highaltitude.log.20120430

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[03:52] <griffonbot> Received email: navrac "Re: [UKHAS] Fw: [amsat-bb] USNA Party Balloon Success!"
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[05:52] <griffonbot> Received email: "Re: [UKHAS] Fw: [amsat-bb] USNA Party Balloon Success!"
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[06:56] <mrmodesty> hi guys
[06:58] <mrmodesty> anyone that can help me with RTTY transmission and Arduino? Like done by AVA
[07:01] <UpuWork> morning mrmodesty
[07:02] <UpuWork> whats the issue you're having ?
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[07:02] <mrmodesty> morning you
[07:03] <UpuWork> and what time zone are you in ? :)
[07:03] <mrmodesty> italy :)
[07:03] <UpuWork> ah good morning then :)
[07:04] <mrmodesty> so, my problem is on the receiver side. Waterfall is not as expected
[07:04] <mrmodesty> I've the two carriers
[07:04] <UpuWork> screen shot pls
[07:06] <mrmodesty> sorry I can't do that now. I'm at work. I don't have all the stuffs with me :(
[07:06] <UpuWork> ok not a problem
[07:06] <UpuWork> well come back this evening and we'll get it sorted
[07:06] <UpuWork> so you have 2 lines on the water fall ?
[07:07] <mrmodesty> yes but one of them is not "well defined". sorry for the way I try to explain :)
[07:08] <mrmodesty> so I can't decode
[07:08] <mrmodesty> same setup works well with "traditional" RTTY
[07:08] <mrmodesty> maybe somwthing wrong on the Arduino
[07:12] <UpuWork> possibly
[07:12] <UpuWork> when your home
[07:12] <UpuWork> get it going and come have a chat
[07:13] <mrmodesty> sure
[07:13] <UpuWork> did you follow this guide : http://ukhas.org.uk/guides:linkingarduinotontx2
[07:13] <UpuWork> ?
[07:13] <mrmodesty> yep
[07:13] <UpuWork> yeah it works sure we can work out what it is
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[07:13] <mrmodesty> do you think I must use 1% resistors?
[07:14] Nick change: marco -> Guest52571
[07:14] <UpuWork> no
[07:14] <UpuWork> 1 sec just going to disconnect back in 5
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[07:18] <UpuWork> back
[07:19] <UpuWork> the resistor accuracy would just affect the shift
[07:19] <mrmodesty> that's what I thought
[07:19] <mrmodesty> anyway
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[07:20] <UpuWork-> hmm
[07:20] <mrmodesty> I'll be back later
[07:20] <UpuWork-> speak then
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[07:20] Nick change: UpuWork- -> UpuWork
[07:21] <mrmodesty> hard to do anything without all the stuffs :)
[07:21] <UpuWork> it is
[07:21] <UpuWork> but those instructions should work fine but its easier if we can see what it is
[07:22] <mrmodesty> sure
[07:22] <number10> Hi UpuWork is there a link to the launch calendar - or is it something that you need to install google calendar app?
[07:24] <UpuWork> hey number10 not sure I've not used it yet
[07:24] <number10> ok, np
[07:26] <mrmodesty> thx UpuWork, back to you later
[07:27] <UpuWork> no problems have a good day
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[07:33] <number10> hows the advance course going UpuWork ?
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[07:58] <UpuWork> slow number10 :)
[07:59] <number10> :) when is exam?
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[08:06] <UpuWork> end of June
[08:06] <UpuWork> err
[08:06] <UpuWork> May
[08:08] <number10> not long then - youll be ok
[08:08] <number10> morning daveake - predictions not looking good still
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[08:11] <daveake> rather variable and frequently wet
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[09:53] <gonzo_> morning peeps
[09:53] <jcoxon> morning gonzo_
[09:55] <gonzo_> what a bloody nasty weekend, no wonder there were launch cancellations
[09:55] <gonzo_> where I was you needed 4wd to get through the floods on the lanes
[09:56] <jcoxon> yeah, not terribly nice
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[11:01] <navrac> Typical it's sunny today - perfect balloon launching weather here
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[11:07] <fsphil> we finally got the rain last night
[11:13] <navrac> the rain finally stopped today - although apparently the rain is back for the rest of the week. Sadly I can't launch today as 1) I used all my lithiums in my guitar pedal and 2) this is a military training area so I can only launch at weekends
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[14:11] <Jonititan> Hello
[14:12] <UpuWork> afternoon
[14:15] <Jonititan> I'm making payload module for an amateur rocket. I'm hoping to be able to use the payload on a balloon as well. Any features I should in include?
