highaltitude.log.20070105

[00:00] <LaurenceB> They were worse but picasa is good at auto correcting contrast/exposure errors
[00:01] <jcoxon> wooohoo fixed the camera
[00:01] <LaurenceB> altho gimp would be the way to go
[00:01] <LaurenceB> cool
[00:01] <jcoxon> its a sony cybershot
[00:01] <LaurenceB> woot
[00:01] <jcoxon> 3.2MP - i've set the focus on infinity
[00:01] <jcoxon> its old
[00:02] <LaurenceB> Eh thought you ment the 6mp one
[00:02] <jcoxon> oh no
[00:02] <LaurenceB> oh well as good as mine
[00:02] <jcoxon> thats totally dead
[00:02] <jcoxon> well it is now ;-)
[00:02] <LaurenceB> thought I had fried mine, but it was a firmware bug
[00:03] <LaurenceB> leaving it overnight with no batteries fixed it
[00:03] <jcoxon> i put 9v through the shutter switch
[00:03] <freakazoid> LaurenceB: how did the problem manifest?
[00:03] <LaurenceB> ouch
[00:03] <freakazoid> My old camera suddenly started taking white pictures
[00:03] <LaurenceB> I used the wrong cable
[00:03] <jcoxon> connected it to the cutdown circuit rather than its trigger mechanism
[00:03] <freakazoid> I assume the iris was stuck open
[00:03] <freakazoid> LaurenceB: I should say what was the symptom?
[00:04] <LaurenceB> dont know that much I'm afraid
[00:04] <LaurenceB> good thing is the main electronics seems to work
[00:05] <LaurenceB> lots of cheap chinese stuff like my camera has very badly coded firmware
[00:06] <LaurenceB> it can hang, and there may be a back up battery to run a real time clock that can keep it stuck when you change the batteries
[00:06] <LaurenceB> always try leaving it for a day or so
[00:08] <LaurenceB> although branded cameras are very different
[00:09] <jcoxon> oooo i've found a lithium 9v
[00:09] <LaurenceB> cut down circuits can introduce noise that screws stuff up
[00:09] <jcoxon> that'll cut the weight a tiny bit more
[00:09] <LaurenceB> i've got one of those on my payload
[00:09] <LaurenceB> 12 hours battery life
[00:10] <icez> that's what you guys need: http://www.pinhole.cz/en/pinholecameras/dirkon_01.html
[00:10] <icez> a cardboard pinhole camera ;)
[00:10] <icez> no stupid electronics
[00:10] <icez> :P
[00:10] <LaurenceB> lol
[00:10] <jcoxon> :-)
[00:10] <freakazoid> we like our stupid electronics!
[00:10] <icez> a little dc motor linked to the processor
[00:10] <icez> and tadam
[00:11] <jcoxon> hehe
[00:12] <LaurenceB> I'm not very experienced with firmware, but isr's can cause the code to harg is the interrupt line has loas of noise on it
[00:12] <LaurenceB> -hang
[00:13] <LaurenceB> this could be the problem I've experienced with shutter bypass circuits
[00:13] <LaurenceB> I'm guessing on most cameras the shutter is an interrupt
[00:14] <LaurenceB> this experience is with bascom tho, which is rather dodgy
[00:15] <LaurenceB> cant work out theoretically why the code cant cope
[00:15] <LaurenceB> could be a problem unique to avr processors
[00:17] <LaurenceB> I should more over to win-gcc but bascom is so easy
[00:17] <LaurenceB> its like visual basic for micros
[00:20] <jcoxon> freakazoid, what sort of systems due you use to control your launch vehicle?
[00:20] <freakazoid> jcoxon: a custom computer developed by Frontier Astronautics
[00:20] <jcoxon> as in processors etc
[00:20] <freakazoid> the processors are mostly atmel microcontrollers
[00:20] <jcoxon> okay - cool
[00:21] <LaurenceB> awesome avrs
[00:24] <LaurenceB> i'm using an atmega2561 on mihab3
[00:24] <LaurenceB> 256k flash mem
[00:25] <LaurenceB> enough to store graphics for the lcd
[00:25] <LaurenceB> Anyway I'm off to bed, hopefully I will be able to fly my glider tomorrow
[00:26] <LaurenceB> cya
[00:26] <jcoxon> night LaurenceB
[00:26] <LaurenceB> cya icez & freakazoid
[00:26] <freakazoid> goodnight LaurenceB
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[00:35] <jcoxon> hmmm i so shouldn't leave things to the last minute
[00:40] <icez> i agree
[00:40] <icez> i do that too:(
[00:48] <jcoxon> hmmm this cutdown device ain't working
[00:48] <jcoxon> oh well - time for bed - will try again tomorrow
[00:48] <icez> cya
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[01:41] <freakazoid> the rest of the world is in such an inconvenient time zone
[01:42] <freakazoid> It was not very smart of us to allow there to be only two English speaking countries in the Americas
[01:54] <icez> hey freakazoid, would you know of anything related to computing and astrophysics that could be of use with rocketry?
