highaltitude.log.20100202

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[04:46] <juxta> hi natrium42, you about?
[04:46] <natrium42> yo
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[05:10] <icez> oh
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[07:15] <juxta> natrium42: still there?
[07:15] <juxta> kinda got sidetracked here
[07:17] <natrium42> hehe, sup?
[08:17] <juxta> oh man
[08:17] <juxta> I need to pay better attention to my irc client
[08:17] <juxta> jcoxon mailed me back about the custom data - I was just wondering if it might be possible to change the field names on the tracker
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[08:40] <natrium42> juxta, what are the field names?
[08:41] <juxta> natrium42: numSats;intTemp;extTemp;pressure(hPa);humidity(%)
[08:41] <juxta> GPS sats, internal temp, external temp, pressure, humidity
[08:41] <juxta> temps are in deg C
[08:45] <natrium42> that should do it
[08:46] <natrium42> going to catch some sleep, gnite
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[08:47] <MikeMc68> morning
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[10:35] <Laurenceb> http://i.imgur.com/8JXqJ.jpg
[10:35] <Laurenceb> thats a better shot of my anemometer sensor
[10:36] <russss> cool
[10:37] <Laurenceb> pop rivet with 2mm hole down the middle
[10:38] <Laurenceb> then decanned "grain of rice" bulb stuck in the side
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[10:39] <russss> ah, pretty small then
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[10:40] <Daniel_Richman> *gah* nickserv -.-
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[11:21] <juxta> hi all
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[13:27] <[EI5GTB]> afternoon
[13:27] <juxta> hi [EI5GTB]
[13:36] <[EI5GTB]> hows things?
[13:40] <juxta> not too bad, just gearing up for launch on Friday :)
[13:44] <[EI5GTB]> cool cool
[13:44] <[EI5GTB]> what time are you launching?
[13:45] <juxta> not ideal for you lot unfortunatley :)
[13:45] <juxta> 02:00 UTC
[13:46] <juxta> a bit worried about my balloon train weight at the moment
[13:47] <[EI5GTB]> oh... thats pretty early for me... i thiught you were in th UK
[13:48] <juxta> nah - I'm in Australia
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[15:45] <edmoore> jonsowman: yo
[15:45] <edmoore> are you there?
[15:45] <edmoore> or perhaps that should be: AAAAARRRRRRGGHHH ye thar?
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[18:39] <jcoxon> evening all
[18:39] <russss> hey
[18:39] <jcoxon> hey russss
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[18:54] Action: jcoxon is waiting for gps lock again
[19:03] <jcoxon> oooo 1 gps sat
[19:09] <MikeMc68> evening \O/
[19:09] <jcoxon> hey MikeMc68
[19:10] <jcoxon> my worry was that the EPS i'm using would block the gps signals
[19:10] <jcoxon> but if 1 sat has got through and i'm in a terrible gps position - i'm sure this flat is a faraday cage then it should be okay outside :-p
[19:11] <jcoxon> oh wow
[19:12] <jcoxon> if we float at 30km on saturday after 4hrs we'll reach poland...
[19:12] <DanielRichman> do it!
[19:13] <jcoxon> i'm not sure thats a good idea - we must break quite a few international laws crossing so many countries
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[19:13] <DanielRichman> and start a bomb scare
[19:14] <jcoxon> and if we flew like we did for BH2 (7hrs float): it would reach belarus
[19:15] <jcoxon> 1848km
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[20:28] <jcoxon> yay full gps lock
[20:36] <MikeMc68> cool
[20:37] <jcoxon> right next step is to run some simulations
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[21:54] <jcoxon> hmmm is wunderground broken for anyone else?
[21:54] <jcoxon> http://www.wunderground.com/modelmaps/maps.asp?model=GFS&domain=EU
[21:54] <jcoxon> ?
[21:56] <DanielRichman> GFS initialized at NaNz on NaN/NaN
[21:56] <DanielRichman> Invalid Date
[21:56] <jcoxon> damn then its not just me
[22:01] <jcoxon> could really do with some GFS maps
[22:01] <jcoxon> have to go somewhere else
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[22:13] <natrium42> o/
[22:14] <Randomskk> \o
[22:16] <natrium42> how goes, Randomskk
[22:16] <natrium42> ?
[22:17] <Randomskk> eh, my AVR won't program and I'm not sure why, so I'm gonna try soldering a new one.
