highaltitude.log.20100117

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[00:05] <Laurenceb> very useful for magnetometers
[00:07] <Laurenceb> shifts by - ~0.1degrees/year interesting
[00:10] <Laurenceb> natrium42: ping
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[08:56] <jcoxon> morning all
[08:56] <MikeMc> morning
[08:56] Action: jcoxon - BH4 Build Day 2
[08:56] <MikeMc> lovely day today
[08:57] <jcoxon> MikeMc, i'm on placement on weekdays at Medway Hospital - so not too far from you :-)
[09:01] <MikeMc> cool
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[10:43] <jcoxon> morning Laurenceb
[10:43] <jcoxon> Laurenceb, did you get the email about atlantichalo meeting this evening?
[10:44] Action: Laurenceb checks email
[10:44] <jcoxon> or am i still getting your email address wrong
[10:44] <Laurenceb> nope
[10:47] <Laurenceb> k thanks
[10:48] <jcoxon> i've also updated my contacts so won't happen again :-)
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[11:26] <jcoxon> yay it actually worked!
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[11:43] <jcoxon> hey juxta , no flight then?
[11:43] <juxta> hey jcoxon
[11:44] <juxta> CASA got back to me and said not yet
[11:44] <juxta> bunch of clowns
[11:44] <jcoxon> oh well, patience is the first rule of ballooning :-)
[11:44] <juxta> yeah
[11:44] <juxta> they reminded me to pay them though
[11:44] <jcoxon> means you can do even more testing
[11:44] <juxta> yeah, hopefully will do some more tonight
[11:44] <jcoxon> that is just harsh, having to pay
[11:45] <juxta> thankfully though this payment lets me launch for 2 years
[11:45] <juxta> from the same site
[11:45] <jcoxon> oh thats good
[11:45] <jcoxon> if people get interested they could use your site and share the cost?
[11:46] <juxta> I think so, so long as "I" launch it
[11:46] <juxta> I have to provide ID etc
[11:47] <juxta> for future launches I just need to give them a few days notice
[11:47] <jcoxon> thats like the setup we have
[11:50] <juxta> ah right
[11:50] <juxta> minus the inital payment I guess
[11:50] <jcoxon> yeah
[11:51] <juxta> we have a big shed where we're launching from
[11:51] <juxta> so we can get away from the wind to inflate the balloon
[11:53] <juxta> jcoxon: what kind of length do you use for the balloon train?
[11:53] <juxta> that's the one thing I'm still not sure of
[11:53] <jcoxon> we find the longer the better really
[11:54] <jcoxon> some people work on a 1:3 ratio i think
[11:55] <jcoxon> but i haven't yet got my head round that - would need to speak to rjharrison
[11:56] <juxta> hmm
[11:56] <juxta> our met beuro use 40m lines on their radiosondes
[11:57] <jcoxon> yeah, we usually go for as long as we've got
[11:57] <juxta> i'm hoping not to have to use 40m, or I'll have a very long run of wire to my cutdown
[11:57] <jcoxon> 10m +
[11:57] <jcoxon> i usually place my parachute close to the payload then the cutdown just above and then a long line up to the ballloon
[11:57] <juxta> ah okay
[11:58] <juxta> I've got to carry a radar reflector too though
[11:58] <jcoxon> though i don't bother with cutdowns these days
[11:58] <juxta> which is quite large
[11:58] <jcoxon> put it at the bottom?
[11:58] <juxta> i thought about that, but it's basically a parachute on its own - if I put it at the bottom, everything will invert on the way down
[12:02] <jcoxon> do you want to get it back?
[12:02] <jcoxon> could you put it above teh payload?
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[12:04] <jcoxon> hmmm where can i get a thin 5cm diameter plastic disc
[12:05] <jcoxon> to be used to open and close a photogate measuring pump revolutions
[12:06] <SpeedEvil> ice-cream tub
[12:06] <SpeedEvil> slice a ring out of the top
[12:06] <SpeedEvil> or use a rectangle 5*1cm
[12:09] <jcoxon> SpeedEvil, with the rectangle, just do the opposiite and measure when the rectangle passes through the gate rather then when the gap passes through the gate on the disc?
[12:09] <juxta> if you want a stiffer plastic I usually buy plastic trash bins from the hardware store for a couple of bucks and cut them up
[12:09] <Laurenceb> jcoxon: use a magnet :P
[12:10] <juxta> jcoxon: CASA want the radar reflector to stay with the payload on the way down as well as the way up
[12:12] <jcoxon> juxta, oh right
[12:13] <juxta> has anybody used the wire to the cutdown itself as the balloon line?
