highaltitude.log.20061122

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[13:22] <Ollii||> Hi
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[13:48] <icez> hi jcoxon
[13:49] <jcoxon> hey icez
[13:49] <icez> how are you?
[13:55] <jcoxon> good thanks
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[18:33] <mc-> hi all
[18:33] <mc-> Just been playing with a servo and a pic. I've converted my servo into a winch
[18:34] <mc-> to steer a parachute. Standard servos aren't powerful enough.
[18:35] <mc-> Now I can send a long pulse and it will turn clockwise, and a short pulse to turn anti-clockwise
[18:36] <rocketboy> How big a parachute/servo are we talking about
[18:37] <mc-> Hi rocketboy, my chute is tiny, but I guess it could get up to high speeds.
[18:37] <mc-> I was using a jcoxon idea, of a steerable tail fin on the back of a parafoil.
[18:43] <rocketboy> I'm looking for a video clip of a powered model paraglider 50" wing-sapn that seems to use a standard RC servco to steer
[18:44] <mc-> that would be good to see, but it wouldn't be coming down from 100k ft.
[18:44] <mc-> Maybe it's better not to try and steer until at lower altitudes/speeds.
[18:45] <rocketboy> Yeah - I think that is the approch these guys use http://www.gpsboomerang.com/
[18:49] <rocketboy> here is that video http://www.rcfun.co.uk/avifiles/skysurf.wmv
[18:50] <mc-> the gpsboomerang says its glide slope is 5:1 below 10km, so I think you're right
[18:53] <mc-> I like the video.
[18:59] <rocketboy> I like the launch - clearly needs some forward motion to inflate the wing
[19:04] <mc-> I built a chute out of a plastic bag, and a plastic tube as a wing spar.
[19:05] <mc-> Just wanted to see if it's possible to build something very cheap and cheerful
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[20:25] <jcoxon> hey rocketboy
[20:26] <rocketboy> hiya - I got the WR850 today
[20:26] <jcoxon> cool :-D
[20:26] <rocketboy> I opened it up - what a bu**er
[20:27] <rocketboy> seem to be able to talk to it ok
[20:27] <jcoxon> its a tough cookie to crack open
[20:27] <rocketboy> you \re not kidding
[20:27] <rocketboy> its got the 2 x 8Mbyte chips
[20:27] <jcoxon> right
[20:27] <jcoxon> don't need any more
[20:28] <icez> :D
[20:28] <rocketboy> smaller than i thought it would be
[20:28] <jcoxon> hehe i was chatting to [mbm] on #openwrt last night about it
[20:28] <jcoxon> its famous for being so hard to open
[20:28] <jcoxon> [mbm] is the lead dev on openwrt
[20:28] <rocketboy> ah - ok
[20:28] <jcoxon> he said that we should keep him informed of our progress
[20:28] <rocketboy> he/she is doing a good job
[20:29] <jcoxon> would like to put it on website if it all works
[20:29] <jcoxon> i guess its a he but you never know
[20:29] <rocketboy> the chips get warmer than i thought
[20:29] <jcoxon> yeah they get quite hot
[20:30] <icez> that won't really matter once they are at 10000 ft in the air :]
[20:30] <rocketboy> I cant keep my finger on a couple of them
[20:30] <jcoxon> i've had it running for a good couple of hours
[20:30] <jcoxon> haven't had an issue
[20:31] <rocketboy> dissapating heat in a vaccuume can be a problem - no convection - may need some heat pipes
[20:31] <icez> in a vaccuum?!
[20:31] <icez> you're going that far?:/
[20:32] <jcoxon> icez, well less then 1%
[20:32] <rocketboy> well 1% air density
[20:32] <rocketboy> still its quite cold
[20:34] <icez> rocketboy, have you launched something yet?
[20:34] <rocketboy> nah
[20:35] <jcoxon> rocketboy whats your plan then for the wr850g?
[20:35] <rocketboy> not sure yet
[20:35] <rocketboy> could use it like a cheap gumstix
[20:36] <rocketboy> or may not use it for ballooning at all
[20:36] <rocketboy> (I need a wifi router anyhow)
[20:37] <rocketboy> I thought it was 802.11b - but it does 802.11g as well
[20:37] <rocketboy> anyway for £5.99 + postage I cant go wrong
[20:38] <jcoxon> very true, very true
[20:38] <jcoxon> if you could find the gpio solder points i'd be eternally grateful
[20:38] <jcoxon> seems like the documented positions aren't the same as on my version
[20:39] <jcoxon> only need 2 :-D
[20:39] <jcoxon> for i2c
[20:39] <rocketboy> hang on ill take a look at mine
[20:40] <jcoxon> thanks :-D
[20:40] Action: jcoxon is desperately fighting these stats - not sure i care about gambian intestinal permeability data anymore
[20:42] <jcoxon> just to help: http://wiki.openwrt.org/OpenWrtDocs/Hardware/Motorola/WR850G#head-da2bdb452d87c9710dd95170312480665d7a5917-2
[20:49] <rocketboy> humm - so are you trying to track these back to a suitable point on the board?
