highaltitude.log.20080208

[00:06] <jcoxon> groovy, it all works
[00:07] <natrium42> excellent
[00:08] <jcoxon> just going to take some more pics
[00:12] <jcoxon> done
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[00:15] <gerard_mp> hello?
[00:15] <natrium42> hi
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[00:17] <gerard_mp> hi!
[00:17] <natrium42> jcoxon, the switch could be a problem if it hits it somehow on landing :P
[00:17] <gerard_mp> are you the author of halo2?
[00:17] <natrium42> yes
[00:17] <gerard_mp> I've just written a comment on your page
[00:18] <gerard_mp> I'm preparing a balloon, but I0m unsure of what comm. mode to use
[00:18] <jcoxon> natrium42, yeah, i'll tape it in place
[00:18] <jcoxon> but also teh switch won't turn off the radio which keep pulsing
[00:18] <edmoore> hi gerard_mp
[00:18] <gerard_mp> did you have good experience with xtend rf modems?
[00:19] <gerard_mp> hello edmoore!
[00:19] <natrium42> gerard_mp, i did have contact up to an altitude of 6km and downrange of 12km or so
[00:19] <natrium42> but that was with omnidirectional antenna on the ground... gotta use a directional one next time
[00:20] <gerard_mp> but u are saying on the ground right?
[00:20] <gerard_mp> did u use the default antenna on the balloon?
[00:21] <jcoxon> gerard_mp, check out this: http://wiki.ukhas.org.uk/ideas:communication
[00:21] <jcoxon> we've got 300km range with very simple 10mW radios
[00:21] <gerard_mp> :O!
[00:21] <gerard_mp> let me check
[00:22] <gerard_mp> are they expensive to build?
[00:22] <edmoore> $30?
[00:23] <gerard_mp> so cheap
[00:23] <jcoxon> there is a little bit of a knack to them
[00:23] <jcoxon> and they won't have the bandwidth of teh rf modems
[00:24] <edmoore> yes, it's very much a case of polishing a turd
[00:24] <edmoore> if you're not limited to 10mW, then go bigger
[00:24] <gerard_mp> the main problem of made rf modems is their price, and they use 900mhz used by mobiles here
[00:25] <gerard_mp> (in the case of xtend)
[00:26] <jcoxon> gerard_mp, where are you based?
[00:26] <gerard_mp> spain
[00:26] <jcoxon> looking into the local laws about airbourne radio
[00:27] <jcoxon> there is a whole range of laws depending on the country
[00:27] <jcoxon> e.g. the UK are very restrictive, the US are less restrictive
[00:28] <gerard_mp> yes, right
[00:29] <gerard_mp> I'm a bit unsure of making a radio transmitter myself. I've been working for many time in electronics, but never in radio comms.
[00:29] <jcoxon> edmoore, any news on the antenna
[00:29] <jcoxon> gerard_mp, well the transmitter is actually bought
[00:29] <edmoore> nope. will ask him tomorrow
[00:29] <jcoxon> its how you feed the data to the module that gets teh range
[00:29] <jcoxon> edmoore, okay, well rocketboy has a spare if necessary (well more a wire with the right connector)
[00:30] <gerard_mp> so what goes between transmitter and data? a microcontroller such PIC or AVR?
[00:30] <jcoxon> yup
[00:30] <jcoxon> the person to talk to is Rocketboy (he was on earlier)
[00:30] <jcoxon> he would probably be happy to send you a PIC with the preprogrammed code
[00:31] <jcoxon> maybe for a little fee
[00:31] <natrium42> yeah, that's for the ground antenna
[00:31] <natrium42> the antenna on the payload was just a 1/2 wave antenna
[00:32] <gerard_mp> thanks both, jcoxon and natrium42
[00:32] <jcoxon> no problem :-)
[00:33] <jcoxon> edmoore, http://www.pegasushabproject.org.uk/wiki/doku.php/missions:firefly:fhalp-2
[00:33] <edmoore> itty bitty!
[00:33] <jcoxon> indeedy
[00:34] <natrium42> sure thing
[00:34] <natrium42> lol
[00:34] <gerard_mp> I'll try to look a bit more and decide what to do :)
[00:35] <jcoxon> have a look at wiki.ukhas.org.uk, lots of good info
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[00:36] <gerard_mp> I'll try to ask rocketboy for his 'module', price etc.
[00:37] <jcoxon> cool
[00:37] <jcoxon> nice to chat
[00:37] <jcoxon> night all
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[00:38] <gerard_mp> natrium42: are u planning to release a 3rd flight?
[00:58] <gerard_mp> well, thanks for all! Nice to chat
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[08:26] <jcoxon> morning edmoore
[08:26] <edmoore> ello
[08:26] <edmoore> calling ferh now!
[08:26] <edmoore> ferg*
[08:27] <jcoxon> :-) , no hurry
[08:27] <edmoore> ferg says yep fine
[08:28] <jcoxon> cool, what exactly is hte antenna?
