highaltitude.log.20090511

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[01:58] <natrium42> looks like rjharrison got sparkfun'd
[02:07] <Laurenceb> sparkfuned?
[02:10] <natrium42> yeah, they posted his pics
[02:10] <natrium42> or a link rather
[02:11] <Laurenceb> oh
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[07:31] <edmoore> morning all
[07:31] <Laurenceb> hi edmoore
[07:32] <edmoore> yo
[07:32] <edmoore> all well?
[07:32] <Laurenceb> I'm just working on http://wiki.ukhas.org.uk/code:interrupt_driven_ubx
[07:32] <Laurenceb> almost got it running... theres some issue with byte alignment on a couple of the data points
[07:33] <edmoore> you got a 406?
[07:33] <Laurenceb> yep
[07:34] <Laurenceb> running ubx through an avr
[07:34] <Laurenceb> I got my lpc2148 working with jtag too :D
[07:34] <edmoore> ah cool
[07:34] <Laurenceb> been playing with ram dumps
[07:34] <edmoore> what was the fix in the end?
[07:35] <Laurenceb> I had to build everything from source
[07:35] <Laurenceb> usb drivers, openocd, then faff about with loads of config scripts
[07:35] <Laurenceb> nightmare
[07:36] <Laurenceb> anyway the 406 is awsome, <400ms latency I think
[07:36] <Laurenceb> the lpc2148, does it have flash banks?
[07:40] <edmoore> i *think* it's all the same space
[07:40] <edmoore> but check
[07:41] <edmoore> it's all transparent to us in crossworks land
[07:41] <Laurenceb> right
[07:41] <Laurenceb> hmm I casnt work out this alignment issue
[07:41] <Laurenceb> avr is little endian, as is the data
[07:42] <Laurenceb> so if I move through the struct in the order its defined, the data should come out ok?
[07:42] <edmoore> yep
[07:42] <edmoore> actually
[07:43] <Laurenceb> ok... so thats no the problem I must be out of alignment
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[08:49] <Laurenceb> hi
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[10:42] <Laurenceb> hi edmoore
[10:43] <edmoore> morning
[10:43] <Laurenceb> ubx is confusing me
[10:44] <Laurenceb> ((u08*)&gps)[POS_OFFSET-lenght]=c; that addresses individual bytes right?
[10:45] <edmoore> am sort of working this morning, can't help much with coding i'm afraid
[10:45] <Laurenceb> k
[10:45] <Laurenceb> its weird, the state machine is running ok, but the gps data is kind of garbled
[10:46] <Laurenceb> running ucenter in wine says its fine
[10:49] <edmoore> got the debugger working?
[10:49] <Laurenceb> yes
[10:49] Action: Laurenceb dumps ram images
[10:49] <Laurenceb> its very cool
[10:50] <Laurenceb> need to setup the compiler next
[10:50] <Laurenceb> I've been playing with an olimex usb mouse demo that came as a bin on the cd
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[14:26] Action: rjharrison thinks edmore is enjoying having no exams
[14:27] <rjharrison> edmoore: about time to get your rig set up !!!
[14:27] <edmoore> true
[14:27] <edmoore> but i am now working on projects
[14:27] <edmoore> 1) H-infinity methods
[14:27] <edmoore> 2) Image compressor
[14:27] <edmoore> 3) CUSF stuff
[14:28] <edmoore> I have a crap outlook here anyway. I should just go to the shack and point a 40m 4 element yagi at you
[14:28] <edmoore> with 1kW
[14:28] <edmoore> you should hear me :p
[14:28] <rjharrison> WTF do you want to impage process for?
[14:28] <edmoore> it's academic work
[14:28] <edmoore> got to design one
[14:28] <edmoore> and then they'll compete
[14:29] <rjharrison> Oh ok fing the jpeg code
[14:29] <rjharrison> find
[14:29] <edmoore> we can do better than that!
[14:29] <edmoore> that's just haffman coding
[14:29] <edmoore> huffman*
[14:29] <rjharrison> really ok
[14:29] <rjharrison> How do you win?
[14:29] <rjharrison> Lostless
[14:29] <edmoore> each image can be a max of 6kb
[14:30] <rjharrison> and maintain some deatal I assum or you could send them a pixel
[14:30] <rjharrison> detail
[14:30] <edmoore> and whicher has subjectively the best quality for the 6kb wins. if you can't decide which is best, then it's mean squared array across the array between original and compressed
[14:31] Nick change: kingj -> KingJ
[14:32] <edmoore> this H-infinity stuff is in a module called 4F2, which when i mention it makes people sweat a little in the 4th year, and amusingly on the MIT website set up for mit students doing an exchange with cambridge, it lists out all the available modules and lists pros and cons, MIT equivalents, what the notes are like etc
[14:32] <edmoore> but for 4F2 it just says: "DO NOT TAKE 4F2"
[14:33] <edmoore> it's a bit of a mind job so far
[14:34] <Laurenceb> H-infinity for the hobble?
