highaltitude.log.20060509

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[02:48] <macfreak4> yay!
[02:49] <defy> yay!
[02:49] <defy> lol, why yay
[02:49] <macfreak4> i finished the voltage regulator and h-bridge circuits
[02:49] <macfreak4> :D
[02:49] <macfreak4> finally
[02:49] <defy> sweet
[02:49] <macfreak4> how ya doin?
[02:49] <defy> pretty good, you?
[02:49] <macfreak4> yea :P
[02:49] <macfreak4> not much homework 2nite, so that's good...
[02:51] <defy> haha fun, I remember homework
[02:52] <defy> I never did it :P
[02:53] <macfreak4> lol
[02:54] <macfreak4> well I'm pretty happy because I got recommended by my physics teacher for AP Chemistry next year
[02:54] <defy> sweet
[02:54] <macfreak4> which sophomores aren't *supposed* to take
[02:54] <macfreak4> its basically a senior class
[02:56] <defy> is the regulator for your balloon project?
[02:56] <macfreak4> yea
[02:56] <defy> cool
[02:56] <macfreak4> for the HT and blinking recovery lights
[02:56] <macfreak4> its just two 7812 linear regulators on heatsinks
[02:56] <macfreak4> but I'm proud of it
[02:56] <macfreak4> ;)
[02:57] <defy> hehe
[02:57] <defy> i have a bunch of 5v regulators i bought before i found out that the robostix has them built on..so never got round to figuring out how to use them
[02:58] <macfreak4> oh
[02:58] <macfreak4> are they the 7805 type?
[02:58] <macfreak4> the 78xx series is a snap
[02:58] <defy> *looks*
[02:58] <macfreak4> three pins, Input - Ground - Output
[02:58] <defy> L7805CV they say on them, so i assume so yeah
[02:59] <macfreak4> oh yeah
[02:59] <macfreak4> cool
[02:59] <defy> I'll probably end up using them still to power my gyros seperately
[02:59] <defy> since im starting to see a bit of noise down the ADC lines when using mroe than one gyro
[02:59] <macfreak4> o ok
[02:59] <macfreak4> so you're recording orientation, too?
[02:59] <defy> not too hard to setup then?
[03:00] <macfreak4> nope
[03:00] <macfreak4> the batteries go into the first pin (with the regulator facing you, pins down)
[03:00] <macfreak4> ground on the 2nd pin
[03:00] <macfreak4> and output from the 3rd pin
[03:00] <macfreak4> nothing more
[03:00] <defy> well the gyros are for a semi seperate project...or maybe the second project...im going to try to use them for an auto stablizer on a glider
[03:00] <macfreak4> :D
[03:00] <macfreak4> oh that's nice
[03:00] <defy> yea? cool...no capacitors?
[03:01] <macfreak4> not unless you're regulating from an AC rectifier
[03:01] <defy> ah
[03:01] <defy> I'd probably just use 7.2v 6 cells
[03:01] <macfreak4> well if you're constantly drawing power from the battery in large surges then an electrolytic capacitor would be good
[03:01] <macfreak4> but on a balloon that's unlikely
[03:02] <macfreak4> only on robotics applications would you need that
[03:02] <macfreak4> where motors cause noise
[03:02] <defy> the gyros draw is pretty much constant
[03:02] <macfreak4> yea so u should be fine
[03:02] <defy> however if i power the servos seperately, some of my high torque ones can pull up to an amp at a time
[03:02] <macfreak4> oh
[03:02] <macfreak4> :/
[03:02] <defy> so that would need some kind of capacitor?
[03:03] <macfreak4> consider putting a 10-100uF electrolytic capacitor across the input to the regulator
[03:03] <macfreak4> whatever you have on hand
[03:03] <defy> sweet
[03:03] <defy> I'm a software person really so I'm a complete noobie when it comes to electronics
[03:03] <macfreak4> oh yea
[03:04] <macfreak4> no worries
[03:04] <macfreak4> ;)
[03:04] <defy> gettin the hang of the basics slowly, hehe
[03:04] <macfreak4> :)
[03:07] <macfreak4> i think i'm going to need to put in a cutdown device....
[03:07] <macfreak4> i just have thoughts of the balloon becoming neutrally buoyant and ending up in the pacific ocean
[03:08] <macfreak4> lol
[03:18] <macfreak4> wee just bought 75 feet of nichrome burn wire for $3.99
[03:24] <defy> haha i was just talking to my flatmate about cutdown
[03:26] <defy> I wanted to have something that would release if it all lost power
[03:26] <defy> might get too complicated though
[03:26] <macfreak4> is that even possible?
[03:42] <defy> yea, something spring loaded with an electrical switch holding it open
[03:44] <defy> my flatmates idea was to use a party balloon to connect the big ballon and the payloads, and fill it with the correct amount of air to pop and certain altitudes, heh
[03:45] <defy> but thats not really an emergency release
[03:45] <macfreak4> oh
[03:45] <macfreak4> well you could use a relay that has a normally closed switch
[03:46] <macfreak4> and have it always connected to the batteries, so that when the power goes out the relay activates and...
