[00:00] <Laurenceb> thats enough to send mpeg
[00:04] <Laurenceb> hmm I'm stuck for what to use for the mini rogallo now...
[00:04] <Laurenceb> looks like it will have to be ripstop nylon
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[07:22] <jcoxon> morning all
[07:33] <gordonjcp> morning
[07:36] <jcoxon> hey gordonjcp
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[07:51] <edmoore> morning all\
[07:51] <jcoxon> hey edmoore
[07:51] <edmoore> jcoxon: weather rep
[07:51] <jcoxon> hmmmm sunday is holding
[07:52] <jcoxon> tomorrow is perfect :-P
[07:53] <jcoxon> maybe a lunch time launch on sunday
[07:53] <jcoxon> will continue to keep an eye
[08:03] <EarlJr> where you going to launch from?
[08:03] <edmoore> Churchill College, Cambridge
[08:03] <edmoore> Is the current plan, I beleive
[08:04] <EarlJr> good luck then
[08:05] <EarlJr> that is a bit far from my neck of the woods
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[12:06] <Ei5GTB> only took 24 hours but i got the furnature moved..
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[13:26] <Laurenceb> hello
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[14:00] <Laurenceb> hi edmoore
[14:00] <edmoore> y
[14:00] <edmoore> o
[14:01] <Laurenceb> tada - http://wiki.ukhas.org.uk/code:ground_control
[14:01] <Laurenceb> ground control done properly (I hope)
[14:02] <Laurenceb> annoyingly on AVR the input capture register doubles as the top count register
[14:03] <Laurenceb> but theres a way to use the compareA register to reset the timer - unfortunately I'm using compareA to drive the servo, so its going to have to be resoldered to use compareB
[14:04] <Laurenceb> you might like these: http://www.xsens.com/en/products.php
[14:08] <edmoore> Laurenceb: come across their stuff a few times
[14:08] <Laurenceb> any idea how pricey?
[14:17] <edmoore> too pricey
[14:18] <Laurenceb> lol
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[17:02] <Laurenceb> http://uk.farnell.com/atmel/atmega644p-20pu/avr-mcu-64k-flash-4k-ram-644/dp/1455122
[17:02] <Laurenceb> ^ nice
[17:08] Action: SpeedEvil stabs farnell.
[17:08] <SpeedEvil> Won't take switch.
[17:08] <SpeedEvil> Or rather, won't online.
[17:08] <Laurenceb> there site has been being a bit glitchy recently
[17:08] <Laurenceb> *their
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[17:09] <SpeedEvil> No - the 'pay now' thingy will only take credit cards.
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[17:10] <SpeedEvil> No - the 'pay now' thingy will only take credit cards.
[17:10] <SpeedEvil> http://www.tincantools.com/product.php?productid=16133&cat=0&page=1&featured - only 10 times more expensive :)
[17:10] <SpeedEvil> And DIP40
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[17:14] <Laurenceb> only 2 ADC
[17:14] <Laurenceb> :P
[17:15] <Laurenceb> the problem is its unsuitable for real time control
[17:16] <SpeedEvil> Not really.
[17:16] <Laurenceb> unless you want to load an RTOS or something
[17:16] <SpeedEvil> I'm unsure if there are RTOS patches for ARM-linux.
[17:16] <rjharrison> Laurenceb, If you wan't that chip from farnell's I could pick it up for you
[17:17] <Laurenceb> its ok thanx
[17:17] <Laurenceb> I'm going to put in a big order fairly soon
[17:17] <Laurenceb> and get free dilivery
[17:17] <SpeedEvil> And remember.
[17:17] <SpeedEvil> Spot something cheap, get it then.
[17:17] <SpeedEvil> Don't wait.
[17:17] <SpeedEvil> :/
[17:17] Action: SpeedEvil saw 40A FETs at 9p per.
[17:18] <SpeedEvil> Put 50 in shopping basket, but diddn't bother phoning up and doing the switch thing that way
[17:18] <SpeedEvil> now 1.20
[17:21] <Laurenceb> I got a brushless motor speed controller from china for £3
[17:21] <Laurenceb> a while ago
[17:21] <Laurenceb> 10A IIRC
[17:22] <SpeedEvil> yeah - but that's normal price.
