highaltitude.log.20061230

[00:42] <LaurenceB> night all
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[09:37] <jcoxon> zeusbot, .weather
[09:40] <jcoxon> stupid zeusbot
[09:43] <mc-> have you tested your cutdown recently?
[09:44] <mc-> I've got 6000uF cap on mine, hope that's enough?
[09:56] <mc-> I've just tested my payload outside, all working, off to the postoffice
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[12:23] <rocketboy> hey jcoxon - how long do you leave between text messages on ascent and descent? do you stop sending texts above 3000ft now? or do you carry on throughout the flight?
[12:24] <mc-> rocketboy, I've just sent you the payload + gyro
[12:26] <rocketboy> ah - ta - i'll let you know when i get them
[12:31] <jcoxon> hey rocketboy
[12:31] <jcoxon> basically i leave it to send every minute
[12:31] <jcoxon> the software has a timeout
[12:31] <jcoxon> i'm probably going to change it to every 2 minutes instead
[12:35] <rocketboy> ta - is that enough to capture a couple of texts or so on the descent before it hits the ground?
[12:36] <jcoxon> ummmm maybe one
[12:36] <jcoxon> probably not
[12:36] <jcoxon> have to get the timing right - as in it starts to send as soon as reception is got
[12:37] <rocketboy> so do you monitor received signal strength?
[12:37] <jcoxon> i can do
[12:37] <jcoxon> just need to write the code
[12:37] <jcoxon> at the moment Peg IV is at its most basic
[12:37] <jcoxon> its now time for me to add some additional complexity
[12:37] <jcoxon> sorry guys am going to have to go
[12:38] <jcoxon> will be back later
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[12:44] <rocketboy> bbl2
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[20:18] <jcoxon> got peg IV to record mobile signal strength and the phone battery on the flight :-D
[22:24] LaurenceB (n=laurence@host86-144-134-113.range86-144.btcentralplus.com) joined #highaltitude.
[22:24] <LaurenceB> hi all
[22:24] <icez> hi
[22:25] <LaurenceB> got over 300 grams thrust out of my rc plane motor today !
[22:25] <icez> :D
[22:25] <LaurenceB> thats enough for my glider to be a vtol plane
[22:25] <LaurenceB> lol
[22:26] <LaurenceB> just slightly worried the motor might explode
[22:26] <LaurenceB> its designed for about 30 grams thrust
[22:26] <icez> :/
[22:27] <icez> yeah, i (tried to) make an helicopter out of parts from a miniature RC car once
[22:27] <icez> but the motor couldn't support the weight of an AA battery:(
[22:27] <LaurenceB> I've put the motors back on my glider now and built a cut out circuit
[22:28] <LaurenceB> as li-poly batteries can explode if you discharge them too much
[22:28] <icez> :/
[22:28] <icez> that wouldn't be good
[22:28] <LaurenceB> tried using mosfets but the internal resistance is too high about 0.5 ohms
[22:29] <LaurenceB> so I've used a subminiture relay switch
[22:29] <LaurenceB> internal resistance is less than 50 milliohms
[22:29] <icez> i'm currently hacking up a webcam to get only IR light :]
[22:29] <LaurenceB> and its smaller than a mosfet!
[22:29] <LaurenceB> cool
[22:30] <LaurenceB> I'm not sure if I should use the motors in series or parallel
[22:31] <LaurenceB> parallel- vertical take off followed by explosion
[22:31] <LaurenceB> series- perhaps a bit underpowered
[22:31] <LaurenceB> will have to see exactly how much thrust I can make once I've got a li-poly
[22:32] <LaurenceB> all depends on the internal resistence of the battery
[22:34] <LaurenceB> icez- if you've got the same plane, you should install a li-poly battery, you could easily make it capable of vertical takeoff
[22:35] <icez> lol
[22:35] <LaurenceB> just watch your fingers
[22:36] <icez> i could switch the motors for 2 little rocket engines I have :]
[22:36] <LaurenceB> I sliced into my finger with one of the props
[22:36] <icez> i did that with a cpu fan once :)
[22:36] <icez> it hurts.