[14:18] <Jonititan> I've already included an MPU-6000 as the gyro/accelerometer I've selected a good altimeter and a magnetic compass and I've got an NTX2
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[14:18] <NigeyS> gps ?
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[14:20] <Jonititan> Well for the rocket it's not very useful. The refresh rate is too low. Maybe as an add on. I'm looking more for sensor ideas rather than guidance.
[14:20] <NigeyS> well for a balloon ure going to need gps
[14:20] <NigeyS> or how are you going to track it ?
[14:21] <Jonititan> I will add GPS but probably as a daughter board.
[14:21] <NigeyS> ahh, then thats ok, i'd recommend a ublox6
[14:21] <UpuWork> GPS can go at 1Hz
[14:21] <UpuWork> useful for recovery
[14:21] <NigeyS> iirc ublox 6 gps is going on a rocket CUSF are launching this week, so the refresh would be ok
[14:22] <fsphil> unless you're going super sonic :)
[14:23] <fsphil> oh wait, the ublox can do that as long as it's not above 15km
[14:23] <NigeyS> :o really ?
[14:23] <UpuWork> yeah
[14:23] <NigeyS> hah thats mental
[14:23] <UpuWork> 500 knots OR altitude
[14:23] <gonzo_> we used to put a deployable nose-cone on our rockets, with it's own chute and a 2.4GHz video camera in. Made some excellent footage.
[14:23] <fsphil> well, AND
[14:23] <UpuWork> or is it AND
[14:23] <UpuWork> AND
[14:23] <UpuWork> :)
[14:24] <gonzo_> but you can get smaller lighter key fob cams mow
[14:24] <fsphil> there is something cool about live video/images :)
[14:24] <gonzo_> I agree phil
[14:24] <Jonititan> Well the rocket bit board has to activate pyro's for the parachutes and the GPS is to slow to assist in azimuth detection.
[14:24] <UpuWork> Let me know if you are interested in some GPS modules
[14:25] <Jonititan> So does the ublox work above 15km then?
[14:25] <UpuWork> yes in flight mode
[14:25] <UpuWork> 50km
[14:25] <UpuWork> max
[14:25] <gonzo_> I did start building a low tech accelerometer for ours. A strobe and film camera, then launch at night with the shutter held open.
[14:26] <UpuWork> whats your microcontroller Jonititan ?
[14:26] <fsphil> neat
[14:26] <gonzo_> sort of the old physics demo of a ticker tape
[14:26] <Jonititan> Pic24f
[14:26] <UpuWork> 3.3V ?
[14:27] <Jonititan> Yes
[14:27] <UpuWork> http://ava.upuaut.net/store/index.php?route=product/category&path=59_60 either of those
[14:27] <UpuWork> probably the Sarantel antenna for a dynamic enviroment
[14:29] <Jonititan> Personally I'd prefer to make my own daughter board. I'll have a look at the chip being used there though. Thanks
[14:30] <UpuWork> no problems the chip is for sale on the site too with Eagle CAD schematics if you need
[14:31] <Jonititan> Yup found it. So any ideas for cool science packages? I've been thinking about a sun tracker using photo transistors.
[14:33] <UpuWork> how long are you planning on being up ? :)
[14:35] <Jonititan> I'm not sure for the balloon. The sun tracker is more an idea for the rocket. How long can balloons stay up? I suppose it's dependent on a lot of things.
[14:37] <fsphil> most flight a few hours
[14:37] <fsphil> but they can often be longer, sometimes unintentionally
[14:37] <NigeyS> if you get an unitentional floater could be a few days
[14:37] <fsphil> the longest is just over 3 days I think?