[14:34] <rjharrison> Ok I like the mean sqr idea
[14:34] <edmoore> it could be for hobble. but generally for life
[14:34] <rjharrison> So massive compreasion and no time constraints on recovery
[14:34] <edmoore> no time constraints
[14:46] <Laurenceb> from what I can see its only useful for control
[14:46] <Laurenceb> were you saying before you could use it for state estimation
[14:50] <SpeedEvil> Cool optobiophysics link of the day.
[14:50] <SpeedEvil> http://en.wikipedia.org/wiki/Haidinger's_brush
[14:53] Action: Laurenceb has discovered the joys of fdev_get_udata
[14:56] <Laurenceb> I think there was an iaaue with printf("%ld,%ld,%ld,%hhu,%hhu\n",Gps.latitude,Gps.longitude,Gps.altitude,Gps.status,Gps.nosats);
[14:56] <Laurenceb> or at least printf("%d,%d,%d,%u,%u\n",Gps.latitude,Gps.longitude,Gps.altitude,Gps.status,Gps.nosats);
[14:56] <Laurenceb> can printf mess up and read in too many bytes from armuments passed to it?
[14:57] Action: SpeedEvil wonders if armuments are what arm functions get passed.
[14:57] <SpeedEvil> you mean it was depleting the stack?
[14:58] <Laurenceb> so say for %u it expected 4 bytes
[14:58] <Laurenceb> it grabbed 4 starting from the location of Gps.status
[14:58] <Laurenceb> leading to nonsense being printed
[15:00] <SpeedEvil> I think it may get an int by default
[15:01] <Laurenceb> should I use hhu ?
[15:01] <SpeedEvil> sorry - I'm mostly rambling today.
[15:01] <SpeedEvil> horrible cold.
[15:11] <Laurenceb> but is it possible for printf to screw up like that?
[15:16] <SpeedEvil> Ask me next week.
[15:16] Action: SpeedEvil has a head feeling like it's packed with cotton wool.
[15:16] <SpeedEvil> sorry
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[16:02] <Laurenceb> http://www.digital60.org/media/photos/babypanoramiclarge.jpg?eid=7xziu6ge1opdw5makagu8wcqlg5coen6lcira/yfeog=
[16:02] <Laurenceb> ^ looks like a nice place to hang out :P
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[16:29] <Laurenceb> edmoore: for your hobble, what size scope are you thinking?
[16:32] <edmoore> Laurenceb: a small one
[16:32] <edmoore> probs just camera + lens initially
[16:35] <edmoore> and wide field stuff - bands of the milky way, orion, etc
[16:36] <SpeedEvil> you're still going with the ovimager?
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[16:40] <Laurenceb> servos or built from scratch?
[16:41] <Laurenceb> guess servos will be way too slow an noisy
[16:41] <SpeedEvil> I'm pondering trying to reverse engineer the protocol of the imager in the dimage X1
[16:41] <Laurenceb> noisy = vibration
[16:41] <SpeedEvil> which has image stabilisation, and is OK
[16:41] <Laurenceb> guess if you stick the imu onto the back of the camera, you can just use motors and h bridges
[16:42] <Laurenceb> bypass the whole position feedback stage
[16:43] <SpeedEvil> if noise is low enough
[16:43] <SpeedEvil> and you don't get aliasing or something from gear noise
[16:44] <Laurenceb> wonder if you could use voice coils and a large mirror
[16:45] <Laurenceb> then a prop for the rough yaw
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[16:46] <jcoxon> hey rjharrison
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[16:46] <Laurenceb> especially if you have a floater arrangement
[16:47] <edmoore> Laurenceb: probably coarse and fine control
[16:47] <edmoore> maybe digial servos to provide +/- 0.5 degree in each axis
[16:47] <Laurenceb> servos coarse?
[16:47] <Laurenceb> yeah
[16:47] <edmoore> and a more coarse scratch-built system to swing it about
[16:48] <Laurenceb> ah ok
[16:48] <jcoxon> hey all :)
[16:48] <edmoore> a digital servo will give you a (non linear) 10 bits within that 0.1 degree
[16:48] <Laurenceb> then a prop/fan?
[16:48] <edmoore> why?