[08:28] <edmoore> this one http://www.sparkfun.com/commerce/product_info.php?products_id=290
[08:28] <jcoxon> so i can accomadate it
[08:29] <jcoxon> do you have the adaptor as well?
[08:29] <jcoxon> as thats an sma connector
[08:29] <edmoore> no
[08:29] <jcoxon> hmmmmm
[08:31] <jcoxon> poo
[08:31] <edmoore> i wonder where one can get one at short notice
[08:31] <edmoore> what is the one on the gsm end?
[08:32] <jcoxon> its a mmcx
[08:32] <jcoxon> Rocketboy has an mmcx with some coax
[08:32] <jcoxon> and he's fashioned it into an antenna
[08:33] <jcoxon> so I could use that
[08:35] <edmoore> you might be able to source an adaptor...
[08:36] <jcoxon> but also there is 3m of cable on that antenna
[08:36] <jcoxon> probably double the weight!
[08:36] <edmoore> yes it is a bit ridiculous!
[08:36] <jcoxon> lets go with rocketboy's antenna
[08:37] <jcoxon> i'm actually logging reception through the flight
[08:37] <jcoxon> it'll be interesting to see how it varies
[08:37] <jcoxon> i want to know if it reports reception to be good or bad at altitude
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[08:37] <jcoxon> cause i could then use it to control the sms
[08:37] <jcoxon> as in only bother to send an sms if there actually is reception
[08:42] <edmoore> ferg would like to come along, if that's ok
[08:43] <edmoore> whame about the camera - is it just a question of plugging it in?
[08:43] <jcoxon> of course
[08:43] <jcoxon> there is no camera
[08:43] <edmoore> i thought you said you weren't using it is it was just another thing to go wrong...
[08:44] <jcoxon> oh
[08:44] <edmoore> amazing jet stream conditions!
[08:44] <jcoxon> whame - shame
[08:44] <jcoxon> yeah
[08:44] <edmoore> james stick it on a 1.2 and get the record :p
[08:44] <jcoxon> but i won't have gps
[08:44] <edmoore> we can extrapolate
[08:45] <jcoxon> and i'm not sure i trust my reset code
[08:45] <edmoore> lol, ok
[08:45] <edmoore> nvm
[08:45] <jcoxon> damn you
[08:45] <jcoxon> don't tempt me
[08:45] <edmoore> well you don't have a camera, so the interweb won't care :)
[08:45] <jcoxon> hehe
[08:46] <jcoxon> exactly
[08:46] <jcoxon> the camera is bigger then the payload
[08:46] <jcoxon> i mean it is ready
[08:46] <jcoxon> but this is to test the system so that I can start doing cooler things with it
[08:46] <edmoore> we really need to find a nice camera that is light
[08:46] <jcoxon> i've actually got an olympus
[08:46] <jcoxon> one of the good ones
[08:46] <edmoore> good glass and 5mpx, wide angle, and not much else
[08:46] <jcoxon> all rigged up
[08:47] <edmoore> oh well
[08:47] <jcoxon> but they aren't light
[08:47] <edmoore> next time
[08:47] <edmoore> yeah
[08:47] <jcoxon> exactly
[08:47] <jcoxon> my theory was that either i get this back of lose it, if i get it back i can fly it again
[08:47] <jcoxon> of -> or
[08:48] <jcoxon> hmmm parachutes - do you have any small ones?
[08:48] <edmoore> arse, i could have done
[08:48] <edmoore> they're all at home though
[08:49] <jcoxon> i'll make one
[08:50] <edmoore> i hear blue-tack works for securing chutes
[08:51] <jcoxon> sweet
[08:51] <jcoxon> how about testing streamers?
[08:52] <edmoore> it might have to be quite big, but that would be awesome
[08:53] <jcoxon> http://wiki.ukhas.org.uk/guides:parachute_sizing_chart
[08:55] <edmoore> what's the width?
[08:57] <jcoxon> its a 10:1 ratio apparently
[08:57] <jcoxon> well it assumes a 10:1
[08:59] <jcoxon> well i'm going shopping later - i shall see what i can find
[09:00] <edmoore> http://www.polystyreneballs.com/cut-ball-info.asp
[09:00] <edmoore> my payload!
[09:01] <jcoxon> amazing
[09:01] <jcoxon> do it
[09:02] <edmoore> at least it would float :p
[09:02] <jcoxon> indeed it would
[09:02] <jcoxon> i've got some badass black and yellow stripped tape
[09:02] <edmoore> haha
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[09:13] <edmoore> have replied
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[09:15] <jcoxon> i'm ashamed that i forgot the sausage roles
[09:15] <jcoxon> rolls*
[09:16] <edmoore> I know
[09:16] <edmoore> christ
[09:16] <edmoore> you've done this enough times
[09:16] <edmoore> pull yourself together man
[09:16] <jcoxon> well we had mince pies last time didn't we
[09:16] <edmoore> ha, so we did
[09:16] <edmoore> but that was seasonal
[09:16] <jcoxon> pancakes?
