highaltitude.log.20080419

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[00:51] <jcoxon> hey all
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[03:33] <Kornholijo> y0
[03:38] <Kornholijo> anyone here =(?
[03:39] <akawaka> yes
[03:40] <Kornholijo> sup
[03:41] <fnoble> hello, im here-ish too
[03:42] <fnoble> did you get an further with your plans?
[03:42] <Kornholijo> not really, just some planning, was busy otherwise ;/
[03:43] <akawaka> i would recommend buying a balloon
[03:43] <akawaka> once you have a balloon you'll feel stupid not doing anything with it
[03:43] <Kornholijo> hahah
[03:43] <akawaka> our project only felt real the day the balloons arrived
[03:44] <Kornholijo> im not completely sure about it
[03:47] <fnoble> go for it :) definitely getting something small to make you fell more committed is good
[03:58] <Kornholijo> well im trying to get something but I need much stuff, i moved from europe and left all good stuff there :( (parts, equipment etc, friends)
[03:58] <Kornholijo> i could get almost any part I needed etc =(
[03:58] <Kornholijo> bah...
[03:59] <fnoble> where were you from in europe?
[03:59] <Kornholijo> lithuania
[03:59] <Kornholijo> baltics :p
[04:00] <Kornholijo> it was a small country, you can get everything you need almost in 1 day...
[04:00] <Kornholijo> not like us or canada
[04:01] <fnoble> or the UK, our postal service is awful
[04:02] <Kornholijo> heh
[04:02] <Kornholijo> i like the subway though :]
[04:02] <Kornholijo> (when I was in london)
[04:03] <fnoble> dont talk to me about public transport :) im in devon, in the middle of nowhere
[04:03] <Kornholijo> haha
[04:03] <fnoble> there IS a bus every hour, but its a half hour walk to the bus stop
[04:03] <fnoble> or the nearset shop
[04:04] <akawaka> i know what thats like
[04:04] <Kornholijo> why live in middle or nowhere?
[04:04] <akawaka> i grew up in ireland
[04:04] <fnoble> akawaka: in the US now?
[04:04] <akawaka> yeah
[04:05] <fnoble> its late over here in europe, so its a safe guess
[04:05] <Kornholijo> fuck I hate us
[04:05] <fnoble> need to finish some maths papers though
[04:05] <Kornholijo> they try to get money from everything
[04:05] <Kornholijo> :o
[04:08] <Kornholijo> hmm..
[04:08] <Kornholijo> someone got a way to make money from air?
[04:11] <Kornholijo> please
[04:13] <fnoble> start a wind farm?
[04:13] <akawaka> and power a money print press with it
[04:14] <Kornholijo> if i had a money printer i would
[04:14] <Kornholijo> anyone got one :D?
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[11:03] <Hiena> Good evening!
[11:06] <\\dan\\> Morning
[11:12] <jcoxon_> morning
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[11:47] <jcoxon> urgh, my poor apple ibook is slowly dying
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[12:04] <Hiena> Stop it's suffering! Kill it!
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[12:09] <\\dan\\> ive just found some cool bare-bones Siemens GPRS modems in Farnell
[12:11] <jcoxon> Hiena, i can't its my favourite laptop
[12:11] <jcoxon> \\dan\\, link?
[12:11] <\\dan\\> just getting noi
[12:11] <\\dan\\> now*
[12:13] <\\dan\\> 35*32.5*2.95 mm in size
[12:13] <\\dan\\> http://uk.farnell.com/1305958/mechanical-office-workplace/product.us0?sku=SIEMENS-MC55-MODULE
[12:14] <jcoxon> nice
[12:15] <\\dan\\> they will work down to -20 deg/c
[12:16] <jcoxon> i think they are using it on the gumstix goliathgps-vx daughter board
[12:18] <\\dan\\> i really like how midgeted that module is, shame abouyt the price though
[12:22] Nick change: \\dan\\ -> ][dan][
[12:26] <jcoxon> thats about what gms/gprs modules cost
[12:26] <][dan][> yeah
[12:29] <jcoxon> ][dan][, so dan are you working on a balloon payload (don't think i've seen you on here before)
[12:32] <][dan][> yeah, its been something ive been interested in doing for a while, and its only this coming summer that im going to have the time to do it. GCSE's over in a few weeks so ill finally have the time to do it.
[12:32] <jcoxon> cool
[12:33] <][dan][> im cheap so i might just use a radio modem. im not sure yet
[12:33] <jcoxon> ][dan][, you in teh UK?
