highaltitude.log.20060821

[00:05] <jcoxon> right i'm off to bed
[00:05] <jcoxon> i'm beginning to work on this code (but am trying to learn as a i go along
[00:05] <jcoxon> when do you reckon it'll be possible to test?
[00:06] <phatmonkey> errm
[00:06] <phatmonkey> when i get the throttle done
[00:06] <phatmonkey> well, we could compile the code we have here
[00:06] <phatmonkey> and you can run around with the car to see if the navigation and steering work
[00:06] <phatmonkey> hehe
[00:06] <phatmonkey> ... or i could with my car
[00:07] <jcoxon> maybe :-p
[00:07] <jcoxon> right well done spend to much time working on this!
[00:07] <jcoxon> thanks for all the help!
[00:07] <jcoxon> night
[00:07] <phatmonkey> np!
[00:07] <phatmonkey> night
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[01:17] <icez> wb phatmonkey
[01:20] <phatmonkey> hey
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[04:52] <Proffy> evenin'
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[12:20] <rocketboy> whois rocketboy
[12:21] <rocketboy> oops
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[20:37] <a1fa> impressive pictures
[20:39] <phatmonkey> hey a1fa
[20:39] <a1fa> is this your project, phatmonkey ?
[20:40] <phatmonkey> which project? pegasus is jcoxon's
[20:40] <a1fa> i've seen a similar project based in california
[20:40] <phatmonkey> there are loads about, not many in the UK though
[20:41] <a1fa> wow.. the gps picture is pretty cool
[20:41] <a1fa> http://randomsolutions.co.uk/personal/launch/PATH.jpg
[20:44] <a1fa> phatmonkey : you got a project?
[20:53] <phatmonkey> a1fa, yes, http://glider.phatmonkey.org.uk/
[21:00] <a1fa> ah, the glider
[21:00] <a1fa> i am looking at it
[21:00] <a1fa> can you stear it?
[21:01] <a1fa> i had a similar glider, made out of foam
[21:01] <a1fa> it flew 10ft before being shredded by the concrete
[21:01] <a1fa> it had two electric motors with propelers
[21:13] <phatmonkey> yeah
[21:14] <phatmonkey> this one is rather solid
[21:14] <phatmonkey> something rather severe would have to happen for it to break
[21:15] <a1fa> what are the wings made of?
[21:16] <phatmonkey> EPP
[21:16] <phatmonkey> expanded poly propylene
[21:16] <a1fa> what does it feel like? pvc?
[21:16] <phatmonkey> tougher expanded polystyrene
[21:16] <phatmonkey> more flexible and dense
[21:17] <phatmonkey> it's strengthened with stuff similar to duct tape, and covered in PVC tape
[21:17] <a1fa> ah..
[21:17] <phatmonkey> it's a pretty standard arrangement in combat/foamie gliders
[21:18] <phatmonkey> i can think how it could break without some sort of saw!
[21:18] <phatmonkey> it bends to pretty nasty looking angles
[21:20] <a1fa> how much was it?
[21:21] <phatmonkey> £130
[21:21] <a1fa> not bad
[21:21] <a1fa> ~ 200 eur?
[21:21] <phatmonkey> that was inc a speed controller though i believe
[21:21] <phatmonkey> i think just the glider was around £80
[21:21] <phatmonkey> yeah, roughly that
[21:21] <a1fa> thats not bad
[21:22] <a1fa> how do you stear that thing? i know its a glider, but how do you tell it which way to glide
[21:22] <phatmonkey> http://www.hitechrc.co.uk/product_info.php?cPath=32_33&products_id=52
[21:22] <phatmonkey> £80 just for the glider, no electronics
[21:22] <phatmonkey> control surfaces! elevons in this case
[21:22] <phatmonkey> http://en.wikipedia.org/wiki/Control_surfaces
[21:25] <a1fa> oh those things move ?
[21:25] <phatmonkey> they sure do
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[21:25] <a1fa> they got servo?
[21:26] <a1fa> so you will use gumstix with robostix to control your servo?
[21:27] <phatmonkey> yes
[21:27] <phatmonkey> it's also possible to control servos with PWM outputs on the gumstix itself - talk to jcoxon about that
[21:29] <a1fa> hm interesting.. how will you feed it commands? are you going to pre-program the flight?
[21:29] <a1fa> i wonder if it would be possible to put solar panels, and charge the battery so this thing can stay up in the air for days w/o having to come back down
[21:30] <phatmonkey> the flight will be worked out by the glider depending on conditions, but we should have a radio link
[21:31] <phatmonkey> that would be possible, but not at that sort of height!
[21:31] <phatmonkey> a larger glider would be able to stay up with thermals, something this size certainly won't be able to
[21:32] <phatmonkey> NASA has managed to keep an autonomous glider up for a few days purely with thermals, not sure if others have done it
[21:32] <phatmonkey> it is possible to keep airships and things up indefinitely though - chat to kc0wys about that
[22:03] <a1fa> haha
[22:03] <a1fa> i've seen that nasas thing
[22:12] <a1fa> its crazy.. they used it to test 3g
[23:44] <jcoxon> hey all
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[23:49] <phatmonkey> hey jcoxon
[23:50] <jcoxon> heya
[23:50] <jcoxon> can't stay for long
[23:50] <jcoxon> hows everything going?
[23:50] <phatmonkey> been out and doing things... no progress on the car yet
[23:50] <phatmonkey> how's the servo thing going?
[23:50] <phatmonkey> i mgiht try compiling it sometime
[23:50] <jcoxon> well
[23:50] <phatmonkey> i need some sleep now though
[23:50] <jcoxon> i'm planning to do some test programs tomorrow
[23:51] <jcoxon> see what develops
[23:51] <jcoxon> sort of feel that I need to get a feel for how everything should work
[23:51] <phatmonkey> ok
[23:52] <jcoxon> but i've pretty much got the servo code done
[23:52] <jcoxon> its seems to be really very simple
[23:52] <jcoxon> only a couple of lines
[23:52] <phatmonkey> great
[23:52] <jcoxon> its literally a matter of opening up the correct device file
[23:53] <jcoxon> and inputing the position as an int
[23:53] <phatmonkey> yeah
[23:55] <phatmonkey> how are multiple servos handled?
[23:56] <kc0wys> what? i heard my name ;)
[23:56] <phatmonkey> >.>
[23:56] <phatmonkey> <.<
[23:56] <phatmonkey> hi!
[23:56] <kc0wys> hey
[23:56] <jcoxon> either input say "200200" into /dev/mpwm0
[23:56] <jcoxon> or seperately into mpwm0-0 and mpwm0-1
[23:57] <phatmonkey> so how are you going to handle it?
[23:57] <phatmonkey> open multiple devices?
[23:57] <jcoxon> seperately
[23:57] <jcoxon> well when servo_init is called yeah
[23:57] <phatmonkey> add another preprocessor directive for your devices at the top then
[23:57] <jcoxon> guess thats the best way
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[23:58] <jcoxon> in config.h or servo.c?
[23:59] <phatmonkey> at the top of servo.c
[23:59] <phatmonkey> where device is defined
[23:59] <jcoxon> okay will do
[23:59] <phatmonkey> you can just create device1, device2 or whatever
[23:59] <jcoxon> once i've had a fiddle tomorrow with writing some code i'll get it all sorted and commit it
[00:00] --- Tue Aug 22 2006