[16:48] <Laurenceb> hmm
[16:48] <Laurenceb> for yaw
[16:48] <Laurenceb> coarse yaw
[16:49] <Laurenceb> guess you can filter out smaller movements in postprocessing
[16:49] <edmoore> no, momentum wheel
[16:49] <Laurenceb> fair doos
[16:49] <edmoore> desaturate into the balloon tether
[16:49] <Laurenceb> yeah
[16:49] <edmoore> and yes, lots of work on deconvolution on the ground too
[16:49] <Laurenceb> that should work a treat
[16:49] <Laurenceb> ideally... no steering :P
[16:50] <edmoore> :)
[16:50] <Laurenceb> just loads of exposures with ium data
[16:50] <edmoore> ?
[16:50] <edmoore> ium?
[16:52] <Laurenceb> imu
[16:52] <edmoore> oh yes
[16:52] <edmoore> but probably guide star for the fine stuff
[16:53] <edmoore> want to get maybe 30 arcseconds 2-sigma wobble
[16:53] <edmoore> 2.5 sigma....
[16:53] <edmoore> whatever. I want it to be good
[16:53] <edmoore> ok, need to be off
[16:53] <edmoore> back later
[16:53] <Laurenceb> cya
[16:53] <jcoxon> ooo interesting, Lasa-4 just got 2nd place on altitude
[16:54] <edmoore> what is that?
[16:54] <jcoxon> 122,283ft
[16:54] <jcoxon> high altitude attempt in canada
[16:54] <jcoxon> oh wait its 3rd
[16:54] <jcoxon> 2nd is Lasa-3
[16:55] <jcoxon> http://www.szijarto.ca/
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[16:57] <Laurenceb> be gone you
[16:57] <Laurenceb> jcoxon: you sure ublox5 is altitude unlimited?
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[16:57] <jcoxon> Laurenceb, i've take a ublox 4 to 31km
[16:57] <jcoxon> actually 32km
[17:00] <Laurenceb> shuttle launch soon
[17:00] <jcoxon> indeed
[17:00] <jcoxon> what time BST?
[17:00] <Laurenceb> 6pm
[17:01] <Laurenceb> oops 2 hours - gms/bst
[17:03] <jcoxon> 7pm?
[17:04] <jcoxon> 1901 BST
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[17:16] Action: jcoxon proposes launch day this saturday
[17:17] <jcoxon> actually all weekend
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[17:17] <jcoxon> ping rjharrison
[17:18] <Laurenceb> ok
[17:18] <Laurenceb> I'm up for this
[17:18] <Laurenceb> my rogallo should be ready
[17:18] <Laurenceb> also I can have a UM12 tracker
[17:18] <Laurenceb> ready by the weeked
[17:19] <Laurenceb> UM12 + Ublox + avr
[17:19] <jcoxon> what freq?
[17:19] <Laurenceb> 434.2
[17:19] <jcoxon> okay cool
[17:19] <jcoxon> and the rogallo?
[17:19] <Laurenceb> yes
[17:20] <jcoxon> freq
[17:20] <jcoxon> ?
[17:20] <Laurenceb> 434.0-75
[17:20] <jcoxon> okay
[17:20] <Laurenceb> I'd need to make a board for the tracker
[17:20] <Laurenceb> which is annoying
[17:20] <jcoxon> don't rush things Laurence
[17:20] <jcoxon> first rule of ballooning
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[17:20] <Laurenceb> it'd be a secondary poayload
[17:21] <jcoxon> which would?
[17:21] <jcoxon> the UM12?
[17:21] <Laurenceb> yes
[17:21] <Laurenceb> UM12+avr+ublox
[17:21] Action: Laurenceb contemplates flying vreadboard
[17:22] <jcoxon> hmmmm
[17:22] <Laurenceb> I readdly need 2 uarts
[17:22] <Laurenceb> so atmega324p
[17:23] <Laurenceb> and I dont want to waste one of them
[17:25] <Laurenceb> ooh hang on.. you can use the spi as a uart
[17:25] <Laurenceb> never tried that, but it is possible
[17:25] <Laurenceb> hmm then I could fly an atmega168
[17:25] <Laurenceb> ublox - spi <atmega168> uart - um12
[17:27] <jcoxon> can't do software serial?
[17:27] <Laurenceb> ewwwww
[17:28] <jcoxon> laurence you are trying to get 2 uarts out of a single uart chip!