[12:34] <][dan][> yeah, 16 lol
[12:34] <jcoxon> just to warn you about the strict radio rules
[12:34] <jcoxon> check out the wiki for more info
[12:35] <][dan][> well what i was thinking was to pump out on the same frequency as Radio 1 at 7 or 8 watts =P
[12:35] <][dan][> Its a red tape minefield
[12:35] <jcoxon> haha
[12:35] <jcoxon> you'd get a fairly large audience
[12:35] <jcoxon> :-p
[12:35] <][dan][> couple of miles up yeah i would
[12:36] <][dan][> i wonder if anyone would be able to understand 96000 baud lol
[12:36] <jcoxon> scarily some one might
[12:37] <][dan][> are radar reflectors required? i know they are in the US
[12:37] <jcoxon> nope
[12:37] <jcoxon> actually interestingly there was a MOD report saying that statistically they are more 'dangerous'
[12:38] <jcoxon> or something along those lines
[12:39] <jcoxon> atc don't really seem to care
[12:44] <][dan][> good
[12:44] <][dan][> one less thing
[12:45] <][dan][> hmmmm
[12:45] <][dan][> 7 watt transmitter pumping out slipknot a couple of miles up =P
[12:46] <jcoxon> i think they might put a stop to our launch permission :-p
[12:46] <][dan][> lol
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[12:46] <][dan][> how difficult is it to get launch permission?
[12:47] <jcoxon> not that difficult
[12:47] <jcoxon> you'll need to give at least 28 days noticed
[12:47] <jcoxon> but you can get a large window and then chose to launch in it
[12:47] <jcoxon> by giving a few days notice
[12:47] <jcoxon> we have a semi-continous permission in cambridge
[12:47] <jcoxon> so if you want you could launch through us
[12:48] <][dan][> cool
[12:51] <jcoxon> that said it runs out at the end of a month
[12:51] <jcoxon> but we have reapplied and are waiting for a new permission
[12:52] <][dan][> how often do you guys launch?
[12:52] <jcoxon> it varies
[12:52] <jcoxon> i'm planning to launch next weekend
[12:53] <jcoxon> it depends when people have a payload ready and there is time
[12:53] <jcoxon> that said the weather is better in the summer
[12:53] <jcoxon> so there are more then
[12:53] <][dan][> sorry im asking loads of questions
[12:54] <jcoxon> nah its no problem
[12:54] <jcoxon> i'm here for another 5 mins so ask away
[12:54] <jcoxon> then i've got to revise...
[12:54] <][dan][> k
[12:54] <][dan][> haha yes revison
[12:54] <][dan][> how easy are the payloads to track down?
[12:55] <jcoxon> hehe
[12:55] <jcoxon> it really varies
[12:55] <jcoxon> the problem is the sea
[12:55] <][dan][> yes
[12:55] <jcoxon> you are never further then 70miles from teh sea in teh UK
[12:55] <jcoxon> the* the*
[12:55] <][dan][> mmm
[12:55] <jcoxon> but
[12:55] <jcoxon> with good weather
[12:55] <jcoxon> and a cutdown should be fine
[12:56] <jcoxon> basically if it comes down on land you'll find it (or it'll be found and returned)
[12:56] <][dan][> yeah
[12:56] <jcoxon> its probably best to have radio for the flight
[12:56] <][dan][> tie some fishing line to it? =P
[12:56] <jcoxon> and then gsm when it lands (as radio isn't that great)
[12:56] <jcoxon> ][dan][, thats one option :-)
[12:57] <][dan][> has that actually been done before?
[12:57] <jcoxon> what? fishing line ?
[12:57] <][dan][> yeah lol
[12:57] <jcoxon> nah
[12:57] <jcoxon> hehe
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[12:59] <][dan][> the one thing i have seen is people launching gliders
[13:00] <jcoxon> sort of
[13:00] <jcoxon> :-)
[13:00] <jcoxon> only one project has actually succeeded
[13:00] <jcoxon> but lots of people are trying
[13:01] <jcoxon> right i'll bbl
[13:01] <][dan][> b
[13:01] <][dan][> thanks jcoxon
[13:01] <jcoxon> np
[13:01] <][dan][> ttyl, bye, etc
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[13:17] <jatkins> hi all
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[13:45] <][dan][> hey
[14:05] <][dan][> theres a block around 400mhz that doesnt require a licence isnt there?
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[14:17] <][dan][> hi
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[16:53] <Cooleo> Hi, Is anyone about?:)
[16:54] <Cooleo> Im thinking about doing a High Altiude Project, Ill check back later
[16:59] <Hiena> Cooleo, not thinking, just do it.
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[17:00] <Laurenceb> hi folks
[17:01] <Laurenceb> if I've got a large project with multiple c files, how can I create a gloable variable that can be accessed from all the files?
[17:05] <fnoble> got a mental block - how'd you integrate (x^2 - x + 1)^(-3/2)?
[17:07] <fnoble> Laurenceb: just define it in all files
[17:07] <fnoble> only prefix all but one definition with "extern"
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[17:17] <Cooleo> Hiena, I dont know where to start really, I saw they have weather balloons on there for £11/$22. But after buying that, I would be lost on what to do next.