[14:37] <fsphil> but that's fairly exceptional
[14:40] <Jonititan> What altitude do they tend to float at? If high enough then perhaps could try doing some sort of star sighting? Maybe try a bit of astro navigation?
[14:41] <NigeyS> depends on size of the balloon, and the fill, but between 27km and 41km
[14:43] <Jonititan> Does anyone have video from a camera pointing up on those flights? Or slanted around the balloon?
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[14:46] <fsphil> there are some videos pointing up
[14:46] <fsphil> and some pretty amazing burst videos
[14:48] <Jonititan> Maybe a camera with a wide angle lenses could be used to try star sighting? Has it been tried using recovered video?
[14:49] <fsphil> venus and the moon are regularly spotted, but stars are too faint
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[14:49] <fsphil> the problem is the sun gets in the way
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[14:49] <fsphil> the sun or the earth, both are very bright during the day
[14:49] <Jonititan> Is it a glare issue?
[14:50] <fsphil> yea
[14:50] <fsphil> at the exposure time you'd need to see stars, the sun and the earth would pretty much wipe out the image
[14:50] <fsphil> also motion of the payload would blur the stars
[14:50] <daveake> yep
[14:51] <fsphil> you'd need a stable platform, and some way to shield the sun and ground from the camera
[14:52] <Jonititan> That's something I've been wondering about with CMOS video. Is there an exposure time? If it's a global shutter then couldn't machine vision be used to identify them?
[14:53] <daveake> Moon isn't a problem - e.g. http://www.flickr.com/photos/daveake/6825845291/in/set-72157629187109165/lightbox/ And in one shot at least I got Venus (I think) but that was pretty much just a single pixel
[14:53] <Jonititan> Dependent on frame rate vs rotation speed.
[14:54] <fsphil> cmos cameras usually have a rolling shutter
[14:54] <r2x0t> light intensifier / night vision with camera pointed up would be interesting for night launch
[14:55] <Jonititan> Oh it's ccd that has global isn't it.
[14:55] <fsphil> yea r2x0t, no light pollution up there
[14:56] <gonzo_> the platform should be stable enough at the higher alts?
[14:56] <Jonititan> Has anyone used a CMOS camera with a visible light filter so you can see near infared?
[14:57] <r2x0t> CMOS cameras usually have IR blocking filter on CMOS chip
[14:57] <r2x0t> you have to first remove it, then add visible light filter...
[14:57] <fsphil> IR imaging would be nice, it shouldn't have the haze problem that visible images have
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[14:58] <Jonititan> Yup I've seen it done a lot with webcams to make cheap night vision
[14:58] <r2x0t> if you just add vis blocking filter, you would need shutter times in seconds... impossible on baloon
[14:59] <Jonititan> Is that for stills or video though?
[14:59] <r2x0t> I'm talking from experience with IR filters for photography
[14:59] <r2x0t> for view, they are unusable
[14:59] <r2x0t> *video
[15:00] <r2x0t> only way is to convert the camera to IR
[15:00] <daveake> e.g. - http://www.ebay.co.uk/itm/10MP-Infrared-IR-FULL-SPECTRUM-Capable-Digital-Camera-Canon-A480-Powershot-/130685752549?pt=UK_CamerasPhoto_DigitalCameras_DigitalCameras_JN&hash=item1e6d7a54e5#ht_7070wt_1139
[15:00] <Jonititan> Yes to replace the ir filter with a visible filter.
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[15:05] <Jonititan> I've got the perfect candidate in mind right now for conversion so I think I'll probably give that a go.
[15:05] <Jonititan> Any other science experiment ideas?
[15:07] <fsphil> biological sampling :)
[15:09] <Jonititan> I'll leave that to those fascinated by squishy things.
[15:10] <fsphil> haha
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[15:22] <gonzo_> squishy things are nice, but usually results in getting a slap
[15:24] <Jonititan> Gtg
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[15:56] <Jonititan> So none has taken infrared video from a hab before then?
