highaltitude.log.20061107

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[02:34] <d123> evening
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[17:31] Action: jcoxon is building Pegasus IV :-D
[17:32] <jcoxon> its going to be an experiment at sheer cheapness
[17:35] <icez> =]
[17:36] <icez> so it's not an automated trip around the world ?:)
[17:36] <jcoxon> hehe
[17:37] <jcoxon> gonna be a motorola WR850G running openwrt, rockwell ttl gps and a nokia 5110
[17:37] <icez> and a cam?
[17:38] <jcoxon> haven't thought of that
[17:39] <jcoxon> i can get up to 7 GPIOs working
[17:39] <jcoxon> so triggering a camera wouldn't be difficult
[17:40] <jcoxon> the router cost me £20 in total
[17:40] <jcoxon> the gps £11.50
[17:43] <icez> too bad the camera/cellphone doesn't have a built-in thermometer
[17:45] <jcoxon> well i might be able to get i2c working on the router
[17:45] <jcoxon> and therefore open up a load of things
[17:47] <phatmonkey> nice!
[17:48] <jcoxon> i got bored - thought i'd see the cheapest payload i could make
[17:48] <phatmonkey> i've been starting to think about software for something on a parafoil
[17:48] <phatmonkey> yeah
[17:48] <phatmonkey> no reply from the parafoil guy yet
[17:48] <jcoxon> a openwrt router is quite accessible for a lot of people
[17:48] <phatmonkey> is that all that's needed?
[17:48] <jcoxon> and the openwrt will certainly be interestted
[17:48] <phatmonkey> except batteries i guess
[17:48] <jcoxon> well i would need a mobile phone as well
[17:48] <jcoxon> and batteries
[17:49] <jcoxon> (its got 2 serial ports apparently
[17:49] <icez> yeah those routers are amazing :]
[17:50] <jcoxon> actually i also need a mcx antenna
[17:53] <jcoxon> so thats £20 + £11 + £4 for the nokia cable + batteries + mcx antenna
[17:55] <jcoxon> so about £45 in total with out parachute or balloon/helium
[17:57] <jcoxon> bbl
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[20:26] <jcoxon> hey rocketboy
[20:26] <jcoxon> thanks for hte email - might actually have a payload ready to launch soon
[20:33] <rocketboy> hi jcoxon - sounds good - I havn't got much further - I might get my *** in gear by the December ERAS launch
[20:34] <rocketboy> (I have also emailed Laurence about it)
[20:35] <rocketboy> what are you planning to fly?
[20:38] <jcoxon> :-) give me a couple more minutes - i'm updating my website - all will be revealed...
[20:40] <rocketboy> no probs - I managed to get some fine (1.5mm dia) nylon (platted/braided) cord today - ideal for attaching the payload - about 45Kg breaking strain.
[20:40] <jcoxon> nice
[20:41] <jcoxon> i hear you tested some tube launching rocket stuff
[20:41] <jcoxon> henry mentioned in a nova meeting yesterday
[20:42] <rocketboy> yeah - it somthing a played with a couple of years back - it gives the rocket a real boost at launch
[20:43] <jcoxon> he seemed inspired by it :-)
[20:43] <rocketboy> but it would also be good for a baloon launch - as it gets the rocket accelerated to stabilization speed in a very short length of space
[20:44] <rocketboy> yeah - I think they were all impressed - it was a good job i thought to dig it out before i went - I almost didn't
[20:45] <rocketboy> The tube launcher is just the sort of project i like - simple but effective
[20:47] <jcoxon> like all this should be :-)
[20:48] <rocketboy> yep - thats why I find it so interesting.
[20:48] <jcoxon> i think you might like my new payload - though its a little pointless...
[20:48] <jcoxon> (nearly finished writing the page)
[20:50] <phatmonkey> i'm not sure how soon my launch will be
[20:50] <phatmonkey> i've suddenly become enthusiastic about it again
[20:50] <phatmonkey> jcoxon, are you having radio?
[20:51] <phatmonkey> it woul dbe nice to send up something to test my gear
[20:52] <rocketboy> phat - how are you getting on with the thermopile sensors?
[20:53] <phatmonkey> they worked great, i just never got the time to write a decent algorithm to estimate attitude
[20:53] <rocketboy> I wa thinking that thee weer just as applicable to pointing a rocket upward?
