highaltitude.log.20100217

[00:00] <ProjectCirrus> im talking milliseconds
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[00:01] <ProjectCirrus> i just worry about the picaxe doing overhead processing and slightly affecting performance
[00:01] <natrium42> hey ProjectCirrus
[00:02] <ProjectCirrus> he there, i think im very much the new kid on the block here
[00:03] <natrium42> welcome to the channel :)
[00:03] <natrium42> i read some of the backlog, you're based in ireland?
[00:03] <ProjectCirrus> Yeah, Northern Ireland, Queens university Belfast
[00:04] <ProjectCirrus> we don't know if there have been any projects done over here
[00:04] <ProjectCirrus> we certaintly haven't heard of any
[00:04] <SpeedEvil> ProjectCirrus: do you have a hardware UART?
[00:05] <ProjectCirrus> frankly I don't know, i'll go check now
[00:05] <SpeedEvil> If you do - it doesn't matter
[00:05] <SpeedEvil> you tell the chip to send an A, and it does it
[00:05] <SpeedEvil> you don't have to worry about the timing
[00:05] <SpeedEvil> inter-char timing is not critical at all
[00:06] <SpeedEvil> intra
[00:06] <SpeedEvil> inter is
[00:07] <ProjectCirrus> I think I see what you are getting at, I'm a mech engineer and the terminology is new to me
[00:07] <ProjectCirrus> picaxe has a serout function which we could use... but
[00:07] <ProjectCirrus> it only goes to 300 baud and no slower
[00:08] <SpeedEvil> A hardware uart is a component on the chip which simply takes an A, a set baud rate, and transmits it.
[00:08] <SpeedEvil> A software UART deals with all the timing and bit-transitions itself.
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[00:09] <ProjectCirrus> that would be handy, i'll do abi of searching around the picaxe site to see if there is a software uart, however i think that the serout function utilises it and it only goes down to 300 baud. it will go up to 4800
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[00:10] <natrium42> whoops, lost signal there
[00:10] <SpeedEvil> look at the datasheet of the chip involved.
[00:10] <natrium42> ProjectCirrus, at least you are in the UK
[00:10] <SpeedEvil> See if it has a hardware UART.
[00:11] <natrium42> which has proven record with giving launch permissions :)
[00:13] <ProjectCirrus> caa have been great.... but we also have to talk to the iaa to give us a wider launch zone and over run protection
[00:13] <SpeedEvil> irish?
[00:13] <natrium42> i remember somebody here was trying to launch from ireland
[00:14] <SpeedEvil> they were having problems
[00:14] <natrium42> and was having problems with IAA
[00:14] <ProjectCirrus> uhh ohh
[00:14] <ProjectCirrus> :0
[00:14] <natrium42> ProjectCirrus, you could always travel to the mainland?
[00:14] <SpeedEvil> ProjectCirrus: where are you?
[00:14] <natrium42> "mainland"
[00:14] <ProjectCirrus> nelfast
[00:14] <ProjectCirrus> oops belfast
[00:15] Action: SpeedEvil wonders what faction calls it nelfast.
[00:15] <ProjectCirrus> the gree kit kat eaters
[00:15] <ProjectCirrus> green
[00:15] <ProjectCirrus> ahh sure we all love each other now
[00:15] <ProjectCirrus> no more blowing each other to bits
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[00:16] <SpeedEvil> Launching from the mainland may be a good plan.
[00:16] <ProjectCirrus> it would be nice to get a first launch for northern ireland though
[00:16] <SpeedEvil> who was the irish launcher?
[00:16] <natrium42> i can't remember :(
[00:17] <natrium42> and too lazy to search logs
[00:17] <ProjectCirrus> if the iaa doesn't play ball we just have a tighter flying zone
[00:17] Action: SpeedEvil would search the logs but I'd have to get out of bed to search.
[00:17] <natrium42> http://www.pegasushabproject.org.uk/zeusbot/search.html
[00:17] <natrium42> ooh
[00:17] <natrium42> forgot about that ^
[00:17] <SpeedEvil> Actually - I don't know which bit of ireland he was in.