[15:56] <kokey> not a bad idea
[15:57] <kokey> I suppose you could gut the IR filter out of an old Canon IXUS
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[15:58] <kokey> or powershot
[15:58] <Jonititan> Yes and replace it with a visible light filter
[15:58] <kokey> and take RAW images
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[15:59] <daveake> You can buy them modified or DIY see http://www.opticsgeek.com/page6/products.html
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[15:59] <kokey> I guess if you had accurate orientation data you could build a nice UV map
[16:00] <kokey> but my brain is exploding a little bit trying to think of how to code that
[16:00] <kokey> (especially after a day of coding cfengine promises)
[16:00] <Jonititan> UV? Infrared surely?
[16:00] <kokey> I mean IR map, whoops
[16:00] <Jonititan> Coding to save raw images?
[16:01] <kokey> no, coding to combine the images with orientation data to fit them together
[16:01] <kokey> saving RAW images should be pretty straightforward with CHDK
[16:01] <gonzo_> if you have accel and compass, you could use a simple detector and pin hole lens and use the swinging of the payload to do the scanning fior you
[16:02] <kokey> gonzo_: yup, what I was thinking
[16:02] <gonzo_> pin hole lens works well at thermal
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[16:02] <Jonititan> Just a matter of syncing position and pictures
[16:03] <gonzo_> I saw a design for a military IR cam, with a pin hole cam and a scakking mirror in front
[16:03] <gonzo_> scanning
[16:03] <Jonititan> Using a galvanometer to move the mirror I expect.
[16:04] <kokey> yeah, it's the synching position and pictures part that I can't quite figure out yet
[16:04] <Jonititan> Oops try
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[16:04] <kokey> /quit
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[16:06] <kokey> I should start an open source project called /quit (e.g. github.com/slashquit) as a little prank on freenode
[16:06] <kokey> perhaps a kind of vapourware that gets a lot of buzz
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[16:10] <mfa298> kokey: the other one I've heard is to tell people they get a good party if they type /disco
[16:12] <fsphil> kokey, I've been thinking about how to project images from a balloon onto a sphere to get a map. it's fairly simple idea that imagine would be hideous to program
[16:12] <fsphil> I'm sure NASA has done this kind of stuff before though, wonder if they've published any of it
[16:15] <r2x0t> another crazy idea for night launch: use bright LED or laser to shine at baloon, keyed by CW telemetry... then use telescope to try and read it from some distance
[16:22] <kokey> r2x0t: yeah I've also been thinking about lasers
[16:22] <kokey> e.g. I'm sure if you have a controlled green laser you can probably send data to a payload
[16:23] <kokey> I guess you could also read the green wavelength
[16:23] <kokey> that's reflected
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[16:24] <kokey> fsphil: yeah, that's stuff's not easy, and it's not like 3D programming is new or anything
[16:25] <kokey> that said, there's a lot of software about dealing with that, I'm just not up to date with it
[16:28] <SpeedEvil> fsphil: #openstreetmap
[16:28] <SpeedEvil> georectification
[16:28] <SpeedEvil> over on irc.oftc.net
[16:28] <SpeedEvil> You need a terrain model, or more freedom
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[18:10] <nosebleedkt> yoo! I just spoke with the civil aviation offices
[18:10] <nosebleedkt> or how it is called
[18:10] <nosebleedkt> :P
[18:12] <nosebleedkt> I will from there to show them what is about because they have no idea
[18:12] <cuddykid> where are you located nosebleedkt ?
[18:13] <nosebleedkt> in the land of all debt :(
[18:13] <nosebleedkt> its called greece :p
[18:13] <cuddykid> ahh :P
[18:13] <cuddykid> haha
[18:14] <cuddykid> nice and sunny/hot though, unlike the UK most of the time :D
[18:14] <nosebleedkt> they found huge oil sources and other resources and now the big fish is gonna the small :)
[18:14] <cuddykid> here we operate a one nice day for 2 weeks of horrendous rain/cold weather policy :D
[18:14] <nosebleedkt> gonna eat*
[18:14] <nosebleedkt> lol cuddykid, thats why i dont like north countries
[18:15] <nosebleedkt> i will have headache every 2 hrs there :)
[18:24] <cuddykid> yes, I don't like them either!
[18:25] <fsphil> I like it, the weather is interesting a lot of the time
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[18:29] <nosebleedkt> fsphil
[18:30] <nosebleedkt> do u get your notams approved easily?
