highaltitude.log.20100509

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[10:43] <Rjharrison_> Morning all any launches planed today or yesterday?
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[11:36] <Hiena> brb
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[11:41] <SpeedEvil> Oh no - the endless waiting!
[11:46] <DanielRichman> ADC, MAX 195 http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1040, has VSSA and VSSD pins which seem to want ~ -5V; and indeed the MAX195 offers a "bipolar input range"... but if I just want to use it in "unipolar 0V - Vref" mode, do I have to supply a -5V to VSSA and VSSD?
[11:48] <DanielRichman> the datasheet doesn't seem to specify
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[15:49] <ki6ymz> any idea why my ntx2 will only transmit about 30 characters before turning to gibberish?
[15:49] <ki6ymz> I'm using this rtty code: http://www.pegasushabproject.org.uk/wiki/doku.php/ideas:notes
[15:49] <ki6ymz> (this is stilldavid, by the way)
[15:50] <SpeedEvil> Is about = 32?
[15:50] <ki6ymz> yes, but sometimes 33 or 34, sometimes 31
[15:50] <ki6ymz> first thing I thought of, power of 2
[15:51] <SpeedEvil> nothing leaps out at me
[15:51] <ki6ymz> using the above code, if I call rtty_txstring(32+ chars) it breaks
[15:51] <ki6ymz> but I can call rtty_txstring(15 chars) multiple times in a row
[15:52] <SpeedEvil> What does it do whan it prints garbage?
[15:52] <SpeedEvil> Does it carry on 'forever' ?
[15:52] <ki6ymz> it sounds like it's still transmitting, but the transmission breaks
[15:53] <SpeedEvil> I would try
[15:53] <SpeedEvil> while(1){
[15:53] <SpeedEvil> tx('A')
[15:54] <SpeedEvil> tx('B')
[15:54] <SpeedEvil> }
[15:54] <SpeedEvil> Tehre has to be some reason...
[15:54] <SpeedEvil> Umm
[15:54] <ki6ymz> uploading sketch...
[15:55] <SpeedEvil> Could the stop or start bit be relying on inter-char delay?
[15:56] <ki6ymz> hah, 32 As and Bs exactly, then it printed a dozen or so open parenthesis, then stopped
[15:56] <ki6ymz> weird, then it stopped for ~30 secs, printed a few tab characters, then repeated
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[15:58] <ki6ymz> alright, SpeedEvil one other thing for you then: since sprintf() doesn't like printing floats, what's a good way around that?
[15:58] <SpeedEvil> DEcoupling?
[15:58] <SpeedEvil> sprintf doesn't like floats - how
[15:58] <SpeedEvil> oh
[15:58] <SpeedEvil> right - it's 8 bit, it'll be huge
[15:58] <ki6ymz> on the arduino, it's apparently disabled at the compiler level
[15:58] <SpeedEvil> Simply use fixed point
[15:59] <ki6ymz> for sprinting gps data I get a "?:
[15:59] <ki6ymz> er, "?"
[15:59] <SpeedEvil> Or handle the degrees/and the remainder seperately
[15:59] <SpeedEvil> Implementing a float class on 8 bit hardware will take most of a K
[16:00] <ki6ymz> would be nice to be able to xmit as decimal, though
[16:00] <ki6ymz> I've got room to spare on the board...
[16:03] <SpeedEvil> Umm
[16:04] <SpeedEvil> there was code on how (not) to do this back in the logs - I can't remember which mission - it was about a couple of months ago, and had problems with crossing the meridian
[16:06] <ki6ymz> If this payload gets that far, I think I've got bigger problems
[16:06] <SpeedEvil> where are you?
[16:06] <SpeedEvil> $GPRMC,123519,A,4807.038,N,01131.000,E,022.4,084.4,230394,003.1,W*6A
[16:06] <ki6ymz> Colorado, USA
[16:06] <SpeedEvil> Ah.
[16:06] <SpeedEvil> No problem with either then :)
[16:06] <SpeedEvil> In the above - you'd - generally.
[16:06] <SpeedEvil> Loop over the above string, if you don't hit a , or a
[16:07] <SpeedEvil> \n, you add it to the current token.
[16:07] <SpeedEvil> Taking care that teh token doesn't overfill your buffer of course.
[16:07] <SpeedEvil> Then you have a big case statement on a number - which gets incremented after each token, and zeroed at newline
[16:08] <SpeedEvil> So - the first case is something like 'if(token=="$GPGRMC")flag=1;break
[16:08] <SpeedEvil> The one dealing with teh latitude would be something like:
[16:09] <SpeedEvil> Split off the first two chars - call atoi() on them - store in 'intlat'
[16:09] <ki6ymz> I've been playing with the GPS code from Project Horus
[16:09] <SpeedEvil> this gives 48
[16:09] <ki6ymz> okay...
[16:10] <SpeedEvil> now - split 07.038 into 07 and 038, and the decimal position is 07*60+38
[16:10] <ki6ymz> that's a lot simpler than I thought, really.
[16:10] <SpeedEvil> sorry - tired
[16:11] <ki6ymz> np, I just woke up :)
[16:11] <SpeedEvil> but you basically end up with something like 'print intlat"."remainder'
[16:11] <SpeedEvil> where both parts are integers
[16:11] <ki6ymz> ah, so pass two ints by reference to the function or something?
[16:12] <ki6ymz> that sounds like a good solution, and a lot faster than using floats
[16:13] <SpeedEvil> ki6ymz: That, or globals.
[16:14] <ki6ymz> good call
[16:14] <SpeedEvil> ki6ymz: Sometimes 'bad' practices like global variables can actually be sane in small systems.
[16:14] <SpeedEvil> As they can save lots of code space.