[17:17] <Cooleo> *on ebay
[17:18] <Hiena> Cooleo, start with the telemetry at first.
[17:18] <Hiena> You could leave the balloon later.
[17:18] <Cooleo> Yeah, Ok.
[17:18] <Cooleo> I doubt its a good idea to launch round here, Only 4 miles away from the sea which by my guess it would fly into there.
[17:18] <fnoble> Cooleo, where are you?
[17:19] <Hiena> You need a stable data downstream at first. After that you could start looking for a balloon.
[17:19] <Hiena> The another thing is the weather forecast. No launch at the strong weather conditions.
[17:19] <Cooleo> I was thinking of just attaching a 3G Phone and Video calling it from another phone. But I guess that would only work uptill a certain Point
[17:19] <Cooleo> Fnoble, Lowestoft, Suffolk, UK
[17:20] <fnoble> yeah, phones cut out at about 1km
[17:20] <fnoble> get confused because they see too many cells
[17:20] <Laurenceb> fnoble: cant you call x^2-x+1 f(x)
[17:20] <Laurenceb> then integrate by parts?
[17:20] <Laurenceb> or... no
[17:20] <Laurenceb> ignore that :P
[17:21] <Laurenceb> I hate integration
[17:21] <Cooleo> Would it be such a bad idea to attach 1KM worth of high grade rope and attach it to myself so it doesn't go any higher? So then it can be reusable
[17:22] <Laurenceb> fnoble: I've got extern volatile u08 pwm_counter=0x00; in one file
[17:22] <Laurenceb> then volatile u08 pwm_counter=0x00; in the other
[17:22] <Laurenceb> but its giving me "multiple definitions"
[17:23] <fnoble> cooleo: 1km or rope will be heavy :) and 1km is quite low altitude
[17:24] <fnoble> Laurenceb: try not assigning it a value where you do extern
[17:24] <Cooleo> Its that im going to have trouble finding it again, People knick whatever they can find here, and I dont have the money to spend $100 on a onetime use GPS
[17:24] <fnoble> well, there are two common ways of knowing where it went:
[17:25] <fnoble> either use a radio transmitter and get it to send you back gps coords
[17:25] <fnoble> or use a phone to text you back the gps coords when it lands
[17:25] <fnoble> we usually try to have both
[17:25] <Cooleo> Wouldn't the GPS be expensive?
[17:26] <Laurenceb> yey compiles :P
[17:26] <fnoble> we tend to use bare gps modules rather then off the shelf units, which are a lot cheaper
[17:26] <Laurenceb> thanx fnoble, sorry I cant do the integral :-/
[17:26] <fnoble> np
[17:26] <Cooleo> So, Overall, How much is the average launch? Inc the GPS etv
[17:26] <Cooleo> *etc
[17:26] <Laurenceb> try using mathmatica or something, it might be insightful
[17:27] <fnoble> yeah mathematica gives me the answer, but i cant see how it got it :)
[17:27] <Laurenceb> yes
[17:27] <Laurenceb> well what is the answer?
[17:29] <fnoble> 2(2x-1) / 3(1-x+x^2)^(1/2)
[17:29] <fnoble> Cooleo, it depends a lot on what kind of payload you send
[17:30] <fnoble> also how much electronics experience do you have?
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[17:31] <Cooleo> Fnoble, A little bit, and I only want to send a camera to take some pictures
[17:33] <fnoble> well... GPS modules can be got for ~£30
[17:33] <Laurenceb> interesting
[17:33] <Laurenceb> I think you need to take a look at calling x^2-x+1 f(x)
[17:33] <fnoble> ok
[17:33] <Cooleo> Hmm, And how much wiring do they take?
[17:33] <Laurenceb> and working out df(x)/dx
[17:34] <fnoble> well, you can use a PIC to control it, which can be got for free as samples :)
[17:34] <fnoble> if you are happy doing a bit of soldering, and some C programming
[17:35] <Cooleo> I cant program :P.
[17:35] <Cooleo> Well, not C
[17:36] <fnoble> good excuse to learn then :)
[17:37] <Cooleo> Is it difficault?
