highaltitude.log.20101004

[00:02] <jonsowman> hmm
[00:02] <jonsowman> how to leave a msg
[00:02] <jonsowman> aha
[00:03] <jonsowman> done
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[00:32] <W0OTM> http://www.w0otm.com/iHAB/iHAB-2/Launch-Photos.html
[00:34] <kd0fxp> Flight today?
[00:34] <W0OTM> yesturday
[00:34] <kd0fxp> Aha.
[00:34] <kd0fxp> Pictures look great.
[00:35] <W0OTM> thx
[00:36] <kd0fxp> Not sure if NV1K has been spreading the word, but we're going for an altitude record this week.
[00:37] <DagoRed> I mentioned something in #hamradio kd0fxp
[00:37] <W0OTM> Good luck guys!
[00:37] <W0OTM> ill be rooting for you
[00:38] <kd0fxp> It's nice now that I have a new program written up that looks at the GFS winds predictions for a weeks time...then runs a prediction on each one
[00:39] <kd0fxp> I'll throw it out for download once I get a GUI put togeather
[00:39] <DagoRed> It is pretty handy.
[00:41] <W0OTM> awesome!
[00:43] <DagoRed> I hop to have a bot whipped up so we can post the APRS data in #sscl but given how busy I am lately, don't rely on it.
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[02:09] <Tekin> hi, anyone active here
[02:09] Nick change: madEngineer -> nv1k
[02:09] <SpeedEvil> not really
[02:09] <nv1k> shh
[02:10] <Tekin> :)
[02:10] <Tekin> well I have something that puzzles me
[02:10] <nv1k> go on...
[02:10] <Tekin> I get the idea of setting up a radio between the payload of the HAB and the computer
[02:10] <nv1k> yes
[02:10] <SpeedEvil> you can also use a wire.
[02:10] <Tekin> but what I don't get is how to transfer all the data I want, to the computer (I want shitloads of things)
[02:10] <Tekin> a 20 mile wire
[02:11] <nv1k> very thin wire :)
[02:11] <SpeedEvil> what sort of things?
[02:11] <nv1k> 9600 baud is pretty quick for most things
[02:11] <SpeedEvil> Range goes down as baud goes up.
[02:11] <nv1k> yes
[02:11] <Tekin> not only do I want temperature (x2) pressure
[02:12] <Tekin> besides all those usual stuff, I want to be able to control things from my computer
[02:12] <nv1k> what kind of things?
[02:13] <Tekin> hmm for example cutting the rope to the balloon over the computer when necessary
[02:13] <SpeedEvil> bidirectional is harder
[02:14] <nv1k> cutting the rope is quit easy
[02:14] <nv1k> *quite
[02:14] <nv1k> if you have relatively few commands you could get away with DTMF
[02:15] <Tekin> yeah just a couple
[02:15] <kd0fxp> that's how ArgentData controls their simplex repeater system
[02:16] <Tekin> but mostly, I will want GPS signals continuously transmitting to my computer, temperature readouts indoor and outdoor, pressure, altitude, magneto
[02:16] <nv1k> thats not really an entirely huge amount of data
[02:17] <kd0fxp> but continuous transmission would be a drain on the batteries
[02:17] <Tekin> not a problem
[02:17] <Tekin> I'll put thousands of them if necessary
[02:17] <kd0fxp> umm...weight issues come to mind with that...
[02:17] <Tekin> if not continuous, once every 15-30 seconds is good enough for me
[02:18] <Tekin> whats the FAA weight limit?
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[02:18] <nv1k> especially if every 30 seconds, that is no problem at all
[02:18] <SpeedEvil> Tekin: In the UK we send on 433MHz and 10mW
[02:18] <kd0fxp> ok, 15 sec is a big difference from continuous lol
[02:18] <SpeedEvil> Basically continually at 50bps
[02:18] <Tekin> oh and also, for every battery pack, I want batter status readouts
[02:19] <Tekin> voltage and percentage
[02:19] <SpeedEvil> yeah - easy
[02:19] <Tekin> SpeedEvil: easy for you, I've never done this before
[02:19] <kd0fxp> FAA is 6 pounds without reporting it...I think up to 12max without a time consuming waver
[02:19] <kd0fxp> waiver*
[02:19] <slothearn> will the FAA actually approve things >12 lbs.?