[09:17] <jcoxon> this will be ukhas' 18th launch
[09:17] <edmoore> coming of age
[09:17] <jcoxon> and my 7th
[09:17] <edmoore> we'll get a picnic going
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[09:18] <jcoxon> i'm on a 1:1 ratio
[09:18] <jcoxon> of success and loss
[09:18] <jcoxon> not good
[09:19] #highaltitude: mode change '+o jcoxon' by ChanServ!ChanServ@services.
[09:19] <edmoore> this will make you a majority success, i predict
[09:19] <edmoore> which is all that matters
[09:20] <edmoore> do you know what the non-standard rocket launch steve was referring to is?
[09:20] Topic changed on #highaltitude by jcoxon!n=jcoxon@host86-129-62-157.range86-129.btcentralplus.com: Welcome to #highaltitude - discuss anything to do with high altitude projects (balloons, gliders, etc) www.ukhas.org.uk, wiki.ukhas.org.uk, logs: http://users.gridstar.net/~zeusbot/ ,Firefly Launch: 10/02/08, 1100GMT
[09:21] <jcoxon> no but it should be interesting
[09:22] <edmoore> yes
[09:22] Topic changed on #highaltitude by jcoxon!n=jcoxon@host86-129-62-157.range86-129.btcentralplus.com: Welcome to #highaltitude - discuss anything to do with high altitude projects (balloons, gliders, etc) www.ukhas.org.uk, wiki.ukhas.org.uk, logs: http://users.gridstar.net/~zeusbot/, Firefly Launch: 10/02/08, 1100GMT
[09:22] <edmoore> I'm looking forward to it
[09:22] <edmoore> are you going to come up for our ZP launch when it finally happens?
[09:23] <jcoxon> oh definitely
[09:23] <jcoxon> i love launch zero pressures
[09:23] <edmoore> I'm sure your experience would be of great help
[09:24] <jcoxon> haha, i'm sure they are different
[09:24] <jcoxon> i used to get lifted off the ground when i was doing them
[09:25] <edmoore> lol
[09:27] <jcoxon> depends on whether you are happy with skin contact with the envelope
[09:28] <jcoxon> they had this clever way of unwrapping them which allowed you to release it at the last minute
[09:28] <edmoore> I'm worried about holes in it atm
[09:28] <edmoore> it seems to collect them
[09:29] <jcoxon> they are quite delicate
[09:29] <edmoore> yeah
[09:29] <edmoore> one of these might make a great payload case
[09:29] <edmoore> http://peli.com/cases_detail.php?Case=1010
[09:30] <edmoore> and waterproof, with built in pressure equalisation seal
[09:33] <edmoore> solves the issue of waterproof cases exploding at high altitude
[09:34] <jcoxon> its not going to bounce though
[09:34] <edmoore> this is true
[09:34] <jcoxon> for a 434mhz antenna
[09:34] <jcoxon> i need it to be 1/4 wave don't it
[09:35] <edmoore> think so, yep
[09:35] <jcoxon> so 17.5cms
[09:41] <jcoxon> cool, just have enough wire
[09:41] <edmoore> :)
[09:42] <jcoxon> and found some coax to run from the module to the actual antenna
[09:46] <jcoxon> edmoore, with the FET fired cutdown the wires don't need to be thick
[09:46] <jcoxon> ?
[09:46] <edmoore> correct
[09:46] <edmoore> cos they just charge the cap
[09:47] <jcoxon> cause i've got some small wire
[09:47] <jcoxon> was wondering if it was suitable
[09:48] <edmoore> should be
[10:11] <edmoore> jcoxon: anything else I can do for Sunday?
[10:11] <jcoxon> ummmmm
[10:11] <jcoxon> i'm not sure
[10:11] <jcoxon> can you think of anything?
[10:11] <jcoxon> anything you want to test?
[10:15] <edmoore> not yet
[10:15] <edmoore> flight computer isn't yet ready
[10:15] <jcoxon> any silly experiment?
[10:15] <edmoore> Will want to piggyback at some point tho
[10:15] <jcoxon> thats the whole point of firefly :-)
[10:15] <edmoore> spaceport?
[10:16] <jcoxon> yup
[10:20] <jcoxon> it'll have to go train
[10:24] <jcoxon> right radio antenna made
[10:26] <edmoore> coolio
[10:26] <edmoore> right, breakfast
[10:26] <edmoore> cya later!
