highaltitude.log.20120105

[00:10] <Lunar_Lander> good night
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[07:36] <eroomde> morning jcoxon
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[07:42] <jcoxon> hey eroomde
[07:44] <UpuWork> morning all
[07:45] <jcoxon> bit windy currently here
[07:45] <UpuWork> and here
[07:45] <eroomde> and here
[07:45] <x-f> and here
[07:45] <UpuWork> seems we have concensous
[07:45] <fsphil> aye
[07:46] <number10> "
[07:46] <jcoxon> hope it calms a bit before the weekend
[07:46] <fsphil> almost as bad as the last storm
[07:46] <jcoxon> though the forecasts are typically variable
[08:04] <jcoxon> http://ukhas.org.uk/projects:picoatlas:picoatlasvi#pictures
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[09:37] <costyn_> did I mention it was windy yet? :)
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[10:13] <WillDuckworth> very breezy... no launch for me this weekend :( typical. got NOTAM too
[10:14] <SpeedEvil> high altitude kite
[10:16] <fsphil> you could probably launch in this
[10:16] <WillDuckworth> i'd really like to get it back ;) - when are you launching fsphil?
[10:16] <daveake> It was very gusty (but not this bad) for my last launch, but there were quiet periods too
[10:17] <fsphil> Mid-March is the current plan
[10:17] <fsphil> Miller permitting
[10:17] <WillDuckworth> ha ha
[10:17] <daveake> Miller Time
[10:17] <Darkside> miller effect?
[10:17] <Darkside> reduces frequency response
[10:17] <Darkside> the frequency of emails from him
[10:29] <daveake> Oh goody, my FSA03s have arrived :)
[10:30] <Darkside> eew FSA03s :P
[10:30] <daveake> They were showing as 7 in stock over Xmas, and I feared jcoxon had cleared them out :p
[10:30] <Darkside> haha
[10:30] <number10> I bent the antenna on one of mine - broke the plastic - I think I may blob some glue on them
[10:31] <Darkside> thr sarantel antennas are very fragile
[10:31] <daveake> yeah, seems like a good idea
[10:31] <Darkside> the bit of hardline in the middle of them breaks off easily
[10:31] <Darkside> make sure you still get lock before you do anything
[10:31] <daveake> As before these are the -lp ones
[10:31] <number10> will do
[10:32] <number10> how many did you get daveake?
[10:32] <daveake> 2, and I had 2 already
[10:32] <number10> *number10 wonders how many expected sea ditchings - so about three ;)
[10:32] <daveake> lol
[10:32] <daveake> Also I may do some pico launches ...
[10:33] <number10> oh - nice
[10:33] <daveake> ... also these could be an investment for when there's no stock LOL
[10:33] <number10> I wonder how much added wight that NEO6 can adds compared to an FSA03
[10:34] <daveake> Dunno. What's an NEO6? FSA03 is 8g
[10:35] <Darkside> the main weight is in the antenna
[10:35] <WillDuckworth> are there smaller 'chip' type gps antennas available?
[10:36] <number10> gps module from ublox - just needs antenna and decoupling - Upu has don a breakout board
[10:36] <Darkside> WillDuckworth: of course there are
[10:36] <Darkside> but you pay the performance cost
[10:36] <WillDuckworth> mmm, thought so
[10:36] <Darkside> the helical antennas work well in any orientation, which helps when you land
[10:37] <number10> daveake: http://ukhas.org.uk/guides:ublox6
[10:40] <UpuWork> Still got some break out boards left if needed
[10:40] <daveake> number10 ta. Now I remember :)
[10:41] <number10> I'll remind you agin in a couple of weeks ;)
[10:41] <number10> again
[10:41] <daveake> It's my age
[10:42] <daveake> What's an NEO6?
[10:42] <number10> dunno
[10:42] <russss> http://code.nasa.gov/projects/
[10:42] <russss> interesting stuff coming out of NASA
[10:44] <daveake> WillDuckworth if you do launch, where from and where's it likely to go?