[02:19] <SpeedEvil> http://ukhas.org.uk/guides:tracking_guide
[02:19] <nv1k> yes
[02:19] <kd0fxp> if you have microcontroller experinece, it's cake
[02:20] <nv1k> we have flown 40+ payloads before
[02:20] <slothearn> nice :O
[02:20] <nv1k> 40+ lbs
[02:20] <Tekin> that's 2.72 killograms... I'm gonna shoot this thing off Turkey so I can prolly bring it up even more
[02:21] <Tekin> I can write the software, as long as I can connect and send the data to the computer and learn the API to get the data out of there to parse it
[02:21] <Tekin> but I need to know how to connect the pieces
[02:22] <nv1k> do you have a TNC or something similar already?
[02:22] <Tekin> nope
[02:22] <kd0fxp> make a shopping list :)
[02:22] <Tekin> that's easy
[02:23] <Tekin> how am I going to connect the batteries, temperature things to the radio? I read the tutorial on sparkfun
[02:23] <Tekin> wasn't much of a tutorial though :P
[02:23] <Tekin> more like an info thing
[02:23] <SpeedEvil> you jam a microcontroller in the middl
[02:23] <nv1k> if you use something like the open tracker
[02:23] <SpeedEvil> e
[02:24] <nv1k> you can almost directly connect 5 analog sensors
[02:27] <Tekin> I'm having a look at sparkfun now
[02:32] <slothearn> anybody got pics from their launches?
[02:34] <nv1k> http://picasaweb.google.com/kb0mgq/LX109B02#
[02:36] <Tekin> anyways thanks a lot
[02:36] <slothearn> yea these look like extremely fun projects :O
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[02:43] <DagoRed> My motorcycle! http://picasaweb.google.com/kb0mgq/LX109B02#5473484194421660994
[02:44] <slothearn> vroom!
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[02:46] <DagoRed> Sorry, I <3 my bike. Anyway....
[02:58] <androoid> wat the fuck
[02:58] <androoid> how do you guys do that
[02:59] <androoid> should smuggle drugs on those things
[02:59] <slothearn> o-O
[03:01] <DagoRed> androoid: What? How do we do what?
[03:04] <androoid> just kidding guys
[03:04] <androoid> howh do you guys know how to do this kinda stuff
[03:05] <nv1k> flip coins mostly
[03:05] <DagoRed> You can ask us. #sscl
[03:05] <nv1k> occasionally apply laws of physics
[03:07] <androoid> hm intesreting
[03:07] Action: slothearn smells a troll :P
[03:07] <androoid> well i just got into electronics
[03:07] <androoid> this is fun stuff
[03:08] <nv1k> it is fun
[03:08] <nv1k> slothearn: i'm not a troll, just cynical lol
[03:08] <DagoRed> very, and it's nice that the school pays for our toys :)
[03:08] <slothearn> nv1k: lol nah, I meant androoid
[03:08] <androoid> hm
[03:08] <slothearn> DagoRed: lucky
[03:08] <androoid> i wanan goto the school
[03:08] <androoid> what school you goto
[03:08] <slothearn> if I wanna do this it'll be out of pocket for sure
[03:08] <nv1k> ah
[03:15] <androoid> is iowa state a good school?
[03:17] <DagoRed> depends what you want out of it.
[03:17] <androoid> looking to do EE
[03:17] <DagoRed> I can say both fuck yeah and hell no.
[03:17] Action: DagoRed just graduated in EEE
[03:17] <DagoRed> *EE
[03:17] <androoid> oh nice
[03:17] <androoid> yeah i just finished up cs
[03:17] <DagoRed> what part of EE? RF? Controls? VLSI?
[03:17] <androoid> but cs is kinda boring
[03:18] <androoid> you know i'm not too sure
[03:18] <DagoRed> Heh, CS majors always make me laugh.
[03:18] <slothearn> congrats btw, DagoRed
[03:18] <DagoRed> Are you looking for a masters or double degree.
[03:18] <androoid> most likely masters
[03:18] <DagoRed> slothearn: I wouldn't say that, I'm grad school now in aerospace.
[03:18] <DagoRed> Same school though.
[03:18] <slothearn> well that's worth a congrats, isn't it? :P
[03:18] <androoid> i want to do combine my cs with ee, i like the whole gps field
[03:20] <DagoRed> slothearn: I guess, it's just I haven't really felt like anything changed so... I'm either humble or numb as a result.
[03:20] <nv1k> that would be cpre
[03:21] <DagoRed> androoid: Do EE, you can assume what happens in the middle.
[03:21] <androoid> yeah
[03:21] <DagoRed> The last chair of the EE department never took a ComputerE class and teaches mostly CprE classes as well as mostly published in CprE topics.
[03:25] <slothearn> welp, I'm out.