[22:36] <LaurenceB> rocket power plane now that would be cool
[22:36] <icez> yeah, but they are solid-propellant without anything to direct the flow :/
[22:37] <icez> and they last a few seconds :)
[22:37] <LaurenceB> worst thing is theres now blood sprayed all over my glider
[22:37] <icez> lol
[22:38] <LaurenceB> but my finger will survive
[22:38] <LaurenceB> I got over 300 grams from one motor using a pc power supply
[22:39] <LaurenceB> 8 amps @ 12v
[22:39] <icez> It's so sad, I have a ton of rockets and I can't launch them :[
[22:39] <LaurenceB> why not?
[22:39] <icez> I would need to own a few acres of land
[22:39] <icez> bah they passed a law because I live in a desert and everything can catch fire and all
[22:40] <icez> so you can only launch and recover within your own property :P
[22:40] <LaurenceB> thought you lived in france
[22:40] <icez> nah, I'm in Arizona:P
[22:40] <icez> and actually I come from Quebec, not France;)
[22:40] <LaurenceB> okay can't remember why I thought that lol
[22:41] <LaurenceB> think I was looking at your website
[22:41] <icez> maybe
[22:41] <icez> I probably have enough propellants to launch myself into space :p
[22:42] <LaurenceB> I want to test my motors to even higher thrust levels, but the blast from the propellors is blowing thing around in my workshop
[22:42] <icez> lol
[22:43] <LaurenceB> The thrust to current ratio seems to increase with current
[22:43] <icez> on the news tomorrow: *hurricane-force winds destroy Laurence's house*
[22:43] <LaurenceB> I wonder what the max possible thust from one of these little motors is
[22:44] <icez> well I bet they heat up and die before that
[22:44] <LaurenceB> I could make a rocket with two of them and a li poly battery
[22:45] <icez> i want to try to make one of those rockoons
[22:45] <LaurenceB> could be a new riot weapon as the props would chop people up
[22:45] <icez> :/
[22:45] <icez> get to 66000 ft and launch a rocket :)
[22:46] <LaurenceB> have two counterrotating props on the front and launch in out of a tube
[22:46] <LaurenceB> the nova team were going to launch a rocket, not sure if it's still on
[22:46] <LaurenceB> -rockoon
[22:47] <icez> i just don't know how I could put some sensors and stuff on the rocket
[22:47] <icez> aand a camera
[22:47] <LaurenceB> glue?
[22:48] <jcoxon> evening all
[22:48] <icez> well, it's just that I would need to find another way to blow out the parachute than the rockets' backburns
[22:48] <icez> otherwise it'll melt the electronics :]
[22:48] <LaurenceB> hi
[22:48] <icez> or blow them out into pieces
[22:49] <LaurenceB> I'm working on my master controller now
[22:49] <LaurenceB> I've got the tft monitor working in 16bit color mode :-)
[22:50] <icez> a monitor on your glider?:P
[22:50] <LaurenceB> but I had to use a graphics library by a german dude called peter kusters
[22:51] <LaurenceB> instead of the one I have the licence to from mcs electronics
[22:51] <LaurenceB> cus I can't get it to work grrr
[22:52] <LaurenceB> icez- yes I'm using an lcd monitor similar to phone screens
[22:52] <icez> ok
[22:53] <LaurenceB> its quite easy to use, runs off an SPI bus
[22:53] <LaurenceB> but you need a graphics library to get anywhere fast
[22:54] <icez> make your own :]
[22:55] <LaurenceB> yes it's not too complicated, but its nice to have it integrated into the compiler
[22:55] <LaurenceB> peter kusters library isnt
[22:56] <LaurenceB> i've bought a load of software of mcs electronics in holland
[22:57] <LaurenceB> I've got a bunch of tools for working with lcd displays
[22:57] <LaurenceB> it can even drive nokia phone screens
[22:57] <jcoxon> :-D
[22:57] <jcoxon> i once read a guide to driving one of those off a parallel port
[22:58] <LaurenceB> I did have a load a hacked versions of bittorrent
[22:58] <LaurenceB> but they were a bit old
[22:59] <LaurenceB> I can't work out why its so slow, I can only get about 4 fps
[22:59] <LaurenceB> I want video !