[16:14] <ki6ymz> yeah, I'm using globals for just about every other bit of sensor data, makes sense to use it for gps too
[16:15] <ki6ymz> alright, I'll hack on this, thanks for your help!
[16:15] <ki6ymz> (Launching a week from today, weather permitting!)
[16:15] <SpeedEvil> Woo!
[16:16] <SpeedEvil> See http://qkwv.com/bat.jpg
[16:16] <SpeedEvil> err
[16:16] <SpeedEvil> not that.
[16:16] <SpeedEvil> not very sfw
[16:16] <ki6ymz> ...
[16:16] <SpeedEvil> http://ukhas.org.uk/guides:pre_launch_checklist
[16:16] <SpeedEvil> that
[16:16] <ki6ymz> ah, right
[16:17] <ki6ymz> still haven't found the right number to call to send out a NOTAM
[16:17] <ki6ymz> might just wing it and hope for the best
[16:18] <DanielRichman> SpeedEvil, re earlier on ##electronics: I wired up the max195 and it didn't work (just returned 0xffff for any and every voltage) until I added the 3 way power supply.
[16:18] <SpeedEvil> :/
[16:18] <SpeedEvil> Annoying
[16:18] <DanielRichman> indeed
[16:18] <DanielRichman> any practical way to make a -5, 0v, 5v power supply from just a regulated 5v input?
[16:18] <DanielRichman> I mean, I could do it I guess if I had 10V
[16:19] <SpeedEvil> DanielRichman: many
[16:19] <SpeedEvil> Charge pump chip is possibly the easiest.
[16:19] <SpeedEvil> If the calue is not too critical - a 9V bat.
[16:19] <DanielRichman> the adc is quite specific about its supply voltages
[16:19] <DanielRichman> wants +- 4.75-5.25
[16:20] <SpeedEvil> k
[16:20] <DanielRichman> SpeedEvil, i'll look at a charge pump chip, but, alternatively, can you recommend an alternative 16bit ADC?
[16:21] <SpeedEvil> Sorry - no.
[16:21] <SpeedEvil> Not looked at for a while
[16:22] <DanielRichman> np thanks for your help
[16:22] <SpeedEvil> just see what's available in DIP - if that matters - and has single supplies
[16:22] <DanielRichman> yeah the max195 was my choice via those filters on maxim's site; shame I didn't realise it didn't work w/o -5
[16:25] <SpeedEvil> I would contact them, about the error
[16:25] <SpeedEvil> Ok - the datasheet is ambiguous - fair enough
[16:25] <SpeedEvil> but the parametric selector is flat-out wrong
[16:25] <SpeedEvil> (also for the 194)
[16:26] <SpeedEvil> Also
[16:26] <jonsowman> DanielRichman: does it have to be 16bit?
[16:26] <SpeedEvil> Don't select stuff you can live with as excluders
[16:26] <SpeedEvil> http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3965
[16:27] <SpeedEvil> for example
[16:27] <DanielRichman> jonsowman, not really
[16:27] <SpeedEvil> you don't care it has 2 channels not one - for example
[16:27] <DanielRichman> SpeedEvil, had that page open :P
[16:27] <jonsowman> the MAX187 is a really nice easy to use SPI 12bit
[16:27] <DanielRichman> looks like i'll order some more samples
[16:27] <DanielRichman> along with an email about the 195
[16:27] <SpeedEvil> :)
[16:27] <jonsowman> if your sensor is really noise-free and accurate enough to warrant 16bit then go for it
[16:27] <jonsowman> but you might be okay with 12
[16:28] <SpeedEvil> what's this connected to again, I forgot
[16:28] <DanielRichman> Ok
[16:37] <DanielRichman> SpeedEvil, to the receiving counterpart of the ntx2
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[16:49] <SpeedEvil> that seems overkill
[16:49] <DanielRichman> probably
[16:49] <SpeedEvil> the noise is almost certainly going to _drastically_ exceed the ADC res
[16:49] <SpeedEvil> so you get 99% of the same effect by averaging a smaller width adc
[16:50] <DanielRichman> mmm
[16:51] <DanielRichman> jonsowman, if you've used the max187 before: when you did, did you find a eagle lbr for the maxim parts//do you know of one?
[16:51] <jonsowman> don't know, sorry, haven't used eagle for a PCB with maxim parts
[16:52] <DanielRichman> for a dip shouldn't be too much effort to make one but may as well check if there is one before I do so
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[18:22] <edmoore> useless child
[18:35] <Hiena> Ehehehe...
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[19:06] <rjharrison> PINg DanielRichman
[19:06] <rjharrison> Hi edmoore
[19:06] <edmoore> hi
[19:06] <edmoore> ]
[19:06] <rjharrison> Exams over then
[19:07] <rjharrison> Beer drunk
[19:07] <rjharrison> DanielRichman, Are these suitable for your needs http://uk.farnell.com/jsp/search/productdetail.jsp?SKU=1332112
[19:07] <edmoore> a wee bit! though not out of the woods yet
[19:07] <rjharrison> Ok so no HABing yet
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[19:09] <edmoore> nope
[19:10] <rjharrison> I'm just unpacking the car having been to Reading for teh w/e
[19:10] <edmoore> cool
[19:10] <edmoore> i've been in london
[19:11] <edmoore> having an easy evening
[19:11] <edmoore> just setting up a latex document for my thesis
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[19:13] <junderwood> most people use paper
[19:14] <edmoore> i doesn't feel so good against my skin
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[19:19] <Lunar_Lander> hello
[19:20] <edmoore> what c library is EXIT_SUCCESS etc in anyone?
[19:20] <edmoore> stdlib. gimf
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[22:45] Nick change: SpeedEvil1 -> SpeedEvil
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[00:00] --- Mon May 10 2010