[20:49] <rocketboy> like it says gpio0 is the wireless led?
[20:50] <rocketboy> so you want to know a good place to pick it up
[20:50] <jcoxon> i know about gpio0 and also 1
[20:50] <jcoxon> and the input button attached to the reset button
[20:51] <jcoxon> however
[20:51] <jcoxon> the docs say gpio 2 etc come out from other pads/places
[20:51] <jcoxon> yet when i found these toggling hte gpio didn't work
[20:52] <rocketboy> it says "GPIO2 empty pad below RC117 (bottom solder pad)" - but I cant find RC117 - unless its underneith
[20:53] <jcoxon> its underneath
[20:53] <jcoxon> and isn't an empty pad on mine
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[20:54] <jcoxon> evening mc-
[20:54] <mc-> rocketboy, I've just found a gyro, do you have any use for it?
[20:54] <mc-> evening jcoxon
[20:55] <rocketboy> absolutly
[20:55] <rocketboy> what sort is it mc?
[20:55] <mc-> it's a murata peizo gyro used for automotive,
[20:56] <mc-> the markings on it say 05G 339...
[20:57] <rocketboy> yeah that would be fun
[20:57] <mc-> from what I remember, you can interface it with just an op-amp, then an ADC
[20:58] <jcoxon> :-)
[20:58] <rocketboy> jcoxon - it it possible they think RR34 is RC117 and that the empty pads RR151 are what they are talking about
[20:59] <rocketboy> sounds good to me mc
[20:59] <rocketboy> I guess the output is a signal proportional to rate of turn
[21:01] <jcoxon> rocketboy i don't have it in front of me
[21:01] <jcoxon> will have to look later
[21:01] <jcoxon> i'm in the college computer room using their stats software
[21:02] <rocketboy> so which chip do the GPIO come out of - the main processor?
[21:03] <jcoxon> i assume so
[21:03] <jcoxon> the seem to find the points by trial and error, toggle the gpio and use a multimeter to detect it
[21:03] <jcoxon> they*
[21:05] <rocketboy> mc - have you got a spec shhet for the gyro?
[21:05] <rocketboy> sheet
[21:07] <mc-> was just looking on the murata site, couldn't find anything
[21:08] <mc-> it's a ENV-05G, I've found a pic of it
[21:08] <mc-> costs $59
[21:10] <mc-> got a pin-out now..will email
[21:11] <rocketboy> ta
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[21:25] <jcoxon> evening defy
[21:26] <defy> hey :) hows it going
[21:26] <jcoxon> good thanks - i'm multitasking talking on here and doing my stats practical
[21:26] <defy> hehe
[21:28] <mc-> rocketboy, I couldn't resist wiring up the gyro, it works great.
[21:29] <defy> has anyone launched lately?
[21:31] <jcoxon> nova 2 launched on sunday
[21:32] <jcoxon> however its believed to have ditched into the sea
[21:32] <jcoxon> last radio contact was out between the UK and holland
[21:33] <defy> doh :( were any pictures gotten from it?
[21:34] <jcoxon> no sadly not
[21:34] <jcoxon> all self contained
[21:34] <jcoxon> it was quite a loss, 3 cameras, 2 sensor boards
[21:34] <jcoxon> bottle of port
[21:41] <defy> that sucks :(
[21:48] <mc-> jcoxon, did you get my email with the GPS co-ordinates?
[21:50] <jcoxon> yup
[21:50] <jcoxon> i thought i replied
[21:50] <mc-> ah, didn't get a reply..spam filter somewhere?
[21:51] <jcoxon> i replied to the email you sent today
[21:52] <mc-> didn't get that either..
[21:55] <jcoxon> hmmmmmm
[21:55] <mc-> looking forward to finishing a steerable chute..could make recovery much easier..
[21:56] <jcoxon> its certainly an interesting idea
[21:56] <jcoxon> was only theoretical of course (well until now!)
[21:56] <jcoxon> shall i send the email again?
[21:56] <mc-> ok
[21:57] <jcoxon> done
[22:02] <mc-> the problem must be my side, haven't received a test email..must sleep now.
[22:02] <jcoxon> np
[22:02] <jcoxon> i've got to go as well
[22:02] <jcoxon> bbl
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[00:00] --- Thu Nov 23 2006