highaltitude.log.20060519

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[15:04] <macfreak4> hi
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[16:22] <macfreak4> hey
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[19:01] <macfreak4> hi
[19:01] <jcoxon> hey macfreak4
[19:01] <macfreak4> i am so impressed
[19:01] <macfreak4> bought a whole bag of LED's from China and they arrived in 4 days
[19:02] <macfreak4> using tje standard mail service
[19:02] <macfreak4> the*
[19:02] <jcoxon> :-D
[19:05] Action: Tiger^ is vry impressed, too
[19:06] <macfreak4> hehe
[19:06] <Tiger^> f***ing pcb house mailed me my pcbs on tuesday
[19:06] <macfreak4> :(
[19:06] <Tiger^> as a standard letter
[19:06] <Tiger^> not as a priority parcel, as i asked them to
[19:07] <jcoxon> hehe
[19:07] <Tiger^> it's not here yet :(
[19:07] <macfreak4> so you sent them the pcb layout and they made them, or did they do the layout as well?
[19:07] <Tiger^> i did the layout
[19:07] <macfreak4> kk
[19:07] <Tiger^> i mean, Eagle did it for me ;)
[19:07] <macfreak4> lol
[19:07] <macfreak4> yeah i just installed eagle
[19:08] <macfreak4> and i like it a LOT
[19:08] <macfreak4> :D
[19:08] <Tiger^> yeah, it's *much* better than those big design suites
[19:08] <Tiger^> like Protel
[19:08] <macfreak4> yea i looked at a review for Protel, too
[19:08] <macfreak4> doesn't look so good
[19:08] <macfreak4> for the money, that is
[19:09] <Tiger^> yup
[19:10] <Tiger^> and it's overcomplicated ;)
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[19:10] <macfreak4> hey
[19:11] <Tiger^> oh, and i got my helium regulator today
[19:11] <macfreak4> you had to buy one?
[19:12] <Tiger^> well yeah
[19:12] <macfreak4> can't rent one?
[19:13] <Tiger^> hmm maybe
[19:13] <Tiger^> but as i'm planning more launches than just one
[19:13] <macfreak4> o ok
[19:13] <macfreak4> well then buying one probably makes more sense ;)
[19:13] <macfreak4> o btw my launch date got bumped by the FAA
[19:14] <Tiger^> oh
[19:14] <Tiger^> why?
[19:14] <macfreak4> the folks over at the airport say that I'm in Class B airspace and they "don't want to deal with no balloon"
[19:14] <macfreak4> :(
[19:15] <macfreak4> funny thing is, Class B airspace covers more than St. Louis, pop. 3 million, for a radius of about 20 miles
[19:15] <macfreak4> !!!
[19:15] <Tiger^> :/
[19:16] <Tiger^> can you launch from somewhere else?
[19:16] <Tiger^> outside restricted airspace?
[19:16] <macfreak4> yeah, i suppose
[19:16] <macfreak4> but the point of launching from school was so people could see it ;)
[19:16] <Tiger^> oh
[19:16] <Tiger^> well i don't want to attract attention :)
[19:17] <macfreak4> o
[19:17] <Tiger^> and besides, Warsaw is a 1.5mln+ city
[19:17] <Tiger^> so i can't launch it here
[19:18] <Tiger^> i've got a great launching spot here in the suburbs
[19:18] <macfreak4> but didn't the Balloon v1.0 guy launch in the middle of San Francisco? Or was that my imagination?
[19:18] <Tiger^> a big field
[19:18] <Tiger^> no trees
[19:18] <Tiger^> etc.
[19:18] <Tiger^> but there's also a final approach corridor above
[19:18] <Tiger^> to Okecie international
[19:19] <macfreak4> oh
[19:19] <Tiger^> macfreak4: hmm, nope
[19:19] <Tiger^> macfreak4: i think he launched from newark
[19:19] <Tiger^> let's see...
[19:19] <Tiger^> yup, "I'd decided to launch from Newark, CA"
[19:20] <macfreak4> oh
[19:20] <macfreak4> lol
[19:20] <macfreak4> well here i guess a few years ago when Lambert St. Louis Int'l was TWA's hub, I would have had an even tougher time getting a NOTAM
[19:21] <Tiger^> yeah
[19:22] <macfreak4> any idea where I might find a bloody 1/4 watt resistor in Eagle?