[00:18] <ProjectCirrus> there are quite a few airports to the west and then dublin is quite a big hub in the east
[00:18] <ProjectCirrus> that might have caused problems
[00:18] <natrium42> ei7ig?
[00:18] <SpeedEvil> possibly
[00:19] <ProjectCirrus> well i e-mailed the iaa two days ago so heres hoping
[00:19] <natrium42> EI5GTB
[00:19] <natrium42> i think that was him
[00:19] <natrium42> yep --> http://paulsnet.org/myshack/
[00:20] <ProjectCirrus> i'll look him up
[00:20] <natrium42> ProjectCirrus, you should get in touch with that guy
[00:20] <natrium42> he might help you with tracking at least :)
[00:23] <ProjectCirrus> very true, he's got quite a set up, but no contact information by the looks of things
[00:23] <ProjectCirrus> i'll maybe look him up on facebook
[00:26] <ProjectCirrus> thanks
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[00:30] <natrium42> yay for coffee shop wifi
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[00:31] Action: SpeedEvil dropped his thermos.
[00:31] <SpeedEvil> Meh.
[00:31] <ProjectCirrus> not long till were living under a wifi blanket i reckon
[00:31] <SpeedEvil> (I was using it so I could have cofffee in the mornign without getting out of bed.
[00:31] <natrium42> haha
[00:32] <natrium42> can't you program your coffee maker?
[00:32] <natrium42> (and put it beside your bed_
[00:32] <fergusnoble> rjharrison: hi, sorry I missed you twice now
[00:32] <SpeedEvil> No coffee maker.
[00:32] <fergusnoble> hows it going?
[00:32] <SpeedEvil> And it's 6C inside - hence...
[00:32] <natrium42> yo fergusnoble
[00:32] <fergusnoble> hi natrium42!
[00:33] <fergusnoble> how are you?
[00:33] <natrium42> great, and you?
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[00:34] <fergusnoble> not bad, lots of uni work atm so not been doing much habing
[00:35] <natrium42> aah
[00:36] <natrium42> gotta run
[00:36] <natrium42> later all
[00:36] <SpeedEvil> wave.
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[00:37] <ProjectCirrus> thanks
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[00:51] <ProjectCirrus> each time a play my constructed rtty letter a i get several random letters comin out of fldigi
[00:51] <ProjectCirrus> mmm
[00:52] <ProjectCirrus> if its 50 baud am i right in telling each bit to last 0.02 seconds?
[00:52] <SpeedEvil> yes
[00:54] <ProjectCirrus> so i wonder how can i be getting several characters of data from one single transmission of 9 0.02 second bits
[00:55] <ProjectCirrus> could it be the microphone on my computer messing it up
[00:56] <SpeedEvil> yes
[00:56] <SpeedEvil> what are you geenrating the tones in
[00:56] <ProjectCirrus> audacity with very specific tone length settings
[00:57] <ProjectCirrus> im really beginning to suspect the michrophone... cue the hunt for a 3.5mm cable :)
[00:57] <ProjectCirrus> wow my spelling has gone to pot sitting at a computer all night
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[07:03] <rjharrison> http://www.zlib.net/maxino06_fletcher-adler.pdf
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[09:49] <MikeMc68> morning all
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[09:59] <Laurenceb> Randomskk: did you find an eagle footprint for the st dual axis gyro?
[09:59] <Laurenceb> LPR530ALH
[10:14] <juxta> hi all
[10:14] <russss> http://www.radarvirtuel.com/ is my new favourite thing, ever.
[10:19] <juxta> thats quite a few planes
[10:20] <juxta> how is the data pulled russss?
[10:20] <russss> http://en.wikipedia.org/wiki/Automatic_dependent_surveillance-broadcast
[10:20] <russss> the planes broadcast it
[10:20] <russss> the little green dots on the map are receivers
[10:21] <juxta> ahh I se
[10:21] <juxta> see*
[10:22] <juxta> that's very cool, wish it covered my part of the world though
[10:22] <russss> you just have to buy a receiver and you can add it to their map ;)
[10:22] <russss> (the receivers are about £400 unfortunately)
[10:22] <russss> I was trying to write an ADS-B decoder for my USRP, I haven't got very far though
[10:23] <russss> this is the most popular one, I think http://www.kinetic-avionics.co.uk/sbs-1.php
[10:27] <juxta> nifty
[10:28] <juxta> what frequency bands does it use russss?
