highaltitude.log.20070131

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[01:00] <laurenceb> $PUBX,40,RMC,0,4,0,0*43
[01:00] <laurenceb> I've written a CRC calculator for nmea and thats what it tells me :)
[01:01] <laurenceb> so if anyones got a u-blox, try it out and let me know :)
[01:02] <laurenceb> okay I'll be off then
[01:02] <laurenceb> cya all
[01:02] <laurenceb> oh I've checked with other gps strings and so I'm pretty sure it will be correct
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[02:29] <icez> hi riksta
[02:29] <riksta> sup
[02:30] <icez> playing with gEDA ... http://icez.org:81/pics/elec/halfadd.png
[02:30] <icez> :p
[02:30] <riksta> haha nice!
[02:31] <riksta> rather basic, but nice ;)
[02:31] <icez> well, gotta start somewhere:)
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[17:05] <jcoxon> hi rjmunro
[17:05] <jcoxon> welcome to #highaltitude
[18:39] <rjmunro> Hi.
[18:41] <rjmunro> I'm interested in using ballons to make photos for Open Street Map.
[18:41] <jcoxon> ooo thats interesting
[18:41] <rjmunro> I'm just wondering how feasible an idea it is, that's why I'm hanging out here.
[18:42] <jcoxon> it certainly possible
[18:42] <jcoxon> however you'd lack control of the balloon
[18:43] <rjmunro> I'm thinking lanuch upwind of something interesting and unmapped, then use http://wiki.ukhas.org.uk/ideas:helium_valve to keep it from getting too high.
[18:43] <jcoxon> right,
[18:44] <jcoxon> the helium valve is still to be tested
[18:44] <jcoxon> it wouldn't be difficult though to have an exceedingly slow climbing balloon
[18:46] <rjmunro> What's the legal situation? Like, can I launch a balloon wherever I want (in the UK), or will they not let me deliberately try to fly over a town?
[18:46] <jcoxon> no you can launch anywhere
[18:46] <jcoxon> just need to get permission which isn't difficult
[18:47] <rjmunro> Presumably you can't launch too near an airport...
[18:48] <rjmunro> How much does a ballon + helium cost?
[18:48] <jcoxon> smallest balloon ?10 off ebay
[18:48] <jcoxon> helium is a little more expensive
[18:49] <rjmunro> I.e. what's the per flight cost assuming you recover your payload intact.
[18:49] <jcoxon> about ?50 in total
[18:49] <jcoxon> if you recover
[18:50] <jcoxon> and the payload is weight
[18:50] <jcoxon> payload weight is low *
[18:53] <rjmunro> What's a typical mission duration?
[18:53] <jcoxon> 1 or 2 hours
[18:54] <jcoxon> Peg I launch had a downward camera
[18:54] <jcoxon> it was rubbish only 640x480
[18:55] <jcoxon> but took interesting pictures
[18:55] <jcoxon> http://www.pegasushabproject.org.uk/pegasus1/pictures/down/
[18:58] <rjmunro> The alternative is you can get a 1/2 hour flying lesson for about £60, and there's no risk of "loosing the payload", so a small plane may work out cheaper, assuming you can mount a downwards pointing camera on it somehow
[18:59] <jcoxon> true
[18:59] <jcoxon> you'd also have control of where you go
[18:59] <jcoxon> basically the cost is helium
[19:00] <jcoxon> if you can find a source it would be literally the cost of a new balloon
[19:01] <phatmonkey> hey all
[19:01] <rjmunro> Maybe with the valve, you could bring the balloon down with 80% of the helium still in it, then recover it somehow...
[19:02] <jcoxon> hmmmm not sure that would be possible
[19:04] <phatmonkey> balloon would be all stretched and fragile i suppose
[19:10] <jcoxon> rjmunro, i did get an email once from a guy that was making maps with pictures from a nasa balloon
[19:11] <jcoxon> (which was long duration) - i'll dig out his site
[19:12] <jcoxon> http://sei.tamu.edu/geocam/
[19:13] <jcoxon> http://hasp-geocam.blogspot.com/
[19:17] <jcoxon> bbl
[19:43] <phatmonkey> jcoxon, do you want admin access to the list?
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[22:11] <jcoxon> hey phatmonkey, that might help
[22:12] <jcoxon> also did my email go out on the list this evening?
[22:24] <phatmonkey> yep
[22:24] <phatmonkey> i'm really tired, need to grab some sleep
[22:24] <phatmonkey> talk tomorrow!
[22:24] <jcoxon> night
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[22:26] <laurenceb> Hi everyone
[22:26] <laurenceb> Launch still on?
[22:28] <jcoxon> indeed it is
[22:28] <jcoxon> check the wiki :-)
[22:28] <laurenceb> any idea about the time on Saturday?
[22:28] <jcoxon> will be in the morning
[22:29] <jcoxon> i sent and email out this evening
[22:29] <jcoxon> did you get it?
[22:29] <jcoxon> oh laurenceb are you still having to go outside to get irc?
