highaltitude.log.20060112

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[12:26] <jcoxon> synco, if you're around, did you launch yesterday?
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[20:14] <synco> No, became too windy after being delayed by a minor issue.
[20:15] <jcoxon> oh right :-D
[20:15] <jcoxon> asked that Q along time ago :D
[20:15] <synco> However next week I'm going to the middle of nowhere to do some testing.
[20:16] <jcoxon> cool
[20:16] <synco> Sorry for the late reply.... but I like my sleep.
[20:16] <jcoxon> no probs
[20:16] <jcoxon> sleep is good
[20:16] <synco> Especially after flatmates birthday :-D
[20:17] <synco> Did you get your nokia sorted??
[20:17] <jcoxon> well
[20:17] <jcoxon> ...
[20:17] <jcoxon> sort of
[20:17] <jcoxon> have got it communicating
[20:18] <jcoxon> but having to use 2 serial ports to do it
[20:18] <jcoxon> which isn't what i really want
[20:18] <jcoxon> now i have a working system its time to try and free up the 2nd port
[20:18] <synco> ah. What about multiplexing a port?
[20:18] <jcoxon> well the thing is
[20:19] <synco> (use a 4049 analog switch)
[20:19] <jcoxon> that gumstixs cheat - there serial ports actually only have tx, rx and gnd
[20:19] <jcoxon> i also need rts and dtr
[20:19] <jcoxon> so i'm borrowing the second set of tx and rx and making them gpios emulating rts and dtr
[20:20] <jcoxon> the ridiculous thing is that this is to power the conversion circuitry that converts rs232 to TTL for the phone
[20:20] <jcoxon> so i'm really going:
[20:21] <jcoxon> TTL (gumstix) -> rs232 -> TTL (phone)
[20:21] <jcoxon> if i wasn't so lazy i would sort them to interact directly
[20:22] <synco> Sounds more complicated then needed.
[20:22] <jcoxon> it is
[20:22] <synco> So why the rs232 then?
[20:22] <jcoxon> my whole project though is - it could be done with a pic and direct interfacing
[20:23] <jcoxon> the software gnokii that is use expects rs232
[20:23] <jcoxon> and it is there
[20:23] <synco> Ah, does the gumstix output TTL?
[20:23] <jcoxon> yes/no
[20:23] <jcoxon> it has two serial ports
[20:23] <jcoxon> and then lots of TTL pads
[20:24] <synco> Have you looked at simple transistor logic to sort it out???
[20:24] <jcoxon> nope :)
[20:25] <jcoxon> it actually isn't difficult now - just got to provide an alternative power source for the conversion circuirty
[20:25] <jcoxon> its easier then doing anything else
[20:25] <synco> Because as-long as you stay below roughly 115K baud it works well.
[20:26] <jcoxon> interesting - i'm at 19200
[20:27] <jcoxon> it was much easier last time
[20:27] <synco> How did you do it last time??
[20:27] <jcoxon> but now that i have a different model it has fewer rs232 lines
[20:27] <jcoxon> well i had a gumstix but a basix not a connex
[20:27] <jcoxon> and therefore instead of using stuart
[20:28] <jcoxon> i had hwuart
[20:28] <jcoxon> and so had more lines
[20:28] <synco> ok
[20:28] <jcoxon> now i've got the cf gps i will eventually have a spare serial port
[20:29] <synco> So have you wired up an max232 in there somewhere??
[20:29] <jcoxon> the data cable probably has a max232
[20:29] <jcoxon> thats what i'm attempting to power
[20:30] <synco> Can you 'charge' the phone via the data cable??
[20:31] <jcoxon> i can't
[20:31] <jcoxon> the usb data cables can
[20:31] <jcoxon> i think :-)
[20:32] <synco> Wouldn't be easier to buy an off-the-shelf embedded gsm module??
[20:32] <jcoxon> well not really
[20:32] <synco> Only NZ$250 -> 90 pounds
[20:33] <jcoxon> data cable 10pounds, phone already got, gnokii software free
[20:34] <jcoxon> sort of goes against my philosophy
[20:34] <jcoxon> the more experienced i get though the more appealing that approach is
[20:35] <synco> Yeah... it just get harder for anyone else wanting to do it as-well.
[20:38] <phatmonkey> I got a free siemens M20 GSM terminal of somebody which will come in handy
[20:38] <phatmonkey> *off
[20:39] <jcoxon> :-D
[20:39] <phatmonkey> it's much larger than most modern phones though, haha
[20:39] <jcoxon> hehe
[20:39] <phatmonkey> it's designed to use external aerials though, so I'll probablt get much better reception out of it
[20:39] <jcoxon> still got to post you the balloon
[20:39] <jcoxon> :D
[20:39] <phatmonkey> I'm not sure if I'll put it on the glider
[20:39] <phatmonkey> no hurry!
[20:39] <phatmonkey> exams... work... exams... work...
[20:40] <phatmonkey> not really having much time :(
[20:40] <phatmonkey> haven't even got round to ordering a parachute
[20:40] <phatmonkey> it depends how big our glider is actually
[20:40] <phatmonkey> I might consider making a much larger, more stable glider
[20:40] <phatmonkey> with just rudder/elevator
[20:41] <phatmonkey> the thing is though, art's high altitude glider
[20:41] <phatmonkey> he originally used that
[20:41] <phatmonkey> but scrapped it after the glider failed to gain control after release
[20:42] <phatmonkey> the thing is though, if we use a larger glider that, it's going to be so much simple
[20:42] <phatmonkey> and with a large glider, we can experiment with larger payholds
[20:43] <phatmonkey> it could be a direct replacement for the uncontrolled payload regarding carrying payloads and things
[20:43] <phatmonkey> lol
[20:43] <phatmonkey> carrying heavy things rather
[20:43] <phatmonkey> like big cameras and experiments
[20:43] <phatmonkey> ... just that it would fly back to us
[20:44] <jcoxon> true
[20:44] <phatmonkey> I will try to use standard components everywhere
[20:44] <phatmonkey> then I can probably release source code for other people to do it
[20:45] <phatmonkey> hrmph
[20:45] <jcoxon> :-D
[20:45] <phatmonkey> I've got a nice big rudder/elevator glider
[20:45] <phatmonkey> 100"
[20:45] <phatmonkey> but it's scratch build from traditional stuff, so I wouldn't dare put an autopilot on it
[20:46] <phatmonkey> hmmmm
[20:48] <jcoxon> tough one
[21:04] <synco> Ever thought why you use elevator???
[21:06] <synco> Since I don't!!
[21:34] <jcoxon> got it work :D
[21:34] <jcoxon> freed up that serial port
[21:34] <jcoxon> used the gpio lines on the base to provide the power
[21:39] <synco> Congrats.
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[00:00] --- Fri Jan 13 2006