[10:28] <russss> it varies, but commercial aviation is standardised on 1090MHz
[10:29] <russss> which is the same frequency that standard transponders use
[10:31] <MikeMc68> cool - no need to buy a receiver when I can just log into this website now ;)
[10:31] <russss> true
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[10:44] <rjharrison_> Hi all
[10:48] <rjharrison_> FYI CRC-CCITT is now implemented in the listener and sentences can now be checksumed using *HHHH where HHHH is the CRC-CCITT checksum using the polynomial x^16+x^12+x^5+1
[10:48] <russss> nice
[10:49] <rjharrison_> junderwood currently you will have to let me know when your payload flys as it will need a single tweek for fletcher to be used instead will fix this later
[10:49] <rjharrison_> I'll be publishing some functions and examples of how to use this checksum in your code :)
[10:50] <rjharrison_> But not today :)
[10:50] <junderwood> rjharrison, np. Will let you know
[10:50] <junderwood> Why did you decide to go for CCITT in the end?
[10:51] <rjharrison_> hi fergusnoble got your message in the log thanks for that
[10:51] <rjharrison_> junderwood, due to the detection of bit bursts being better in CRC 16 vs 8
[10:51] <rjharrison_> We will have all three in place
[10:52] <rjharrison_> I think it's unlikely to get long bursts of 000's or 111's
[10:52] <rjharrison_> Will try both to see how they fair in practice
[10:55] <rjharrison_> In the future the XML will contain the type of checksum in use and will parse the XML file through to the tracker for decoding purposes.
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[11:01] <blomlet> I guess it would be inappropriate for the telemetry of James' balloons to appear via http://www.radarvirtuel.com
[11:05] <rjharrison_> blomlet yep best keep off that
[11:06] <rjharrison_> Is that the locations of all flying commercial aircraft ATM
[11:07] <russss> yep
[11:07] <russss> well, all of them that are in range of the receivers. Looks like there's a bit of black spot in spain
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[11:22] <Randomskk> Laurenceb: re the ST gyro, nope, didn't look, but the ref-packages lib has footprints for all standard carriers so you'd just need the symbol
[11:22] <Laurenceb> I've got it nvm
[11:22] <Laurenceb> Randomskk: I'm working on a pcb design - stm32 with the sensors off the razor imu
[11:22] <Randomskk> sounds good
[11:23] <Randomskk> that's pretty much my plan for my flight control, once motor controllers are done and I've prototyped it somewhat
[11:23] <Laurenceb> we could possible work together?
[11:23] <Laurenceb> as we pretty much want the same thing - maybe you dont need pwm as much
[11:23] <Randomskk> would be happy to
[11:24] <Laurenceb> but thats just one ic
[11:24] <Laurenceb> could be left unpopulated for quadcopter
[11:24] <Randomskk> though atm I don't have enough time to sleep, let alone anything else - after this week it all gets a lot better though
[11:24] <Randomskk> and five weeks of vacation in three weeks
[11:24] <Laurenceb> my plan is sensors and silabs ic on one side and stm32, vreg, and pwm switching on the other
[11:25] <Randomskk> after today it gets a lot better, heck, but after tomorrow even better and by the end of friday I'm very happy
[11:25] <Laurenceb> so one side for reflowing other hand soldered
[11:25] <Randomskk> hand soldering the stm32?
[11:25] <Laurenceb> heh I'm pretty busy too
[11:25] <Laurenceb> yeah
[11:25] <Randomskk> certainly doable but not much fun
[11:25] <Laurenceb> well... if you dont want to hand solder it... QFN stm32 :P
[11:26] <Laurenceb> even smaller
[11:26] <Randomskk> QFN'd be better
[11:26] <Randomskk> I like getting as much as possible on one side though, reflowing the whole thing makes life so much easier
[11:26] Action: Laurenceb has soldered harder stuff than the 48 pib stm32
[11:26] <Laurenceb> *pin
[11:26] Action: Randomskk hand soldered the 100pin tqfp stm32 :P
[11:26] <Laurenceb> yeah - I have a hot air station, but I still want to try a reflow oven
[11:26] Action: Randomskk would rather reflow it next time though
[11:27] <Randomskk> pcb costs per area is smaller than manufacture time/cost for dual sided components
[11:27] <Laurenceb> I've gtg
[11:27] <Randomskk> and pcb mass is pretty much negligable compared to batteries, motors and chasis
[11:27] <Randomskk> okay
[11:27] <Laurenceb> enjoy the work :D
[11:27] <Randomskk> :D
[11:27] <Randomskk> beam deflection...