[22:29] <laurenceb> oh sorry haven't checked
[22:31] <laurenceb> okay, 9am is a bit tricky
[22:31] <jcoxon> yes
[22:31] <laurenceb> there are no trains from oxford to cambridge
[22:31] <laurenceb> will look at busses
[22:31] <jcoxon> there are buses though
[22:32] <jcoxon> you can stay in my set on friday night if you want - though i'm busy in the evening
[22:33] <laurenceb> hmm there is megabus gets in at 10.25 a bit late
[22:33] <laurenceb> thanx james, but I have a tute on friday evening
[22:33] <jcoxon> oh okay
[22:34] <jcoxon> we need to launch relatively early just as it gets dark so early
[22:35] <laurenceb> yes, national express is only as good as megabus
[22:35] <laurenceb> I will have to catch a train into london and use the tube
[22:36] <laurenceb> if I do that I can get to cambridge by 9
[22:37] <jcoxon> excellent
[22:38] <laurenceb> yesd but I have to catch a train at 5 to 6 in the morning :(
[22:38] <laurenceb> oh well I'll just cycle down to the station
[22:38] <laurenceb> it's not too far from college
[22:39] <laurenceb> just hope I don't get stabbed or blown up on the tube!
[22:39] <laurenceb> last time I went on it a guy in the next carrage got stabbed
[22:40] <jcoxon> oh
[22:41] <jcoxon> i'm sure you'll be fine!
[22:41] <laurenceb> Anyway I've been reading up on nmea CRC, and it seems its not proper CRC or checksum
[22:41] <jcoxon> oh right
[22:41] <laurenceb> its the xor of all the bytes between the $ and *
[22:42] <laurenceb> so I wrote some code that seems to work, and it gives:
[22:42] <jcoxon> do you want me to test?
[22:42] <laurenceb> $PUBX,40,RMC,0,4,0,0*43
[22:42] <laurenceb> yes please if its poss
[22:42] <jcoxon> one sec
[22:44] <laurenceb> the gps shouldnt echo stuff, and will not respond if the crc does not match
[22:44] <laurenceb> but you should just be able to send serial in
[22:45] <jcoxon> hmm still seems like 1hz
[22:46] <laurenceb> hmm can you test to see if your serial is going in?
[22:46] <laurenceb> like put a multimeter on the pin and type lads on random stuff
[22:47] <laurenceb> -loads of random
[22:48] <laurenceb> and did you put <CR><LF> on the end i.e. return
[22:49] <jcoxon> it doesn't like that
[22:49] <jcoxon> doesn't complete the echo
[22:49] <jcoxon> my txd seems to be stuck at 3.3v
[22:49] <jcoxon> thats from the gumstix
[22:49] <jcoxon> even if it type loads
[22:50] <laurenceb> okay, maybe the txd wont go through
[22:51] <laurenceb> try $PUBX,40,GGA,0,2,0,0*58
[22:53] <laurenceb> thanks, I'd better be off in time to catch the bar cya
[22:53] <jcoxon> cya
[22:53] <laurenceb> oh that is for 2hz gga
[22:53] <laurenceb> any luck?
[22:54] <laurenceb> oh maybe were on a different uart ie not uart 1 doh
[22:55] <laurenceb> I will try myself when my module arrives from usa
[22:55] <laurenceb> cya must run
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[23:00] <jcoxon> evening rocketboy
[23:01] <rocketboy> hiya
[23:01] <rocketboy> I got the UKHAS email
[23:01] <rocketboy> yeah
[23:02] <jcoxon> well i'm glad the emails work now :-D
[23:03] <rocketboy> I'm OK with henry cutting down - but I may put XABEN1 on the bottom of the train (with its own chute) - as I'd like to try the cutdown out
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[23:04] <jcoxon> hmmm okay
[23:04] <jcoxon> whats the plan about radio freqs?
[23:05] <rocketboy> I'll set it to cutdown early - or if it detects descent
[23:05] <rocketboy> not sure - whats tracker 4 on?
[23:05] <jcoxon> well it can be adapted
[23:05] <jcoxon> give me a sec i'll grab henry
[23:05] <jcoxon> ummm you are at the same freq as mc-
[23:05] <jcoxon> will that be an issue?
[23:05] <rocketboy> in that case suggest its on 434.075 and I'll go on 434.650
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[23:06] <jcoxon> i'll update the wiki about your cutdown
[23:06] <laurenceb> missed the bar :(
[23:06] <rocketboy> mcs is on 434.075 - but it only comes on onece per minute for about 15secs
[23:07] <jcoxon> okay
[23:07] <jcoxon> well henry can probably get his to have short bursts
[23:07] <jcoxon> so they don't clash
[23:09] <jcoxon> weather seems to actually be improving :-)
[23:10] <rocketboy> yep - sat looks real good
[23:11] <jcoxon> at the cambridge meeting today we were thinking about whether the radar reflector will block radio transmission
[23:12] <rocketboy> it depends how close it is - it will bloack some portion of the sky
[23:13] <jcoxon> am i still building a reflector?
[23:13] <rocketboy> -- just put some distance between it and the GPS
[23:13] <rocketboy> you don't need to for churchill
[23:14] <jcoxon> do we want one anyway?