[22:17] <Randomskk> besides that, basically, work work work
[22:17] <jcoxon> hey natrium42
[22:18] <natrium42> hi jcoxon
[22:18] <jcoxon> wonder when that radio will arrive
[22:18] <natrium42> Randomskk, poke it with a stick
[22:18] <jcoxon> which really translates as how much do i trust in the efficency of Royal Mail
[22:25] <natrium42> haha
[22:26] <Randomskk> I have tried the stick and also resoldering every one of its qfn pins to no avail
[22:26] <natrium42> maybe there is an error in your schematic
[22:27] <natrium42> also, are you sure the orientation is right?
[22:27] <Randomskk> it is correct as per my pcb, and I checked the schematic and it seems okay
[22:28] <Randomskk> also I checked continuity for each ICSP and power pin and that seems fine
[22:28] <Randomskk> and no shorts are apparent
[22:28] <natrium42> so power is supplied?
[22:28] <Randomskk> yea, by the programmer
[22:28] <Randomskk> and I can measure 5V on the power pins
[22:28] <natrium42> and continuity of ICSP pins is there?
[22:28] <Randomskk> plus reset is pulled high
[22:28] <Randomskk> yup
[22:28] <natrium42> which avr? maybe it doesn't have ICPS enabled?
[22:29] <Randomskk> atmega168PA
[22:29] <natrium42> some newer ones only have JTAG enabled by default
[22:29] <Randomskk> it is possible I fried the chip or something, it probably reflowed somewhat hotter than it needed to I suspect and the qfn part has a giant thermal pad
[22:29] <natrium42> so you should check on that
[22:29] <Randomskk> it doesn't have jtag at all
[22:29] <natrium42> ah
[22:29] <natrium42> build a second one and retry?
[22:30] <Randomskk> that's my current plan, just put down the atmega and some decoupling caps and the reset pullup
[22:30] <Randomskk> and if it works place everything else and reflow a second time
[22:31] <natrium42> yeah, sounds like a good plan
[22:36] <natrium42> jcoxon, do you have a canon or nikon camera?
[22:38] <jcoxon> natrium42, i don't unfortinately
[22:38] <natrium42> k...
[22:39] <natrium42> i am making a neat little app to send snapshots to the tracker
[22:39] <natrium42> going to run on windows and osx for now
[22:39] <jcoxon> all my canons got taken apart a while ago :-p
[22:39] <jcoxon> and i can't afford a DSLR
[22:40] <Randomskk> natrium42: why do you ask?
[22:41] <jcoxon> he wants launch photos :-p
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[23:00] <jcoxon> hey juxta
[23:00] <juxta> hey jcoxon
[23:00] <juxta> how's things?
[23:02] <jcoxon> not bad thanks, been doing some trajectory forecasts for the weekend
[23:02] <jcoxon> looking a little extreme - but its still a little too early i reckon
[23:02] <jcoxon> how about down under?
[23:03] <Laurenceb> hi
[23:03] <Laurenceb> jcoxon: whens the launch?
[23:03] <jcoxon> saturday i'm thinking - but am carefully watching the weather
[23:03] <Laurenceb> cool, good luck
[23:03] <jcoxon> saturday at 15:00
[23:05] <juxta> Friday's looking good here :)
[23:05] <Laurenceb> Rodger Farley has rerun the sim
[23:06] <jcoxon> juxta, good good - i've got work on friday so won't be able to stay up to follow :-)
[23:06] <Laurenceb> flew to Yugoslavia
[23:06] <jcoxon> Laurenceb, oh thats good :-p
[23:07] <Laurenceb> in 4 nights
[23:09] <Laurenceb> he thinks PID will work
[23:12] <jcoxon> great
[23:13] <jcoxon> now to build the thing...
[23:14] <Laurenceb> heh
[23:14] <Laurenceb> I looked at RocketBoys design
[23:15] <Laurenceb> I guess its not crazy to run data lines up as the antenna
[23:15] <Laurenceb> guess we need gnd,supply for pump, and a line to the rev counter
[23:16] <juxta> jcoxon: I was worrying about ascent rate with my balloon
[23:16] <juxta> all told I'm quite heavy, around 1500 grams
[23:16] <Laurenceb> but I'd still like to stick the pump in with the tronics
[23:16] <Laurenceb> and use a hose
[23:16] <juxta> & I only have 3.4m of helium, so it looked like was going to end up with a slow ascent
[23:16] <jcoxon> juxta, thats okay - you probably won't break any records
[23:17] <jcoxon> Laurenceb, hmmm i'm not certain about this hose idea
[23:17] <Laurenceb> why not?