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[12:11] <rjharrison_> Hi juxta
[12:11] <rjharrison_> Any thoughts on launch
[12:11] <rjharrison_> Randomskk do you know why the CUSF predictor is using out of data data
[12:13] <rjharrison_> out of date data
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[12:29] <Randomskk> uh
[12:29] <Randomskk> shouldn't be
[12:29] <Randomskk> something going a bit wrong presumably
[12:29] <Randomskk> it was broken a couple of days ago, fergus said he fixed it
[12:29] <rjharrison_> yep did you rwit the GIT
[12:29] <rjharrison_> Write
[12:30] <rjharrison_> fingers broken
[12:30] <Randomskk> I haven't played with it at all
[12:30] <rjharrison_> Ohh mixed comms from somewhere
[12:30] <Randomskk> I do have access to it but haven't played with it enough to debug
[12:31] <Randomskk> also gotta run briefly for a lecture then supervision :(
[12:31] <Randomskk> this week is brutal
[12:31] <rjharrison_> Ok np
[12:31] <rjharrison_> ttfn
[12:31] <rjharrison_> Yep so i see ^^^
[12:34] <Laurenceb> Randomskk: the QFN stm32 only seems to be 36 pin
[12:35] <Laurenceb> that might not be enough IO...
[12:35] <Laurenceb> not sure yet tho - need to finished the schematic
[12:35] <Laurenceb> bbl
[12:35] <Laurenceb> ideally 48 pin so theres plently of io but its not a pain to solder
[12:36] <SpeedEvil> there are bigger ones IIRC
[12:37] <SpeedEvil> Think carefully about multiplexing
[12:37] <SpeedEvil> and CS
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[13:45] <rjharrison_> Laurenceb did you ever play with a cc1101
[13:45] <rjharrison_> from TI
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[13:45] <rjharrison_> I'm thinking about having a play
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[14:40] <juxta> hmm, anybody know how I can group some items together in the eagle PCB editor?
[14:40] <juxta> specifically a header and a bunch of text labels
[14:51] <junderwood_> rjharrison, BadgerCub and Badger2 both use CC1111s (pretty-much the same thing)
[14:52] <junderwood_> juxta, use the group select tool?
[14:53] <juxta> junderwood_: is there a way I can have them stick together somewhat permenantly?
[14:53] <juxta> ie so that I can't accidentally move one of them alone in futur
[14:53] <juxta> future
[14:54] <junderwood_> not that I'm aware of (other than making a custom library component)
[14:54] <juxta> ah well :)
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[15:22] <rjharrison_> back
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[15:42] <junderwood_> rjharrison, you asked about the TI CC1101. BadgerCub and Badger2 both use the CC1111 which is almost the same thing
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[16:06] <rjharrison_> jcoxon he's not arround
[16:07] <rjharrison_> are you going to complain about the data being out of date :)
[16:07] <jcoxon> hehe, i don't personally mind as i can still run forecast :-p
[16:08] <jcoxon> but the risk is that i've made a mistake so i do like to compare my results to cusf
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[16:14] <junderwood_> This weekend looks good as long as you don't mind going east
[16:15] <jcoxon> junderwood_, oh its better then that
[16:15] <jcoxon> :-)
[16:15] <jcoxon> will upload a tack
[16:15] <jcoxon> trackI*
[16:18] <jcoxon> junderwood_, http://www.pegasushabproject.org.uk/kml/bh4forecast.kml
[16:20] <junderwood_> I see. This one won't be coming back!
[16:20] <junderwood_> Well placed for the channel island ham, though
[16:20] <junderwood_> I assume you're planning to go for it?
