37] <fergusnoble> wtf?
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[18:49] <Laurenceb> http://www.youtube.com/watch?v=UHOTOA2bLQs
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[19:52] <Paul2> hey people
[20:09] <MikeMc> hey
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[20:42] <jcoxon> hey rjharrison
[20:47] <fergusnoble> jcoxon, rjharrison hi!
[20:47] <jcoxon> hey fergusnoble
[20:47] <fergusnoble> hows it going? how was your trip?
[20:48] <jcoxon> yeah my trip was great
[20:50] <jcoxon> how are you?
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[20:53] <fergusnoble> not bad, not bad
[20:53] <fergusnoble> hectic summer but im sure you heard about it from ed
[20:54] <jcoxon> yeah sounded good
[21:02] EI5GTB (n=Paul@213-202-156-67.bas503.dsl.esat.net) joined #highaltitude.
[21:02] <jcoxon> wow the numbers on this channel have rocketed up
[21:02] <jcoxon> hi to any new people
[21:03] <Randomskk> hi
[21:03] <Randomskk> I'm not really sure if I still count as new :P
[21:03] <jcoxon> nah you've spoken before
[21:03] <Paul2> hi
[21:03] <EI5GTB> evening
[21:03] <Paul2> I'm new. Since today
[21:03] <jcoxon> hi Paul2 welcome to #highaltitude
[21:04] <jcoxon> :-)
[21:04] <jcoxon> hey EI5GTB, long time no see
[21:04] <Paul2> hi :)
[21:05] <SpikeUK> Hi Paul2! What brings you here?
[21:05] <Paul2> Someone I spoke to last Wednesday. I completely forgot their name (I'm good like that)
[21:05] <EI5GTB> jcoxon: yea, long time indeed, how are things?
[21:05] <jcoxon> oh that was me (James)
[21:05] <Paul2> (hackspace related)
[21:05] <Paul2> Ah yeah hi :)
[21:05] <Paul2> I'm the person who wandered in late
[21:05] <jcoxon> EI5GTB, good, some cool flights recently
[21:05] <EI5GTB> whats new round here?
[21:05] <EI5GTB> cool cool
[21:05] <jcoxon> cusf managed an uplink
[21:06] <EI5GTB> nice 1
[21:06] <jcoxon> we are working on our trans-a flight
[21:06] <EI5GTB> ool
[21:06] <jcoxon> and have been trying out some latex floater flights
[21:07] <EI5GTB> nice
[21:07] <EI5GTB> dam, i still havnt gotten permission from the IAA to launch a baloon
[21:07] <EI5GTB> i need to send them a safety statment
[21:09] <jcoxon> EI5GTB, one day you'll bite the bullet and pop over to launch with use :-p
[21:09] <jcoxon> Ares 1-x launch tomororw
[21:09] <EI5GTB> yup
[21:09] <EI5GTB> hmm, i wonder could i catch a plane in time
[21:10] <jcoxon> us*
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[21:16] <SpeedEvil> EI5GTB: FOIA the met-office for any accidents ever involving balloons
[21:16] <SpeedEvil> EI5GTB: And the number launched.
[21:16] <EI5GTB> hmm
[21:16] <EI5GTB> ok
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[21:21] <jcoxon> oooo my seeedstudio pcbs have been shipped
[21:22] <Randomskk> lol
[21:22] <Randomskk> did you go for DHL or EMS
[21:22] <russss> oh thanks for the ares 1-x reminder. For some reason I thought I was following the twitter account but I wasn't.
[21:22] <jcoxon> Randomskk, the slow one
[21:22] <Randomskk> jcoxon: I paid for DHL and they shipped it EMS, where EMS is the slow one
[21:22] <jcoxon> i couldn't bring myself to pay more for p&p then the cost for boards
[21:22] <Randomskk> a month after I ordered they eventually arrived
[21:22] <Randomskk> with almost all the silkscreen missing D: D: D:
[21:23] <jcoxon> haha
[21:23] <Randomskk> the white soldermask is lovely and it is a fairly good price for qty 10, but they cut off all silk smaller than some arbitrary size, despite it passing their DRM and them emailing saying the gerbers were fine
[21:23] <Randomskk> so now I have these lovely boards with no labels on any of the pins
[21:23] <Randomskk> and it's a development board...
[21:23] <jcoxon> oh
[21:23] <jcoxon> my boards are so simple i'll survive
[21:24] <Randomskk> you hopefully won't even have any problems anyway
[21:25] <jcoxon> well hopefully they don't get caught in the postal strike
[21:25] <jcoxon> or perhaps the next postal strike :-p
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[21:34] <jcoxon> Randomskk, i went for the opensource option
[21:34] <jcoxon> so will only get 5 i guess
[21:37] <Randomskk> even cheaper too though
[21:42] <jcoxon> yeah that was my thinking
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[21:56] <MikeMc> hello
[21:58] <jcoxon> hey MikeMc
[21:58] <MikeMc> hey
[22:00] <Randomskk> oh rage. I decided to try and get this motor driver working, write a bit of test code, get ready to program it... realise I no longer have the required usb cable with me
[22:02] Action: natrium42 sets mode +MacGuyver on Randomskk
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[22:02] <jcoxon> oops
[22:03] <Randomskk> all I have is a load of miniusb but this needs normal usb a. and then I thought "well I don't need to program this on the real atmega, I could just use one of these aruinos"
[22:03] <Randomskk> then I realised the arduinos need the same usb. sob.