[10:45] <UpuWork> uBlox NEO-6Q is the GPS chip
[10:46] <UpuWork> http://ukhas.org.uk/_detail/guides:ublox.jpg?id=guides%3Aublox6
[10:47] <WillDuckworth> daveake: from deepest darkest Herefordshire, even from there it's a southeasterly course over the channel
[10:47] <daveake> Kinda coming this way then (berks)
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[10:55] <Elwell> anyone here have a surplus srif-3 chipset they'd like to flog? need something for timekeeping
[10:56] <Elwell> (or any other GPS chips that you bought and discovered they weren't high-altitude rated
[10:56] <x-f> Elwell, http://www.ebay.co.uk/itm/GPS-Module-Garmin-GPS-15-F-/140672411685
[10:57] Action: SpeedEvil noticed rubidium standards on ebay quite cheap
[10:57] <SpeedEvil> fun for timekeeping
[10:59] <UpuWork> http://www.egr.gvsu.edu/~borne/wordpress/wp-content/uploads/2011/12/Poster.jpg
[11:03] <x-f> Elwell, it's a serial GPS, 3.3V, has internal battery, sensitive and cheap enough, easy to connect (just the flex cable..)
[11:05] <Elwell> typical - this PCB has 5v only. I may just use DCF-77
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[11:23] <gonzo_> Rb are ok for short term stability but not that great long term
[11:24] <gonzo_> I have a GPS disciplined reference. Poor mans Cs reference
[11:27] <SpeedEvil> 10^-11 spec looked good.
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[11:36] <BrainDamage> gonzo_: what's the gps's stability?
[11:36] <BrainDamage> also, out of cursiosity, what's it for?
[11:38] <eroomde> gonzo_: whose gpsdo have you got OOI?
[11:38] <gonzo_> Not sure off hand, would have to check. But based on Cs ref in the satellite(s)
[11:39] <gonzo_> I have a JNT simple GPSDO, which is locked to the 10khz from a jupiter12 board
[11:39] <BrainDamage> no, you still have local clock jitter, you're not a transparent reciever
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[11:39] <gonzo_> and a ZAZ one, which uses a FLL and the 1pps output
[11:39] <eroomde> BrainDamage: i think they use pll's and a local source (usually)
[11:39] <eroomde> to eliminate most of the jitter
[11:40] <eroomde> so you get the stability from the gps's timing signal, and the low phase noise from a local reference, thanks to the pll
[11:40] <gonzo_> you will probably see the jitter in the simple JNT one, but the ZAZ allows you to set very long loop time
[11:41] <gonzo_> a friend uses the ZAZ board to steer a Rb ref. Best of both worlds
[11:41] <eroomde> yeah
[11:41] <eroomde> that's pretty serious huh
[11:41] <eroomde> i've made one before which steered a OCXO
[11:42] <eroomde> good for receivers large distances apart that need to be coherent
[11:44] <gonzo_> the Rb one was not actually that big a deal. Just replace the ocxo with the rb
[11:44] <gonzo_> they are on ebay for about £80 these days
[11:45] <SpeedEvil> 30
[11:45] <SpeedEvil> Though admittedly pulls
[11:45] <BrainDamage> I got a Rb oscillator, used, for 32¬ shipped
[11:45] <gonzo_> as an experiment he did put a standard ocxo DO and the Rb DO against each other to see how much jitter there was
[11:45] <BrainDamage> still has to arrive
[11:46] <gonzo_> not bad, depending on the tube life
[11:47] <gonzo_> to watch the drift he wired both refs to eack endd of a centre zero moving coil meter so you can see the drift as an angle
[11:56] <SpeedEvil> http://www.dealextreme.com/p/charging-power-adapter-with-usb-output-for-amazon-kindle-series-white-112863
[11:56] <SpeedEvil> How to avoid copyright issues.