[23:17] <juxta> jcoxon: but if I go too slowly, the wind will blow way off & I may end up in the ocean
[23:17] <juxta> in any case - one of the hams rang me up this morning to tell me he bought another helium cylinder
[23:17] <juxta> :D
[23:18] <jcoxon> juxta, need to use ascent1a to work out how much helium to put in
[23:18] <juxta> jcoxon: yeah I have been
[23:18] <juxta> 4 cubic meters would be ideal
[23:18] <jcoxon> Laurenceb, cause its going to need to draw the ballast quite far up
[23:19] <jcoxon> juxta, the key is work out how much free lift you want for you planned ascent rate, fill up a bag with free lift weight + payload weight
[23:19] <juxta> & then balance it?
[23:19] <jcoxon> when the balloon is able to lift this combined weight (well more like neutral bouyancy) then you are set to go
[23:19] <juxta> good plan
[23:19] <juxta> how do you interrupt the filling & test the balloon?
[23:20] <Laurenceb> jcoxon: no
[23:20] <Laurenceb> ballast above
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[23:20] <jcoxon> Laurenceb, oh right now thats a differnent matter - didn't think of that
[23:20] <MikeMc68> woh i got disconnected and didn't realise
[23:21] <jcoxon> juxta, well we use a regulator so you just turn it off for a bit
[23:21] <jcoxon> are you using a 'filler tube' or directly off the canister
[23:21] <jcoxon> ?
[23:21] <juxta> jcoxon: nah, a regulator also
[23:21] <juxta> do you remove it from the neck to test the lift?
[23:21] <Laurenceb> jcoxon: if we use the right hose - ie silicone
[23:22] <Laurenceb> it should be ok at the low temperature
[23:23] <jcoxon> juxta, let me find a picture
[23:23] <jcoxon> Laurenceb, yeah the tubing should be okay
[23:23] <juxta> jcoxon: www.bogaurd.net/IMG_3321.jpg
[23:23] <juxta> that's what I made up
[23:23] <jcoxon> perfect
[23:24] <jcoxon> so what you do is you hang the bag off the tube
[23:24] <jcoxon> in the bag you put:
[23:24] <jcoxon> (weight of payload + free lift weight - filler weight)
[23:24] <juxta> yeah
[23:24] <jcoxon> then when this is all lifted you are at the right vol of helium
[23:25] <juxta> how do you make sure the balloon doesnt slip off the filler? will zip ties suffice?
[23:25] <juxta> I used 32mm pipe as the balloon neck is 30mm
[23:25] <jcoxon> juxta, yes
[23:25] <jcoxon> we use zip ties
[23:25] <jcoxon> its already a tight fit
[23:27] <juxta> alrighty
[23:27] <juxta> i might put an elbow on it too to make it easier to hang things from
[23:27] <jcoxon> thats another option
[23:27] <jcoxon> wooo, managed to embed google maps into dokuwiki
[23:32] <natrium42> hehe
[23:33] <jcoxon> witht the googlemaps plugin you can also load kmls
[23:33] <jcoxon> so in theory i could have an embeded map of the tracker's kml file
[23:38] <Laurenceb> gtg
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[23:38] <jcoxon> night Laurenceb
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[23:50] <juxta> hey jcoxon, is twisting much of an issue for most people?
[23:50] <juxta> as in twisting of the balloon lines
[23:51] <jcoxon> hmmm it something thats quite hard to stop
[23:51] <jcoxon> its not great, you'll find it twisted up quite a bit when you recover it
[23:51] <jcoxon> whether this is on ascent or descent is quite hard to tell
[23:51] <jcoxon> a spacer might help on the parachute
[23:52] <juxta> yeah I was thinking of a swivel
[23:52] <juxta> something like a fishing swivel
[23:52] <MikeMc68> Anyone know if a Nokia 1650 can be hacked easily enough to send SMS ?
[23:53] <juxta> MikeMc68: probably tricky, I doubt it has a real UART
[23:53] <jcoxon> right night y'all
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[23:55] <SpeedEvil> just use a n900 - and do it over DBUS :)
[23:56] <MikeMc68> lol yeah - thats a nice cheap phone
[23:57] <juxta> there's a library around for easy interfacing with an AVR running arduino MikeMc68
[23:57] <juxta> this one:
[23:57] <juxta> http://code.google.com/p/sserial2mobile/
[23:57] <MikeMc68> yeah i know
[23:57] <MikeMc68> but can that be used with an 1650?
[23:58] <juxta> I dont think so
[23:58] <juxta> that relies on a real uart being available on the phone
[00:00] --- Wed Feb 3 2010