[19:22] <macfreak4> been looking for a few minutes now and can't find it
[19:22] <Tiger^> sure, wait a sec
[19:22] <macfreak4> k thx
[19:23] <Tiger^> ok, it's: rcl -> R-EU_ -> R-EU_0204/7
[19:23] <Tiger^> for the european symbol, a rectangle
[19:24] <macfreak4> oh thx
[19:24] <macfreak4> lol was looking in the wrong place
[19:24] <Tiger^> and R-US_ -> R-US_0204/7 for the zigzag symbol
[19:24] <macfreak4> nah i like the rectangle better :D
[19:24] <macfreak4> hehe
[19:24] <Tiger^> yeah it takes a bit of practice to find things in eagle
[19:25] <Tiger^> but almost everything an amateur would use is in there
[19:25] <Tiger^> and if sth's not, you can download an additional library
[19:25] <Tiger^> or make it yourself
[19:26] <Tiger^> i've been using eagle for two years now, and the only thing i had to draw myself was the fx614 FSK modem chip
[19:28] <macfreak4> hmm i think it needs a search feature
[19:29] <Tiger^> you can find a group
[19:29] <Tiger^> just type first letters of a group name
[19:30] <Tiger^> it's not as good as a search form maybe ;)
[19:30] <macfreak4> yeah
[19:30] <Tiger^> but it makes searching easier
[19:30] <macfreak4> now i'm looking for DB25 and DB9 sockets...
[19:30] <macfreak4> its getting annoying
[19:32] <Tiger^> hm
[19:32] <macfreak4> yay
[19:32] <macfreak4> just found it
[19:40] <macfreak4> does eagle have a ground symbol in the library, that you know of?
[19:42] <Tiger^> of course
[19:42] <Tiger^> it's in supply1
[19:42] <macfreak4> ok thx
[19:42] <Tiger^> a lot of gnd symbols
[19:42] <Tiger^> ;)
[19:43] <macfreak4> oooh
[19:43] <macfreak4> ahh
[19:43] <macfreak4> lol
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[20:19] <macfreak4> gettin the hang of this
[20:23] <Tiger^> :)
[20:24] <macfreak4> whee
[20:24] <macfreak4> 'tis done
[20:24] <Tiger^> yeah, i'm reviewing my schematics for the flight computer
[20:24] <Tiger^> as i don't have the pcbs i'll solder all the connectors
[20:25] <macfreak4> i'll upload & get you the link
[20:25] <macfreak4> macfreak4.homeunix.com/photos/PrinterPortSchematic.gif
[20:26] <Tiger^> nice :)
[20:26] <Tiger^> what's the motor for?
[20:26] <macfreak4> mirror assembly, so the cam can look down
[20:26] <Tiger^> oh
[20:27] <Tiger^> i just used two cams
[20:27] <macfreak4> ya i've got two cams too
[20:27] <Tiger^> side-looking and down-looking
[20:27] <macfreak4> one for high-quality pictures, another is a webcam for live feedback
[20:27] <macfreak4> the webcam is the one with the mirror
[20:28] <macfreak4> and it'll take videos and save them onboard as well
[20:28] <macfreak4> its not very complicated, so i figured why not
[20:28] <Tiger^> yeah
[20:30] <macfreak4> and i used 2 TIP120 darlington transistors for the burn wires
[20:30] <macfreak4> was going to use relays, but thought against that idea :P
[20:32] <Tiger^> i used a mosfet :)
[20:32] <macfreak4> yeah
[20:32] <macfreak4> i havent used mosfets before so i used something more familiar
[20:34] <Tiger^> i'll tell you, they're cranky little bastards ;)
[20:34] <Tiger^> even a weakest electrical field sets them off
[20:34] <macfreak4> oh
[20:35] <macfreak4> how do they work differently than "normal" transistors?
[20:35] <macfreak4> i don't even know ;)
[20:35] <Tiger^> as the name suggests
[20:35] <Tiger^> Field Effect Transistors
[20:35] <Tiger^> they don't react to current
[20:36] <Tiger^> but to electrical field
[20:36] <macfreak4> oh
[20:36] <macfreak4> didn't know the acronymn, either
[20:36] <Tiger^> they're voltage driven, not current
[20:36] Nick change: malgar -> malgarA\C
[20:36] <Tiger^> you don't have B C and E
[20:36] <Tiger^> you have a Gate, a Drain and a Source
[20:36] <Tiger^> B = G, C = D, E = S
[20:37] <Tiger^> MOSFET's turn on when electrical field is applied to the gate
[20:37] <Tiger^> and turn off when the gate is connected to the source
[20:37] <macfreak4> oh
[20:37] <Tiger^> if used correctly, they're very, very, very useful
[20:38] <macfreak4> what's the advantage?
