highaltitude.log.20091101

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[10:41] <MikeMc_> Morning
[10:41] <MikeMc_> and what a lovely fine sunny morning it is too
[10:41] <MikeMc_> NOT!!!
[10:42] <SpeedEvil> Raining heavily here.
[10:43] <MikeMc_> same here
[10:43] <MikeMc_> i was being facetious
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[10:48] <SpeedEvil> Yes, I gathered that
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[11:54] <juxta> ahh, it's almost summer here :)
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[12:23] <MikeMc> :P
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[12:27] <SpeedEvil> "" winter
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[13:23] <edmoore> Greetings all
[13:23] <Randomskk> heya
[13:23] <edmoore> SpikeUK: How was bcl in the end?
[13:23] <edmoore> Hi Adam
[13:24] <edmoore> Am down in Sussex for mum's bray
[13:24] <edmoore> All well with you?
[13:24] <Randomskk> yup, not bad
[13:24] <edmoore> Bray = bday
[13:24] <Randomskk> plenty of work to get done at some point today, but that's par for the course
[13:24] <edmoore> You needn't remind me
[13:24] <Randomskk> :P
[13:25] <edmoore> Am doing a gold Phoenix panel this week
[13:26] <edmoore> May ask youto check over Berbers and make sure I don't make any silly layer mistakes
[13:26] <edmoore> Gerbers
[13:26] <Randomskk> sure thing. what's it of?
[13:26] <edmoore> Damn iPhone autocorrection
[13:26] <edmoore> Stuff for hobble
[13:27] <edmoore> You mentioned you had acouple of minor mistakes with silkscreen so may check I don't do the same
[13:27] <Randomskk> the vanishing silkscreen?
[13:27] <edmoore> Right, off for lunch
[13:27] <Randomskk> seeya
[13:27] <edmoore> See you
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[19:20] <rjharrison> evening all
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[19:54] <jcoxon> evening all
[19:54] Action: jcoxon is on the train so might disappear...
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[20:42] <jcoxon> hey all
[20:42] <jcoxon> does anyone have a good temperature/flight time graph?
[20:42] <jcoxon> rjharrison, ?
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[20:53] <jcoxon_> oops :-p
[20:55] <juxta> hi jcoxon
[20:55] <jcoxon_> hey juxta
[20:56] <jcoxon_> hows the payload going?
[20:56] <juxta> pretty good thanks :)
[20:56] <juxta> got my radiometrix doing RTTY
[20:56] <jcoxon_> amazing
[20:56] <jcoxon_> what method?
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[20:57] <juxta> 2 pins, voltage dividers
[20:58] <juxta> I heard that some people have used a single pin and PWM - have you tried that?
[20:58] <DanielRichman> sounds like a bad idea
[20:58] <Randomskk> could be a bit noisy
[20:58] <Randomskk> ideally a DAC would be nice, some micros have them builtin
[20:58] <DanielRichman> you'd need some sort of filter to make it into a nice analogue signal rather than some pwm mess
[20:58] <DanielRichman> yes
[20:59] <DanielRichman> PWM isn't very nice DAC
[20:59] <Randomskk> though if it was at a much higher frequency than the sample rate it should be okay
[20:59] <DanielRichman> you could do it with 1 pin and about five resistors
[20:59] <Randomskk> since most ADCs use a capacitor in a sample-and-hold kinda method, the pwm would charge their input cap
[20:59] <Randomskk> DanielRichman: wouldn't you need a pin per output voltage level?
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[21:00] <DanielRichman> Randomskk, nah. Since a pin can be shorted-0v, shorted-5v or high-impedence (input mode), you can abuse that to make some crazy voltage dividers
[21:00] <DanielRichman> you have a voltage divider and then the pin connected through a resistor to the middle
[21:01] <Randomskk> oh true.
[21:01] <Randomskk> that's pretty neat.
[21:01] <DanielRichman> when shorted high, the resistance of that resistor and the high-part of the other dividor behave like resistors in paralell, insert maths here, get nasty values
[21:01] <jcoxon> 2pins + resistors is probably simplest ;-)
[21:01] <DanielRichman> I did the calculations once... if you want nice e12 values you need about 5 resistors, although if you could construct any resistors you want you'd need three
[21:01] <Randomskk> but not as cool as one pin in three states :P
[21:01] <DanielRichman> you only need two of the three states :P
[21:02] <juxta> starting to run short on pins now though
[21:02] <jcoxon> am searching for any temperature data
[21:02] <Randomskk> DanielRichman: what, 5v or high-z?
[21:02] <jcoxon> anyone got any?
[21:02] <juxta> not yet ;p
[21:02] <DanielRichman> Randomskk, you can pick any two of the three and get it to work
[21:02] <Randomskk> why not just +5 and 0 then? :P
[21:03] <DanielRichman> http://www.richmanwebsite.co.uk/gpiotheory.pdf
[21:05] <juxta> Randomskk: input to the NTX2 should be between 0-3.3v
[21:05] <Randomskk> so as per example 2 you don't actually need to use the pin as high-z?
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[21:15] <jcoxon> bbl
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[21:55] <jcoxon> oooooo weds/thurs looks like good days for launching
[21:55] <jcoxon> rjharrison, ping
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[00:00] --- Mon Nov 2 2009