[18:36] <LazyLeopard> fsphil: There's interestig and interesting... ;)
[18:37] <SpeedEvil> http://www.spacex.com/webcast.php
[18:38] <SpeedEvil> Full power static test at 8pm
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[18:46] <Martin100_> icarus apparently in the air on the tracker, no freq and only one Rx
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[18:52] <r2x0t> icarus
[18:52] <r2x0t> Time: 2012-04-30 09:46:13
[18:52] <r2x0t> that's rather old data
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[18:54] <Martin100_> r2xot, it is a bit old, guess its a sim?
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[18:58] <Upu> Martin100_ Rob's (M0RJX) has been doing some teacher training this week on launching balloons for schooles
[18:58] <Upu> which is probably what its about
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[18:59] <Martin100_> @upu is there spelling lessons too?
[18:59] <F6AGV> hello good evening
[18:59] <Upu> yeah yeah :P
[18:59] <Upu> evening F6AGV
[18:59] <daveake> s/is/Are/
[18:59] <Martin100_> :)
[19:00] <F6AGV> evening to you UPU
[19:00] <Martin100_> s dividied by is divided by Are ?
[19:00] <SpeedEvil> Cound hold
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[19:00] <daveake> divididided??
[19:00] <Martin100_> = 42?
[19:00] <F6AGV> no question just I say good evening
[19:01] <Martin100_> if you had eyesight like me you'd not type this good
[19:02] <F6AGV> weather is special with a small tornado in south of Toulouse
[19:02] <number10> hi F6AGV
[19:03] <F6AGV> Yes strange WX, here sky is black !
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[19:04] <F6AGV> see the wx viewer http://www.sat24.fr/
[19:05] <F6AGV> sorry www.sat24.com
[19:06] <Upu> look at that south of Eire and off the cornwall coast
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[19:06] <number10> I dont like the look of the weather lately - not good for balloons :(
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[19:07] <fsphil> Upu, it's even more dramatic in visible light
[19:08] <F6AGV> clouds are coming from North East Algeria to South of France ! Very strange indeed.
[19:08] <fsphil> we've been so lucky here so far. the weather has been really sunny, although a bit cold
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[19:09] <F6AGV> Yes not good for ballooning !
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[19:10] <staylo> Ah, so *that's* why they call it a static test
[19:10] <Upu> ooh yeah fsphil
[19:11] <F6AGV> Bye good night all
[19:12] <Upu> bon soir
[19:12] <F6AGV> faites de beaux rĂªves
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[19:13] <Upu> lol
[19:13] <Upu> "sweet dreams"
[19:14] <RocketBoy> upu - did you do any tracking of the mondo flights the other day?\
[19:14] <RocketBoy> ?
[19:15] <Upu> day you did the altitude ?
[19:15] <Upu> if so yes I tracked Mondo2
[19:15] <RocketBoy> yep
[19:16] <RocketBoy> how did you find .225 / .375 / .525 - for background noise?
[19:16] <Upu> all good
[19:16] <Upu> however the modules Mick was using
[19:16] <Upu> not so good
[19:16] <RocketBoy> just wondering what to use if i cant use .650/.075/.200
[19:16] <RocketBoy> on saturday
[19:16] <Upu> 200 is good
[19:17] <RocketBoy> ah
[19:17] <RocketBoy> yeah - think its being used
[19:17] <Upu> I don't know how to describe it
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[19:17] <daveake> Steve I can bring an rfm22b tracker and that's settable in software
[19:17] <Upu> but the transmissions were alot more "splashy" that the NTX2
[19:17] <fsphil> yea, there's a lot of noise in the signal
[19:18] <Upu> your NTX2 despite being much weaker had more clarity
[19:18] <fsphil> and it just flat out crapped itself after burst
[19:18] <Upu> oh yeah
[19:18] <Upu> it just exploded
[19:18] <RocketBoy> yeah - i can set the frequency too - just wondering whats known good to use
[19:18] <daveake> "bring" as in "I can build one before then" :)
[19:18] <fsphil> and would sometimes randomly jump frequency
[19:18] <Upu> why not detune an NTX2 ?