[20:53] <rocketboy> they were
[20:53] <phatmonkey> they would be great for stabilising rockets
[20:54] <phatmonkey> i might have another look through paparazzi's code to pick out some ideas
[20:54] <phatmonkey> there code is so obfuscated and compacted (undocumented meaningless variables everywhere, sigh), it's quite impossible to understand what's going
[20:55] <rocketboy> what is it written in?
[20:55] <phatmonkey> C
[20:56] <rocketboy> humm - is it worth me taking a look - i was thinking that I started to write C before most of you guys were born (I started in 1980)
[20:56] <phatmonkey> crikey
[20:56] <phatmonkey> i'll link you!
[20:57] <phatmonkey> http://www.nongnu.org/paparazzi/download.html
[20:57] <phatmonkey> it's all in sw/airborne/infrared.c
[20:57] <phatmonkey> i haven't looked at it for months, maybe a fresh look will help
[20:58] <phatmonkey> anyway, bbl
[20:58] <phatmonkey> (or maybe it's just that i don't understand the maths in it :D)
[20:59] <rocketboy> ok - will let you know what I make of it
[20:59] <jcoxon> right here you go:
[20:59] <jcoxon> http://www.pegasushabproject.org.uk/pegasus4.html
[21:00] <jcoxon> its pretty lame but hey
[21:05] <rocketboy> looks good - like the project ains - nice and minimal
[21:06] <rocketboy> what is the 10 or so wires on the upper D connector going to?
[21:08] <rocketboy> oops - I see the photo is the old plan
[21:09] <rocketboy> so the plan is to re-program the router?
[21:09] <jcoxon> yup
[21:09] <jcoxon> there is an open version that can be easily flashed onto the router
[21:10] <rocketboy> excellent - a really cheap way of getting going
[21:11] <jcoxon> i reckon the payload itself will be about £50
[21:11] <jcoxon> should be pretty easy to replicate
[21:12] <jcoxon> (though i'm not giving up on my gumstixs :-D )
[21:12] <rocketboy> That takes some beating
[21:12] <rocketboy> so what is the programming environment - is there an OS?
[21:12] <jcoxon> linux :-D
[21:13] <jcoxon> basically they were forced by the gpl to release the code which has been updated to be easy to work with
[21:13] <jcoxon> i've got a customised wireless router at home
[21:13] <jcoxon> using hte same system
[21:13] <jcoxon> really really easy
[21:14] <rocketboy> Thats interesting - I have a Flowpoint router that looks remarkably unix like when you boot it up (only 1 serial port though)
[21:17] <jcoxon> the ethernet could be used?
[21:17] <jcoxon> also they've written a kernel driver to use GPIOS to create a i2c bus
[21:18] <rocketboy> I guess
[21:18] <rocketboy> is there any flash?
[21:18] <jcoxon> 4mb :(
[21:18] <jcoxon> however i can easily strip the filesytem to less then 1.5mb
[21:18] <jcoxon> so that'll give enough space for logs
[21:19] <jcoxon> thats one thing i'm good at - i used to maintain a floppy distro for 386s with 4mb of ram
[21:20] <jcoxon> got 16mb of ram though
[21:20] <rocketboy> 2.5mb of spare falsh is pleanty
[21:22] <jcoxon> what really attacts me is that you can use the wireless to login and check everything is working before launch
[21:22] <jcoxon> so you can close it all up before hand
[21:22] <rocketboy> ha - my 1st home computer had 1K of ram (ZX81) - I managed to write a satellite tracking program - 16mb luxury
[21:22] <jcoxon> hehe
[21:23] <jcoxon> my 386 at home has 7mb
[21:23] <jcoxon> had it running X and all
[21:23] <rocketboy> exactly - windows is bloated
[21:26] <rocketboy> wireless login is a great idea
[21:27] <jcoxon> would the wireless have to be off (legally) during flight?
[21:28] <rocketboy> I guess - do you know what frequency it is?
[21:28] <jcoxon> 2.4ghz
[21:28] <jcoxon> standard 802.11b
[21:30] <rocketboy> humm - might be OK ish - possibly might quilify - hang on I'll look
[21:32] <jcoxon> rocketboy, sorry got to dash - will be on later...
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[00:00] --- Wed Nov 8 2006