highaltitude.log.20100529

[00:00] <Lunar_Lander> http://glinkaresearch.webs.com/
[00:00] <Lunar_Lander> :P
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[10:57] <G8DSU> Its all very quiet on here at the moment...
[11:00] <jonsowman> exams
[11:35] <G8DSU> Ah! I'll tiptoe quietly away...
[11:36] <jonsowman> not much time for HAB'ing at the moment unfortunately
[11:36] <jonsowman> after exams :)
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[11:38] <juxta|console> ive got a bit more time now
[11:38] <juxta|console> sort of
[11:39] <juxta|console> but the weather is terrible at the moment
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[15:47] <rjharrison_eee> ping DanielRichman
[15:48] <rjharrison_eee> ping Randomskk
[15:48] <DanielRichman> hello rjharrison_eee
[15:48] <rjharrison_eee> hEY DanielRichman Did you manage to compile the code?
[15:48] <rjharrison_eee> I think I have commited everything
[15:49] <DanielRichman> rjharrison_eee, yeah it compiles. see #highaltitude99
[15:49] <DanielRichman> rjharrison_eee, have been messing around trying to get it to restart/update the thread's config when it changes but haven't finished yet
[15:49] <rjharrison_eee> Ohh I'm out and about atm
[15:49] <rjharrison_eee> will check when I get home in an hour
[15:50] <rjharrison_eee> That was my next step
[15:51] <rjharrison_eee> I wasn't sure how to get the info to the thread other than checking to see if a global had been set
[15:52] <rjharrison_eee> Probably fall out of the inner loop, drop and restart the serial connection
[15:53] <DanielRichman> rjharrison_eee, not as simple as that I don't think
[15:53] <rjharrison_eee> I was having a problem with the huge buffer of the serial input this morning until I found out how to flush it
[15:53] <DanielRichman> rjharrison_eee, I've implemented that much
[15:53] <DanielRichman> rjharrison_eee, the dropping out
[15:53] <DanielRichman> rjharrison_eee, but the problem is that the thread will spend most of its time blocked inside fgets
[15:54] <DanielRichman> rjharrison_eee, and if the serial settings are incorrect/the gps device goes away it's going to sit there I think
[15:54] <rjharrison_eee> If the gps_serial var is destryed it can be recreated with the new details
[15:54] <DanielRichman> rjharrison_eee, so I was looking at sending the thread a signal to kill it
[15:54] <rjharrison_eee> Yep I have some debugging to add
[15:55] <DanielRichman> or instead we could use select & non-blocking IO to give it a timeout on the serial
[15:55] <rjharrison_eee> Did you manage to test it.
[15:55] <DanielRichman> rjharrison_eee, no :P
[15:55] <DanielRichman> sorry
[15:55] <rjharrison_eee> Sorry about my crap coding
[15:56] <rjharrison_eee> Im sure your solution would have been more eligant
[15:56] <rjharrison_eee> I stole some of the code from the icarus project
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[16:03] <DanielRichman> rjharrison, no It's fine. One thing I only thought of today which I probably should have earlier is that we can use fscanf to make parsing of the GPS a bit easier, but now that he code has been written no need to do again
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[16:45] <Lunar_Lander> hello
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[17:34] <DanielRichman> "Enabling Sample and Hold, will increase noise and reduce resolution below 8 bit" - don't like the sound of that
[17:35] <SpeedEvil> probably only with a low impedence source
[17:35] <SpeedEvil> charge injection
[17:36] <DanielRichman> hmm so the above note in an ATxmega errata sheet isn't cause for worry using its 12bit DAC normally, SpeedEvil ?
[17:37] <SpeedEvil> Are you sure that's not the ADC?
[17:37] <DanielRichman> I quote directly:
[17:37] <DanielRichman> Some DAC configurations or operating condition will result in increased output error.
[17:38] <DanielRichman>  INL error is increased up to 35 LSB when VCC < 2.0V
[17:38] <DanielRichman>  Enabling Sample and Hold, will increase noise and reduce resolution below 8 bit
[17:38] <SpeedEvil> ah
[17:38] <SpeedEvil> what are you using the DAC for?
[17:38] <DanielRichman> Was looking at its suitability for making Dominoex
[17:38] <SpeedEvil> ah
[17:39] <SpeedEvil> Speaking personally, I'd just use a couple of 25 turn pots to set the top/bottom voltages.
[17:39] <SpeedEvil> Which eliminates most concerns about the DAC linearity.
[17:40] <DanielRichman> so accurately scale the output of the DAC?
[17:40] <SpeedEvil> yes
[17:40] <DanielRichman> does it even need to be accurately scaled: if scaled into roughly the right range software adjustments could do the last bit
[17:40] <DanielRichman> since it will then have enough accuracy
[17:41] <SpeedEvil> exactly
[17:41] <SpeedEvil> plus - you proably don't care much about hitting 433.075654
[17:41] <SpeedEvil> just the relative.
[17:41] <DanielRichman> indeed
[17:41] <DanielRichman> + the payload will have an uplink. I'll have the ability to reconfigure the values during flight if it drifts off
[17:41] <DanielRichman> relative values, that is
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[17:42] <SpeedEvil> That capability also means that pert of the code can screw up.
[17:42] <DanielRichman> true
[17:42] <DanielRichman> it will be put through some srs testing ; I'll try not to :)
[17:43] <DanielRichman> perhaps also on a timer: ie, default, known settings in memory; uplink can reconfigure the domino but it will revert if the changes arn't renewed after 5 minutes, etc.
[17:44] <DanielRichman> I just printed off the footprint of one of these (atXmega64a4) and am now doubting my ability to solder it :P
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[19:52] <jcoxon> evening all
[19:52] <Lunar_Lander> hi jcoxon
[19:52] <Lunar_Lander> how's life?