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[11:11] <Laurenceb> hey folks
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[11:30] <Laurenceb> hi ed
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[12:16] <edmoore> hi Laurenceb
[12:23] <Laurenceb> hey ed
[12:24] <Laurenceb> I've put some photos of the ioniser on the wiki
[12:25] <Laurenceb> hmm think I screwed my sound card, reboot time
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[13:04] <Laurenceb> hello
[13:04] <Laurenceb> I seem to have fldigi working
[13:04] <Laurenceb> needed to calibrate my soundcard
[13:04] <Laurenceb> it uses the sample rate to setup to time base
[13:05] <Laurenceb> and its off by several % (probably due to my cheap sound card)
[13:19] <Laurenceb> the afc seems to work very well, unlike truetty
[13:19] <Laurenceb> and it can talk to the icom scanner directly, retuning it using the afc :P
[13:30] <Laurenceb> best of all you can control it from the command line, so it could be comtrolled by a python script that also runs google earth and the decoding
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[14:14] <Laurenceb> ok packets come through with the rx and tx both wrapped in foil :D
[14:14] <edmoore> lol
[14:14] <Laurenceb> the signal is very close to the noise floor
[14:15] <Laurenceb> I'd say its about as low as we get when the payload is near the ground 30Km away or so
[14:16] <Laurenceb> annoyingly my frequency meter is less accurate than my laptop sound card
[14:16] <edmoore> :s
[14:16] <Laurenceb> seems to be an error of about 2.5% on my laptop, but I need to be sure
[14:16] <Laurenceb> need to know the error to +- 0.1% ideally
[14:17] <Laurenceb> then if I tune my laptop perfectly, we have maximum flexibility for the tx crystal to wander
[14:18] <Laurenceb> hopefully +-2% if I set it up carefully
[14:19] <Laurenceb> right time for some late lunch
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[15:45] <edmoore_> hi jcoxon
[15:45] Nick change: edmoore_ -> edmoore
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[15:47] <laurence_> jcoxon: you about?
[15:47] <laurence_> how the $%^& do you write to gpio?
[15:47] <laurence_> I cant get it to work grrrrr
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[16:19] <jcoxon> hey Laurenceb
[16:19] <jcoxon> depends on your system!
[16:19] <jcoxon> hey edmoore
[16:20] <Laurenceb> arg this is really annoying
[16:20] <Laurenceb> just the gpio test commands fail
[16:20] <Laurenceb> the example code does nothing
[16:21] <jcoxon> how are you meant to be doing it?
[16:21] <Laurenceb> echo -ne "/x00/x00/x00/x00" > /dev/gpio1
[16:21] <Laurenceb> echo -ne "/x00/x08/x00/x00" > /dev/gpio1
[16:21] <Laurenceb> and so on
[16:21] <jcoxon> and what error do you get?
[16:21] <Laurenceb> none
[16:22] <Laurenceb> but the led doesnt turn on
[16:22] <jcoxon> is there are kernel module that needs to be loaded?
[16:22] <Laurenceb> it worked before
[16:22] <jcoxon> does /dev/gpio1 exist?
[16:22] <Laurenceb> when I was using serial
[16:22] <Laurenceb> yes
[16:22] <jcoxon> when you were using serial?
[16:23] <Laurenceb> yes
[16:23] <Laurenceb> now I'm using ssh
[16:23] <jcoxon> should be no difference?
[16:24] <Laurenceb> maybe not
[16:24] <jcoxon> scratch the '?'
[16:24] <Laurenceb> for example python doesnt work with ssh
[16:24] <Laurenceb> as the path is different
[16:24] <jcoxon> you haven't set up ssh then properly
[16:24] <Laurenceb> right
[16:24] <jcoxon> are the permissions good for writing to /dev/gpio1?
[16:24] <edmoore> hi jcoxon
[16:25] <Laurenceb> dont know
[16:25] <Laurenceb> how do I check?
[16:25] <jcoxon> do 'chmod 777 /dev/gpio1'
[16:25] <jcoxon> then check
[16:25] <jcoxon> that'll make it full permissions
[16:25] <Laurenceb> ok
[16:26] <Laurenceb> right, bbl, only have one network jack on here
[16:26] <Laurenceb> thanx
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[16:57] <jcoxon> natrium42, you around?
[16:57] <natrium42> yep
[16:57] <natrium42> sup?
[16:58] <jcoxon> last minute tests
[16:58] <jcoxon> the module isn't accepting a sim card
[16:58] <jcoxon> any ideas?
[16:58] <natrium42> poor contact?
[16:59] <jcoxon> what i'm worrying about
[16:59] <jcoxon> is it possible to pop the lid?
[16:59] <natrium42> yes
[16:59] <jcoxon> any precautions?
[16:59] <jcoxon> (apart from disconnecting it :-)
[16:59] <natrium42> nope, just use an xacto knife or flat screw driver
[17:00] <natrium42> did this module work for you before, though?
[17:00] <natrium42> there's a software option to switch between networks
[17:00] <natrium42> i set it to canadian one
[17:00] <natrium42> i think 1900MHz was it...