[17:28] <Laurenceb> hmm apparently ublox 5 has only velocity limit
[17:29] <Laurenceb> there must be some altitude limit, but its not in the flyer
[17:29] <Laurenceb> ublox 4 used the and rule
[17:29] <jcoxon> i think cusf spoke to the m
[17:29] <jcoxon> its 50km
[17:29] <Laurenceb> haha
[17:29] <jcoxon> well i seem to remember something like that
[17:29] <Laurenceb> well as long as we arent jaxa we are fine
[17:30] <Laurenceb> right I'm off
[17:30] <jcoxon> cya
[17:30] <Laurenceb> may try and make maplins and get a crystal
[17:30] <Laurenceb> I think I can have a test board made up be sat
[17:30] <Laurenceb> bya
[17:30] <jcoxon> well EARs has a limit on 3 launches
[17:30] <jcoxon> so we shall see
[17:30] <Laurenceb> hehe
[17:31] <Laurenceb> this could fly with rjharrison
[17:31] <Laurenceb> cya
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[17:40] <jcoxon> any one on a mac that is free for 5 mins to test something for me?
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[17:40] <sbasuita> jcoxon, try AlexBreton
[17:40] <AlexBreton> on a mac?
[17:40] <AlexBreton> yeah I have one?
[17:40] <AlexBreton> ^no question amrk
[17:40] <sbasuita> AlexBreton, and i doubt you are busy with revision ;)
[17:41] <AlexBreton> english
[17:42] <jcoxon> AlexBreton, to pm work for you?
[17:42] <jcoxon> do*
[17:42] <AlexBreton> sure
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[18:31] <Jon_APEX> evening all
[18:31] <sbasuita> evening
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[18:34] <jcoxon> hey Jon_APEX
[18:34] <Jon_APEX> do you chaps normally stick mobile phones on balloon payloads?
[18:34] <jcoxon> Jon_APEX, i was wondering if you didn't mind me slightly reorganising your wiki pages, so that they come under a single UK payload
[18:34] <jcoxon> Jon_APEX, yes
[18:34] <Jon_APEX> by all means, go for it :)
[18:34] <Jon_APEX> what phones are popular?
[18:35] <jcoxon> ummmm ones that accept AT commands
[18:35] <sbasuita> Jon_APEX, you basically want one that supports 'AT Commands'
[18:35] <sbasuita> Jon_APEX, preferably that you can send text messages in text mode, rather than PDU mode
[18:35] <Jon_APEX> got a K750i sitting around here, been talking to it with minicom
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[18:35] <Jon_APEX> but it seems to be an emulated UART rather than a real one?
[18:36] <sbasuita> Jon_APEX, yes
[18:36] <sbasuita> Jon_APEX, we are using a w800i
[18:36] <sbasuita> which is the same as the k750i
[18:36] <sbasuita> apart from aesthetically
[18:36] <Jon_APEX> right OK
[18:36] <Jon_APEX> what microcontroller are you using?
[18:36] <sbasuita> Jon_APEX, you are using USB?
[18:36] <Jon_APEX> at the moment, just using the standard USB-phone cable
[18:36] <Jon_APEX> DCU-60 or something?
[18:36] <sbasuita> Jon_APEX, yes
[18:37] <jcoxon> the question is really where the usb-serial conversion takes place
[18:37] <sbasuita> Jon_APEX, we were hoping that the 12pin on the bottom actually exposes a real serial
[18:37] <sbasuita> Jon_APEX, but haven't had a chance to experiment yet
[18:37] <sbasuita> few clues
[18:37] <Jon_APEX> from my experiments this evening, it would appear not
[18:37] <Jon_APEX> linux kernel gives me a serial device on /dev, which minicom can talk to
[18:37] <sbasuita> Jon_APEX, ah, what did you do?
[18:37] <sbasuita> yes
[18:37] <Jon_APEX> "AT+CSMS?" gives an OK response
[18:38] <Jon_APEX> however, sending the serial "AT+CSMS?" straight to the rx/tx on the phone provokes no reponse whatsoever
[18:38] <sbasuita> what pinout did you use?
[18:39] <jcoxon> from the pinout i would say that its not going to expose raw seial
[18:39] <Jon_APEX> 9= ground, 10 = rx, 11 = tx
[18:39] <Jon_APEX> jcoxon: it seems that way
[18:39] <sbasuita> and 12 = +V?
[18:39] <sbasuita> damn
[18:39] <Jon_APEX> that only appears to be required for charging the phone
[18:39] <Jon_APEX> serial comms using minicom only require tx/rx/ground
[18:40] <sbasuita> god knows what this guy was up to: http://www.tododream.com/foro/showthread.php?t=12657
[18:40] <sbasuita> (that is a DCU-60)
[18:40] AlexBreton (n=Alexande@client-86-25-181-221.bkl-bng-012.adsl.virginmedia.net) left irc:
[18:41] <Jon_APEX> Interesting
[18:41] <Jon_APEX> I wonder if that module does the USB/ttl conversion
[18:41] <sbasuita> mmm
[18:42] <Jon_APEX> I shall try sticking this setup on a 'scope at some point
[18:42] <Jon_APEX> I'm guessing the serial data is packetised and sent over USB
[18:42] <Jon_APEX> So from the computer's perspective, it's talking serial
[18:43] <Jon_APEX> Anyone know of any phones that have real serial UARTs?