[03:25] <slothearn> got work tomorrow
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[03:27] <DagoRed> androoid: Unless you really feel like you need a masters, don't go for one. If you want to learn EE for a specific reason, go for it. Just be warned it's hard, and all the fun stuff isn't taught in the courses very well.
[03:27] Action: nv1k can't wait for grad school
[03:28] <androoid> oh man haha yeah thats the only thing keeping me from going to school again
[03:28] <DagoRed> nv1k is a CS minor and AerE major, and I can say he's more of an EE through being a HAM than one of our actual EE's in the lab.
[03:29] <androoid> i want to go back to school because my job right now is too boring, it's too mudane
[03:31] <DagoRed> what do you do?
[03:31] <DagoRed> Btw, with a masters that may get worse.
[03:31] <androoid> i currently do corporate programming, making an online banking system
[03:32] <DagoRed> that just sucks
[03:32] Action: nv1k is using my HF radio to listen to bears football game lol
[03:32] <androoid> i worked for a gps company last couple of years for a startup company
[03:32] <androoid> it sucks but it's a stable job
[03:32] <androoid> and it pays well
[03:32] <androoid> and it's not stressful
[03:33] <androoid> nv1k; nice
[03:33] <nv1k> little bit of overkill
[03:33] <DagoRed> nv1k: Really? Just a little?
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[06:02] <jcoxon> morning
[06:11] <Darkside> hi
[06:19] <jcoxon> hey Darkside just popping in
[06:19] <jcoxon> seems like your hf radio is going well
[06:19] <Darkside> heh
[06:19] <jcoxon> look forward to people decoding by HF :-p
[06:19] <Darkside> its working
[06:19] <Darkside> hehe
[06:20] <Darkside> well when i finish up a proper PCB it will all be released under creative commons
[06:20] <jcoxon> great
[06:20] <Darkside> currently i'm having fun getting the onewire libraries from arduino ported to the xmega
[06:21] <Darkside> even more fun when i don't really know C++ all that well
[06:21] <jcoxon> haha
[06:21] <jcoxon> right i have to dash
[06:21] <jcoxon> will chat later
[06:21] <jcoxon> cya
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[06:21] <Darkside> ../UART_Test.c:65: error: no matching function for call to 'DallasTemperature::DallasTemperature(OneWire (*)())'
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[07:13] <Darkside> hehe
[07:13] <Darkside> juxta was here a few minutes ago
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[08:09] <m1x10> hi
[08:15] <slothearn> yo
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[09:06] <Darkside> w00t
[09:06] <Darkside> got temp sensors working
[09:17] <m1x10> :p
[09:18] <Darkside> tis awesome
[09:18] <Darkside> now i just need to get my board into a box and it'll be ready
[09:18] <Darkside> :D
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[10:28] <kerblammo> Hey does anyone know a place to order sounding balloons in the EU?
[10:29] <SpeedEvil> yes
[10:30] <SpeedEvil> http://ukhas.org.uk/general:suppliers
[10:31] <kerblammo> Yeah, most of those are in the US, it seems. Import duties are fairly hefty here in Finland. I tried Random but they seem to be very busy right now, and out of stock.
[10:32] <kerblammo> Do you happen to know if the Totex/Kaymont 1000g is suitable for a 1kg payload? I'm a beginner at this. The neck load seems very low on the Kaymont site.
[10:33] <SpeedEvil> neck load is not the point at which it will fail.
[10:33] <SpeedEvil> It's the point at which it will meet the altitude spec with that load.
[10:34] <SpeedEvil> If you fill it 3 times that much, it will lift 3Kg (ish) but burst quite a bit earlier
[10:36] <kerblammo> OK, yeah I got it
[10:36] <kerblammo> thanks
[10:37] <kerblammo> I used the burst simulator and it seemed fine, but the specs seem so different it was good to check
[10:37] <kerblammo> between the 1200 and the 1000
[10:37] <Darkside> HAHAHA latest XKCD is lol
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[13:36] <SpeedEvil> Problems in metrology of rocket engines.
[13:36] <SpeedEvil> http://www.youtube.com/watch?v=upTYrixDbeU&feature=player_embedded
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[14:29] <Laurenceb> openpilot looks impressive
[14:29] <Laurenceb> i might nick their code
[14:29] <Laurenceb> as im evil and lazy like that
[14:29] <Laurenceb> wiki.openpilot.org
[14:30] <SpeedEvil> :)
[14:30] <Laurenceb> http://svn.openpilot.org/filedetails.php?repname=OpenPilot&path=%2Ftrunk%2Fflight%2FAHRS%2Finsgps.c <-madness
[14:30] <Laurenceb> i cant beleive someone actually went and worked that out by hand
[14:30] <Laurenceb> use a matrix library ffs
[14:31] <SpeedEvil> the brute force?