[17:01] <jcoxon> its reporting that there is no sim card
[17:01] <jcoxon> i haven't checked the networks
[17:01] <jcoxon> s
[17:02] <jcoxon> i actually haven't tried it before with a simcard
[17:02] <jcoxon> sort of assumed it was working :(
[17:02] <jcoxon> silly me
[17:04] <natrium42> hmm, lets see
[17:05] <natrium42> #May be required in North America / Canada to switch the unit to 900/1900MHz frequency (uncomment if in those areas)
[17:05] <natrium42> MDM.send('AT#BND=3\r', 0)
[17:05] <natrium42> MDM.receive(1)#0.1sec
[17:05] <natrium42> MOD.sleep(1)#wait 0.1sec
[17:06] <jcoxon> funny that command isn't in the manual
[17:06] <natrium42> indeed
[17:07] <natrium42> i found it in the forums
[17:07] <jcoxon> so change to?
[17:07] <natrium42> btw, what does AT+CPIN? return?
[17:07] <jcoxon> +CME ERROR: SIM not inserted
[17:07] <jcoxon> yes its defintely there
[17:07] <jcoxon> , just tried with my normal sim card (though same network)
[17:08] <natrium42> try BND=1
[17:08] <jcoxon> then restart the module?
[17:09] <natrium42> hmm
[17:09] <natrium42> not sure
[17:09] <jcoxon> well without cpin still returns the same error
[17:10] <natrium42> so have you eliminated poor contact?
[17:10] <natrium42> reinsert the sim multiple times
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[17:11] <jcoxon> contacts look good
[17:11] <natrium42> what does AT+CREG? say?
[17:12] <jcoxon> +CREG: 0,2 OK
[17:13] <natrium42> so that's good
[17:13] <natrium42> Mobile is currently not
[17:13] <natrium42> registered on any network but is
[17:13] <natrium42> looking for a suitable one to
[17:13] <natrium42> register.
[17:14] <jcoxon> now
[17:14] <jcoxon> i don't have an antenna right now
[17:14] <jcoxon> but i still would assume it would detect the sim card
[17:15] <natrium42> yeah, i don't remember doing any SIM operations
[17:16] <jcoxon> http://www.edaboard.com/ftopic110924.html
[17:16] <natrium42> aah
[17:16] <natrium42> so it can be an antenna problem?
[17:17] <jcoxon> apparently
[17:17] <natrium42> btw, can your battery supply enough current?
[17:17] <jcoxon> its a lipo
[17:17] <jcoxon> yeah i should
[17:17] <natrium42> you said 2000 mAh lipo
[17:17] <jcoxon> yeah
[17:17] <jcoxon> apparently its suitable
[17:18] <natrium42> right, so should be good
[17:19] <jcoxon> so i guess its a matter of getting an antenna
[17:19] <jcoxon> which i'm going to get hold of on sunday :-p
[17:19] <natrium42> let's hope that :)
[17:19] <jcoxon> i haven't changed the code since 1 so i know it'll work
[17:20] <natrium42> don't launch it before you do! :P
[17:20] <jcoxon> what i do have is an 868mhz antenna
[17:21] <jcoxon> to test that is
[17:21] <natrium42> might work
[17:21] <natrium42> even a simple wire might work
[17:21] <natrium42> unshielded of course :)
[17:23] <jcoxon> ooo new error
[17:23] <jcoxon> nope
[17:23] <jcoxon> same one
[17:23] <jcoxon> oops
[17:24] <jcoxon> but CREG give 0,3
[17:25] <natrium42> Mobile has found some
[17:25] <natrium42> networks but it is not allowed to
[17:25] <natrium42> register on any of them, no
[17:25] <natrium42> roaming was allowed.
[17:27] <jcoxon> hmmmm
[17:28] <natrium42> what does AT+CSQ say?
[17:29] <jcoxon> 99,99]
[17:29] <natrium42> so no network detected
[17:29] <natrium42> also "f the antenna is mismatched and/or it has high VSWR, will cause high currents being consumed from the power supply, during TX pulses. If your power supply is not powerfull enough, this pulses will cause voltage drops below minimum operating value, and this can dazzle the logic part, causing strange behaviour."
[17:30] <jcoxon> so charge my lipo
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[17:31] <Laurenceb> hello
[17:31] <Laurenceb> couldnt get the gpio working :(
[17:31] <jcoxon> natrium42, the sim card defintely works
[17:32] <Laurenceb> IIRC when I had it working before, that was before I upgraded linux
[17:33] <Laurenceb> and it might be a bit more complicated now, there is leda and ledb in /config
[17:33] <Laurenceb> and enable is set to 0
[17:33] <Laurenceb> unfortunately I've left the board at the lab over the weekend, so it will have to wait until monday
[17:34] <Laurenceb> it might have to be done with a little c program, looking at some of the forum posts
[17:35] <Laurenceb> jcoxon: how do you normally do gpio?
[17:35] <jcoxon> it really varies
[17:35] <jcoxon> on the gumstix there was a kernel module that added some stuff to /proc
[17:35] <jcoxon> which you then echo commands to
[17:35] <Laurenceb> ah ok...