[22:59] <icez> lol
[23:00] <LaurenceB> cant see any reason why the micro shouldn't be able to send less than several 100 fps to the screen
[23:00] <LaurenceB> I'm going to try delving into the graphics library
[23:02] <LaurenceB> unfortunately storing video could be tricky
[23:02] <LaurenceB> anyway I'm going to have an interface system where you can configure the glider
[23:03] <LaurenceB> theres a little keypad with up down lift right and select buttons I've built
[23:05] <LaurenceB> wanted to make a windows style interface but havent got enough ram to store an image of the entire screen and the different windows so you can move them around ect
[23:07] <icez> LaurenceB, ever heard of MirageOS? (for TI calcs)
[23:07] <LaurenceB> just have to have different config screens... oh well
[23:07] <LaurenceB> I used to be obsessed with with ti calcs
[23:08] <LaurenceB> but never tried it
[23:08] <icez> oh
[23:08] <icez> it has a nice interface
[23:08] <icez> http://www.detachedsolutions.com/mirageos/manual/pmanager.php
[23:08] <icez> well, for that small of a screen:P
[23:08] <LaurenceB> I've made a 3d wireframe graphics viewer for ti calcs
[23:09] <LaurenceB> and an FFT demonstration program
[23:09] <icez> oh...did you post it to ticalc.org perhaps?
[23:09] <LaurenceB> no I should
[23:09] <icez> http://www.ticalc.org/archives/files/fileinfo/319/31957.html
[23:09] <icez> there's one there:/
[23:10] <icez> but you're not Dan Cook:P
[23:10] <LaurenceB> yes I should have coded it in asm
[23:10] <LaurenceB> it was in basic and a bit slow
[23:11] <LaurenceB> ran of files with a list of vertices and then pairs of numbers saying where lines should be drawn
[23:11] <LaurenceB> you could spin th objects around with the arrow keys
[23:12] <LaurenceB> considered using a ti calc for a balloon, but they are too unstable
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[23:12] <LaurenceB> hi rocketboy
[23:12] <icez> I never did anything fancy with ticalcs
[23:12] <rocketboy> hiya
[23:13] <jcoxon> hey rocketboy
[23:13] <icez> too unstable?!:P
[23:13] <LaurenceB> yes ti calcs crash
[23:13] <LaurenceB> all the time
[23:13] <icez> never seen one crash but oh well
[23:13] <icez> :P
[23:13] <LaurenceB> well it deosn't exactly crash
[23:13] <LaurenceB> it says memory error
[23:14] <icez> with asm stuff?
[23:14] <LaurenceB> well yes but I was planning on using scripts for a balloon
[23:15] <jcoxon> rocketboy, hows the payload coming along?
[23:15] <rocketboy> ok
[23:15] <jcoxon> cool :-)
[23:15] <LaurenceB> what do you have on it
[23:16] <rocketboy> I have all the software working - gps - radio - sd card - just finishing the hardware
[23:16] <LaurenceB> sd card cool
[23:16] <LaurenceB> do you use a file system?
[23:17] <rocketboy> I have written a FAT32 sub-system - but its too big to fit into the PIC I'm using (with all the other stuff) - so I'm just treating the SD card as one big file
[23:17] <LaurenceB> awesome, I'm not that good
[23:18] <rocketboy> Actually the file system is based on somthing I wrote years ago
[23:18] <rocketboy> for work
[23:18] <LaurenceB> there avr-dos for avrs
[23:19] <jcoxon> rocketboy, i've set Peg IV to record signal strenth of my nokia every 2 minutes
[23:19] <LaurenceB> haven't used it yet
[23:20] <LaurenceB> that should be interesting
[23:20] <jcoxon> however it just records the number of bars
[23:20] <jcoxon> so its a scale of 0 to 4
[23:20] <jcoxon> hehe
[23:20] <jcoxon> it also does battery life, network ID
[23:20] <LaurenceB> bet you have high signal strenght all the time
[23:20] <jcoxon> CellID
[23:20] <jcoxon> and something called LAC
[23:21] <LaurenceB> but cant connect bue to too many base stations
[23:21] <jcoxon> ooo thats location area code
[23:21] <LaurenceB> within range
[23:21] <LaurenceB> AVR-DOS : http://members.aon.at/voegel/
[23:22] <LaurenceB> mcs elctronics just theive thing off the net methinks
[23:23] <LaurenceB> they sell this on their website
[23:24] <rocketboy> do they pay the royalty to microsoft for the DOS file system?
[23:24] <LaurenceB> I'm guessing no
[23:24] <rocketboy> I think its suppoed to be $0.50 for each instance
[23:24] <LaurenceB> I'm annoyed with them at the moment can't get their font system working
[23:25] <jcoxon> icez, are you into astronomy?