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[14:31] <SpeedEvil> Possibly a dodgy code generator
[14:32] <Laurenceb> yeah maybe - very impressive nonthless
[14:32] <Laurenceb> looks like they used EKF with position,velocity,attitude,gyrobias
[14:32] <Laurenceb> 13 component state vector
[14:33] <Darkside> 01:00 < Laurenceb> i might nick their code
[14:33] <Darkside> spoken like a true engineer
[14:33] <Laurenceb> thats a lot to work out - but they have a dedicated stm32 to do the position
[14:34] <Laurenceb> i dont really see why they need the rtos as theres two processors... guess it helps with the oversampling and interpolating they are doing
[14:34] <Darkside> holy crap that code is fucking insane
[14:34] <Laurenceb> oversampling is a nice move as well
[14:34] <Laurenceb> yes, but in a good way
[14:34] <Darkside> i'm not entirely sure whats going on there
[14:34] <DagoRed> Laurenceb: Doesn't matter, matrix math is something the microcontrollers are not optimized for. I can see why they would need to get creative.
[14:34] <Darkside> looks like some kind of weird state space crap?
[14:34] <Laurenceb> i cant believe it actually runs fast enough - shows how much it helps to crunch it all out like that
[14:35] <Laurenceb> Darkside: extended kalman filter
[14:35] <Darkside> we covered a bit of state space filtering in one of my control subjects
[14:35] <Darkside> jeez
[14:35] <Laurenceb> i was previously planning on something a bit simpler
[14:35] <Laurenceb> position, velocity, quaternion
[14:35] <Laurenceb> theyve stuck gyro bias in as well
[14:36] <Laurenceb> also they have a ublox5 on spi - another nice move
[14:37] <Laurenceb> ooh something interesting i just spotted, they have modified the standard EKF algorythm to use a Runge-Kutta estimator in the propogator
[14:37] <DagoRed> Where is this code?
[14:37] <Darkside> 01:00 < Laurenceb> i might nick their code
[14:37] <Darkside> argh
[14:37] <DagoRed> Heh, nice try.
[14:37] <Laurenceb> // ************* RungeKutta ********************** // Does a 4th order Runge Kutta numerical integration step
[14:37] <Laurenceb> these guys are coding gods
[14:38] Action: DagoRed wants a link
[14:38] <Laurenceb> http://svn.openpilot.org/filedetails.php?repname=OpenPilot&path=%2Ftrunk%2Fflight%2FAHRS%2Finsgps.c
[14:39] <DagoRed> thank you
[14:39] <Laurenceb> http://svn.openpilot.org/filedetails.php?repname=OpenPilot&path=%2Ftrunk%2Fflight%2FAHRS%2Fahrs.c
[14:39] <Laurenceb> downsample_data is a really sweet move
[14:40] <Laurenceb> proper fir filter as well
[14:41] <Darkside> oh man
[14:41] <Darkside> signal processing!
[14:41] <Darkside> :P
[14:41] <Darkside> got to do a signal processing subject last semester, but we used matlab for everything :(
[14:42] <Darkside> only recently got to do some simple FIR filters in java
[14:42] <Laurenceb> im tempted to try and rewrite this to one stm32 - it already seems to be built around PiOS
[14:42] <DagoRed> Is there a way to do checkout on this server?
[14:42] <Laurenceb> aha "piOS" seems to be their custom build of FreeRTOS
[14:43] <Laurenceb> DagoRed: should be - im no svn expert tho sorry
[14:43] <DagoRed> I've tried: svn co http://svn.openpilot.org/trunk/ and got nothing
[14:43] <Laurenceb> this is like someone did 6 months of work for me for free XD
[14:44] <Laurenceb> its pretty much all the features you want in a good state space kalman filtery thing rolled inot one
[14:44] <Laurenceb> with sensible hardware
[14:45] <Laurenceb> http://svn.openpilot.org/listing.php?repname=OpenPilot
[14:46] <Laurenceb> not sure how to check it out from there
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[14:54] <Laurenceb> wow the forum is a goldmine
[14:54] <Laurenceb> http://choosh.csee.ogi.edu/spkf/spkf_files/SPKF-INS-Overview.pdf
[14:54] <Laurenceb> thats a good link they posted
[14:55] <DagoRed> Hahaha, the helicopter they're using is the one that my friend developed for his research!!!