[17:36] <Laurenceb> I have /dev/gpio0 1 2 and so on
[17:36] <Laurenceb> but nothing seems to happenwhen they are written to
[17:36] <jcoxon> right i have to dash
[17:36] <Laurenceb> cya
[17:36] <jcoxon> natrium42, i'll let the battery charge
[17:37] <Laurenceb> reading the documentation, it seems all they were were leds
[17:37] <Laurenceb> so gpio1 is leda
[17:37] <Laurenceb> and i think its a kernel module
[17:37] <Laurenceb> but I really dont know enough about this stuff
[17:38] <Laurenceb> so in other words, gpio1 isnt a port, its just a single pin
[17:39] <Laurenceb> I've found a few python programs that might do it...
[17:40] <Laurenceb> but they only seem to be able to talk to the leds, which have been configured at a lower level... I think c code is needed but I dont have enough experience...
[17:45] Hiena (n=Hiena@81.93.195.181.datatrans.hu) joined #highaltitude.
[17:45] <Hiena> Good evening!
[17:45] <Laurenceb> hello
[17:46] <Laurenceb> do you have any linux experience?
[17:48] <Hiena> 10 years.
[17:49] <Hiena> Not so much. ;)
[17:49] <Hiena> What is the problem?
[17:50] <Laurenceb> I need to talk to gpio
[17:50] <Laurenceb> on my ngw100, its a little over my head...
[17:53] <Laurenceb> e.g. do I need to recompile the kernel?
[17:53] <Laurenceb> or is it possible to access the pins from a c program
[17:55] <Hiena> Ugh...Ok. Lets start from the basics. Do you want to access to somekind of gpio pins and using some user level code, isn't it?
[17:56] <Hiena> These pins is default gpio pins of your board?
[17:56] <Laurenceb> I want to access gpio pins from user level code
[17:57] <Laurenceb> but I'm not sure if they are default gpio pins
[17:57] <Laurenceb> they can be used as gpio
[17:57] <Hiena> At first check the kernel, is this pins is supported with somekid of kernel modules or not.
[17:57] <Laurenceb> right
[17:58] <Laurenceb> so it needs a kernel module to be usable as gpio?
[17:58] <Hiena> Yup. It will make a standart interface betwen the pins and your user level codes.
[17:59] <Laurenceb> there is /dev/gpio1 and /dev/gpio2, I thought there were registers
[17:59] <Laurenceb> but it appears these are leds on the board
[17:59] <Laurenceb> so this is beginning to make sense
[18:00] <Laurenceb> so /dev/gpio1 and 2 are supported by kernel modules?
[18:00] <Laurenceb> and they are pins not ports
[18:01] <Hiena> Yes. These are the access points to your LED pins. When you reads or writes these "files", you are acessing to the LED through the kernel.
[18:01] <Laurenceb> ok
[18:01] <Laurenceb> they dont work :(
[18:01] <Laurenceb> but I think thats due to the new kernel I installed
[18:02] <Laurenceb> its more complicated, you have to enable leda and ledb in /config
[18:02] <Laurenceb> but thats done with script
[18:02] <Hiena> Could you give me a link to your kernel source? It's kind of hard to help if i don't know, what kind of kernel you have.
[18:03] <Laurenceb> ok give me 5
[18:03] <Laurenceb> thanx for the help... I'm starting to understand this
[18:04] <Hiena> Also, i'm damned hungry, so could we wait until i get some meat?
[18:05] <Laurenceb> http://avr32linux.org/twiki/pub/Main/LinuxPatches/linux-2.6.23.atmel.1.tar.bz2
[18:05] <Laurenceb> lol ok
[18:08] <natrium42> Hiena, well, you are from hungry
[18:08] <natrium42> i mean, hungary :P
[18:09] <Laurenceb> done to 7ma :P
[18:10] <Laurenceb> the power saving works
[18:11] <Laurenceb> 26ma full power, 7 ma sleeping
[18:22] <Hiena> natrium42, i would be a very-very rich man, if i got a dollar when i hear such jokes. ;)
[18:25] <natrium42> Hiena, hehehe
[18:29] <Laurenceb> cool, at least the radio works
[18:29] <Laurenceb> we might do a test next week, send someone off with the tx on a bike, and check the range
[18:33] <Laurenceb> Hiena: did you look at that kernel?
[18:34] <Hiena> Hold on. I'm melting some candle, running fluid analysis, talking with my girlfriend, cooking some cofee, and looking your kernel at the same time.
[18:34] <Laurenceb> hehe thanx
[18:35] <Laurenceb> melting candle??
[18:38] <natrium42> he's hungarian, it doesn't have to make sense XD
[18:39] <Hiena> For the stearin. It's a release agent for the aluminium casting.
[18:39] <Laurenceb> cool
[18:40] <natrium42> aah, that does make sense
[18:40] <natrium42> what are you going to cast?
[18:41] <Laurenceb> I'm really pleased with the radio, it seems all the problems were all caused by the crystal on my sound card being 2.5% off
[18:41] <Laurenceb> looks like it will work perfectly now
[18:41] <Hiena> Some parts for my car's cooling system.
[18:42] MetaMorfoziS (n=khmhm@3e44a429.adsl.enternet.hu) left irc: "Most akkor mit csinalt aki miert lepett ki?"