[20:38] <Tiger^> they're much faster than bipolars
[20:39] <Tiger^> they don't eat up current
[20:39] <Tiger^> they don't need base current at all to turn on
[20:39] <Tiger^> they're very robust - they're usually used as final stages in audio amps
[20:40] <macfreak4> oh
[20:40] <Tiger^> for example, my mosfet has 9 amps drain-source
[20:40] <Tiger^> but it endures such a current (i don't even have a meter to measure it)
[20:40] <macfreak4> the TIP120 can only handle 5.0A continuous
[20:40] <macfreak4> *shruggs*
[20:40] <Tiger^> that i can weld small metal objects ;)
[20:41] <Tiger^> like wires
[20:41] <Tiger^> not to mention soldering, lol
[20:41] <Tiger^> brb
[20:42] <macfreak4> k
[22:23] Nick change: malgarA\C -> malgar
[22:57] <macfreak4> alrightey
[22:57] <macfreak4> here's what I got online so far
[22:57] <macfreak4> http://macfreak4.homeunix.com/projects/ensure/index.html
[23:05] <Tiger^> great
[23:05] <Tiger^> a new design
[23:06] <Tiger^> everyone mounts stuff horizontally
[23:08] <macfreak4> oh
[23:08] <macfreak4> technically speaking, is there a problem I should know about mounting vertically?
[23:09] <macfreak4> because if there is I want to know
[23:09] <macfreak4> i was wondering that myself
[23:09] <macfreak4> when i designed it
[23:09] <Tiger^> hmm
[23:09] <Tiger^> dunno
[23:09] <Tiger^> i'd really like to see how it performs
[23:09] <macfreak4> i did it mainly because the laptop fits better that way :P
[23:09] <macfreak4> just slides right in
[23:10] <macfreak4> and the ports are on the top -- very easy to access
[23:10] <Tiger^> yeah
[23:10] <Tiger^> let me think... hmm...
[23:10] <Tiger^> AFAIR, the impact force
[23:10] <Tiger^> should be perpendicular
[23:10] <Tiger^> to the axis of mounted object
[23:10] <macfreak4> yea
[23:10] <Tiger^> the problem is, which axis ;P
[23:11] <macfreak4> ?
[23:11] <macfreak4> simple geometry, right?
[23:11] <macfreak4> all the boards are at a slight angle, mounted vertically
[23:11] <macfreak4> the impact force is perpendicular to the floor of the payload
[23:14] <Tiger^> that's right
[23:15] <Tiger^> but it's not perpendicular to the laptop
[23:15] <macfreak4> no it would be nearly parallel
[23:15] <macfreak4> yea
[23:15] <Tiger^> yeah
[23:15] <Tiger^> so the question is
[23:15] <Tiger^> is that a better way
[23:15] <macfreak4> i suppose it all depends on the structural integrity of the equipment
[23:15] <Tiger^> if it is, then congrats, you've just revolutionized near space payloads :P
[23:16] <macfreak4> hehe
[23:16] <Tiger^> :)
[23:16] <macfreak4> well, if people like my method
[23:16] <macfreak4> otherwise I'm just an anomaly
[23:16] <macfreak4> ;)
[23:16] <Tiger^> ;)
[23:20] <macfreak4> keeping the center of gravity in the center is slightly annoying
[23:20] <macfreak4> i'll get it right, and then forget that I planned on installing some more components on one side, and then I'll have to rearrange again
[23:21] <macfreak4> currently, its leaning towards the Kodak camera side
[23:21] <macfreak4> hehe
[23:21] <macfreak4> and boy is it going to be toasty inside...
[23:21] <macfreak4> 10+ watts of heat
[23:22] <Tiger^> and -60 C outside
[23:22] <macfreak4> more like -60 F
[23:22] <macfreak4> er
[23:22] <Tiger^> -60 F = -50C
[23:22] <Tiger^> ;)
[23:22] <macfreak4> yea
[23:22] <macfreak4> that's what it is, right?
[23:23] <Tiger^> something like that
[23:24] <macfreak4> wtf!?
[23:24] <macfreak4> oh lol i read "thermosphere" instead of "troposphere"
[23:24] <Tiger^> ;)
[23:25] <macfreak4> ur right it does get to -60C around 12-15 km altitude
[23:25] <macfreak4> but then back up to -40C
[23:25] <macfreak4> around 30km
[23:25] <macfreak4> depends on where you are, too
[23:31] <Tiger^> yeah in Poland i can expect -60C, heavy rainfall and thunderstorms ;P
[23:31] <Tiger^> and a thick layer of clouds
[23:31] <Tiger^> typical polish spring, hehe
[23:34] <macfreak4> lol
[23:34] <macfreak4> it's pretty clear here
[23:34] <macfreak4> *looks out the window*
[23:35] Action: macfreak4 just remembered this command
[23:41] <Tiger^> ;)
[00:00] --- Sat May 20 2006