highaltitude.log.20070126

[00:04] laurenceb (n=Laurence@cpc2-oxfd9-0-0-cust392.oxfd.cable.ntl.com) joined #highaltitude.
[00:04] <laurenceb> hi everyone
[00:05] <laurenceb> jcoxon, this GPStix you mentioned, do you think the gps works? what is wrong with it?
[00:07] <jcoxon> basically there is no output
[00:07] <jcoxon> i haven't had time to look into it
[00:08] <laurenceb> okay, try applying power and using a multimeter to measure the voltage
[00:08] <laurenceb> on the serial, be very careful
[00:08] <jcoxon> one minute
[00:09] <laurenceb> not to short anything, you should see approx 1/2 supply and fluctuating
[00:13] <laurenceb> not sure how you could get to the serial, main gumstix board?
[00:15] <jcoxon> oh it comes out nicely
[00:15] <jcoxon> as in the serial ports are accessible
[00:15] <laurenceb> if the gps won't work, I'll probably be better with a rate gyro
[00:15] <jcoxon> though i get 3.3v off rxd
[00:15] <laurenceb> hmm
[00:17] <jcoxon> and the pin that actually comes off the module is 3.3
[00:17] <jcoxon> there however is a set of pins
[00:17] <jcoxon> that are oscilating between 1.8 and 3.3
[00:17] <laurenceb> but what do they do?
[00:17] <laurenceb> http://pubs.gumstix.com/boards/AUDIOSTIX/PCB00012-R791/PCB00012-R791_LEA.png
[00:18] <jcoxon> just grabbing the data sheet
[00:18] <defy> hey guys
[00:18] <laurenceb> hi
[00:19] <jcoxon> hmmmm just N/C
[00:19] <jcoxon> that makes no sense
[00:20] <laurenceb> but suggests module not fried?
[00:20] <laurenceb> are you sure you had TXD from module not RXD to module?
[00:24] <jcoxon> oops wrong data sheet
[00:25] <laurenceb> use mine from above
[00:27] <laurenceb> seems to list all pins
[00:30] <jcoxon> got the right one
[00:30] <jcoxon> still seems odd
[00:30] <laurenceb> how come?
[00:31] <jcoxon> not sure
[00:32] <laurenceb> what soes
[00:32] <jcoxon> pins 23 and 24 are oscillating
[00:33] <laurenceb> well 24 is usb!
[00:33] <laurenceb> what about pin 3?
[00:33] <jcoxon> yup i know
[00:33] <jcoxon> but 23 ain't
[00:34] <jcoxon> right i've got to go to bed
[00:34] <jcoxon> will talk about this another time
[00:34] <laurenceb> hang on
[00:34] <laurenceb> whats pin 3 say?
[00:35] <laurenceb> ie voltage
[00:35] <jcoxon> 3.27
[00:35] <laurenceb> and pin 4
[00:35] <laurenceb> steady?
[00:35] <jcoxon> same
[00:35] <jcoxon> yup
[00:35] <jcoxon> both steady
[00:35] <laurenceb> ok poss fried
[00:35] <laurenceb> cya then
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[00:36] <laurenceb> grr
[00:36] <laurenceb> anyone know a high update rate gps??
[00:36] <laurenceb> ie > 1hz
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[01:00] <laurenceb> or a source of cheap rate gyros?
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[01:35] <laurenceb> I'm off cya all
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[23:02] <rjmunro> What are the rules on amateur weather balloons in the UK?
[23:02] <rjmunro> http://www.caa.co.uk/ doesn't seem to mention them.
[23:08] <icez> well
[23:08] <icez> there are a few specific radiowaves you can use
[23:10] <rjmunro> Is there somewhere I can read the rules?
[23:11] <icez> well, we were suposed to have someone write them on our wiki...but I guess not
[23:11] <icez> and unfortunately I'm not in the UK:(
[23:11] <icez> you could wait for jcoxon/laurenceB to come by
[23:13] <rjmunro> I'm interested in taking aerial photos for OpenStreetMap. I.e. straight down with a few cms per pixel of the ground.
[23:14] <icez> cool
[23:14] <rjmunro> I know absolutely nothing about it, though.
[23:15] <icez> well there's a bunch of people here that have done it a few times before
[23:15] <rjmunro> Could you make a balloon that when it reached the right altitude vented gas so that it stayed there, rather than headed for space?
[23:16] <icez> It will never reach space
[23:16] <icez> and you could regulate the balloon with a valve
[23:16] <icez> http://wiki.ukhas.org.uk/ideas:helium_valve
[23:16] <rjmunro> I meand "space" was a figure of speech :-)
[23:16] <icez> ok;p
[23:17] <rjmunro> I don't want to go too high because I want good ground photos.
[23:17] <icez> also it's hard to control the path so you might not get nice squares like satellites :p
[23:19] <rjmunro> Sure, but the idea is to get a string of photos that overlap, then attempt to join them.
[23:19] <icez> yeah
[23:19] <icez> you'd need a lot of storage probably
[23:20] <rjmunro> What kind of weight can you carry?
[23:21] <icez> uhm
[23:22] <icez> most I know are between 1-2kg
[23:22] <rjmunro> A desktop HD is about 500 grams, and can store 500Gb
[23:22] <icez> uhm
[23:23] <rjmunro> Power might be an issue.
[23:23] <icez> i don't think the harddrive is suitable for the temperatures and humidity
[23:23] <icez> but i'm not certain :)
[23:25] <icez> although there are 4-gb flash devices
[23:25] <rjmunro> Or, if you keep the altitude in range, you could download pictures live at 54Mbs over IEEE802.11.
[23:25] <icez> someone even stripped a laptop and used it as a main computer :)
[00:00] --- Sat Jan 27 2007