[03:46] <defy> I'll probably start looking into a cutdown once i get all my housing gear
[03:46] <macfreak4> oh wait that requires power
[03:46] <macfreak4> lol
[03:46] <defy> haha, well i suppose if it had its own batteries
[03:46] <defy> but it wouldnt cover 100% failure
[03:46] <macfreak4> i'm just going to use a relay and a couple inches of nichrome wire on its own 9v battery
[03:47] <defy> cool
[03:47] <macfreak4> I'm not expecting a full-system failure -- the ride at altitude should be pretty smooth
[03:47] <macfreak4> landing will be tough, though
[03:47] <macfreak4> i get the feeling I'm going to need to reinforfce my styrofoam a bit...
[03:47] <macfreak4> hmmm
[03:48] <defy> do you use that to cut through other string? or are you using that as the string?
[03:48] <macfreak4> cut through the string
[03:48] <defy> cool
[03:48] <defy> seems simple enough, i like simple
[03:48] <defy> i have to have 2 independant cutdown systems in order for it to be legal here as well
[03:48] <macfreak4> always KISS
[03:48] <defy> yup
[03:49] <macfreak4> that should be a bumper sticker
[03:49] <macfreak4> lol
[03:49] <defy> lol
[03:49] <macfreak4> "Always KISS"
[03:49] <macfreak4> hehe
[03:49] <macfreak4> well according to how I understand the FAA, all I need is the ability to cut down from the balloon
[03:49] <macfreak4> so I'll just use one probably
[03:53] <macfreak4> "The cheapest, fastest and most reliable components of a computer system are those that aren't there.
[03:53] <macfreak4> lol
[03:53] <defy> hehe
[04:32] <macfreak4> well i g2g
[04:32] <macfreak4> cya
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[08:33] <defy> hey man whats up
[08:34] <defy> all my screws arrived today, i made some spacers and locked all my gumstix boards together, no more falling apart in the middle of using them :D
[08:35] <jcoxon> :-D
[08:35] <jcoxon> and gps working now?
[08:37] <defy> it was yesterday quite well, but i've just plugged it all back in and am waiting for a fix...its been 19 minutes so far
[08:37] <defy> how quickly does yours get a fix from a cold start?
[08:37] <jcoxon> hmmm it depends
[08:37] <jcoxon> my room is like a faraday cage
[08:37] <jcoxon> need to do some testing once it stops raining
[08:38] <jcoxon> it does take a while
[08:38] <defy> lol
[08:38] <jcoxon> perhaps not 19mins though
[08:38] <defy> yea i was having better luck with it yesterday
[08:38] <defy> i dont know weather i bumped something on the resister or what, but there is still voltage coming off of the sma so i assume its okay
[08:38] <jcoxon> is the voltage constant?
[08:38] <defy> seems to be yeah
[08:39] <jcoxon> also your antenna is definitly 3.3V not 5V
[08:40] <defy> hrm
[08:40] <defy> dont think i took notice to that to be honest, good point..
[08:40] <defy> i got the one recommended, but now i know craig only mentioned it because they were the same connectors
[08:40] <defy> lol
[08:41] <defy> Voltage 3.3V +/- 0.5V
[08:41] <defy> and i get a constant 3.285 from the connecter
[08:42] <jcoxon> hehe
[08:43] <defy> ah well, ill just leave it..thats what worked last time
[08:43] <jcoxon> right will be back in 10
[08:43] <defy> :)
[09:05] <defy> hrm
[09:05] <defy> i just checked the datasheet for my antenna and it says 5v
[09:06] <defy> even though sparkfun says 3.3...I'm going to assume the datasheet is correct over the website
[09:06] <jcoxon> back
[09:07] <jcoxon> any way you can make a 5v supply?
[09:08] <jcoxon> disconnect the resistor fron nssp
[09:08] <jcoxon> and run it through the resistor?
[09:08] <jcoxon> and see if you get an improvement
[09:08] <defy> yea
[09:09] <defy> wonder if theres 5v anywhere on the board
[09:10] <jcoxon> doubt it
[09:10] <jcoxon> it all runs at 3.3 and you don't have any serial ports
[09:21] <defy> ah they're all ttl arent they
[09:24] <jcoxon> yup
[09:24] <jcoxon> would need a rs232 convertor
[09:28] <jcoxon> right i better be off
[09:29] <jcoxon> got to man the ballot box for our university elections
[09:31] <defy> sweet, have fun :)
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[20:10] <jcoxon> http://g0wxj.demon.co.uk/
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[23:13] <macfreak4> hewo
[23:18] <jcoxon> hey macfreak4
[23:18] <macfreak4> hi
[23:19] <macfreak4> launch is less than 2 weeks away !!
[23:19] <jcoxon> just got my camera linked up
[23:19] <jcoxon> oooo cool
[23:19] <jcoxon> expect lots of updates
[23:19] <jcoxon> what is the actual date?
[23:19] <macfreak4> May 22, 7:45 AM Central Daylight Time
[23:20] <macfreak4> one day before finals start
[23:20] <macfreak4> ;)
[23:20] <jcoxon> what size balloon?