[17:37] <Laurenceb> not too bad
[17:37] <fnoble> its not too bad, looks hard to begin with, but gets rapidly easier with practice
[17:38] <Laurenceb> I use AVR, but theres a big debate with PIC v AVR :P
[17:38] <fnoble> well, i like avr too, but i dont know a source of free avrs
[17:38] <Laurenceb> yes
[17:38] <Laurenceb> I've just sepend £60 on components
[17:39] <Laurenceb> it all adds up
[17:39] <fnoble> anyway, there are other options that might be easier but are more expensive
[17:40] <fnoble> like using some kind of pre-made controller board, i dont really know whats available but people have used gumstix with a lot of success
[17:40] <fnoble> but maybe could use an arduino type thign
[17:42] <Laurenceb> I used an AVR board when I first got into it
[17:46] <fnoble> yeah might be a good way to start, get a development board for an AVR or an arduino
[17:47] <fnoble> then you can use it to learn to program with too
[17:48] <Laurenceb> active-robots.co.uk
[17:48] <Laurenceb> is where I went
[17:48] <fnoble> and not worry about if its not working because you wired it wrong or because of the programming
[17:48] <fnoble> also sparkfun.com can supply just about anything you might need
[17:49] <fnoble> sparkfun have GPS modules, various sensors, developemnt boards, lots of cool stuff
[17:53] <Cooleo> Sorry, I was having Tea.
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[17:55] <Cooleo> You know you said you could get PIC chips as Free Samples, I guess thats without the programmer.
[17:56] <akawaka> microchips pickit2 programmer is pretty cheap
[17:56] <fnoble> yeah
[17:56] <akawaka> $40 or so
[17:57] <akawaka> and you'll get a bunch of samples then
[17:58] <Cooleo> So its not the cheapest business in the world. I might wait until september when I have £30 a week coming in, £120 a month would be enough to start somthing
[17:59] <fnoble> yeah, it can get expensive
[18:00] <fnoble> we just dropped about £250 on parts for 2 new flight computers for our project
[18:00] <Cooleo> Nice. I guess its worth it in the end.
[18:00] <fnoble> yeah, and we have sponsorship
[18:00] <Cooleo> Its cheaper than model rocketry, To get a rocket up to about 100KM its about £50k
[18:00] <Cooleo> Thats cool.
[18:01] <fnoble> so its not out of our pocket :)
[18:01] <Cooleo> Hehe, Even better.
[18:04] <fnoble> take a look at http://wiki.ukhas.org.uk/
[18:04] <fnoble> has some info on various payloads that people here have put together
[18:04] <fnoble> shows some of the variety of approaches
[18:07] <Cooleo> Thanks
[18:10] <Cooleo> Hmm, What about some type of Bluetooth GPS reciever, Which would then connect to somthing and beam it back down?
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[18:11] <Cooleo> Or would the weight just be too much?
[18:14] <fnoble> imo, the bluetooth just adds complexity
[18:15] <fnoble> the gps modules are easy enough to wire up
[18:15] <Cooleo> Its just cheaper, but fair enough
[18:23] <Laurenceb> right done :P
[18:23] <Laurenceb> ground control is now a removable module
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[18:23] <Laurenceb> you can add or remove it to the parafoil or any other project :D
[18:24] <Laurenceb> *from
[18:29] <Laurenceb> arg billions of emails
[18:29] <Laurenceb> ukhas logo indeed :P
[18:32] <Laurenceb> I like your logo jcoxon
[18:32] <Laurenceb> looks very modern :D, perhaps change the font used for the lower letters
[18:32] <Laurenceb> the top font "united kingdom" is good
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[18:38] <fnoble> where is this logo?
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[18:39] <Laurenceb> http://www.flickr.com/photos/jcoxon77/2423695232/
[18:40] <fnoble> nice
[18:49] <fnoble> jcoxon: you went to tibet and nepal?
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[18:58] <Laurenceb> last summer IIRC :P
[18:58] <fnoble> last summer i did the same thing
[18:59] <fnoble> well.. went overland from beijing to india
[18:59] <Laurenceb> oh cool
[18:59] <Laurenceb> jcoxons photos look exciting
[19:01] <Laurenceb> I'm looking for an RC parafoil, any ideas?
[19:04] <jcoxon> hello
[19:04] <fnoble> hi
[19:06] <Laurenceb> I found this http://www.rcgifts.co.uk/index.php?main_page=product_info&cPath=7&products_id=4&zenid=8c4bc6a79b6d65a2dcf2bef392f8c704
[19:06] <jcoxon> indeed i did to tibet to nepal
[19:06] <jcoxon> i actually started in london
[19:06] <jcoxon> :-p
[19:06] <jcoxon> london to nepal
[19:07] <Laurenceb> ^ do you guys think it looks dodgy, you have to sign up to see the prices
[19:07] <fnoble> awesome, looking at your photos of pokhara
[19:07] <fnoble> brings back memories
[19:07] <jcoxon> :-)
[19:07] <jcoxon> i was so tired once we reached pokhara
[19:07] <jcoxon> and the monsoon was kicking in
[19:07] <fnoble> when was that?
[19:08] <jcoxon> we left london end of july
[19:08] <jcoxon> and got to nepal last week of august
[19:08] <fnoble> i was there in late august
[19:08] <jcoxon> last summmer?