[14:56] <DagoRed> http://www.youtube.com/watch?v=cjmTYXBLOI8 and http://www.youtube.com/watch?v=DzVnVLEw2qc&feature=related are the helicopters we built in house and used to sell as turn key research platforms.
[14:56] <DagoRed> Our next iteration... holy crap.
[14:57] <DagoRed> crappy, I better head off to my DSP class.
[14:57] <DagoRed> bbl
[14:57] Nick change: DagoRed -> DagoRed|class
[15:05] <Laurenceb> this is the only place ive found where people who actually know what they're talking about are discussing this :D
[15:12] <Laurenceb> "I am cynical university professor in engineering going through a mid life crisis." <-thats the sort of person we need to talk to XD
[15:13] <Laurenceb> "in my opinion you are wasting time considering all these different variants of optimal state estimation (EKF, UKF, square root implementations, etc.). Just do a good job on the straight forward EKF and get it working. Maybe you are falling into the same trap as my graduate students and I do sometimes, where we let the explosion of bad (and some good) info in research articles overwhelm our decisions. You must realize that
[15:13] <Laurenceb> sounds like good advice
[15:18] <jerry507_mac> IMO if you're using a kalman filter you're already pushing the boundaries of good sense
[15:22] <SpeedEvil> :)
[15:22] <jerry507_mac> It'd be really nice if RC servo companies started making servos accept higher frequency PWM signals
[15:22] <Laurenceb> its a pretty awesome beast
[15:23] <Laurenceb> the kalman
[15:31] <Laurenceb> e.g. you take a 3 axis gyro and accel, and have attitude and gyro bias as the state vector
[15:32] <Laurenceb> the kalman will correct the yaw rate bias based on the imu behaviour when tilting
[15:32] <Laurenceb> despite the fact theres no heading reference sourc
[15:35] <jerry507_mac> It's just hideously expensive
[15:38] <Laurenceb> expensive huh?
[15:38] <jerry507_mac> They're running an entire 72MHz processor for that
[15:38] <Laurenceb> actually no - they overkilled
[15:39] <Laurenceb> and the other processor isnt doing much
[15:39] <Laurenceb> looks like they are using mediatec 10hz chipsets
[15:40] <jerry507_mac> How much are they using on the IMU?
[15:40] <Laurenceb> with custom firmware - i dont trust it
[15:40] <Laurenceb> i dont know, prob <50%
[15:40] <jerry507_mac> That's still an entire processor that I'd consider using though
[15:41] <Laurenceb> as they are using a slightly fudged EKF with hand tweaked matrix code
[15:41] <Laurenceb> the fir filtering is done with integers so that'll be very fast on a cortex M3
[15:41] <Laurenceb> - to downconvert the mems data
[15:42] Action: Laurenceb wonders if he should try the mediatec + custom firmware option
[15:49] <Laurenceb> http://www.epsontoyocom.co.jp/english/info/2010/0824.html <-yum
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[16:05] Nick change: DagoRed|class -> DagoRed
[16:10] <jonsowman> hjhj
[16:10] <jonsowman> uh, ignore.
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[16:31] Nick change: Max -> Guest40591
[16:38] <Guest40591> Hello, is it possible to design a baloon which could stabilize at a lower altitude - without explode - and travel through the wind, sending datas to the ground ?
[16:38] <Guest40591> powered by solar energy obviously
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[16:47] <SpeedEvil> google superpressure balloon
[16:47] <SpeedEvil> Basically, in principle it's possible
[16:47] <SpeedEvil> The envelope is more challenging to design.
[16:48] <Guest40591> ok, thanks for the info
[16:51] <Guest40591> I'm doing a master degree in interactive design and I would like to make a project of a baloon sending datas on twitter according to his location and what the sensors embeded are recording
[16:51] <Guest40591> that's why I need a long duration flight
[16:51] <SpeedEvil> How long duration?
[16:51] <SpeedEvil> If you get involved inthunderstorms, things get very complex.
[16:52] <SpeedEvil> Twitter is somewhat of a problem - internet connectivity is hard.
[16:52] <Guest40591> but it's looks really professional.. not really possible for amateurs
[16:52] <SpeedEvil> You're basically looking at sat-phones.
[16:53] <SpeedEvil> Especially for long duration.
[16:53] <Guest40591> I don't know, enough time to allow people to follow the twitter and make sense to create an exhibition after the flight
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[16:54] <Guest40591> I've seen some baloons are loosing the GPS connectivity after 24 km, it it always true ?