[16:21] <jcoxon> i'm not sure
[16:21] <jcoxon> logistics are an issue
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[16:23] <junderwood_> It looks like it may be sensitive to float altitude. Have you checked what happens with +/- 5km float altitude?
[16:24] <jcoxon> junderwood_, oh yes
[16:24] <jcoxon> its very
[16:24] <jcoxon> above 21km and it tails back
[16:24] <jcoxon> as we've got ballast tanks onboard there "fingers crossed" would be float altitude changes
[16:25] <jcoxon> also at a particular altitude it'll overfly london
[16:27] <jcoxon> so its a tough one
[16:28] <jcoxon> though better looking then last weekend
[16:29] <russss> needs a colourful map showing the different flight paths for different altitudes ;)
[16:29] <jcoxon> okay okay, will do that in a minute
[16:32] <junderwood_> I bet it will look like a spider's web
[16:32] <junderwood_> of course, with the ballast, you can just program your desired float altitude
[16:32] <junderwood_> .... and pray
[16:33] <jcoxon> hehe
[16:33] <jcoxon> though overshooting is an issue :-p
[16:33] <junderwood_> when it's gone, it's gone ...
[16:34] <junderwood_> you need to have the ability to dump He as well
[16:35] <jcoxon> thats a whole different project
[16:46] <rjharrison_> jcoxon I ran a wyoming I don't think > alt is a goer
[16:46] <rjharrison_> But will wait till tomorrow
[16:48] <rjharrison_> do we have a max user count for HA as it was quite loaded on Saturday
[16:49] <jcoxon> 54
[16:49] <rjharrison_> Nice
[16:50] <rjharrison_> A little bigger than the old days
[16:54] <jcoxon> russss, as requested: http://www.pegasushabproject.org.uk/kml/02201500-all.kml
[16:55] <jcoxon> 18 - 34 in 2km jumps, starts with the most east and works itself round
[16:56] <junderwood_> Wow. Not much point in having a predictor!
[16:56] <junderwood_> I'm guessing that with that much wind shear it would have a very bumpy ride.
[16:57] <russss> crazy
[16:59] <jcoxon> well sort of, basically, anything above 20km is sort of in the same direction
[16:59] <russss> with a wind pattern like that, and ballast and a cutdown, you could have some fun trying to get the most precise landing spot
[17:03] <rjharrison_> Wow what a mess
[17:03] <rjharrison_> Spider is right
[17:14] <jcoxon> right bbl
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[17:18] <SpeedEvil> Slightly related - anyone know how I get details of when imagery was taken - with the historical imagery tab?
[17:18] <SpeedEvil> on google earth
[17:19] <sbasuita> SpeedEvil, does it not show a month and year in the top left?
[17:21] <SpeedEvil> no
[17:22] <SpeedEvil> I should probably try updating the program
[17:22] <russss> I get a little slider to choose the date
[17:23] <SpeedEvil> or rather - I get the slider - but the rightmost 'dot' - is undated - and more recent than the one labelled '2006' - which seems not to be 2006
[17:23] <russss> oh I see
[17:23] <russss> yeah I think the closest date you get for the recent imagery is the copyright date it shows.
[17:24] <russss> I'm not sure I believe that though.
[17:25] <russss> yeah that 2010 date is bullshit
[17:25] <SpeedEvil> Well - according to the dates - people have been unbuilding houses, and putting back fields :)
[17:26] <russss> actually, wait.
[17:26] <russss> I have something in the bottom left here which says "Imagery Date: Dec 31, 2005"
[17:27] <russss> yeah
[17:27] <russss> if you zoom in far enough
[17:27] <SpeedEvil> how did I miss that.
[17:27] <SpeedEvil> yeah
[17:27] <russss> not sure, heh
[17:27] <russss> seems to be a bug in London though
[17:28] <SpeedEvil> Oddly - 1999 is to the right of 2006 :)
[17:28] <russss> because it shows "Dec 31 2005" when there appears to be 2006 imagery available
[17:29] <russss> slider in the top left says Dec 31 2006, bottom left says Dec 31 2005
[17:29] <russss> confusing
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[19:02] <jcoxon> evening all
[19:03] <MikeMc68> evening
[19:03] <LazyLeopard> hi
[19:04] <jcoxon> hey
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[19:15] <MikeMc68> Hey Rick
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[19:53] <Hiena> Anybody from Palo Alto area?