[18:44] <sbasuita> Looks like ALIEN will need a new phone as well :(
[18:45] <jcoxon> check out gnokii - they have lots of info about phones and serial cables etc
[18:45] <Jon_APEX> jcoxon: Thanks :)
[18:46] <Jon_APEX> sbasuita: Yes, the SE AT solution looked good for our next one too
[18:46] <Jon_APEX> :(
[18:46] <jcoxon> right nasatv time
[18:46] <Jon_APEX> Oh yes, thanks for reminding me
[18:47] <sbasuita> ooh
[18:47] Action: sbasuita tunes in
[18:47] <jcoxon> also there might be some launches this weekend from cambridge
[18:47] <jcoxon> good weather for it
[18:47] <Jon_APEX> Cool, will be around all weekend to watch :)
[18:48] <jcoxon> if you can find a 70cm radio would be good to have a DL station
[18:48] <jcoxon> :-)
[18:49] <Jon_APEX> What antennas are usually used for the DL?
[18:49] <jcoxon> anything from a whip, to moxon to a yagi
[18:50] <Jon_APEX> OK
[18:50] <Jon_APEX> The only thing we have to hand is a VHF/UHF handheld
[18:50] <jcoxon> yagi is best
[18:50] <Jon_APEX> the antenna is the problem at the moment
[18:51] <jcoxon> well if you need a quick fix an moxon can be made out of a coathanger
[18:51] <jcoxon> not promising you'll hear anything - handhelds are that sensitive
[18:51] <Jon_APEX> True
[18:51] <Jon_APEX> might give it a shot :) rather busy at the moment though
[18:51] <jcoxon> fair enough
[18:51] <Jon_APEX> Exams etc. Will have more free time in around a month
[18:51] Action: jcoxon might kick hte Alien team to listen in with his radio
[18:52] <Jon_APEX> Will try and set up a DL station in a few weeks
[18:52] <jcoxon> hopefully we'll have a new version of the client - will make everyone's life much easier
[18:52] <sbasuita> jcoxon, sure, I can listen in with my midget whip
[18:52] <sbasuita> ; )
[18:53] <jcoxon> sbasuita, you'll need to get high up with that puny whip
[18:53] <sbasuita> Say what?
[18:54] <sbasuita> NASA counted down to 0, and then started again from 9...
[18:54] Action: sbasuita grumbles
[18:54] <natrium42> it's a hold
[18:54] <jcoxon> hehe that was the countdown of the hold
[18:54] <natrium42> :P
[18:54] <jcoxon> hey natrium42 got the boards today
[18:54] <natrium42> btw, ustream seems to give the best quality nasatv
[18:54] <natrium42> http://www.ustream.tv/channel/spacevidcast
[18:54] <natrium42> jcoxon, cool
[18:54] <natrium42> jcoxon, rjharisson got sparkfun'd
[18:55] <jcoxon> yeah i saw
[18:55] <natrium42> :)
[18:56] <jcoxon> hmmm ustream is slow for me
[18:56] <jcoxon> nasa.gov is better
[18:56] <jcoxon> though slightly behind
[18:56] <natrium42> yeah :S
[18:56] <natrium42> but usteram is HD if you go full screen
[18:57] <natrium42> but poor frame rate :S
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[18:59] <jcoxon> rjharrison, http://www.nasa.gov/multimedia/nasatv/index.html
[18:59] <jcoxon> hurry
[19:00] <jcoxon> :-)
[19:03] <rjharrison> there
[19:05] <rjharrison> just got the launch
[19:05] <jcoxon> :)
[19:05] <jcoxon> i want a space shuttle
[19:05] <Jon_APEX> Haha
[19:05] <Jon_APEX> That was pretty cool
[19:06] <stilldavid> 310,000 feet in 4 minutes. whoah.
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[19:10] <sbasuita> Look at that globe rotate
[19:10] <sbasuita> unbelievably cool
[19:10] <sbasuita> When do they jettison the fuel tank?
[19:11] <sbasuita> Aww no camera :(
[19:11] <sbasuita> Is that it then?