[18:42] <Laurenceb> nice :D
[18:42] <Laurenceb> http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&p=320938
[18:42] <Laurenceb> "The source for this configfs interface is in arch/avr32/mach-at32ap/pio.c. "
[18:42] <Laurenceb> looks like a kernel recompile is needed
[18:43] <Hiena> Laurenceb, your kernel is still downloading.
[18:43] <Laurenceb> hehe thanx for taking a look for me :P
[18:44] <Laurenceb> if I stick attenuators on my radio, will that be an accurate way to test the range?
[18:44] <Laurenceb> e.g. it the tx is only 200meters away, and there is a lot of attenuation, is that sufficinet to simulate say 20Km ?
[18:45] <Laurenceb> or is in necessary to consider rf leaking through?
[18:46] <Laurenceb> e.g. rf pickup leaking into the scanner
[18:50] <Hiena> If you could grab a RF gradient meter you could estimate with a simple calculation. At first you have set your receiver to a few hundred meter from your transmitter. Adjust the transmitter output level until the signal is lost on the receiver side. Measure the RF gradient. Now adjust your transmitter to full blast, and measure the RF gradient.
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[18:52] <Laurenceb> the tx output is not adjustable
[18:52] <Laurenceb> its fixed at 10mw
[18:54] <Hiena> And if i grab my Carl Rothammel: Antenna book, i could say the calculation for the distance...
[18:56] <Hiena> You could attenuate the output level, if you connect a 75 Ohm potenciometer between the antenna out and the ground, and connect the antenna to the moving part of the potenciometer.
[18:57] <Hiena> It not will be perfect, but it will be enough for an estimate.
[18:57] <Laurenceb> ok
[18:57] <Laurenceb> I was planning on using attenuators at the rx end
[18:57] <Hiena> Also, the 10 mW means only a few hundred meter on the ground level, and 1 or 2 km in the air.
[18:58] <Laurenceb> it can go up to 300km or so
[18:58] <Laurenceb> we've done it before
[18:58] <Hiena> What kind of frequency?
[18:59] <Laurenceb> 434MHz
[18:59] <Hiena> What kind of receiver do you have? What kind of antenna?
[19:00] <Laurenceb> icom scanner with a yagi
[19:00] <Laurenceb> http://wiki.ukhas.org.uk/projects:aerosol
[19:01] <Hiena> How many element Yagi?
[19:02] <Laurenceb> http://www.srcf.ucam.org/~cuspaceflight/nova1selected/target29.html
[19:04] <Hiena> Ah, a long one.
[19:07] <Hiena> Well, i can't help that case. I'm familiar with a radial dipoles, and a VHF technology, but i have no information about these new gadgets..
[19:07] <Laurenceb> I'm reading this: http://www.avrfreaks.net/wiki/index.php/Documentation:NGW/NGW100_Switched_Input
[19:08] <Hiena> Uhum...
[19:09] <Hiena> Well, looks like a common embedded linux.
[19:09] <Laurenceb> ok...
[19:10] <Laurenceb> so the fact that enabled was 0 for leda and ledb meant that they were not active?
[19:10] <Hiena> Yup.
[19:11] <Laurenceb> ok this isnt looking to hard
[19:11] <Laurenceb> right, i'll work on the python script this weekend
[19:11] <Hiena> You could configure the pins through the /config directory.
[19:12] <Laurenceb> yes
[19:12] <Laurenceb> http://wiki.ukhas.org.uk/projects:aerosol_code
[19:12] <Hiena> After that if you enables the pins, You could simply read and write it.
[19:12] <Laurenceb> yes
[19:12] <Laurenceb> right time for some food
[19:12] <Laurenceb> bbl, thanx for the help
[19:12] <Hiena> Bon apetite!
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[19:54] <Simon-MPFH> Scary time - just received a Kodak C743 from eBay - now to dismantle it and solder some new control lines...
[20:14] <Laurenceb> easy :p
[20:16] <Simon-MPFH> Well, it's in bits!
[20:17] <Simon-MPFH> Now I need a microscope and a soldering iron with a *very* fine tip
[20:17] <natrium42> hehe
[20:19] <Laurenceb> hmm I think I understand how to use gpio finally
[20:19] <Laurenceb> I thought i'd fried it earlier!
[20:20] <Laurenceb> in hindsignt the whole board would have died in that case, as gpios are used for some of the onboard hardware
[20:20] <natrium42> which board are you using?
[20:20] <Laurenceb> ngw100
[20:20] <natrium42> \i see
[20:21] <natrium42> looks nice
[20:21] <Laurenceb> what does "cat" do?