[19:53] <Hiena> I'm interested about this morning weather condition.
[19:55] <Laurenceb> rjharrison:I have cc1020 eval board
[19:55] <Laurenceb> did some crude range tests thats all
[19:55] <Laurenceb> ~1km in heavyily built up area with crude monopoles at each end
[19:59] Action: SpeedEvil wants some magnetic monopoles.
[19:59] <MikeMc68> Hiena: Why what happened this morning?
[20:00] <Hiena> Major power outage. The Tesla Motors execs plane hit a power line. Three dead, and a house burned.
[20:06] <Laurenceb> seriously?
[20:07] <Laurenceb> http://mashable.com/2010/02/17/tesla-motors-plane-crash/
[20:07] <Laurenceb> oh musk is ok
[20:07] <Laurenceb> the us space program is saved then
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[20:09] <LazyLeopard> Not much here --> http://news.bbc.co.uk/1/hi/world/americas/8520875.stm
[20:10] <Laurenceb> Randomskk: actually - http://uk.farnell.com/stmicroelectronics/stm32f103t8u6/mcu-32bit-arm-cotrex-m3-36vfqfpn/dp/1606329
[20:10] <Laurenceb> thats looks doable
[20:10] <rjharrison> Boo
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[20:10] <rjharrison> Laurenceb ooh nice
[20:11] <rjharrison> Hi RobertB
[20:11] <Laurenceb> rjharrison: I have a test payload ready to fly
[20:11] <Laurenceb> with chipcon and ublox5
[20:11] <rjharrison> ooh
[20:11] <Laurenceb> two way link - up and down
[20:11] <rjharrison> Chipcon ?
[20:11] <rjharrison> ooh
[20:12] <rjharrison> using what as the tranceiver
[20:12] <Laurenceb> avr
[20:12] <rjharrison> I ordered the CC1101 eval
[20:12] <Laurenceb> and talking to my laptop
[20:12] <Laurenceb> CC1020 has better sensitivity
[20:12] <rjharrison> ooh typical
[20:12] <rjharrison> Should have read more
[20:12] <rjharrison> Is it very similar?
[20:12] <Laurenceb> I think so
[20:13] <Laurenceb> I worked out a way to use it as a scanner
[20:13] <Laurenceb> by using a test mode to grab data from the ADC
[20:13] <Laurenceb> and reconstructing the baseband
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[20:13] <rjharrison> Humm outa my depth
[20:14] <Laurenceb> you can borrow my boards if you promise not to fry them
[20:14] <rjharrison> I'm hoping to use it on Icarus as a tranceiver
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[20:14] <Lunar_Lander> hello
[20:14] <rjharrison> I'll cook my own ones
[20:14] <rjharrison> :)
[20:14] <rjharrison> Ig it looks a goer I get a 1020
[20:15] <Laurenceb> mouser is a place to look
[20:15] <Laurenceb> also look at the amber wireless modules
[20:15] <Laurenceb> and silabs
[20:15] <Laurenceb> silabs ICs are as good and have a packet engine built in, but you can pull off the scanner trick
[20:16] <Laurenceb> amber wireless is silabs transceiver and a ti micro on a module
[20:16] <Laurenceb> also the sparkfum silabs modules
[20:17] <Hiena> Anybody has a link for a DIY gyroscope? I had another major budget cut, so i have to cook own one...
[20:17] <Laurenceb> for the autopilot board Im designing designing I'm thinking silabs
[20:17] <Laurenceb> Hiena: st gyros are so cheap
[20:17] <Hiena> Define cheap.
[20:17] <Laurenceb> $5
[20:18] <Hiena> From which supplier?
[20:19] <Lunar_Lander> hello
[20:20] <Hiena> Also the 5 USD will be 9 after the tax and the shipment prices.
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[20:21] <Lunar_Lander> hi jcoxon
[20:21] <jcoxon> hey Lunar_Lander
[20:21] <rjharrison> hi jcoxon
[20:22] <jcoxon> hey
[20:30] <Lunar_Lander> how's life?