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[11:59] <fsphil> aaaa
[12:00] <fsphil> not so sure that will work :)
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[12:56] <Laurenceb> http://search.digikey.com/scripts/dksearch/dksus.dll?KeywordSearch
[12:57] <BrainDamage> never copy digikey search result page
[12:57] <BrainDamage> it's useless
[12:58] <Laurenceb> oh wat
[12:58] <Laurenceb> yeah it breaks
[12:59] <Laurenceb> http://search.digikey.com/us/en/products/SX8725CWLTDT/SX8725CWLTDTCT-ND/2607364
[12:59] <Laurenceb> is what i wanted to link
[13:00] <Laurenceb> the pga is a little noisy, but its crazy fast
[13:00] <Laurenceb> also 1k times gain !
[13:03] <cuddykid> woohoo
[13:04] <cuddykid> managed to get some scraps of polycarbonate for free
[13:04] <cuddykid> 2mm should be ok to bend (hopefully)
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[13:30] <SpeedEvil> 2mm is quite bendy
[13:30] <SpeedEvil> roughly - it's about as stiff as a little bit thicker than it cardboard
[13:30] <SpeedEvil> so maybe 4mm cardboard
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[14:06] <fsphil> just spotted on /. that the c64 is 30 years old this month
[14:07] <UpuWork> I broke 3 of those yay
[14:08] <fsphil> nice, only 2 broke here
[14:08] <fsphil> thankfully replaced under warranty :)
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[14:08] <UpuWork> paper clip reset procedure wasn't covered under warranty
[14:08] <WillDuckworth> no way
[14:08] <WillDuckworth> feeling old now
[14:09] <fsphil> I must have got one towards the end of the C64's life, cause I was only 2 then
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[14:09] <UpuWork> I bought my first one with paper round money
[14:09] <UpuWork> took me 2 years to save up
[14:10] <fsphil> the brown one, or the later grey one?
[14:11] <Upu> oh brown one
[14:11] <Upu> with the melting PSU
[14:11] <fsphil> lol
[14:11] <fsphil> never had that happen - mine was the grey one
[14:11] <Upu> original C-64 PSU used to melt
[14:12] <fsphil> properly melt?
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[14:12] <Upu> pretty much yes
[14:12] <Upu> they were encased in resin
[14:13] <fsphil> from da internet: "given the speed with which the sealed black ones would melt!"
[14:13] <fsphil> I've a black one here, came with a second hand C64
[14:13] <Upu> http://jope.fi/cbm/cbm/c64psu.jpg
[14:13] <Upu> the one on the left
[14:13] <fsphil> that looks like a shoe
[14:14] <fsphil> it's the middle one I have
[14:14] <fsphil> but I also have a black version of it
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[14:18] <WillDuckworth> hey fsphil, what's your range record for 300 baud stuff?
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[14:20] <fsphil> for receiving, not a huge amount. about 300km I think
[14:21] <fsphil> others have received my payloads from 500km though, at 300 baud
[14:21] <WillDuckworth> cool, so it's doable - just thinking of variations
[14:21] <fsphil> oh yea, but it does mean the quality of your antenna and connections are more important
[14:22] <WillDuckworth> yeah - definitely
[14:22] <fsphil> I think Upu managed 700km from that floater at 300 baud
[14:22] <fsphil> black magic I think
[14:37] <Laurenceb> link budget says its easyily doable
[14:38] <Laurenceb> we cant get more than about 800 to 900km horizon tho
[14:49] <SpeedEvil> More if you have a balloon on both ends, but thatmigh be viewed as cheating
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[15:08] <cuddykid> 6 days until Sparkfun Free day!
[15:09] <UpuWork> can I be thick and ask what this means ?