[19:19] <daveake> could do. how much can they be shifted by?
[19:19] <Upu> 15khz ?
[19:19] <daveake> I have a couple of NTX2 trackers already built so that would save a bit of work
[19:19] <Upu> but you don't want to go that far
[19:20] <daveake> If it's "just" the 3 flights (Steve + Dave#10 + me) during Saturday morning, then we can run .650, .075 and .200
[19:21] <daveake> In which case we just fight over who has which :D
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[19:22] <Upu> evening Dan-K2VOL
[19:23] <Upu> hey Dan-K2VOL you asked about using the ICSP programmer with Arduino 1.0
[19:23] <Upu> File->Upload Using Programmer
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[20:10] <daveake> SpaceX countdown restarted, T-5 mins, for their engine test
[20:17] <stilldavid> somewhat anticlimactic
[20:17] <daveake> Indeed. I'm overwhelmed with "was that it?"
[20:18] <stilldavid> "Test complete, thank you for viewing"
[20:18] <stilldavid> glad they told us :\ very cool though
[20:18] <SpeedEvil> :)
[20:18] <daveake> I thought "Oh, they stopped it"
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[20:22] <LazyLeopard> Hmmm... One of those "Good, it fires" tests, I guess.
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[20:25] <stilldavid> http://spaceflightnow.com/falcon9/003/status.html
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[20:28] <Lunar_Lander_> hello
[20:29] <staylo> Not as anticlimactic as the Ares I test where they had to pause to send someone up to the top of the gantry to pull a cover off the nose :)
[20:29] <daveake> " Falcon 9 engines reached full thrust for two seconds, deeming today's static fire a success."
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[20:29] <Lunar_Lander_> ROFL
[20:30] <Lunar_Lander_> just today I read that a F9 costs about 110 million USD
[20:30] <daveake> "Yes dear, 2 seconds is plenty of time"
[20:30] <Lunar_Lander_> more expensive then an Ariane 5
[20:31] <fsphil> if we all donated 1 million USD we could buy ourselves a launch :)
[20:31] <stilldavid> so it still blows my mind that SpaceX has spent ~$800M USD since it was started
[20:31] <stilldavid> and Facebook just bought instagram for $200M more than that
[20:32] <fsphil> stilldavid, there is no logic to facebookagram
[20:32] <Randomskk> facebook bought instagram with mostly facebook shares
[20:32] <stilldavid> $33 per user? and, what, something like 16 employees in the company? they could have a damn *space program*
[20:32] <stilldavid> and be *profitable*
[20:32] <Randomskk> spaceX has spent actual cash
[20:32] <stilldavid> at any rate.
[20:32] <fsphil> if spock where here, he's sum it up as "Fascinating"
[20:33] <Randomskk> $33 a user isn't unusual for tech acquisitions either
[20:33] <Randomskk> and especially if twitter's about to buy them and facebook really don't want twitter to own it
[20:33] <Randomskk> I mean, don't get me wrong! it's still a ton of money
[20:33] <Randomskk> and better spent on a space program
[20:34] <stilldavid> perspective is just a funny thing sometimes
[20:34] <Randomskk> looking forward to planetary resources too
[20:34] <fsphil> I wonder if I can sell them my live images page for a few million
[20:35] <daveake> HABagram
[20:35] <fsphil> ooh
[20:35] <Randomskk> lol
[20:35] <daveake> I want 10% for that :D
[20:36] <fsphil> what I dont understand is that facebook could have employed a few people just to make the same service
[20:36] <Randomskk> users
[20:36] <Randomskk> or rather, stopping twitter getting the users
[20:37] <fsphil> most of them are probably already on facebook anyway
[20:37] <Randomskk> not really the point
[20:37] <Randomskk> most of them are probably on twitter too
[20:37] <Randomskk> but they /use/ instagram
[20:37] <Randomskk> they like it, they spend time with it, they talk it up, all that
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[20:41] <fsphil> it's all very silly really
[20:42] <Lunar_Lander_> yea
[20:42] <Lunar_Lander_> do you want to hear a good news?
[20:42] <Upu> do I need popcorn ?