[19:08] <fnoble> yeah
[19:08] <jcoxon> wow
[19:09] <jcoxon> did you train it to lhasa
[19:09] <jcoxon> ?
[19:09] <jcoxon> then how did you get down to nepal? car + driver?
[19:09] <fnoble> no, flew, the train was booked up for 2 weeks
[19:09] <fnoble> hitched down to nepal
[19:09] <jcoxon> fnoble, good work hitching
[19:09] <jcoxon> we didn't want to risk it
[19:09] <jcoxon> having a driver was nice
[19:10] <Laurenceb> what are the chances of this :P
[19:10] <jcoxon> we did seats up to lhasa on the train
[19:10] <fnoble> there were some hairy moments, but i got picked up by a jeep about half way
[19:10] <Laurenceb> was that the new railway to lhasa?
[19:10] <jcoxon> Laurenceb, yeah
[19:10] <Laurenceb> interesting
[19:10] <jcoxon> highest railway in teh world
[19:10] <jcoxon> up to 5300m
[19:11] <jcoxon> if only we had known, we had a spare seat in our jeep :-p
[19:13] <Laurenceb> say I've found out how to get a parafoil, search for "r c parachute" on ebay :P theres quite a few mini rc thingys for £20 or so
[19:13] <fnoble> god damn tibetan red tape though
[19:13] <jcoxon> fnoble, we didn't havev too much trouble
[19:13] <fnoble> its ok if you do it by the book, and get a car
[19:13] <jcoxon> hehe yeah
[19:13] <fnoble> trying to use public transport is a nightmare
[19:14] <jcoxon> for us china was probably the easiest
[19:14] <Laurenceb> that train looked ok on the photos
[19:14] <jcoxon> belarus was a night mare
[19:14] <fnoble> yeah i enjoyed being in china
[19:14] <jcoxon> russia was okay
[19:14] <jcoxon> Laurenceb, the train is nice
[19:14] <jcoxon> just after 2 days it isn't
[19:14] <jcoxon> if we were in the sleepers it would have been a breeze
[19:14] <fnoble> i ended up getting a hard seat between xian and chengdu
[19:14] <jcoxon> pah
[19:14] <jcoxon> :-p
[19:15] <fnoble> that was uncomfortable
[19:15] <fnoble> not worth the difference in price anyway
[19:15] <jcoxon> in all we were on trains for 18 days
[19:15] <jcoxon> we thought that
[19:15] <jcoxon> the pain you were in afterwards
[19:17] <jcoxon> got to think of my next trip
[19:18] <fnoble> mmm, yeah ive been thinking of what to do this summer
[19:18] <fnoble> travelling is like crack
[19:18] <jcoxon> but i only get 3-4 weeks :-(
[19:18] <Laurenceb> http://www.youtube.com/watch?v=FFSOEZZ_u2E <-- not bad for £20 :P
[19:18] <jcoxon> thats going to hurt compared to cam
[19:19] <jcoxon> over easter i crossed europe from istanbul to london
[19:19] <fnoble> ok, i was in kathmandu on the 20th then left for pokhara on the 25th i think
[19:19] <jcoxon> which was really good
[19:19] <fnoble> of august
[19:19] <fnoble> ooh, that sounds good
[19:19] <jcoxon> fnoble, yeah we must have been there about the same time
[19:20] <jcoxon> we got to kathmandu around the 20th
[19:20] <jcoxon> actually maybe a little later let me check
[19:21] <jcoxon> nah we got to kathmandu on the 25th
[19:21] <jcoxon> flew home on the 3rd
[19:21] <jcoxon> sept
[19:21] <jcoxon> fnoble, did you ever here of the balloon expedition i started planning to north africa?
[19:21] <jcoxon> hear*
[19:21] <fnoble> nope?
[19:22] <fnoble> also what are all those photos of ZP ballons on your flikr?
[19:22] <jcoxon> it was hush hush
[19:22] <jcoxon> ZPs :-)
[19:22] <jcoxon> that was a couple of summers ago
[19:22] <jcoxon> i worked with cam's atmos chem department
[19:22] <jcoxon> we were in Niger launching ZPs
[19:23] <jcoxon> with CNES
[19:24] <fnoble> awesome
[19:24] <fnoble> how'd you get involved with that?
[19:24] <jcoxon> ummm, Prof Pyle is a Catz Fellow
[19:25] <jcoxon> so heard about Peg I
[19:25] <jcoxon> and invited me along
[19:25] <jcoxon> got some contacts :-)
[19:25] <jcoxon> yet to use
[19:25] <jcoxon> hehe
[19:26] <fnoble> cool, must have been good experience
[19:26] <jcoxon> yeah it was fun
[19:26] <jcoxon> only stayed for 2 weeks
[19:26] <jcoxon> shame
[19:26] <fnoble> where did the balloons come from?
[19:26] <fnoble> made by CNES?