[15:09] <Laurenceb> free whores
[15:09] <Laurenceb> and coke
[15:10] <UpuWork> no still confused
[15:10] <cuddykid> lol
[15:10] <UpuWork> oh so you visit the site
[15:10] <cuddykid> 2000 opportunities to win $100 spark fun credit
[15:10] <UpuWork> and you may get some money
[15:10] <cuddykid> yup
[15:10] <UpuWork> cool
[15:11] <cuddykid> not that great a chance but for $1000 certainly worth checking it quite a few times
[15:11] <cuddykid> *$100
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[15:14] <cuddykid> I would get one of the 9DOF IMUs if I won& until then I can dream on :P lol
[15:16] <fsphil> wonder how many things got made from the parts last time
[15:16] <fsphil> or much of that stuff is still in a box somewhere
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[15:16] <Laurenceb> http://www.flyingwings.co.uk/store/product_info.php?products_id=844&osCsid=6c4f51269ef39b61cf382ca83895926a
[15:16] <Laurenceb> try that
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[15:18] <cuddykid> oh nice
[15:19] <cuddykid> Laurenceb: have you seen the X8 wing?
[15:19] <Laurenceb> people from openpilot use it
[15:19] <Laurenceb> - the flyingwings
[15:19] <cuddykid> http://diydrones.com/profiles/blogs/x8-flying-wing
[15:19] <cuddykid> absolute beast
[15:19] <cuddykid> supports up to 2kg payload - large payload area aswell - perfect!
[15:19] <Laurenceb> looks impossible to control
[15:20] <cuddykid> yup
[15:20] <BrainDamage> the previous editions have been basically us - only contests
[15:20] <BrainDamage> because of latency from other countries
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[17:55] <nato> Hi everyone. I did a recent flight and have posted some data. I'm wondering if some of you could take a look and see if it makes sense. http://diyjunky.blogspot.com/2012/01/balloon-flight.html
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[18:01] <nato> Based on ascent rate and flight time, the max altitude was about 105,000 ft. That seems high, though, for a 200 g balloon.
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[18:08] <fsphil> 172g payload .. seems unlikely
[18:10] <cuddykid> nato: was it recovered? I'm guessing not because there was no gps on board..
[18:10] <fsphil> I would say your temperature minimum was closer to 10km
[18:10] <nato> cuddykid: no recovery.
[18:10] <fsphil> strange your radio didn't work better
[18:10] <fsphil> brb, food
[18:11] <cuddykid> nato: I would agree with fsphil: personally I think your min temp would be around 13km ish
[18:12] <hibby> i might have a graph for that :)
[18:12] <nato> right. it's hard to tell on the other weather data, but it does look like there is a temperature min at around 12 or 13 km
[18:12] <hibby> nato: first comment on your blog
[18:13] <hibby> label your graph's axes
[18:13] <hibby> what is that first graph - temp vs altitude?
[18:13] <nato> hibby: heh, thanks, will do
[18:13] <hibby> altitude should be on the x-axis also, as it's the independant variable, but I'm an engineer
[18:13] <cuddykid> yeh, echo that from hibby! Took me a while to figure out what was going on :P
[18:14] <nato> hibby: I only plotted it that way to agree with the standard altitude vs temp plots for the atmosphere.
[18:15] <nato> I've seen a number of other plots from balloon flights showing the min temp at above 15km
[18:15] <hibby> fairynuff. Can't say I've seen them, but all our student groups last year had their altitude on x-axis and suchlike ;)
[18:15] <nato> is it more common at ~ 10, then?
[18:15] <hibby> see: http://sunset-skypod.co.uk/
[18:16] <hibby> there should be analysis on there too
[18:16] <hibby> with graphs to compare with :)
[18:17] <cuddykid> nato: http://www.aerospaceweb.org/question/atmosphere/atmosphere/layers.gif
[18:17] <cuddykid> can vary between ~10km and ~18ish km
[18:18] <nato> Cuddykid: that's the kind of graph I was trying to reproduce.
[18:18] <cuddykid> I think you've definitely done well
[18:18] <cuddykid> which manufacturer of balloon was it?
[18:18] <nato> so, I'm sure I accurately measured my initial lift and weight. I wonder if I had a leak?
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[18:18] <cuddykid> if it's the mysterious Hwoyee then it could well be correct
[18:19] <nato> it was a kaymont
[18:19] <cuddykid> ohh, hmm
[18:20] <jcoxon> evening
[18:24] <nato> cuddykid, hibby: on the plot, I included sounding data. Particularly the green plot shows an inflection at about 12 km, but the min at around 17 km. What do you make of that?