[16:55] <stilldavid> not always true, but for some chipsets it is
[16:56] <stilldavid> I think we've had the best luck with uBlox based chips
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[16:58] <Guest40591> have you ever heard about any amateur super pressure baloon lauch ?
[16:59] <Guest40591> I'm on the website of "spirit of knoxville"
[16:59] <Guest40591> quite interesting
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[17:14] <DagoRed> Guest40591: Got a link?
[17:14] <m1x10> My High altitude balloon flight system: based on ATMega324. Supports GPS,Servo,Jpeg Camera,Internal/External Temp, Pressure, Humidity, microSD, Ham Radio, external FTDI breakout and powered with 4AA. --> http://imagebin.org/116968
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[17:16] <W0OTM> iHAB-2 Photos are posted: http://www.w0otm.com/iHAB/iHAB-2/Launch-Photos.html
[17:17] <Guest40591> DagoRed > http://www.spiritofknoxville.com/index.html
[17:18] Action: m1x10 likes iHAB2 pics
[17:18] Action: DagoRed likes iHAB as well.
[17:19] <Zuph> m1x10: I'm working on a similar system: http://imgur.com/cpKyA.png
[17:19] <DagoRed> W0OTM: Only criticism of iHAB, build your payloads instead of using foam coolers.
[17:20] <DagoRed> You guys should see what we have up or sleeves for our baloons.
[17:20] <DagoRed> *balloons
[17:21] <m1x10> Zuph, nice
[17:22] <Zuph> m1x10: That image is about 3 revisions behind. That's what we sent to the PCB house, though. A couple minor errors and missing features which will be corrected next run-around.
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[17:23] <m1x10> :p
[17:23] <W0OTM> DagoRed: whats wrong with foam coolers?
[17:24] <DagoRed> W0OTM: Just slightly lacking in the wow factor.
[17:24] <DagoRed> I guess it's just a personal preforance.
[17:24] <DagoRed> *preference
[17:24] <Zuph> DagoRed: But ranking very, very high on the "Easy and cheap" factor :-P
[17:25] <DagoRed> Agreed.
[17:25] <W0OTM> DagoRed: In my assessment, I can't build a vehicle as light as what the foam coolers are
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[17:26] <W0OTM> DagoRed: by the time you figure in tape, glue ect
[17:26] <DagoRed> We've been getting lighter by building our own.
[17:27] <DagoRed> Plus, I found a method to make very strong and very light payloads using a fiber glass super structure and 2lb marine foam.
[17:28] <W0OTM> DagoRed: thats the beauty of this hobby, you get the opportunity to test anything :)
[17:28] <DagoRed> Very tre.
[17:28] <DagoRed> *true
[17:28] <DagoRed> btw, payload with that marine foam are being pushed up to the website, give me a minute and I'll have a link shortly
[17:31] <DagoRed> W0OTM: Click on idiot proof*, report final draft, and if you want final presentation. http://home.engineering.iastate.edu/~static09/Files/
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[17:39] <fsphil> earthshine, got a tomtom -- you're right, it's a bit rubbish
[17:45] <W0OTM> DagoRed: thats alot of work
[17:45] <W0OTM> DagoRed: :)
[17:46] <DagoRed> W0OTM: It actually isn't too bad. There is a picture of us on top of the roof doing a drop test (no parachute) with 12lb of sand.
[17:46] <DagoRed> Visibibly no damage was done.
[17:46] <W0OTM> DagoRed: how much did it weigh?
[17:46] <DagoRed> Almost a pound, and we used WAY to much foam.
[17:46] <W0OTM> DagoRed: 1 pound empty?
[17:47] <DagoRed> yup
[17:47] <W0OTM> DagoRed: thats seems like alot.
[17:47] <DagoRed> Well... we OVER built it, we can get it down to about just about 1/2lb if we remove some foam.
[17:47] <W0OTM> DagoRed: im no expert, but I wasn't really pleased my foam box weighed in a 120g
[17:48] <DagoRed> Well if we used just the foam we would have the same effect, and it's stronger then the styrofoam.
[17:48] <DagoRed> Plus... I like what we did. And the best part is that with APRS it's the worlds greatest beer cooler for floating down a river.
[17:49] <W0OTM> DagoRed: I agree, well done!
[17:49] <DagoRed> Thank you!
[17:49] <W0OTM> DagoRed: I think there is many ways to achieve it
[17:49] <W0OTM> DagoRed: there certainly isn't a right/ /wrong way
[17:49] <DagoRed> True, but we hate using off the shelf parts in the lab. We're elitist on that.