[19:52] <Lunar_Lander> :)
[19:53] <jcoxon> its okay thanks, final exam on tues
[19:54] <Lunar_Lander> oh I see
[19:54] <Lunar_Lander> I got theoretical physics on monday
[19:54] <jcoxon> so a little stressed :-)
[19:54] <Lunar_Lander> yeah same here :)
[19:55] <Lunar_Lander> but I have to say, LaTeX is amazing
[19:55] <Lunar_Lander> and I got a quick question if that is OK?
[19:55] <jcoxon> sure, go for it
[19:56] <Lunar_Lander> do you have complete records of your flight? I'd need max.altitude, inflation volume, balloon and payload weight
[19:57] <jcoxon> not all together
[19:57] <jcoxon> and i don't have the inflation volume
[19:58] <Lunar_Lander> do you have the gross lift?
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[19:58] <jcoxon> haven't recorded it
[19:58] <jcoxon> cusf have got better records
[19:58] <jcoxon> one sec
[19:59] <jcoxon> http://www.srcf.ucam.org/~cuspaceflight/wiki/doku.php
[19:59] <Lunar_Lander> ok
[19:59] <Lunar_Lander> hey cooll
[19:59] <Lunar_Lander> -l
[19:59] <Lunar_Lander> thanks
[19:59] <jcoxon> launches don't lend themselves to good record keeping
[19:59] <Lunar_Lander> I want to have them to check against the spreadsheet
[19:59] <Lunar_Lander> yeah
[19:59] <jcoxon> its always a bit rushed and focused on the current mission
[19:59] <Lunar_Lander> thank you :)
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[19:59] <Lunar_Lander> yea
[19:59] <DanielRichman> What does everyone here use to get their PCBs made?
[20:00] <jcoxon> DanielRichman, i've used olimex and seeedstudio
[20:00] <jcoxon> though seeedstudio require gerber now while they used to accept eagle which makes me sad
[20:00] <Lunar_Lander> jcoxon do you have another minute?
[20:00] <jcoxon> yes
[20:01] <DanielRichman> for seeed, the price {Fusion PCB} 2 Layer 5cm*5cm max -10pcs for - $20.00
[20:01] <DanielRichman> is that ten 25cm^2 boards?
[20:01] <jcoxon> yes
[20:01] <DanielRichman> no way to order less; I see
[20:01] <jcoxon> well you can do open source and get 5
[20:01] <jcoxon> iirc
[20:01] <DanielRichman> and olimex you have to make your boards exactly the rectangle size
[20:01] <jcoxon> DanielRichman, no you can put multiple boards on their
[20:02] <DanielRichman> ah true
[20:02] <jcoxon> just send them a picture of how you want it laid out
[20:02] <DanielRichman> squeese many into their rectangle
[20:02] <jcoxon> olimex are annoying as they require a credit card and faxing
[20:02] <jcoxon> who uses faxes these days!
[20:02] <DanielRichman> eugh
[20:02] <DanielRichman> what is seeed's shipping like?
[20:02] <jcoxon> hongkong style
[20:02] <jcoxon> so slow
[20:02] <DanielRichman> ££?
[20:02] <Lunar_Lander> jcoxon http://www.mediafire.com/?k2tyidmyozm
[20:03] <Lunar_Lander> please check this
[20:04] <jcoxon> Lunar_Lander, hehe those calculations are a little beyond my maths
[20:05] <jcoxon> you'd need to get some body to check it really :-
[20:05] <jcoxon> p
[20:05] <Lunar_Lander> It is reverse engineering
[20:05] <Lunar_Lander> :P
[20:05] <DanielRichman> jcoxon, how much does the seeed shipping cost?
[20:05] <Lunar_Lander> I took the "burst1a" sheet
[20:05] <Lunar_Lander> and looked at the relations of the cells
[20:05] <jcoxon> i suggest chatting to edmoore next week (after he hands in his project)
[20:05] <jcoxon> and then rocketboy (Steve Randall) regarding his equations
[20:05] <Lunar_Lander> yeah
[20:06] <Lunar_Lander> but despite that, I think that the layout is good
[20:06] <Lunar_Lander> LaTeX rocks! :P
[20:06] <jcoxon> DanielRichman, i canny remember
[20:06] <DanielRichman> jcoxon, ok d/w
[20:07] <jcoxon> DanielRichman, airmail for me cost ~$3
[20:07] <DanielRichman> ahh OK
[20:24] <rjharrison> Lunar_Lander I have data for about 15 launches
[20:24] <Lunar_Lander> yay
[20:24] <Lunar_Lander> I checked your website already
[20:24] <Lunar_Lander> is it all there or is there data you don't have online yet?
[20:25] <rjharrison> I have all the data in the tracker
[20:25] <Lunar_Lander> very nice
[20:25] <rjharrison> For last years launches most of them
[20:25] <rjharrison> Humm but not mass
[20:25] <Lunar_Lander> yeah, I think I can use that anyway
[20:25] <rjharrison> do you want the cusf and other launches
[20:26] <Lunar_Lander> yes, any launches will do
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[23:29] <jcoxon> sweet olimex now do paypal
[23:29] <jcoxon> amazing
[23:30] <Lunar_Lander> jcoxon
[23:30] <Lunar_Lander> it is amazing
[23:30] <Lunar_Lander> VICTORY!
[23:30] <jcoxon> hehe indeed
[23:30] <jcoxon> right night all
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[23:30] <Lunar_Lander> Whoa shit
[23:30] <Lunar_Lander> sorry people
[23:30] <Lunar_Lander> So sorry you did last place
[23:30] <Lunar_Lander> :(
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[00:00] --- Sun May 30 2010