[23:14] <rocketboy> its a good idea IMO
[23:15] <rocketboy> I was thinking of having EARS/sunday as a backup - that will need a RADAR reflector for sure
[23:15] <jcoxon> i'll build one
[23:15] <jcoxon> what did material was the metal bit?
[23:17] <rocketboy> I used space blanket - it like those mylar metailized party baloons
[23:17] <jcoxon> okay i'll get one of those
[23:17] <rocketboy> you can get a huge sheet in a sports shop for about £2.00
[23:18] <jcoxon> i might make the central strut a tube - we can pass the main line through it
[23:18] <rocketboy> or some fancy parcel wrap is similar
[23:18] <jcoxon> therefore it won't be under tension
[23:18] <rocketboy> should be oK
[23:19] <rocketboy> my design needed to be under a bit of tension - but there again my design ripped apart
[23:19] <jcoxon> oh henry has got our last payload back
[23:20] <laurenceb> what state was it in/
[23:20] <rocketboy> great - what state is it in
[23:20] <jcoxon> actually quite intact
[23:20] <rocketboy> did it get wet?
[23:20] <jcoxon> apparently looks like it
[23:21] <laurenceb> probably landed in the sea
[23:21] <laurenceb> does it still work?
[23:21] <jcoxon> not sure
[23:21] <jcoxon> didn't really get round to asking
[23:22] <jcoxon> i'm sure he'll tell all soon
[23:22] <laurenceb> http://www.parallax.com/propeller/index.asp
[23:23] <laurenceb> looks very awsome, unlike basic stamp
[23:23] <laurenceb> cheap as well
[23:25] <laurenceb> not sure about the "spin" language, looks a bit odd, might be hard to resolve problems
[23:28] <rocketboy> what is happening transport wise Saturday - if we are in 2 teams then we will need 2 cars - I'll be in mine
[23:28] <rocketboy> BTW have just bought a TomTom
[23:29] <rocketboy> which will be a help
[23:29] <jcoxon> hmmm i'm trying to work that out right now
[23:29] <jcoxon> i'm actually thinking hte launch team doesn't need a car
[23:29] <jcoxon> i wasn't planning on coming on the recovery
[23:30] <rocketboy> I hope to have finished a antenna for the car - although it may be best for someone to stay put and track - rather than do it from the car?
[23:30] <rocketboy> really need 2 radios
[23:30] <jcoxon> yeah - if we had 2 then the launch team could track from churchill
[23:30] <jcoxon> and the recovery team could go on
[23:30] <jcoxon> do we need 2 cars?
[23:30] <jcoxon> if needed i could bring my car up
[23:31] <rocketboy> I guess not if someone can wait for the recovery team to get back
[23:32] <jcoxon> what i was think was:
[23:32] <jcoxon> arrive, set up, each individual person works on their payload
[23:32] <jcoxon> launch team prepare balloon - don't inflate till payloads are working
[23:32] <jcoxon> launch
[23:32] <jcoxon> do a bit of launch site tracking etc
[23:32] <jcoxon> recovery team leaves
[23:33] <jcoxon> launch team tidy up - go for breakfast etc
[23:33] <laurenceb> hmm food
[23:36] <rocketboy> sounds OK - I was thinking the recovery team would leave immediatly - but given the predicted winds we probably don't need to
[23:37] <jcoxon> no thats a good idea
[23:37] <laurenceb> yes nice low winds
[23:37] <jcoxon> just need a second radio i guess
[23:37] <laurenceb> omg: http://www.dontronics-shop.com/product.php?productid=16535&cat=371&page=1
[23:39] <rocketboy> not a bad proce
[23:39] <rocketboy> price
[23:39] <rocketboy> anyway - i'm off
[23:39] <rocketboy> c u
[23:39] <laurenceb> its oled as well
[23:40] <laurenceb> cu
[23:40] <jcoxon> night
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[23:40] <laurenceb> problem with oled displays, I think
[23:40] <laurenceb> is that they are like a non tft lcd
[23:41] <laurenceb> ie you have to drive them one row at a time
[23:41] <laurenceb> as knowone has worked out how to put transistors on them
[23:41] <laurenceb> so they are limited to small low res screens
[23:43] <laurenceb> jcoxon, any luck with the gps?
[23:43] <laurenceb> I looked up and we do need uart 1
[23:44] <laurenceb> I think another possibility is that its set for ubx inputs
[23:44] <jcoxon> no i've haven't really do any more experimentation
[23:44] <jcoxon> don't want to break it
[23:44] <laurenceb> okay dont dother, i
[23:45] <laurenceb> oh you wont be able to break it with commands
[23:45] <laurenceb> but I'll try with my module, hopefully I'll have more luck
[23:46] <jcoxon> okay
[23:46] <laurenceb> It comes with the u-center software, so that should help
[23:46] <jcoxon> well i'm off to bed
[23:46] <jcoxon> so night
[23:46] <laurenceb> cya then
[23:46] <laurenceb> me too
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[00:00] --- Thu Feb 1 2007