[18:25] <hibby> potentially solar radiation and atmospheric thickness playing with each other?
[18:25] <hibby> or a warm wind.
[18:25] <nato> which point is more likely to correspond to my min?
[18:26] <hibby> couldn't tell you off the top of my head, sadly.
[18:26] <nato> It looks to me like the real min in those data are around 17km
[18:27] <hibby> what be the reds?
[18:27] <nato> hibby: that is sounding data from a different airport.
[18:27] <hibby> ... how did you know the altitude?
[18:28] <cuddykid> hi jcoxon
[18:28] <jcoxon> hi cuddykid
[18:29] <nato> Hibby: the altitude is only an estimate from the predicted ascent rate (nozzle lift and payload weight) and the flight time.
[18:29] <cuddykid> nato: what's the difference between red and greens? On the blog it says they're both from airports
[18:30] <nato> Yes, they are both from different airports, separated by about 80 miles.
[18:30] <hibby> aha. hence the unsure-ness about the minimum. You can probably run some maths through it and get a closer approximation based on the pressure compared to the standard model.
[18:30] <cuddykid> oh right, I see
[18:31] <number10> saw your pictures of payload thismorning jcoxon. Do you put it in a plastic bag?
[18:31] <hibby> I've got an equation for that kicking abou
[18:31] <jcoxon> number10, bubble wrap
[18:31] <nato> The standard model I found was really simplified just a linear decrease, then a constant temp, followed by a linear increase.
[18:31] <hibby> however it doesn't take into account the effects of sensor error, which we found to be very significant above 15k
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[18:33] <cuddykid> nato: cross referencing your data vs airports I think&. your data should follow the airports data more closely. I can see what looks to be 2 mins from airport data (~12km and ~17km), now, looking at your data I think you're min aligns to ~12km and then there is a local min around ~23km (yours) which should align to ~17km
[18:33] <nato> hibby: I think my sensor probably had significant error. But I would think that the profile should still be correct.
[18:33] <hibby> nato: how does it compare to graphs 6,7,8 on this page: http://personal.strath.ac.uk/james.tosh/launchanalysis.html
[18:34] <jcoxon> number10, whats the wind like up in suffolk?
[18:34] <nato> Hibby: those plots show a min at around 12km
[18:35] <cuddykid> yep, on the graph hibby linked too, their min is around 12km
[18:35] <number10> jcoxon: not bad at all at the moment - has died down quite a lot
[18:35] <nato> hibby, cuddykid: I do see that qualitatively, the data is similar. It's fairly smooth up to the min, then gets very "noisy" at the temperature increases.
[18:36] <jcoxon> thats my only concern about launching
[18:36] <jcoxon> too much wind might damage the balloon at launch
[18:37] <number10> forcasts still variable
[18:37] <jcoxon> yeah
[18:37] <nato> The plots on this site indicate around 17km: http://www.natrium42.com/halo/flight2/
[18:37] <jcoxon> bbc says calmer then accuweather
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[18:39] <cuddykid> hmm - can anyone shed some light on this - looking to buy 2mm carbon rods - ebay person says they come "coiled" in a box, didn't realise they would be that easy to "coil" - if so, defeats whole object of trying to strengthen wing
[18:39] <nato> On this site, it's about 15km http://ve5aa.dyndns.org/balloon/sabre_7.html
[18:39] <number10> grib data showing 15-17knots for sat 1500
[18:40] <number10> but up to 28 knots over channel
[18:40] <nato> cuddykid: are you working on a balloon-launched glider?
[18:40] <cuddykid> nato: yup :)
[18:41] <jcoxon> number10, Sunday will be back up
[18:41] <jcoxon> as it looks a little better then
[18:41] <nato> cuddykid: cool. That's my goal as well.
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[18:41] Nick change: joph_ -> joph
[18:42] <nato> cuddykid: do you have any of your ideas/progress posted somewhere?