[23:25] <LaurenceB> my lcd display is all screwed up
[23:25] <icez> jcoxon, of course!
[23:25] <jcoxon> thought so (you're on #space)
[23:25] <icez> you just found that out?:)
[23:25] <jcoxon> no no
[23:26] <jcoxon> right well i've got some pics i took in africa
[23:26] <jcoxon> i'll upload them for you to have a look
[23:26] <icez> cool:D
[23:26] <jcoxon> rocketboy, - the cutdown
[23:26] <jcoxon> do i need to sort out my circuit
[23:26] <jcoxon> or do we have to many already?
[23:26] <LaurenceB> are any of the other channels very active, I've looked and they all seem to be dead
[23:26] <icez> i was in #space first and then malgar talked to me about you guys :]
[23:27] <rocketboy> I guess you need to test it at least - seeing how it didn't seem to work last time
[23:27] <jcoxon> but do you see the issue
[23:27] <jcoxon> in theory we have 3 cutdowns competing to cutdown
[23:27] <LaurenceB> 3 ctdowns?
[23:28] <jcoxon> well 3 circuits as we have 3 payloads
[23:28] <jcoxon> thats of course if we fly train
[23:28] <rocketboy> I expected us to be only using one
[23:28] <rocketboy> the other 2 would just be for test
[23:29] <jcoxon> right okay
[23:29] <LaurenceB> I think I'll come along to the launch, but haven't got a payload
[23:29] <jcoxon> so perhaps if i just did software - and made it log the time it would cut
[23:29] <rocketboy> yes I thing a single balloon is the way to go
[23:29] <jcoxon> and then we can compare it
[23:29] <jcoxon> oh i agree totally
[23:29] <jcoxon> also the forcast is improving
[23:29] <jcoxon> down from 180km per h
[23:29] <jcoxon> to 110 :-)
[23:29] <icez> is that for pegasus or the UKHAS glider or another project?
[23:30] <jcoxon> this is for the launch next weekend
[23:30] <jcoxon> i guess its a UKHAS launch? rocketboy?
[23:31] <rocketboy> yes the 7th at EARS (Cambridge)
[23:32] <LaurenceB> where will the launch be from?
[23:32] <rocketboy> ere http://www.ears.org.uk/launches/site/index.shtml
[23:33] <LaurenceB> thanks
[23:33] <rocketboy> your welcome to come (and launch)
[23:34] <LaurenceB> haven't got anything to launch :-(
[23:34] <LaurenceB> but, have you seen my glider page on the wiki?
[23:34] <rocketboy> yep
[23:34] <LaurenceB> I've reattatched the motors
[23:35] <LaurenceB> and going to fit a li-poly battery to make it fly again
[23:35] <LaurenceB> do you have any experience of li-polys?
[23:36] <jcoxon> rocketboy, sorry more questions - parachute, i've got a 36"
[23:36] <rocketboy> Some of it reminds me of a radio tracking system I made some way back - it had 2 leds - one for left one for right
[23:37] <rocketboy> parachute - no problems I have scads - all the way up to 54 inch
[23:38] <jcoxon> cool
[23:38] <jcoxon> right what else :)
[23:38] <jcoxon> transport
[23:38] <LaurenceB> say would anyone be passing through cambridge on their way to the launch site, as I'd be coming down on the train and its too far to walk
[23:39] <LaurenceB> - there that fits the topic lol
[23:39] <jcoxon> i could bring my car up i guess
[23:39] <jcoxon> but i'm not allowed it at uni so it'll be difficult to then get it home
[23:40] <icez> lol:P
[23:40] <LaurenceB> it's okay then
[23:40] <rocketboy> I could pick you up Laurence - no probs
[23:40] <icez> get some rollerblades and boost your two propellers to the max :]
[23:40] <LaurenceB> cool thanks
[23:40] <jcoxon> can you pick me up as well :-D
[23:40] <jcoxon> hehe
[23:40] <jcoxon> sorry rocketboy for all the hassle
[23:41] <rocketboy> I can lend you some rocket morors to strap to the rollerblades
[23:41] <LaurenceB> lol
[23:41] <rocketboy> no hassle at all
[23:41] <icez> too bad nobody has a jet plane to come and get me :[
[23:41] <jcoxon> LaurenceB, if you need a place to stay - i have space in my set in collge
[23:41] <jcoxon> college*
[23:41] <LaurenceB> thats okay thanks, I'll propably go back on the train
[23:42] <jcoxon> okay no problem
[23:42] <jcoxon> rocketboy, so all thats left to sort out is helium i guess
[23:42] <rocketboy> Jcoxon - I'll make a list of things top do tomorrow - and email it round to make sure we have everything covered
[23:42] <jcoxon> cool
[23:42] <jcoxon> if you need anything do just get in touch
[23:42] <jcoxon> i've got time next week
[23:43] <jcoxon> i'm going back to cam on the saturday
[23:43] <rocketboy> ok
[23:43] <rocketboy> ah well I'm off to bed - c u all l8r
[23:43] <icez> cya LaurenceB
[23:43] <LaurenceB> cu
[23:43] <icez> oops
[23:44] <icez> cya rocketboy, I mean.