[20:21] Action: Simon-MPFH thinks ultra fine soldering best done *before* beer
[20:21] <Laurenceb> hehe
[20:22] <Laurenceb> Simon-MPFH: check the voltage levels very carefully before doing anything, dont want to damage your camera
[20:22] <Laurenceb> http://www.avrfreaks.net/wiki/index.php/Documentation:NGW/NGW100_Switched_Input
[20:22] <natrium42> Laurenceb, man cat
[20:22] <Simon-MPFH> Mmmmm, sound advice
[20:23] Action: Laurenceb is presently running xp
[20:23] <Simon-MPFH> Laurenceb - purrs mostly
[20:23] <Laurenceb> hehe
[20:23] <Simon-MPFH> http://mesha.mpfh.co.uk - live - with camera bits!
[20:23] <natrium42> you can use it to copy files to stdout
[20:23] <natrium42> haha
[20:23] <natrium42> excellent
[20:24] <natrium42> is the cat going to do the soldering?
[20:24] <Simon-MPFH> I wish she could solder...
[20:24] <Simon-MPFH> look what she's got now - bumstix!
[20:24] <natrium42> huhu :P
[20:24] <natrium42> now solder the buttons
[20:24] <natrium42> LIVE
[20:25] <Simon-MPFH> And radio
[20:25] <natrium42> :)
[20:25] <Laurenceb> haha
[20:25] <Laurenceb> live?
[20:26] <Simon-MPFH> Yep - purring
[20:26] <Laurenceb> watch she doesnt step on it
[20:26] <Simon-MPFH> Aye
[20:26] <Laurenceb> also static :S
[20:26] <natrium42> cats create static :P
[20:27] <Simon-MPFH> Yes, I hear the crackle on my Snom phone when I stroke her
[20:27] <Simon-MPFH> Most electronics seems fairly robust these days
[20:27] <Simon-MPFH> Haven't lost a mobo for years
[20:27] <Laurenceb> owwwww
[20:27] <Simon-MPFH> Got an earth strap on the desk though
[20:27] <Laurenceb> I would keep unprotected pcbs away
[20:29] <Laurenceb> anyway, I'm trying to understand "cat /dev/gpio3"
[20:29] <Simon-MPFH> In simple terms cat displays the contents of a file on the screen
[20:29] <Laurenceb> ah ok
[20:29] <Simon-MPFH> *everything* in Linux is a file
[20:30] <Simon-MPFH> even ports and gpio lines (if the driver is written correctly)
[20:30] <Simon-MPFH> so cat somefile.txt shows the text on screen
[20:30] <Laurenceb> one more question, how come "mkdir /config/gpio/switch1"
[20:30] <Laurenceb> creates /dev/gpio3 ?
[20:30] <Simon-MPFH> and cat somefile.txt | mypythonscript.py sends the text file to your python script
[20:31] <Simon-MPFH> Mmmm
[20:31] <Laurenceb> is that a kernel module that reads /config/gpio and creates the /dev/gpioX
[20:31] <Laurenceb> I presume you have to reboot the board for it to work
[20:31] <Simon-MPFH> eg /dev/sda for a hard disk
[20:32] <Simon-MPFH> Not played with gpio in linux yet but I guess the kernel module will cause the /dev nodes to be made at startup or modprobe
[20:32] <Laurenceb> so each directory in /config/gpio seems to create a /dev/gpioX entry
[20:32] <Simon-MPFH> makes sense
[20:33] <Laurenceb> ah ok modprobe
[20:33] <Laurenceb> cool
[20:33] <Laurenceb> something to try on monday
[20:33] <Simon-MPFH> In theory you hardly ever have to reboot linux - most stuff can be done on the fly
[20:33] <Simon-MPFH> good luck
[20:33] <Laurenceb> thanx
[20:34] <Simon-MPFH> I will play with this gumstix and try some gpio over the weekend
[20:34] <Simon-MPFH> nite nite
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[20:34] <Laurenceb> cya
[20:34] <Laurenceb> I'm a little worried about thorium dust :S
[20:34] <Laurenceb> there was a load over the ioniser when it came back... tried to clean it off
[20:34] <Laurenceb> need a geiger counter
[20:35] <natrium42> you have thorium in there?!
[20:35] <Laurenceb> yes
[20:36] <Laurenceb> http://wiki.ukhas.org.uk/_media/projects:dscn0984.jpg
[20:36] <natrium42> you use it to ionize particles?
[20:36] <Laurenceb> there are thorium electrodes embedded in the bottom
[20:37] <Laurenceb> it looks pretty radioactive :D nuclear stuff is always made of perspex
[20:39] <Laurenceb> unfortunately I drilled the air inlet into the wrong side :(
[20:39] <Laurenceb> but its not a big problem
[20:42] <Laurenceb> basically we use corona discharge off the electrodes to ionise the particles, then the E field pulls them onto SEM targets on the end of those big nylon bolts
[20:56] <Laurenceb> interesting: http://news.bbc.co.uk/1/hi/sci/tech/7234809.stm
[20:57] <Laurenceb> one of the guys in my lab is building the wind sensors for exomars
[20:58] <Laurenceb> the design seems to keep changing
[20:59] <Laurenceb> bbl
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[00:00] --- Sat Feb 9 2008