[18:42] <cuddykid> nato: awesome, I've been taking guidance from gpsboomerang, W0OTM's glider and the people in Canada
[18:42] <cuddykid> got some photos posted on flikr
[18:42] <number10> yes, but I think its one of those times where predictions change every 24h
[18:42] <cuddykid> I'll get them for you
[18:42] <nato> cuddykid: that's funny.GPSboomerang is also my starting point.
[18:42] <cuddykid> nato: http://flic.kr/s/aHsjxDFm3K
[18:43] <number10> looking like 9-10 on sunday
[18:43] <cuddykid> nato: my original idea was to just fly the thing just controlled via rudder, however I'm becoming increasingly swayed to include active stabilisation via an IMU etc
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[18:44] <nato> cuddykid: I'm still planning on no active stabilization. Is that your glider? looks good!
[18:45] <cuddykid> nato: yup, thanks :) built it in the past 2 weeks, still a long long way to go :P have some plastic stuff coming early next week so I can mould it around nose and body
[18:45] <nato> also, are you planning on any elevator control? I plan to have it in the testing stages, but in the end I plan to use a fixed glide ratio.
[18:45] <cuddykid> nato: if I use IMU then yes, but atm no plans
[18:46] <nato> cuddykid: my current plan is for gps and probably a gyro for navigation only.
[18:46] <cuddykid> the autopilot I'm coding is only going to "attempt" to make it to destination
[18:47] <nato> yea, that's my plan as well.
[18:47] <cuddykid> I considered compass, but just going to roll with gps bearing I think
[18:48] <nato> I'm only planning on a gyro because I've had some experience with it, and it will stabilize my flight path (making the gps heading more accurate)
[18:50] <nato> cuddykid: what is your wingspan? it looks like gpsboomerang is around 25". Also, what is your target weight?
[18:51] <cuddykid> nato: approx 0.8m target weight is around 1.5kg (including tech stuff)
[18:52] <nato> do you plan to have any active heating? I keep wondering about the servo and gps. my current plan is to heat them.
[18:53] <cuddykid> no, gps will work fine - only concern is the g forces - but on last balloon flight worked a treat
[18:53] <cuddykid> as for servo, it's going to be continually running even on ascent so should be fine
[18:54] <nato> have you decided on a cut-down method?
[18:54] <cuddykid> yeah will be a nichrome wire device
[18:56] <nato> cuddykid: what did you use to cut your foam?
[18:57] <cuddykid> for most of it just a kitchen knife
[18:58] <nato> good work, then! I will be attempting to use a hotwire.
[18:59] <nato> you didn't cut the wing with a knife, though, right?
[18:59] <cuddykid> sanded
[19:01] <nato> cool. So, are you still considering self-stabilization, or are you set on using an IMU? If so, why?
[19:09] Nick change: AndChat| -> NigeyMoby
[19:09] <cuddykid> just going to see how test flights go - if incredibly unstable and all my attempts to stabilise fail, then I'll deploy an IMU and servos for ailerons/elevators
[19:09] <cuddykid> and have another chip which just manages stability
[19:15] <cuddykid> that reminds me, I must order some atmegas
[19:35] <priyesh> can anyone recommend a gerber viewer for windows (apart from GERBV)
[19:37] <NigeyMoby> try viewmate
[19:37] <nosebleedKT> Hi all
[19:37] <priyesh> NigeyMoby: thanks, wil try now
[19:38] <NigeyMoby> :)
[19:38] <nosebleedKT> I said hello
[19:38] <nosebleedKT> be social
[19:38] <nosebleedKT> :P
[19:42] <number10> ello
[19:42] <nosebleedKT> http://www.youtube.com/watch?feature=player_embedded&v=1plg_yYsCQM
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[19:46] <Laurenceb__> sup
[19:47] Nick change: Laurenceb__ -> Laurenceb_
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[19:56] Action: Laurenceb_ has worked out how the omron m2 blood pressure sensor circuit works
[19:57] <SpeedEvil> Does it cut the hand off, and then measure teh altitude of the blood?