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[12:20] <jcoxon> not that i know of
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[12:31] <Laurenceb> prob not a good idea
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[13:13] <Laurenceb> the documentation for STM32 is brilliant
[13:13] <Laurenceb> well - compared with other ARm
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[13:13] <Laurenceb> http://www.st.com/mcu/familiesdocs-110.html <- v nice
[13:18] <jcoxon> Laurenceb, convert to the STM32 then?
[13:18] <Laurenceb> indeed
[13:21] <Randomskk> they are super nice
[13:21] <Randomskk> though I didn't think the docs were that fantastic when I was getting started, just a general lack of resources
[13:22] <Randomskk> but more and more hobbyists are picking them up now
[13:22] <SpeedEvil> I like 'The definitive guide to the arm cortex m3' as a book
[13:22] <Randomskk> check out libopenstm32 for an open-source replacement for ST's peripheral library which looks set to be better, though is still very new
[13:22] <Randomskk> also Maple from Leaflabs, which is their attempt at an arduino-like clone using an stm32, but also has their USB bootloader (which is fantastic) and their own peripheral library
[13:23] <jcoxon> yeah i saw that maple board recently
[13:25] <jcoxon> Laurenceb, will you be around thi evening?
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[13:25] <Laurenceb> jcoxon: prob not sorry
[13:26] <Laurenceb> I'm busy till late
[13:26] <Laurenceb> Randomskk: the ST perif lib is at least understandable
[13:26] <Randomskk> yes
[13:26] <Randomskk> and it works, by and large
[13:26] <Laurenceb> way better than most offerings
[13:26] <Randomskk> but it is a bit messy
[13:26] <Laurenceb> yeah
[13:26] <Randomskk> also its documentation is not fantastiwc
[13:26] <Randomskk> fantastic*
[13:26] <jcoxon> Laurenceb, okay, no worries
[13:27] <Laurenceb> I'm just playing about with some DMA code
[13:27] <Randomskk> it doesn't actually explain what anything does, only what possible parameters you can pass, so you have to keep cross-referencing the main datasheet
[13:27] <Laurenceb> at least the variable names help to explain it
[13:27] <Randomskk> my robot2 repo on github has stm32 doing DMA to SPI
[13:27] <Randomskk> true
[13:27] <Laurenceb> but they need to learn to comment their code :P
[13:27] <Laurenceb> can you DMA the ADC?
[13:27] <Laurenceb> swapping between channels?
[13:28] <Laurenceb> so DMA ADC 1,2,3,4 etc into the buffer
[13:28] <Randomskk> well it has two ADCs and many multiplexed inputs to both
[13:28] <Randomskk> I believe you can have it cycle between multiplexed inputs while DMAing
[13:28] <Laurenceb> thats v useful if you can
[13:29] <Randomskk> certainly at the least you can do two, by having the two ADCs in simultaneous free running mode
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[14:45] <jcoxon> oooo this pump is suprisingly accurate
[14:45] <jcoxon> +/- 5mls
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[16:47] <SpeedEvil> :)
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[18:39] <jcoxon> evening all
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[22:21] <Laurenceb> back
[22:21] <Laurenceb> what no meeting
[22:21] <Laurenceb> jcoxon ?
[22:21] <jcoxon> hey Laurenceb
[22:21] <jcoxon> no one was around
[22:21] <Laurenceb> :(
[22:21] <Laurenceb> poor jcoxon
[22:21] <jcoxon> hehe i didn't wait around long :-p
[22:21] <Laurenceb> ;D
[22:22] <jcoxon> started the page for flight 1
[22:22] <Laurenceb> brb
[22:22] <jcoxon> and found another example of a zp launch back in 2007 by MIT
[22:27] <Laurenceb> interesting, any links?
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[22:32] <jcoxon> http://spacenear.us/wiki/doku.php#links
[22:32] <jcoxon> the new link is: http://w1mx.mit.edu/balloon-program
[22:33] <jcoxon> they made a really nice HF transmitter
[22:35] <Laurenceb> hmm that looks familiar
[22:36] <Laurenceb> I think some of the guys came on here at some point
[22:40] <jcoxon> maybe
[22:44] <jcoxon> it was quite a while ago
[22:44] <Laurenceb> bbl
[22:44] <jcoxon> they have schematics for their beacon
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[00:00] --- Mon Jan 18 2010