[23:44] <jcoxon> night rocketboy
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[23:44] <LaurenceB> lol I thought you were going
[23:44] <jcoxon> icez, right nearly done
[23:44] <jcoxon> stupid ftp
[23:46] <jcoxon> http://www.pegasushabproject.org.uk/astronomy/\
[23:46] <jcoxon> oops
[23:46] <jcoxon> http://www.pegasushabproject.org.uk/astronomy/
[23:46] <jcoxon> they are rather random
[23:46] <jcoxon> literally a camera on a table of the sky
[23:47] <icez> ok
[23:47] <icez> on 113 i see one dot
[23:47] <icez> two dots:)
[23:47] <jcoxon> interesting dots
[23:48] <icez> yeah, I had something like that once
[23:48] <icez> but it was a bit noisy
[23:49] <icez> you're into astronomy too right?:)
[23:49] <jcoxon> i did it for GCSE
[23:49] <jcoxon> but haven't done any for years
[23:50] <icez> i can't think of a world without astronomy now;)
[23:50] <LaurenceB> oxford uni space and astronomy soc
[23:50] <LaurenceB> I'm the webmaster
[23:50] <icez> where?
[23:50] <LaurenceB> just a sec (pc crashing again)
[23:50] <icez> oh ok
[23:50] <icez> users.ox.../~space
[23:51] <LaurenceB> yes
[23:51] <jcoxon> oops - 136 is the wrong pic
[23:51] <jcoxon> actually it isn't
[23:51] <LaurenceB> do you like my web design?
[23:51] <jcoxon> just looks better on my preview
[23:51] <icez> LaurenceB, colorful;)
[23:52] <LaurenceB> the soc is a bit useless
[23:52] <icez> i'm still working on getting my butt off my chair and joining some astronomy group here
[23:52] <icez> my college has literally no club at all
[23:53] <jcoxon> right - i've got a question for you all (well apart from LaurenceB as he'll probably be there)
[23:53] <icez> ?:)
[23:53] <jcoxon> is it worth me setting up a system where zeusbot will report the position of Peg IV
[23:53] <jcoxon> is it interesting
[23:53] <icez> yes it is!
[23:54] <jcoxon> i've got to options - either get peg IV to actually sms the position to zeusbot (via a gateway etc)
[23:54] <jcoxon> or me forward the message
[23:54] <jcoxon> i reckon the first option is more authentic
[23:55] <icez> i wonder how much a two-way plane ticket costs from AZ to UK :)
[23:55] <jcoxon> at the moment if you go:
[23:55] <jcoxon> hehe
[23:55] <LaurenceB> brb
[23:57] <icez> jcoxon, any temp sensors this time?:P
[23:57] <jcoxon> nope - sadly not
[23:57] <icez> aww
[23:57] <jcoxon> didn't really work out a way to interface them with the router
[23:57] <jcoxon> however i've been discussing on #gumstix about Peg V
[23:57] <jcoxon> where i'm going to have the same payload
[23:57] <icez> too bad routers don't have temp sensors built-in like some computer motherboards
[23:58] <jcoxon> but also rig up a gumstix as a sensor suite
[23:58] <jcoxon> with some accelerometers etc
[23:58] <icez> ok:]
[23:58] <jcoxon> have it in the payload bay
[23:59] <icez> do you happen to know the minimum altitude that someone can launch a satellite?
[23:59] <LaurenceB> what do you mean by min altitude?
[00:00] --- Sun Dec 31 2006