[19:57] <Laurenceb_> uses a vreg as an adjustable current source
[19:57] <Laurenceb_> thats what
[19:57] <Laurenceb_> its quite clever
[19:57] <SpeedEvil> you mean a blood pressure cuff thing?
[19:57] <Laurenceb_> yes
[19:57] <SpeedEvil> ah
[19:58] <Laurenceb_> i couldnt work out how they drove the pressure sensor with two vregs an 8 bit micro and an inst amp
[19:58] Action: SpeedEvil is annoyed that HRMs are not cheap.
[19:58] <SpeedEvil> I kinda want a 24*7 HRM, so I have a betted handle on exertion for diet purposes.
[19:58] <Laurenceb_> the whole analogue gnd rail is floating a few hundered mv off actual gnd
[19:58] <Laurenceb_> fair enough
[19:59] <SpeedEvil> Cost engineering is fun.
[19:59] <Laurenceb_> they can disable to vreg as well for "sleep" mode
[19:59] <Laurenceb_> *the
[20:00] <Laurenceb_> whole board is just an lqfp64 8 bit micro, two sot vregs, a couple of sot fets, pressure sensor and inst amp
[20:00] <Laurenceb_> probably ~$4 or so
[20:00] <SpeedEvil> Is this a commercial, or medical one?
[20:02] <Laurenceb_> commercial
[20:03] <Laurenceb_> lloyds pharmacy
[20:03] <Laurenceb_> £14.80
[20:03] <SpeedEvil> I have one or two of possibly similar ones from LiDl
[20:04] <Laurenceb_> its an omron M2
[20:04] <SpeedEvil> Several years old
[20:05] <Hiena> Laurenceb_: Is it a bridge type pressure sensor?
[20:05] <Hiena> 4 vire isn't it?
[20:16] <Laurenceb_> yes
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[20:38] <Laurenceb_> Hiena: do you know why some bridge sensors recommend constant current operation?
[20:39] <Laurenceb_> http://uk.mouser.com/omron2smpp/
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[20:45] SolarNRG (SolarNRG@94-195-174-233.zone9.bethere.co.uk) joined #highaltitude.
[20:45] <SolarNRG> Hi does anyone here know anything about making aluminium Lithium alloys?
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[20:50] <Laurenceb_> http://www.mclarenelectronics.com/Products/Product/CIU-100
[20:50] <Laurenceb_> Operating temperature -400C to +850C
[20:50] <Laurenceb_> pmsl
[20:56] <navrac_> if mclaren say it, it must be true . Absolute zero is obviously wrong
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[20:57] <fsphil-laptop> the law of thermodynamics is now just a suggestion
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[21:05] <navrac_> the guidance note of thermodynamics
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[21:28] <Laurenceb_> Hiena: ping
[21:28] <Laurenceb_> have you worked with diff pressure sensors before?
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[22:34] <Lunar_Lander> hello people
[22:34] <Lunar_Lander> fsphil news from Raul
[22:34] <Lunar_Lander> he's back home and all right
[22:34] <Lunar_Lander> he will upload the balloon video soon
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[22:36] <fsphil-laptop> yays
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[22:44] <Lunar_Lander> :)
[22:44] <Lunar_Lander> and as I said the cylinders had been returned on January 2
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[23:04] <Raul_> Hello, back home
[23:04] <Raul_> any idea where I can upload 40gb of movie for free?
[23:06] <Laurenceb_> pornhub?
[23:07] <Laurenceb_> redtube?
[23:07] <SparxEtch> ...haha
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[23:10] <zyp> I'd just make a torrent
[23:11] <SpeedEvil> torrents don't work unless you have several seeders
[23:12] <SpeedEvil> also - how the hell did you capture 40G of video?
[23:15] <Raul_> the 2:20 h flight is 16gb
[23:16] <Raul_> I also have more of traveling to Germany and building the payload
[23:17] <BrainDamage> SpeedEvil: zooming lens assembly over a women's changing room
[23:26] <zyp> SpeedEvil, sure they do
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[00:00] --- Fri Jan 6 2012