[22:03] <Randomskk> I'll get it back sometime tomorrow I guess
[22:03] <Randomskk> in the meantime, I write code and just hope it maybe works
[22:04] <jcoxon> find someone with a printer :-)
[22:04] <jcoxon> steal their cable
[22:04] <SpeedEvil> natrium42: I assume you know of no way to do other than the default logging on the venus 6's?
[22:04] <Randomskk> hehe
[22:04] <natrium42> SpeedEvil: yeah, sorry
[22:05] <jcoxon> i always forget that my avrisp mkII has a nice usb cable
[22:05] <jcoxon> for that sort of job
[22:06] <natrium42> just do a macguyver...
[22:06] <natrium42> "you have this broken r/c car and chewing gum to work with"
[22:06] <natrium42> 15 seconds later...
[22:06] <Randomskk> no soldering iron either
[22:06] <natrium42> "there you go, it's programming the avr"
[22:06] <jcoxon> bluetak!
[22:08] <natrium42> http://maclost.ytmnd.com
[22:10] <Randomskk> a happy ending
[22:10] <jcoxon> yay \o/
[22:22] <MikeMc> :D
[22:22] <MikeMc> I've added my project to teh Wiki
[22:25] <jcoxon> ooo cool
[22:26] <natrium42> link plz
[22:26] <natrium42> nvm, i am just lazy
[22:27] <MikeMc> Nothing exciting - http://ukhas.org.uk/projects:earthshine
[22:27] <jcoxon> MikeMc, does sprintf with floats act weird on arduino?
[22:27] <MikeMc> yeah it only works for integers
[22:28] <jcoxon> stupid sprintf
[22:28] <MikeMc> convert it to a string first
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[22:28] <jcoxon> having issues with altitudes above 32km or so
[22:28] <MikeMc> itoa()
[22:28] <jcoxon> as it overflows ints
[22:28] <Randomskk> that's just for int
[22:28] <Randomskk> hence the i
[22:28] <Randomskk> iirc?
[22:29] <bittwist> http://www.flickr.com/photos/28208534@N07/4047355843/
[22:29] <MikeMc> how many decimal points do you need?
[22:29] <natrium42> MikeMc: cool, looks good
[22:30] <jcoxon> none really
[22:30] <Randomskk> just (int) then I guess
[22:30] <jcoxon> basically the gps lib either gives it out as int or float
[22:30] <Randomskk> and then itoa
[22:30] <jcoxon> but if its above 32km it'll overflow and go crazy
[22:30] <jcoxon> if you use an int
[22:30] <MikeMc> you can always multiply by multiples of 10, convert to string then add a , wherever you want it
[22:31] <Randomskk> (long int)
[22:31] <MikeMc> i.e. 123.45 multipled by 100 = 12345 print first 3 chars then add a . then print last 2
[22:31] <jcoxon> Randomskk, guess i could edit the lib
[22:33] <MikeMc> or use uint_16, uint_32, etc.
[22:33] <jcoxon> i'll have a play
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[22:34] <Randomskk> using the proper specifiers is indeed probably better than "long long int" and all that
[22:34] <Randomskk> though I do prefer "unsigned long long int" to "uint_64" or whatever the equivilent is
[22:35] <MikeMc> i like the uint's as it shows how many bits are used
[22:35] <MikeMc> int's can have different bit lengths in different platforms
[22:35] <Randomskk> yea. they are also more concise and consistent across changing platforms
[22:35] <MikeMc> yup
[22:35] <Randomskk> but I prefer typing unsigned short int to uint_8 for some reason
[22:36] <Randomskk> especially if I can throw some more adjectives in there
[22:36] <Randomskk> like volatile or const
[22:37] <MikeMc> agreed it is a bit more 'friendly'
[22:38] <Randomskk> I just like typing lots of descriptives for my variables :P
[22:45] <jcoxon> hmmm sprintf doesn't seem to like %l
[22:46] <MikeMc> long int?
[22:47] <jcoxon> yeah
[22:47] <Randomskk> I thought that was just a case of specifying another thing
[22:47] <Randomskk> or is that just shorts
[22:47] <Randomskk> like %hd is a short int or whatever
[22:47] <MikeMc> is it a long int that has been passed to it?
[22:47] <jcoxon> yes
[22:47] <Randomskk> yea, it is. so %ld
[22:47] <Randomskk> %ld is a long int
[22:48] <Randomskk> signed lont int, at that
[22:48] <Randomskk> %lu would be unsigned long
[22:48] <jcoxon> oh right
[22:48] <jcoxon> oops
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[00:00] --- Tue Oct 27 2009