[20:42] <daveake> and candy floss
[20:42] <Lunar_Lander_> xD
[20:42] <Lunar_Lander_> candy floss?
[20:43] <Upu> https://www.google.co.uk/search?hl=en&rlz=&q=candy+floss&um=1&ie=UTF-8&tbm=isch&source=og&sa=N&tab=wi&ei=VvmeT6WiD8mFhQes7cCBDw&biw=1680&bih=900&sei=WfmeT6jWDo-7hAfs9e3lDg
[20:43] <Lunar_Lander_> ah
[20:43] <Upu> http://moblog.net/media/l/u/p/lupaloo/candy-floss-pink.jpg
[20:43] <Upu> some humans should be shot
[20:43] <Lunar_Lander_> I build up a circuit with 4 energizer ultimate lithium and my NiCr wire and the MOSFET
[20:43] <Lunar_Lander_> and had 3 alkaline batteries to simulate the arduino
[20:43] <SpeedEvil> Upu - does it bother the dog?
[20:44] <SpeedEvil> If not - who cares.
[20:44] <Lunar_Lander_> I wired everything up and then connected the 3 batts to the Gate, wire lighted up
[20:44] <Lunar_Lander_> pulled the wire, NiCr stopped glowing
[20:44] <SpeedEvil> rimming dogs is already quite unnatural.
[20:44] <SpeedEvil> trimming
[20:44] <jdtanner> cool
[20:44] <daveake> rimming?
[20:44] <daveake> lol
[20:44] <fsphil> yikes
[20:44] <jdtanner> the wire :P
[20:44] <Upu> well yes it can cause dermatitis and skin problems also, and this comes from me, its pink. You don't find pink dogs in nature
[20:44] <Upu> lol
[20:44] <Lunar_Lander_> ROFL
[20:45] <daveake> poodle in spaaaaaace
[20:45] <fsphil> so yea, swiftly moving on
[20:45] <fsphil> nice job Lunar_Lander_
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[20:45] <Lunar_Lander_> thanks
[20:45] <jdtanner> yes, v.nice
[20:45] <SpeedEvil> Pink dye on a white dog can be very benign dye
[20:45] <Lunar_Lander_> ohhh
[20:45] <Lunar_Lander_> nigelvh, you missed the story
[20:45] <SpeedEvil> Food colouring would work.
[20:45] <fsphil> you've re-invented the light bulb :)
[20:45] <Lunar_Lander_> xD
[20:45] <nigelvh> Apparently so...
[20:45] <Lunar_Lander_> nigelvh, in short: Cutdown MOSFET works
[20:45] <SpeedEvil> Or raspberry juice.
[20:45] <nigelvh> Good.
[20:46] <nigelvh> I assume you used something like a 9V or that lipo you've got?
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[20:46] <Lunar_Lander_> first, I mixed up gate and source I think
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[20:46] <nigelvh> The mosfets are different
[20:46] <Lunar_Lander_> caused the wire to glow red before plugging anything in
[20:46] <Lunar_Lander_> and the mosfet got hot
[20:46] <daveake> <Lunar_Lander_> first, I mixed up gate and source I think
[20:47] <daveake> Welcome to cuddykid's world
[20:47] <Lunar_Lander_> XD
[20:47] <nigelvh> You have to be careful with mosfets and pull down the gate with a resistor. They'll often float open.
[20:47] <Lunar_Lander_> yeah
[20:47] <daveake> which means your payload floating down
[20:47] <Lunar_Lander_> I found a nice tutorial that the sparkfun people linked to
[20:47] <daveake> early
[20:47] <Lunar_Lander_> xD yea
[20:47] <Lunar_Lander_> but first
[20:47] <nigelvh> Sparkfun's good for that.
[20:48] <Lunar_Lander_> nigelvh, I got 4x Energizer Lithium AA for the wire
[20:48] <jdtanner> got the link to the tut?
[20:48] <Lunar_Lander_> and for simulating the arduino pin on this test, I used 3 normal AA alkalines
[20:48] <Lunar_Lander_> one moment
[20:48] <nigelvh> So you got four for the payload and four for the wire?