[19:16] <stilldavid> there's an FT-817 on ebay for $510 right now, w/accessories
[19:16] <stilldavid> I'm quite tempted :(
[19:16] <stilldavid> (USD)
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[19:22] <natrium42> edmoore!!!111!ln(e)
[19:23] <edmoore> yes
[19:24] <natrium42> hi :)
[19:28] <jcoxon> stilldavid, ft-817 are great radios
[19:28] <rjharrison> Great launch
[19:29] <rjharrison> stilldavid: I love my ft-817 it's perfect for HABing
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[19:31] <Laurenceb> hi
[19:31] <Laurenceb> jcoxon: so I have a plan worked out
[19:32] <jcoxon> okay...
[19:32] <Laurenceb> I can build a ~200gram payload about 20cm *8 *8 that can dangle of the bottom of something else
[19:32] <jcoxon> uhuh
[19:32] <Laurenceb> 3xlithium AA, avr, um12, ublox
[19:33] <Laurenceb> 10 second loop, sends pos, sends receive buffer, waits for any data being redeived, repeat
[19:33] <Laurenceb> how many people can we muster for a launch?
[19:34] <jcoxon> that depends
[19:34] <jcoxon> Laurenceb, and the rogallo?
[19:34] <Laurenceb> yes
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[19:34] <jcoxon> 2 payloads - brave...
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[19:35] <Laurenceb> hopefully not at the same time
[19:36] <edmoore> i can't prmise churchill for this weekend
[19:36] <jcoxon> Laurenceb, if i was checky and suggested only one flight what would you fly?
[19:36] <edmoore> i might be away
[19:37] <jcoxon> edmoore, okay, i've spoken to steve this evening
[19:37] <Laurenceb> the um12 prob
[19:37] <jcoxon> Laurenceb, the reason is i'm concerned to have to many payloads with .075
[19:37] <Laurenceb> right
[19:37] <Laurenceb> um12 is not on .075
[19:37] <jcoxon> what i'm going to suggest is:
[19:37] <Laurenceb> or the other frequ
[19:38] <jcoxon> you fly with rjharrison
[19:38] <Laurenceb> ok sounds good
[19:38] <jcoxon> as he is .075 and um12 is something else
[19:38] <Laurenceb> ~.2
[19:38] <jcoxon> if rjharrison is happy with that
[19:38] <jcoxon> and then i fly seperately
[19:38] <Laurenceb> k
[19:38] <Laurenceb> yeah I'll leave the rogallo
[19:39] <jcoxon> let me work this out a bit more...
[19:39] <Laurenceb> it needs a bit more testing, and I wont have time if I build the um12 payload
[19:43] <jcoxon> Laurenceb, what power is a um12?
[19:43] <jcoxon> 10mW?
[19:43] <Laurenceb> yes
[19:45] <natrium42> jcoxon, http://spacenear.us/wiki/lib/exe/fetch.php?media=flightcomputer:atlantic-halo-flight-computer-rev1.pdf
[19:46] <jcoxon> natrium42, thanks
[19:46] <natrium42> np
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[20:24] <Jon_APEX> question for you all - linear or switch mode regulator on the payload?
[20:25] <rjharrison> edmoore will tell you switch for efficiency I think
[20:25] <Jon_APEX> we used switch on Apex I
[20:25] <edmoore> i don't recall he's ever advocated it
[20:26] <edmoore> he himself uses linear on badger
[20:26] <Jon_APEX> just concerned about EMI/RFI and the lassen's tolerance to ripple
[20:26] <rjharrison> But linear is cheap probably depends on the voltage jump you want to do
[20:26] <Jon_APEX> 6V -> 3.3V
[20:26] <Jon_APEX> nearly 50% loss
[20:26] <edmoore> a bit of heat helps
[20:26] <edmoore> 6->3 is quite a lot though
[20:26] <Jon_APEX> yeh thats the issue
[20:27] <edmoore> how much current do you want to pull?
[20:27] <Jon_APEX> its only the uP/GPS/radio
[20:27] <Jon_APEX> so 60mA ish?