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[18:03] <fsphil> ping DanielRichman or sbasuita
[18:03] <DanielRichman> hi
[18:03] <fsphil> oh that was quick
[18:03] <DanielRichman> http://github.com/danielrichman/ssh_irssi_fnotify
[18:03] <fsphil> sweet
[18:04] <fsphil> basically, I need a sample image -- mind if I use one of the alien-1 shots?
[18:04] <DanielRichman> go ahead; they're all CC
[18:04] <DanielRichman> do you need a full res one?
[18:04] <fsphil> nah, it's for the image tx'ing thing
[18:04] <fsphil> glorious 320x240
[18:04] <DanielRichman> aaah, nice :D
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[18:09] <DanielRichman> fsphil: are you going to put the image on a dataflash or sd card and have the atmega read it? You can't fit that all into PROGMEM, let alone ram, can you?
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[18:10] <fsphil> the scaled version is only 7k - I think this chip has 32k progmem
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[18:17] <DanielRichman> ahh, nice
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[18:26] Nick change: nathan7 -> nathan8
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[19:01] <fsphil> new ssdv sample now up at: http://www.sanslogic.co.uk/ssdv/capture-20101004.flac
[19:01] <fsphil> will need the latest dl-fldigi from my github to decode it
[19:01] <fsphil> seems to work!
[19:03] <earthshine> fsphil: I won't say I told you so :P
[19:03] <fsphil> haha
[19:03] <fsphil> it looks nice, and even has a lovely interface
[19:04] <fsphil> but it lacks basic features the cheaper models have
[19:04] <earthshine> Yeah they do lo0ok good, but functionality is lacking
[19:11] <DanielRichman> fsphil: 300baud 8bit 1stop no parity?
[19:11] <fsphil> yea
[19:11] <fsphil> 350 shift
[19:11] <DanielRichman> it's working (!)
[19:11] <fsphil> haha
[19:11] <DanielRichman> this is awesome
[19:11] <fsphil> now try to untune it, then move it back -- see if it recovers ok
[19:12] <DanielRichman> and I skipped the first 5th of the transmission and it started just fine
[19:12] <DanielRichman> recovered from nowhere
[19:12] <DanielRichman> yup it recovers
[19:12] <DanielRichman> very cool
[19:12] <fsphil> fantastic
[19:12] <Guest40591> I'd like to have a high resolution video recorded, does anyone thought of using a GoPro HD camera ?
[19:13] <fsphil> also when the sample loops around, it should fill in the gaps (because the image ID hasn't changed)
[19:13] <Guest40591> should be resistant to everything in addition
[19:13] <natrium42> thought about it, yes
[19:13] <DanielRichman> fsphil: are you going to have it transmit the same picture a few times?
[19:13] <fsphil> stilldavid launched a gopro camera didn't he?
[19:14] <fsphil> DanielRichman, don't have enough memory to keep the entire image
[19:14] <DanielRichman> fsphil: I was thinking of making a TODO list for a2 today. I don't know yet but I think we'll fly a camera and an uplink so it might be a possibility
[19:14] <fsphil> the idea is that with multiple listeners all uploading to a server, most packets should be received
[19:14] <DanielRichman> did you write a server that would collect all the packets?
[19:15] <Guest40591> because I have one and I need a full HD video of the ascent, if someone wants to equip his balloon with mine.. :D
[19:15] <fsphil> I've got it saving into a database so far, going to start on the combining today
[19:15] <DanielRichman> Cool. Do it in python :P
[19:15] <fsphil> uplink would be great for retransmitting lost bits!
[19:16] <fsphil> I might! though I probably wouldn't get it done on time :)
[19:16] <DanielRichman> while it's a shameless plug the habitat stuff has the concept of "parser modules" which would be perfect for this kind of thing, IMO
[19:16] <fsphil> the bit that turns packets into a jpeg is written in C
[19:16] <fsphil> yea
[19:16] <DanielRichman> well what I meant to say was: under no circumstances do it in php ;-)
[19:16] <fsphil> well that's what I started doing it in :)
[19:17] <DanielRichman> hehe :P
[19:17] <DanielRichman> I don't mind really
[19:17] <DanielRichman> php doesn't really seem appropriate
[19:17] <fsphil> not for this kind of think, no
[19:17] <natrium42> is it ever?
[19:17] <natrium42> j/k
[19:18] <DanielRichman> hmm I recognise this picture somewhere
[19:18] <fsphil> I was thinking of having a little C app that takes the packets in stdin, spits out a jpeg on stdout
[19:18] <DanielRichman> Lost: 0
[19:18] <DanielRichman> :)
[19:18] <fsphil> lol
[19:18] <fsphil> good pic, better than anything I could point the camera at here :)
[19:20] <fsphil> the little camera i have won't be that good, even at 30km
[19:20] <natrium42> Guest40591, where are you located?