[19:26] <jcoxon> oh this was a CNES operation
[19:26] <jcoxon> yeah
[19:26] <jcoxon> should have stayed longer
[19:26] <jcoxon> we launched a hell of alot of balloons
[19:26] <jcoxon> had 2 lorries of helium
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[19:51] <Cooleo> You guys know where I can get a USB/Serial Accelrometer? OR an accelrometer which stores Data and then can be connected to USB/Serial?
[19:51] <jcoxon> Cooleo, sparkfun have a serial accelerometer
[19:51] <Cooleo> Hmm
[19:52] <Cooleo> Does it have to be connected to serial 100% of the time?
[19:52] <jcoxon> probably
[19:52] <Cooleo> Hmm
[19:52] <jcoxon> you could easily make a logging accelerometer i reckon
[19:52] <Cooleo> Freaking expensive on there :)
[19:52] <fnoble> sparkfun also has a board which takes serial and logs it to an sd card
[19:53] <Cooleo> Hmm
[19:53] <Cooleo> So just connect the two?
[19:53] <Laurenceb> youd probably be better making it yourself
[19:54] <Laurenceb> if you try to use readymade boards for everything it gets expensive
[19:54] <fnoble> yeah, and learning to use microcontrollers is a good skill
[19:54] <Cooleo> Im pretty rubbish at electronics, I would love to be able to make my own.
[19:54] <fnoble> its not too hard if yo start with a dev board
[19:54] <Laurenceb> basically cost = 1/ effort
[19:55] <Cooleo> http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&Item=120247885446&Category=4663&_trksid=p3907.m29
[19:55] <Cooleo> Could that be wired easily?
[19:55] <Laurenceb> with the added problem that what you want might not be buildable with off the shelf stuff
[19:56] <Cooleo> Yeah
[19:56] <Cooleo> Im just doing some jumping soon, and want an Accelrometer to record my fall.
[19:56] <fnoble> cooleo: those parts are REALLY hard to solder
[19:56] <Cooleo> Oh right ok
[19:56] <fnoble> best to get them already on a little board from sparkfun
[19:56] <Cooleo> http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&Item=350049061329&Category=36323&_trksid=p3907.m29
[19:56] <Cooleo> Like that?
[19:57] <fnoble> yeah
[19:57] <fnoble> an accelerometer isnt essential though
[19:57] <Cooleo> Really?
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[19:57] <fnoble> no, bare bones is just a gps and a radio transmitter
[19:58] <Cooleo> This is for another project btw :)
[19:58] <fnoble> with something inbetween to control it
[19:58] <Cooleo> But, I could use it for the same thing
[19:58] <fnoble> like an AVR
[19:58] <Cooleo> Hmm
[19:58] <Cooleo> AVR?
[19:58] <fnoble> or PIC, or something
[19:59] <Laurence1> stupid xp
[19:59] <Laurence1> wireless drops out and the whole system is unusable for 5 minutes
[19:59] <Cooleo> How about: http://cgi.ebay.co.uk/Trimble-Lassen-SK-II-GPS-interface-module_W0QQitemZ130214947268QQcmdZViewItem
[19:59] <Laurence1> wow accels are getting cheaper
[19:59] <Cooleo> Thats a GPS module right? :)
[19:59] <jcoxon> ooo that lassen is back on ebay
[20:00] <jcoxon> i bid for that last week and lost
[20:00] <Laurence1> same cant be said for gyros to such an extent :/
[20:00] Action: jcoxon bagged himself a ttl voltage level ublox gps module for ?22 haha
[20:00] <Laurence1> hrmf
[20:00] <Laurence1> I want a lassen iq
[20:01] <fnoble> Cooleo, that wold work
[20:01] <Laurence1> Cooleo: its a bit old school
[20:01] <Laurence1> you can get smaller lower power ones
[20:01] <fnoble> but there are much smaller modules available
[20:02] <Laurence1> 10 years ago that would have been state of the art :P
[20:02] <fnoble> i'd get a dev board first though, play with it and then start looking for GPS etc
[20:02] <Cooleo> Dev PCB or what?:)
[20:02] <jcoxon> in regards to cheap dev boards check out arduinos
[20:03] <Cooleo> Ive never done anything past soldering one wire to another one :)
[20:03] <Laurence1> jcoxon: good advice
[20:03] <jcoxon> as in theory they can be made to just be AVRs later on
[20:03] <Cooleo> Where is Arduinos?:)
[20:03] <Laurence1> google it
[20:04] <jcoxon> voila
[20:04] <Cooleo> Thanks :)
[20:04] <Laurence1> jcoxon: did you post that stuff off?
[20:04] <jcoxon> hehe
[20:04] <jcoxon> i was waiting for you to ask
[20:04] <jcoxon> guess...