[20:30] <jcoxon> not bad thanks
[20:30] <jcoxon> how about for you?
[20:30] <Lunar_Lander> well, my dad was taken to hospital a few mins ago
[20:31] <Lunar_Lander> my feelings are accordingly
[20:31] <jcoxon> oh i'm sorry to hear that
[20:32] <Lunar_Lander> yes
[20:32] <Lunar_Lander> I wonder what the problem is and hope he'll get OK again
[20:35] <jcoxon> fingers crossed
[20:35] <Lunar_Lander> yes
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[20:50] <Laurenceb> Randomskk: what do you say to a microsd card slot?
[21:08] Nick change: edmoore_ -> edmoore|away
[21:20] #highaltitude: mode change '+o jcoxon' by ChanServ!ChanServ@services.
[21:20] Topic changed on #highaltitude by jcoxon!jcoxon@host86-156-36-88.range86-156.btcentralplus.com: Welcome to #highaltitude - discuss anything to do with high altitude projects (balloons, gliders, etc) www.ukhas.org.uk, wiki.ukhas.org.uk, BH4 launch 20/2/10 15:00UTC
[21:25] Nick change: RocketBoy -> RocketBoy|Away
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[21:35] <rjharrison> humph
[21:35] <rjharrison> Bloody CCITT
[21:35] <rjharrison> MSB ! LSB first
[21:35] <rjharrison> Bollox wank shit etc...
[21:36] <rjharrison> Any one out there cleaver enough to know how I feed it around the the other way
[21:37] <rjharrison> anyhow by feeding it into the _crc_xmodem_update funtion it seems to work just dandy and give the CCITT result
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[21:41] <RocketBoy> \o/ whats the problem - just shifting direction?
[21:49] <RocketBoy> oh endian I guess - C sorts that for you
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[21:52] <rjharrison> RocketBoy
[21:52] <RocketBoy> yo
[21:53] <rjharrison> I just seem to use the xmodem one and I'm fine
[21:53] <rjharrison> using ccitt = bad
[21:53] <rjharrison> weird
[21:53] <RocketBoy> why?
[21:53] <rjharrison> but xmodem gives the ccitt result i need :)
[21:54] <RocketBoy> then that's fine just nick the code
[21:54] <rjharrison> http://pastebin.com/m7c1a0b45
[21:55] <RocketBoy> its a 16bit CRC - and I doubt the we know enough to sensibly choose between 16bit CRCs
[21:57] <rjharrison> Oh but using the xmodem function which is the same polynomial function as CCITT just LSB first not MSB and hey presto it give the CCITT result]
[21:57] <rjharrison> http://www.avrfreaks.net/index.php?name=PNphpBB2&file=printview&t=77165&start=0
[21:57] <rjharrison> This explains it just not sure why
[21:58] <RocketBoy> so crc_xmodem_update is a library function?
[21:59] <rjharrison> http://www.nongnu.org/avr-libc/user-manual/group__util__crc.html
[21:59] <rjharrison> Cos I'm lazy and it's nice asmbler
[22:01] <RocketBoy> there must be a crc_xmodem_init() or similar
[22:07] <RocketBoy> no - i see crc is a running calculation set to 0FFFF initally
[22:13] Nick change: grummund_ -> grummund
[22:13] <RocketBoy> however not much use unless your using an AVR
[22:24] <Lunar_Lander> hi RocketBoy
[22:25] <RocketBoy> Lunar_Lander: hi
[22:27] <Lunar_Lander> how's life?
[22:28] <RocketBoy> cool - just playing with some dominoEX code for Atlantic halo
[22:28] <Lunar_Lander> nice
[22:32] <RocketBoy> Lunar_Lander: R U planning any payloads?