[19:20] <fsphil> (please say n.ireland ;-)
[19:21] <natrium42> !locate Guest40591
[19:21] <natrium42> !location Guest40591
[19:21] <natrium42> zeusbot is stupid
[19:21] <griffonbot> Guest40591 is located in the UK
[19:21] <natrium42> lol
[19:22] <DanielRichman> >.>
[19:24] <Guest40591> re. Sorry, I live in london
[19:25] <Guest40591> and France
[19:25] <Guest40591> depends
[19:25] <Guest40591> and I can also raise some funds for a lauch
[19:25] <Guest40591> sponsorships etc.
[19:26] <natrium42> ^ is pretty close to me :D
[19:27] <fsphil> the gopro can't be that heavy .. that and the badger could probably be launched with a smallish balloon
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[19:43] <Guest40591> the weight of the GoPro HD is around 160g, battery & waterproof-bombproof protection included
[19:45] <Guest40591> and 94 grams, naked with battery
[19:47] <Guest40591> if you know someone in th UK/France planning a lauch during the next 6 month... I can help in many ways and I have a GoPro :D
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[19:49] <jcoxon> evening all
[19:49] <fsphil> evening jcoxon
[19:51] Action: jcoxon had a bad day
[20:04] <fsphil> ah, hate that. esp. mondays
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[20:17] <Laurenceb> hi
[20:27] <SpeedEvil> ih
[20:29] <Laurenceb> anyone here used the bus pirate to flash an avr?
[20:30] Action: Laurenceb isnt having much luck with his programmer
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[20:30] <Upu> I used another Arduino
[20:30] <Laurenceb> getting invalid sygnature from all my devices :(
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[20:30] <Laurenceb> i think it may be the programmer
[20:31] <Laurenceb> the signals look ok tho... but i dont have acess to a scope atm
[20:31] <Upu> have you got a capacitor to the reset pin from DTR ?
[20:31] <Upu> Err I think DTR
[20:31] <Laurenceb> this is on breadboard
[20:31] <Upu> yeah so was mine
[20:31] <Upu> you need to reset the chip just before you flash it
[20:31] <Upu> hang on
[20:32] <DagoRed> Laurenceb: Which programmer?
[20:32] <Upu> http://arduino.cc/en/uploads/Main/arduino-duemilanove-schematic.pdf
[20:33] <DagoRed> nevermind, I read
[20:33] <Upu> note on the reset pin 100nF cap, to DTR on the serial
[20:33] <Upu> dunno if that's of any help
[20:34] <Laurenceb> dagoRed: "mysmartUSM mk2"
[20:35] <Laurenceb> its quite old - i havent used it for several months, it may just be broken
[20:35] <DagoRed> Ahh.
[20:35] <DagoRed> I've never used one of those.
[20:35] <Laurenceb> this is extremely annoying
[20:35] <Laurenceb> was hoping to get baseband extraction from the cc1020 working this evening
[20:38] <Laurenceb> murphys law ++
[20:39] <DagoRed> Heh.
[20:44] <m1x10> Take a look here for cap values of ftdi
[20:44] <m1x10> http://imagebin.org/116968
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[20:57] <Laurenceb> muhaha
[20:58] <Laurenceb> bus pirate works
[20:58] <Laurenceb> thats kind of annoying... guess i can still use my old programmer as a usb-uart
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[21:01] <Laurenceb> think id advise avoiding the myavr cr*p its been a ton of trouble before
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[21:03] <Laurenceb> tho come to think of it it could be due to the fact i shorted the output port :P lol
[21:03] <Laurenceb> ages ago and it was still working, but it could have caused damage i guess
[21:04] Action: Laurenceb realises noone cares so stfu
[21:05] <SpeedEvil> Progress on the sampling?
[21:14] <DagoRed> Laurenceb: I mostly use PIC's anyway.
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[22:13] <Laurenceb> SpeedEvil: not a great deal
[22:14] <Laurenceb> well.. ive written some code to dump the data at 1mbps for atmega168
[22:14] <Laurenceb> and ive found a cp2102 breakout board in my pile of junk
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[22:14] <Laurenceb> so hopefully it can all be put together to make a working sompler
[22:14] <Laurenceb> *sampler
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[22:17] <Laurenceb> course the proper way to do this would be with a usb micro like a atmega8u2
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[00:00] --- Tue Oct 5 2010