[01:55] <icez> as in researching
[01:59] <defy> freakazoid do you post on rcuniverse.com?
[02:52] <freakazoid> no
[02:52] <freakazoid> icez: we always need better/cheaper guidance systems
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[10:46] <LaurenceB> li poly battery is finally here :-)
[10:46] <LaurenceB> ooh and its a still day as well, might do some plane testing
[10:47] <LaurenceB> heres were I smash everything to pieces
[10:50] <LaurenceB> theres a huge disused airfield by my house where people fly rc planes
[10:54] <jcoxon> hey LaurenceB
[10:54] <jcoxon> got a question
[10:54] <jcoxon> how can i lower the voltage on a gpio line by a bit
[10:55] <jcoxon> basically there isn't enough difference between on and off for the cutdown so its always on
[11:01] <LaurenceB> hmmm use a resistor
[11:01] <LaurenceB> or a potential divider
[11:02] <LaurenceB> what is the input impedance of your cut down circuit?
[11:03] <LaurenceB> does the gpio go straight into a transistor gate?
[11:05] <LaurenceB> if the logic 0 voltage is too high you could use a diode or led to get some voltage drop
[11:33] <LaurenceB> i'm off cya
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[21:00] <LaurenceB> hi everyone
[21:00] <icez> hi
[21:00] <LaurenceB> jcoxon, I should be in cambridge by about 4pm or maybe 5
[21:01] <LaurenceB> cool
[21:01] <LaurenceB> that is so cool
[21:02] <icez> jcoxon or the payload sends an email and zeusbot reads the email with the positions
[21:02] <icez> :]
[21:03] <LaurenceB> btw what was the website that freakazoid linked last night
[21:03] <icez> uhm
[21:03] <LaurenceB> the aerospace comany
[21:03] <icez> I'm not _always_ there :p
[21:03] <icez> oh
[21:03] <icez> masten space systems?
[21:03] <icez> http://masten-space.com/
[21:03] <LaurenceB> thats it
[21:03] <LaurenceB> thanks
[21:05] <LaurenceB> how do yuo enter lat long into google maps?
[21:06] <icez> well
[21:06] <LaurenceB> oh think i've got it
[21:06] <LaurenceB> just a comma
[21:06] <icez> ok.
[21:06] <icez> :P
[21:07] <LaurenceB> http://maps.google.co.uk/maps?f=q&hl=en&q=52.2465+,++0.5448+&ie=UTF8&z=10&ll=52.260593,0.545197&spn=0.391698,1.384277&om=1&iwloc=addr
[21:07] <LaurenceB> sorry insane url
[21:07] <icez> :)
[21:08] <icez> didn't know you could put lat/long on it
[21:08] <icez> so much farmlands in the UK..
[21:08] <icez> it's like a jigsaw puzzle
[21:13] <LaurenceB> I've finished the plane :)
[21:13] <icez> cool:)
[21:13] <LaurenceB> Got the li poly battery fitted
[21:13] <LaurenceB> It spot welded the relay closed
[21:14] <icez> :/
[21:14] <LaurenceB> so I had to swap it for a fet
[21:14] <LaurenceB> which has more internal resistance
[21:15] <LaurenceB> I'll see if I can get a proper speed controller for li polys in cambridge
[21:15] <LaurenceB> It's certainly got enough thrust tho
[21:22] <LaurenceB> does anyone live in that field?
[21:22] <LaurenceB> doesn't look like jcoxons house
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[23:22] <LaurenceB> http://wiki.ukhas.org.uk/projects:mihab:glider
[23:22] <LaurenceB> some photos up
[23:23] <LaurenceB> li poly battery in nose
[23:35] <LaurenceB> http://ballon.cnes.fr:8180/html/mir/mir_gb.htm
[23:46] <LaurenceB> okay I'm off cya tomorrow jcoxon
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[00:00] --- Sat Jan 6 2007