[22:32] <Lunar_Lander> well I am at the beginning
[22:32] <Lunar_Lander> but look at this: http://projectvortex.weebly.com/scientific-plan.html
[22:33] <Lunar_Lander> that was planned for a manned flight which I once had in mind before going to unmanned
[22:44] <RocketBoy> that's some project
[22:45] <Lunar_Lander> yes
[22:46] <Lunar_Lander> and expensive too
[22:46] <Laurenceb> the 1933 photo is awesome
[22:46] <Lunar_Lander> that's why I look into unmanned
[22:46] <Lunar_Lander> yeah
[22:46] <Lunar_Lander> that is the highest open-basket oxygen mask ascent on record
[22:49] <RocketBoy> cool
[22:50] <Lunar_Lander> yeah
[22:50] <Lunar_Lander> I read an account on the flight
[22:50] <Lunar_Lander> and actually they wanted to make another ascent in the winter of 1933/34
[22:51] <Lunar_Lander> but the nazi regime ordered the balloon to Bitterfeld for two other flyers for a record flight
[22:51] <Lunar_Lander> and they did not spend as much preperation on oxygen system as the group which made that ascent
[22:51] <Lunar_Lander> and they died at 10 km altitude and crashed after 15 hours in Latvia
[22:54] <RocketBoy> bad news for them and the Nazis
[22:56] <Lunar_Lander> yes
[22:57] <Lunar_Lander> I found records of manned research flights until 1937
[22:57] <Lunar_Lander> and then nothing more
[22:57] <Lunar_Lander> so 1937 was the end of manned research ballooning
[23:00] <russss> I'm aware this is slightly old, but it's awesome: Atlas V rocket they launched last week broke the sound barrier in an ice cloud: http://www.youtube.com/watch?v=SsDEfu8s1Lw
[23:00] <russss> you can see the shock wave
[23:01] <Lunar_Lander> cool
[23:01] <russss> it's at about 1:50 in
[23:01] <RocketBoy> Lunar_Lander: I guess it was only really sensible to do it to a certain altitude anyway - beyond that you need spacesuits - like project Excelsior
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[23:02] <Lunar_Lander> yes
[23:02] <Lunar_Lander> oh and there were the stratosphere flights 1931-1935
[23:02] <Lunar_Lander> with the metal capsules
[23:08] <RocketBoy> really - cool
[23:10] <Lunar_Lander> yeah
[23:10] <Lunar_Lander> a very interesting read is "The National Geographic Society - US Army Air Corps Stratosphere Flight of 1935 in the Balloon "Explorer II""
[23:11] <Lunar_Lander> there are some copies of it on abebooks.com
[23:11] <Lunar_Lander> and maybe a library owns it too
[23:18] <Lunar_Lander> anyway
[23:18] <Lunar_Lander> RocketBoy
[23:18] <Lunar_Lander> jcoxon said that one cannot possibly pack 15 experiments into an unmanned balloon
[23:18] <SpeedEvil> depends.
[23:19] <SpeedEvil> It's gonna take some thought.
[23:19] <SpeedEvil> But several sensors can sometimes do multiple experiments
[23:20] <SpeedEvil> for example - camera can do various photometrology stuff
[23:20] <SpeedEvil> measuring haze
[23:20] <Lunar_Lander> yea
[23:21] <SpeedEvil> trying to work out position of baloon optically - or conversely map the landscape
[23:21] <SpeedEvil> stars
[23:21] <Lunar_Lander> yeah
[23:21] <Lunar_Lander> I would say that meteorological sensors are mandatory for each flight
[23:33] <RocketBoy> Lunar_Lander: I'm sure you can (send 15) it all depends on how small you can make the equipment
[23:34] <RocketBoy> anyway - ttfn
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[23:35] <rjharrison> hey jcoxon
[23:36] <Lunar_Lander> yes
[23:36] <Lunar_Lander> good night
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[23:37] <jcoxon> hi rjharrison
[23:38] <rjharrison> jcoxon did you see your pm
[23:38] <jcoxon> yes
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[23:45] <juxta> hi all
[23:46] <jcoxon> hey juxta
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[23:46] <juxta> evening jcoxon :)
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[23:48] <juxta> ahh I see you're re-launching on the 20th jcoxon :D
[23:52] <jcoxon> yeah thats the plan
[23:52] <jcoxon> though will have to monitor the weather closely
[23:53] <juxta> jcoxon: is that the same launch site as last time?
[23:54] <jcoxon> no it'll be churchill
[23:54] <jcoxon> so 15km east
[23:55] Nick change: SpeedEvil1 -> SpeedEvil
[00:00] --- Thu Feb 18 2010