[17:22] <Laurenceb> very cheap IMO
[17:23] <Laurenceb> also it was powered off an AVR, so you mighht be able to reflash it
[17:23] <Laurenceb> depends how they had locked it...
[17:28] <rjharrison> Time for home. Chat later
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[17:33] <Laurenceb> hmm someone got there before me http://home.versanet.de/~b-konze/low_cost/18a_regler.htm
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[17:37] <SpeedEvil> It seems to be encrypted in some manner :)
[17:37] <SpeedEvil> What's it?
[17:37] <Laurenceb> putting custom firmware on a cheap chinese brushless ESC
[17:44] <Laurenceb> http://www.rcgroups.com/forums/showthread.php?t=766589&page=9
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[18:49] <natrium42> hi
[18:53] <jcoxon> hey natrium42
[18:56] <natrium42> launch fever? :)
[18:56] <natrium42> how's the forecast?
[18:56] <jcoxon> hehe, still stuff to sort out
[18:56] <jcoxon> yeah the forecast is pretty good
[18:56] <jcoxon> that said saturday is improving
[18:57] <jcoxon> but i think i'll still go for sunday
[18:58] <jcoxon> it suits more people
[18:58] <jcoxon> natrium42, i've sorted the sstv image upload system
[18:59] <SpeedEvil> In international waters are tehre regulations on remote transmitters?
[18:59] <jcoxon> SpeedEvil, quite possibly not
[18:59] <SpeedEvil> Say I've a payload 30Km over the mid-atlantic forex.
[19:00] <jcoxon> that said there are international rules about radio bands etc
[19:00] <SpeedEvil> I was wondering about a few watts at 5-20MHz or so.
[19:00] <SpeedEvil> pulsed of course.
[19:00] <jcoxon> that said i don't see why not
[19:01] <natrium42> ooh
[19:01] <SpeedEvil> GPS disciplined to +-1Hz or so.
[19:01] <jcoxon> SpeedEvil, you could run by the US rules and not really worry
[19:02] <SpeedEvil> Though satellite modules aren't actually _that_ expensive.
[19:02] <jcoxon> natrium42, the only thing is that it takes the wrong gps string
[19:02] <SpeedEvil> ~$1/SMS + $150 IIRC
[19:04] <natrium42> jcoxon, eh?
[19:04] <jcoxon> well the picture is taken quite a bit before its fully transmitted
[19:05] <natrium42> ok, so once you send the picture, can't you RTTY the corresponding GPS string?
[19:05] <natrium42> or in the other order?
[19:05] <jcoxon> i guess :-)
[19:06] <natrium42> it's better to transfer picture data separately, IMO
[19:07] <natrium42> i mean, meta data
[19:07] <Laurenceb> does the sstv mind rtty?
[19:07] <Laurenceb> i.e. the reciever
[19:07] <jcoxon> Laurenceb, nah
[19:07] <jcoxon> they are quite happy
[19:09] <Laurenceb> I see
[19:10] <Laurenceb> I'm off , cya
[19:10] <jcoxon> actually MMSSTV is really good at autodetecting a sstv signal and downloading it
[19:10] <jcoxon> so i'm going to leave that in the background
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[19:12] <jcoxon> natrium42, okay sorted it
[19:12] <natrium42> ooh, that was quick
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[19:14] <jcoxon> ooo maybe not ;-)
[19:15] <jcoxon> basically getting my ground control code to grab the gps string a bit earlier and save it to be uploaded with the image
[19:15] <natrium42> did you get a big "FAIL." popup?
[19:16] <natrium42> yah, you could have some kind of flag in the GPS string
[19:16] <natrium42> signifying that it applies to the currently stored image that is going to be transmitted
[19:16] <jcoxon> yeah
[19:17] <natrium42> btw, did you have a chance to add CRC?
[19:18] <jcoxon> to the telemetry?
[19:19] <natrium42> right
[19:19] <SpeedEvil> GPS has its own checksum if you spew the whole sentance.