[20:48] <jdtanner> thx :)
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[20:49] <Lunar_Lander_> http://bildr.org/2012/03/rfp30n06le-arduino/
[20:49] <jdtanner> thank you
[20:49] <Lunar_Lander_> nigelvh, on the test, I also have that 6 Ah lipo that I forgot at home
[20:49] <nigelvh> Either way
[20:50] <Lunar_Lander_> btw to prove that sparkfun linked this
[20:50] <nigelvh> Point of curiosity, why'd you use a mosfet rather than a 5v relay?
[20:50] <Lunar_Lander_> http://www.sparkfun.com/products/10213
[20:50] <Lunar_Lander_> here
[20:50] <Lunar_Lander_> ah, professor said that a relay's mechanical parts could fail
[20:51] <nigelvh> Technically yes, but i think it's pretty unlikely. We've used small relays on our rockets for years. They do fine.
[20:51] <nigelvh> Not that it matters
[20:52] <nigelvh> For this type of application where you don't need PWM or anything like that, I prefer a relay for the isolation and they're not a hair trigger like the mosfets are.
[20:52] <nigelvh> Again, not that it matters.
[20:54] <Lunar_Lander_> yea
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[21:03] <griffonbot> Received email: jules@g0nzo.co.uk "[UKHAS] BONZO1 launch Monday 7th"
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[21:40] <jcoxon> evening
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[21:42] <Jonititan> Hello
[21:46] <jcoxon> hi
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[21:55] <Jonititan> Sorry I was afk
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[22:01] <edmoore> Can someone give me a URL for navrac's rfm22.h?
[22:01] <NigeyS> yo edmoore
[22:01] <NigeyS> err
[22:02] <edmoore> Or whatever the canonical repo for it is
[22:02] <NigeyS> not got a link for it, ive got 1 for james's ?
[22:02] <edmoore> Fine just link
[22:02] <NigeyS> https://github.com/jamescoxon/Misc-Projects/tree/master/RFM22
[22:02] <edmoore> ta
[22:03] <NigeyS> :)
[22:04] <jdtanner> Anyone got a good source of NiCd C cells for a FT790?
[22:04] <fsphil> I got mine from tesco
[22:04] <NigeyS> maplins do buy 1 pack get 1 free quite often
[22:04] <jdtanner> Great, thanks chaps :)
[22:05] <fsphil> there are better batteries than nicd though
[22:07] <jdtanner> Such as?
[22:07] <jonsowman> mains
[22:07] <jdtanner> :P
[22:08] <fsphil> nimh
[22:08] <jonsowman> nimhs are marginally better, lithiums are even better if you can get a suitable pack
[22:08] <jonsowman> don't try and use the inbuilt charge circuitry though
[22:08] <fsphil> yea, charge them separately
[22:09] <jonsowman> otherwise your FT790 might contain more fire than you'd like
[22:09] <jdtanner> Ok, thanks&very useful to know. I haven't got a c-cell charger actually, so looks like I might need to invest in one
[22:11] <jdtanner> How about the aa to c converters&anyone used them?
[22:13] <Martin100> Yes, Sanyo Eneloop AA's in AA to C converters. No point in buying any other nicads or NiMh cells IMHO
[22:14] <jdtanner> great, I'll look into that thanks
[22:14] <Martin100> They are not cheap but they are so much better I have dumped all my other rechargables
[22:15] <jdtanner> I'd never heard of them...
[22:15] <jdtanner> right&must go to bed :)
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[22:23] <Lunar_Lander__> ROFL more fire than you like
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[22:26] Nick change: [1]Nickle -> Nickle
[22:27] <fsphil> well if you're cold it might help
[22:28] <Lunar_Lander__> xD
[22:29] <Lunar_Lander__> one of the ph.d. students suggested taking these match heads and ignite them with an electrical spark as a cutdown but I think that is not good, what if the payload then is on fire?
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[22:38] <daveake> On fire with what oxygen?
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[22:48] <Lunar_Lander__> yea
[22:48] <Lunar_Lander__> but the ignition could damage something maybe?
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[23:44] <Dan-K2VOL> hi upu
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[00:00] --- Tue May 1 2012