[20:04] <Laurence1> :P
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[20:04] <jcoxon> sorry not yet
[20:04] <Laurence1> can you send it to my oxford address pls ?
[20:05] <Laurence1> as I'm going back down tomorrow
[20:05] <jcoxon> Laurence1, yup, i've been swamped with exams and coursework
[20:05] <jcoxon> which i'm still avoiding
[20:05] <Laurence1> lol I know the feeling
[20:05] <jcoxon> but post offices require leaving the house
[20:06] <Cooleo> http://www.coolcomponents.co.uk/catalog/product_info.php?products_id=115
[20:06] <Cooleo> Is that the right thing?:)
[20:07] <jcoxon> yup
[20:07] <jcoxon> you could attach a accelerometer directly to that
[20:07] <Cooleo> And what do I once ive got that?
[20:07] <jcoxon> play around with it :-)
[20:07] <jcoxon> make a few led blink
[20:07] <Cooleo> Hehe Cool :)
[20:08] <jcoxon> then you could attach an accelerometer to it
[20:08] <Cooleo> Sweet.
[20:08] <jcoxon> and log to storage (which is a bit harder but should be doable
[20:08] <jcoxon> )
[20:08] <Cooleo> Does it require anything else plus that board? Such as batterys etc
[20:08] <jcoxon> usually it runs of usb power
[20:09] <jcoxon> but you can run it off batteries
[20:09] <jcoxon> e.g. runs of a 9v for quite a bit
[20:09] <jcoxon> there is lots of documentation
[20:09] <jcoxon> its best to have a play with it before adding the accelerometer
[20:09] <jcoxon> to get to know it
[20:09] <Cooleo> Cool ok :)
[20:10] <Cooleo> Its gonna have to wait till next week then, Tad short on the money side. Had to pay phone bill and forgot.
[20:10] <Cooleo> Unless anyones selling one inc delivery for £19.50?:P
[20:10] <jcoxon> fair enough
[20:10] <Cooleo> :)
[20:11] <jcoxon> sadly i'm using mine :-)
[20:11] <Cooleo> Np.
[20:11] <Cooleo> Ill sell somthing on ebay and earn the extra £4
[20:12] <jcoxon> fnoble, you around next weekend for the launch?
[20:12] <fnoble> im in cambridge
[20:12] <fnoble> where are you launching from?
[20:12] <jcoxon> okay cool
[20:12] <jcoxon> EARs
[20:12] <jcoxon> if the weather is good enough
[20:12] <fnoble> ok cool, is it a firefly style payload?
[20:12] <jcoxon> not taking a risk
[20:12] <jcoxon> yup
[20:13] <fnoble> cool, got it all working yet?
[20:13] <jcoxon> firefly but not the gps module instead i've got an external gps
[20:13] <fnoble> :)
[20:13] <jcoxon> ummm yes
[20:13] <fnoble> ok, which gps are you using?
[20:13] <jcoxon> code works
[20:13] <jcoxon> ublox
[20:13] <jcoxon> found it on ebay
[20:13] <fnoble> cool
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[20:13] <jcoxon> i'm still waiting for it to be deliever
[20:13] <jcoxon> i've used another module to check the code
[20:14] <jcoxon> the gsm this time will work :-)
[20:14] <fnoble> we have a variety of GPS modules lying around if it doesnt come
[20:14] <fnoble> what are you doing for a case?
[20:14] <jcoxon> well i've got a SIRF II linked up right now
[20:14] <jcoxon> fnoble, hmmm haven't done that
[20:14] <jcoxon> was going for a traditional balsa wood style
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[20:15] <jcoxon> its actually smaller then before, i'm not using molex connectors
[20:15] <jcoxon> so that takes away abit of height
[20:15] <fnoble> could demo the gu box form factor
[20:15] <jcoxon> but i'm still waiting to see how to see the gps module
[20:15] <jcoxon> fnoble, thats a point
[20:15] <jcoxon> hmmmm where can i get one from?
[20:16] <fnoble> any supermarket, it comes with a free pudding inside too :)
[20:16] <jcoxon> nah they are rare
[20:16] <fnoble> ive seen them in sainsburys im sure
[20:16] <jcoxon> my big tescos doesn't sell them, and the waitrose in canary wharf doesn't do them
[20:16] <jcoxon> i'll find a sainsburys
[20:16] <jcoxon> the problem about being in london is that everything is metro style
[20:17] <fnoble> did you ever find out what went wrong with firefly 2?
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[20:17] <jcoxon> not really
[20:18] <jcoxon> the logs don't break
[20:18] <jcoxon> so it didn't lose power failure
[20:18] <jcoxon> the cutdown fired very early
[20:18] <jcoxon> fnoble, oh to push the gps to see if its capped we aren't doing cutdowns :-p
[20:18] <jcoxon> just need good weather
[20:19] <fnoble> yeah, cutdowns are for wimps :)
[20:19] <jcoxon> exactly
[20:19] <jcoxon> and they never work
[20:19] <jcoxon> and hurt your ears when they go off near them
[20:19] Action: jcoxon was deafened for a whole flight :-)
[20:20] <fnoble> are you going with the same radio design?