[23:21] <jcoxon> and payload weight
[23:21] <macfreak4> balloon will be 1200 grams
[23:21] <macfreak4> I'm ordering it from Kaymont tonight
[23:21] <macfreak4> I just hope it gets here in time...
[23:21] <jcoxon> :-D
[23:21] <jcoxon> i'm sure it will
[23:22] <macfreak4> and the payload is going to end up 7-8lbs
[23:22] <jcoxon> right so its going to go a far distance up
[23:22] <macfreak4> I suppose
[23:22] <macfreak4> Balloon v1.0, at 8lbs, got to 80,000 ft on a 1500gram kaymont
[23:23] <macfreak4> so it shouldn't be too high but it'll definitely be up there
[23:24] <jcoxon> :-D
[23:24] <jcoxon> i'm progressing nicely
[23:24] <macfreak4> so you got your new camera working, or the old one?
[23:25] <jcoxon> a new one
[23:25] <jcoxon> its 3.1MP
[23:25] <macfreak4> ah
[23:25] <macfreak4> that's nice
[23:25] <jcoxon> and its nice and simple
[23:25] <macfreak4> does it have a CCD sensor?
[23:25] <jcoxon> starts up without the flash which is good
[23:26] <jcoxon> i assume a ccd
[23:26] <macfreak4> you just unsoldered the flash tube and capacitor, or ??
[23:27] <jcoxon> nah i'm not going to
[23:27] <macfreak4> oh
[23:27] <jcoxon> i usually do
[23:27] <jcoxon> but it usually breaks things
[23:27] <macfreak4> o lol
[23:27] <jcoxon> just soldered 2 wires to the shutter button
[23:28] <jcoxon> and will turn the camera on manually and also turn the screen off
[23:28] <jcoxon> the only thing is it runs off 4 AAA
[23:28] <jcoxon> i guess that it'll have a long battery life
[23:28] <macfreak4> oh lucky >:O
[23:28] <macfreak4> my screen doesnt turn off!
[23:28] <macfreak4> :P
[23:29] <macfreak4> I hacked my camera to run on two D batteries (normally takes 2 AA's)
[23:29] <jcoxon> :-D
[23:29] <macfreak4> it'll be turned on/off by the computer, tho, to save the batts
[23:29] <macfreak4> its a power hog
[23:29] <macfreak4> in fact, my whole system is a power hog
[23:30] <macfreak4> 10 watts for the laptop
[23:30] <jcoxon> thats a lot
[23:30] <jcoxon> ooo the quality isn't bad on this camera
[23:30] <macfreak4> post a sample :D
[23:30] <jcoxon> hmmm of what...
[23:30] <macfreak4> a sample picture from the camera
[23:41] <jcoxon> grrr my host is being annoying
[23:41] <jcoxon> seems i've exceeded my quto
[23:41] <jcoxon> quota*
[23:41] <macfreak4> :(
[23:41] <macfreak4> i used to have fits with webhosts
[23:41] <jcoxon> seems to be good with close up
[23:42] <jcoxon> will test landscapes tomorrow when it is light
[23:42] <macfreak4> nice pic :D
[23:43] <macfreak4> ya i finally got fed up with the free webhost I was using and started my own server
[23:43] <jcoxon> some one offered some hosting
[23:43] <jcoxon> i might take it up
[23:43] <jcoxon> need to think of a domain name
[23:45] <macfreak4> thats a shot i took earlier when I first got the cam
[23:45] <macfreak4> now everything is green ;)
[23:45] <jcoxon> where?
[23:46] <macfreak4> it's "awaiting reply"
[23:46] <macfreak4> hmm
[23:46] <jcoxon> nope
[23:46] <macfreak4> now?
[23:46] <jcoxon> nothing on the file receive list
[23:46] <macfreak4> forget it i'll just upload it
[23:47] <macfreak4> http://macfreak4.homeunix.com/photos/101_4272.JPG
[23:49] <jcoxon> cool
[23:49] <jcoxon> good quality
[23:49] <jcoxon> what type of camera is it?
[23:51] <macfreak4> Kodak EasyShare ...
[23:51] <macfreak4> ugh
[23:51] <macfreak4> cant remember the model!
[23:52] <macfreak4> and it's glued to the polystyrene
[23:52] <macfreak4> hmm...
[23:52] <macfreak4> well it's 2.0 MP with a CCD sensor
[23:52] <macfreak4> uses MMC/SD cards
[23:52] <macfreak4> and it has a little 3x optical zoom that's pointless for a balloon ;)
[23:53] <macfreak4> got it for free b/c the seller was really unclear in the auction
[23:53] <macfreak4> instead of saying "I have 3 of these cameras for sale elsewhere" he said "There are three cameras for sale" and the auction said "Lot of 3"
[23:54] <macfreak4> even though he was only selling one
[23:54] <macfreak4> so he got fed up and just shipped it
[23:55] <jcoxon> hehe
[23:59] <jcoxon> oooo thats better
[23:59] <jcoxon> it was stuck on macro focussing
[23:59] <jcoxon> now its back onto landscape
[23:59] <macfreak4> :)
[00:00] --- Wed May 10 2006