[19:20] <SpeedEvil> NMEA
[19:20] <jcoxon> natrium42, i didn't add a checksum, but i could do packet which does have some error correction
[19:20] <jcoxon> but i ain't changing anything!
[19:21] <natrium42> yeah, too close to launch
[19:22] <jcoxon> right now its done
[19:22] <jcoxon> its not going to be perfect but within 10 seconds of being right
[19:22] <jcoxon> and the correct string is overlayed on the image anyway
[19:22] <natrium42> excellent
[19:23] <natrium42> overlay barcode! then you can read it programatically :P
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[19:23] <rjharrison> Evening jcoxon
[19:23] <rjharrison> Evening all
[19:23] <jcoxon> hey rjharrison
[19:24] <rjharrison> You still fixing the weather
[19:24] <natrium42> actually, you can also run OCR on the string
[19:24] <jcoxon> natrium42, i've uploaded an example
[19:24] <jcoxon> to the tracker
[19:24] <jcoxon> rjharrison, oh it ain't too bad
[19:25] <jcoxon> and the forecasts have a 'land' landing
[19:25] <rjharrison> You playing with the tracker to pass your strings?
[19:25] <rjharrison> haha
[19:25] <rjharrison> Goo
[19:25] <rjharrison> d
[19:25] <jcoxon> just sorting out my ground software
[19:26] <jcoxon> i'm pretty much ready
[19:26] <rjharrison> I would like to test the treacker with my chase car kit
[19:26] <jcoxon> just need to get some more credit on the phone
[19:26] <jcoxon> rjharrison, which tracker, your tracker or spacenear.us
[19:26] <rjharrison> Well I guess you are going to use spacenear us
[19:26] <jcoxon> yeah
[19:27] <rjharrison> So I guess a quick check with that would be good
[19:27] <rjharrison> can you pm me a password
[19:28] <rjharrison> or indeed a sample url and I'll give it a quick test
[19:37] <natrium42> bbl, lecture
[19:37] <natrium42> jcoxon, picture looks good
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[20:08] <Xenion> Guten Abend alle miteinander :-)
[20:09] <Xenion> good evening folks :-)
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[21:50] <Laurenceb> hello
[21:51] <Hiena> http://cgi.ebay.com/Tektronix-2430-150MHz-2ch-Digital-Oscilloscope_W0QQitemZ220300211498QQcmdZViewItem?hash=item220300211498&_trkparms=72%3A1205|39%3A1|66%3A2|65%3A12|240%3A1318&_trksid=p3286.c0.m14
[21:52] <Hiena> Damn, it's a good scope for a nothing...
[21:52] <Laurenceb> nice
[21:52] <Laurenceb> hmm can I afford it
[21:53] <Hiena> Yeah, sad, but i'm too far away to bid it. Not ot mention, i have no e-bank account.
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[22:15] <Laurenceb> wow
[22:15] <Laurenceb> -Os -mcall-prologues
[22:15] <Laurenceb> shaves about 5% off code size with gcc
[22:15] <Laurenceb> compared to -Os
[22:16] <Laurenceb> hi ed
[22:17] <Hiena> Laurenceb, how about the speed?
[22:17] <Laurenceb> yeah
[22:17] <Laurenceb> I'm just reading up on it
[22:18] <Laurenceb> seems to be equivalent to -O2
[22:18] <Laurenceb> wrt time
[22:19] <Laurenceb> -Os is a bit faster
[22:19] <Laurenceb> -O3 is a lot faster, but huge code size
[22:19] <Laurenceb> but with most of the examples the speed loss is <1%
[22:20] <Laurenceb> compared to -Os
[22:21] <Laurenceb> this is insane my code is 14.75KB with ground control and eeprom datalogging support
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[23:03] <SpeedEvil> Laurenceb: examine the output code, and see if you can find any major sillies.
[23:04] <SpeedEvil> Laurenceb: I did a lot of that when I was doing SHA in 512 bytes (i386)
[23:04] <SpeedEvil> Ended up as the easiest way to do it small was to do a teeny virtual machine.
[23:05] <SpeedEvil> e-bank account?
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[00:00] --- Fri Oct 31 2008