[20:27] <rjharrison> What was that thing I put on icarus I to do the voltage drop
[20:27] <rjharrison> I'm sure it was a switching regulator
[20:27] <rjharrison> On your good advice
[20:27] <rjharrison> 12v = 5v
[20:28] <rjharrison> to
[20:28] <edmoore> i think switchers are fine
[20:28] <edmoore> but I use linears
[20:28] <Jon_APEX> fair enough
[20:28] <Jon_APEX> Once we get the lassen I'll set up a switch mode and see how it handles
[20:29] <Jon_APEX> tolerance is 1mV pp at 12Mhz says lassen specs, but 12mhz might be a harmonic of SMPS fx
[20:29] <edmoore> a small array of caps and it should be fine
[20:29] <Jon_APEX> OK
[20:29] <Jon_APEX> cheers guys
[20:29] <edmoore> of various values
[20:29] <Jon_APEX> Yep
[20:29] <edmoore> X = 1/j*omega*C
[20:29] <edmoore> etc yada yada
[20:30] <rjharrison> http://uk.farnell.com/jsp/search/productdetail.jsp?SKU=1470502
[20:30] <Jon_APEX> Nice
[20:30] <Jon_APEX> http://www.hexoc.com/balloon/gallery/displayimage.php?album=5&pos=0
[20:30] <Jon_APEX> that's the one we built for Apex I
[20:30] <edmoore> i hate that bloody white copper-clad board with a passion
[20:31] <Jon_APEX> Haha
[20:31] <Jon_APEX> why?
[20:31] <edmoore> it's white so ugly
[20:31] <Laurenceb> he the uv etch stuff
[20:31] <Laurenceb> racist
[20:31] <edmoore> but more importantly, the copper just peelsoff if you look at it too long
[20:31] <Laurenceb> yes
[20:31] <rjharrison> lol
[20:32] <Laurenceb> grr this ublox is annoying me
[20:33] <Laurenceb> I'm getting valid fix data
[20:33] <Laurenceb> but the sat count and status are screwed
[20:33] <Laurenceb> like they are out of alignment by a few bits
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[20:35] <Laurenceb> hmm I'm going to have to get I2C running
[20:36] <edmoore> we're going to break 30 in this channel soon
[20:36] <edmoore> Laurenceb: have you looked in the paparazzi CVS?
[20:37] <edmoore> they use both the ublox and the LPC2148
[20:37] <Laurenceb> hehe yeah
[20:37] <Laurenceb> there code is a bit bulbous
[20:37] <Laurenceb> I'm going to stick an atmega168 on "transceiverhab"
[20:37] <Laurenceb> so it only has one uart - for the um12
[20:38] <Laurenceb> so ublox will have to live on the i2c
[20:40] <DanielRichman> jcoxon, where's the #highaltitude PISG?
[20:44] <jcoxon> oh its not set up
[20:45] <jcoxon> what info do you want?
[20:47] <jcoxon> DanielRichman, http://www.pegasushabproject.org.uk/zeusbot/pisg/stats.html
[20:47] <DanielRichman> jcoxon, thx
[20:48] <Laurenceb> duhhhhh
[20:48] <Laurenceb> think I just worked out the issue
[20:48] <Laurenceb> answer==I cant count
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[20:52] <jcoxon> and we make 30
[20:53] <edmoore> wow
[20:53] <edmoore> a milestone
[20:53] <sbasuita> : )
[20:56] <g1zvn> do I get a Tshirt for being #30?
[20:59] <jcoxon> hehe, maybe
[21:06] <g1zvn> or some helium please? btw it's mc- here
[21:07] <Jon_APEX> we've got 6 metres cubed of helium we're not doing anything with
[21:07] <Jon_APEX> it's gotta go back next week if we don't use it
[21:09] <Jon_APEX> suggestions?
[21:10] <edmoore> apex2
[21:11] <Jon_APEX> Haha, I wish. Unfortunately, the chances of having the payload finished by next week are 0
[21:12] <SpeedEvil> I wonder how you'd store it.
[21:12] <edmoore> in a balloon
[21:12] <SpeedEvil> I mean over a period of a few weeks, outside the cylinder
[21:15] <Jon_APEX> Hmm
[21:16] <Laurenceb> ah finally
[21:16] <Laurenceb> ubx works
[21:17] <Laurenceb> now I just need some satellites :-/
[21:19] <Laurenceb> in a gas bag
[21:19] <Laurenceb> 3 sats... come on
[21:19] <Laurenceb> yesssss
[21:21] <Laurenceb> it needs a backup battery
[21:26] <Jon_APEX> For timekeeping I assume
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[21:33] <Laurenceb> yes
[21:34] <Laurenceb> and ephemeris ect
[21:41] <Laurenceb> brb
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[22:05] <laurence_> http://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=%4051.24327,-0.5933813&sll=37.0625,-95.677068&sspn=33.352165,79.101563&ie=UTF8&ll=51.243326,-0.593372&spn=0.000804,0.002414&t=h&z=19
[22:05] <laurence_> not bad
[22:05] <laurence_> receiver was on the arm of the bench there
[22:06] <Jon_APEX> Ah didn't know you're just down in Guildford :)
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[22:08] <laurence_> hehe
[22:08] <laurence_> wherabouts are you?