[20:20] <jcoxon> i've got 2 radios
[20:21] <jcoxon> the circuit design is now a pure beacon on .075
[20:21] <jcoxon> and i've got a radiometrix which is just a transmitter for the 'morse'
[20:21] <jcoxon> on .650
[20:21] <jcoxon> actually its not morse, its just pulsing out the digits
[20:21] <jcoxon> going to be one of those listening jobbys
[20:22] <fnoble> sounds good
[20:22] <jcoxon> as we never get the software decoding anyway
[20:22] <fnoble> well RTTY worked ok in the past
[20:22] <jcoxon> actually need to slow it down a bit, its a bit to fast
[20:22] <jcoxon> fnoble, yeah but they requries effort hehe
[20:22] <jcoxon> actually thats why i got the radiometrix
[20:22] <jcoxon> so that i can upgrade later
[20:23] <fnoble> are all connections soldered now then?
[20:25] <jcoxon> yup
[20:25] <jcoxon> hehe
[20:25] <jcoxon> i have 2 breakout boards, a dev board and a flight board
[20:25] <jcoxon> one connectors, one soldered
[20:26] <fnoble> cool
[20:26] <fnoble> maybe make it possible for the switch to be locked on
[20:27] <jcoxon> its quite stiff
[20:27] <jcoxon> but perhaps tape over the other side to stop it moving back
[20:27] <fnoble> ok, well i guess if the logs are full then power loss wasnt the problem so its not an issue
[20:27] <fnoble> maybe the radio just got a bit cold
[20:28] <fnoble> have we tested the circuit design modles before?
[20:28] <jcoxon> no
[20:28] <jcoxon> tis a first
[20:28] <jcoxon> i'm thinking of doing the same set up though, with the camera in a seperate payload
[20:28] <jcoxon> and was going to add the beacon to that
[20:28] <fnoble> ok, so having a radiometrix on board too will be good
[20:29] <fnoble> ok
[20:29] <jcoxon> keep it out the way of the radiometrix
[20:29] <fnoble> yeah
[20:29] <jcoxon> the radiometrix is nicely attached to the board
[20:29] <jcoxon> sits just next to the gm862 module
[20:29] <fnoble> ok
[20:30] <fnoble> brb
[20:30] <jcoxon> np
[20:30] <jcoxon> i'm off for a bit
[20:36] <Cooleo> Ok. Thats eBay stuff listed, Should hopefully be able to get my board quicker now!
[20:38] <fnoble> Cooleo: you could ask jcoxon if you could come to his launch next week
[20:38] <fnoble> see what its all about
[20:39] <fnoble> its in cambridge, and they may need to keep numbers down so you will need to ask
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[20:41] <Cooleo> Hmm, I dont know. Ive got exams next week, and lots of stuff happening.
[20:42] <Cooleo> Plus, I dont think ill have the cash to get there :)
[20:42] <Cooleo> Thanks anyway :)
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[21:18] <fnoble> !seen edmoore
[21:19] <fnoble> damn zeusbot
[21:19] <Cooleo> :P
[21:19] <Cooleo> TinkerUK has a cheap Board by about £3
[21:19] <Cooleo> So im happy! :D
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[21:48] <fnoble> which one are you thinking of getting?
[21:50] <Cooleo> Umm, The like £18 one
[21:51] <Cooleo> http://tinker.it/ukstore/product_info.php?cPath=29&products_id=36
[21:52] <Cooleo> Arduino Diecimila
[21:56] <fnoble> looks good
[21:58] <jcoxon> stress testing firefly right now
[21:59] <Cooleo> Cool.
[21:59] <Cooleo> Hope it goes ok
[22:05] <Laurence1> cutdowns are vital :P
[22:06] <jcoxon> Laurence1, do you really think so?
[22:06] <Laurence1> yes
[22:07] <jcoxon> i think careful planning with according to the weather is more important
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[22:09] <jcoxon> bbl
[22:09] <Laurenceb> they've always worked for me, used them 4 times so far
[22:21] <Laurenceb> I think those rc parafoils on ebay look brilliant, going to buy one :D
[22:21] <Laurenceb> just a matter of jamming the guidance tronics in the bottom
[22:23] <Cooleo> Im off, Laters Dude.
[22:24] <Laurenceb> cya
[22:25] <Laurenceb> I've been thinking about this logo, maybe I should see if oxford could add their name to the letter?
[22:25] <Laurenceb> I might email the head of atmospheric physics and see what he thinks
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