[22:09] <Jon_APEX> I'm in Ashtead, I go to school in Sutton
[22:10] <natrium42> *cough*britain is small*cough*
[22:10] <laurence_> cool
[22:11] <SpeedEvil> natrium42: not if you have to walk.
[22:11] <natrium42> hehe
[22:12] <laurence_> space shuttle launch looks really fast for some reason
[22:12] <laurence_> the acceleration seems greater
[22:12] <natrium42> canada is 40 times bigger by area :P
[22:12] <SpeedEvil> yeah
[22:13] <SpeedEvil> but you have freely available moose to ride.
[22:13] <laurence_> http://news.bbc.co.uk/1/hi/sci/tech/8044041.stm
[22:13] <natrium42> well, yes
[22:14] <laurence_> sounds like my cooker igniting
[22:14] <Jon_APEX> thats one hell of a cooker
[22:14] <laurence_> just increase the volume
[22:15] <laurence_> right next up is making the ublox work with i2c
[22:16] <SpeedEvil> IIRC it's .5G at the start (shuttle)
[22:17] Action: laurence_ sticks a ublox on the shuttle
[22:18] Nick change: laurence_ -> Laurenceb
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[22:31] <Laurenceb> hmm so launch is caturday ?
[22:31] <Laurenceb> I'm in ur heliumz, inflating ur balloonz
[22:31] <natrium42> who's launching?
[22:31] <SpeedEvil> longpayload is long.
[22:32] <Laurenceb> me
[22:32] <natrium42> tired meme is tared
[22:32] <natrium42> *tired
[22:32] <natrium42> Laurenceb, oh, cool
[22:32] <Laurenceb> and rjharrison
[22:32] <Laurenceb> I still have to build something
[22:32] Action: Laurenceb looks about
[22:33] Action: Laurenceb spots ublox5, avrs, um12 modules, stripboard, batteries...
[22:34] <natrium42> do a macgyver
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[22:35] <natrium42> here is background music for you http://www.youtube.com/watch?v=3w-oDZSLUrY
[22:35] <natrium42> :)
[22:35] <mc-> natrium, did you get my mail?
[22:35] <natrium42> yep
[22:36] <natrium42> i will panelize it a bit later today
[22:36] <mc-> anyone else with pcb layouts to add?
[22:36] <Laurenceb> looks like a typical hab launch
[22:36] <natrium42> mc-, including you i got 3 people
[22:39] <mc-> if you have some spare space, I'm happy to take some more pcbs.
[22:39] Action: SpeedEvil wishes he had something ready.
[22:47] <natrium42> mc-, is there an upper limit for pieces?
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[22:51] <sbasuita> Aight guys
[22:51] <sbasuita> Wrote a URL parser for herabot
[22:51] <sbasuita> Hope its handy
[22:51] <sbasuita> http://www.youtube.com/watch?v=QHbk0qNyk8Q
[22:51] <herabot> YouTube - HALO Parachute Jump
[22:51] <sbasuita> http://vimeo.com/3433474
[22:51] <herabot> Martlet 0 ground launch on Vimeo
[22:52] <sbasuita> In the middle of a sentence http://torrentfreak.com like this
[22:52] <herabot> TorrentFreak | Torrent News, Torrent Sites and the latest Scoops
[22:52] <sbasuita> ; )
[22:54] <sbasuita> Also, I think daniel has logging and stats working
[22:54] <mc-> natrium42, I'm happy to fill up if you have space left, how much space do you have?
[23:00] <sbasuita> Anyway, I'm going to get some sleep. Feel free to kick the bot if it goes mental or something (it shouldn't - hopefully :P)
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[23:06] <Laurenceb> http://imagebin.org/48710
[23:06] <herabot> Imagebin - A place to slap up your images.
[23:06] <Laurenceb> me walking
[23:08] <Laurenceb> diagonal=~10m
[23:10] <Laurenceb> lower left is constellation changes
[23:11] <Laurenceb> I waved my hand over the ant
[23:16] <rjharrison> Payload built
[23:16] <rjharrison> Off to bed
[23:16] <rjharrison> natrium42: Launches this w.e
[23:16] <SpeedEvil> neat
[23:16] <SpeedEvil> also - 24h position logs are good
[23:16] <SpeedEvil> gives you an example
[23:17] <SpeedEvil> gives you a good idea of where '0' really is I mean
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[23:28] <Laurenceb> SpeedEvil: 24h ?
[23:28] <Laurenceb> oh pos over 24h
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[23:52] Nick change: KingJ -> kingj
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[00:00] --- Tue May 12 2009