highaltitude.log.20090824

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[00:58] <SpeedEvil> http://img.4chan.org/b/src/1251069313096.jpg Pure genius. (worksafe)
[01:00] <gordonjcp> excellent
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[14:48] <rjharrison> I guess the internet connection in Ghana is crap then
[14:58] <SpeedEvil> Or he's found a nice lady to distract him.
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[15:21] <rjharrison> SpeedEvil well 1) Helen won't be too pleased. and 2) I hope he bags up cose the HIV rate is quite high out there :)
[15:23] <SpeedEvil> oops - diddn't know he was involved.
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[17:07] <rjharrison> ping DanielRichman
[17:08] <DanielRichman> pong rjharrison
[17:08] <rjharrison> Are you using the NTX2 module
[17:08] <DanielRichman> yup
[17:08] <rjharrison> From radiometrix
[17:08] <DanielRichman> indeed
[17:09] <rjharrison> I'm using 2 pin rtty atm and I'm thinking about moving to 1 pin
[17:09] <DanielRichman> oooh.
[17:09] <rjharrison> Now I would like the rtty either side of the 434.075 Mz
[17:10] <rjharrison> and I'm thinking I can do this my setting the ground to say 1.5v from the battery ground
[17:10] <rjharrison> then I can ocilate the voltage +- either side of ground
[17:10] <rjharrison> oscilate
[17:10] <DanielRichman> interesting
[17:10] <rjharrison> Does that make sense to you
[17:11] <DanielRichman> which ground are you setting to 1.5
[17:11] <rjharrison> GND not RFGND
[17:11] <DanielRichman> avr ground or ntx2 ground?
[17:11] <rjharrison> ntx2 ground
[17:11] <DanielRichman> ahh, interesting
[17:11] <DanielRichman> but I thought it was centered around 1.2V above ground?
[17:12] <DanielRichman> You should be able to do one pin rtty with three resistors, I reckon
[17:12] <DanielRichman> and a bit of math
[17:12] <rjharrison> ie 1v would be higher than 434.075 and 2v would be lower
[17:12] <rjharrison> Yep I can
[17:13] <rjharrison> Just have some think like a tripple divider. With no pin output 1v and with pin output 2v
[17:13] <rjharrison> eg
[17:15] <DanielRichman> could have 5V --[RB]---+--[RC]--- 0V
[17:15] <DanielRichman> |
[17:15] <DanielRichman> pin --[RA]--+
[17:15] <DanielRichman> |
[17:15] <DanielRichman> TXD
[17:15] <DanielRichman> and by getting the values right... the pin could go INPUT/high impedence or pull it low or pull it high (two of the three states) and get that to output the required voltages
[17:15] <DanielRichman> without moving the ground
[17:16] <DanielRichman> besides. I think RFGND is internally connected to GND in the NTX2?
[17:17] <rjharrison> DanielRichman I think your memory serves you well. iirc you are right they are connected
[17:18] <DanielRichman> you may end up with a 1.5v short circuit ;)
[17:21] <rjharrison> Yep thanks for that
[17:21] <rjharrison> worth chatting it over
[17:21] <DanielRichman> just thinking about the tripple dividor
[17:22] <rjharrison> I think without PIN high V should be low
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[17:22] <rjharrison> and when pin high V should be High
[17:22] Action: DanielRichman fetches pen and paper
[17:23] <rjharrison> I'm on 3.3v
[17:23] <rjharrison> ! 5v
[17:23] <DanielRichman> I'll leave the input voltage in the equation
[17:23] <DanielRichman> until the last moment
[17:23] <rjharrison> ! = not
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[17:24] <rjharrison> DanielRichman nice ascii art BTW
[17:25] <rjharrison> .
[17:25] <DanielRichman> rjharrison, i cheat. I concocted that in VIM before pasting into xchat ;)
[17:25] <rjharrison> :)
[17:26] <rjharrison> Is it bad to send a small voltage to an output pin
[17:26] <rjharrison> I'm guessing not
[17:26] <DanielRichman> when it's an input, i don't think so
[17:26] <DanielRichman> output pin... it's just internally shorted low right? so worst can happen is that a small current will be pulled through
[17:26] <DanielRichman> or high
[17:27] <rjharrison> I'll run a small test
[17:27] <rjharrison> It would be better to have a pin freed up
[17:28] <DanielRichman> also means you can make an rtty'er with an attiny
[17:28] <rjharrison> hehe true
[17:28] <rjharrison> I think Icarus 4 may have 2 avrs on board
[17:28] <DanielRichman> dual coar?
[17:28] <DanielRichman> why do you need two?
[17:29] <rjharrison> Well I'm working on that...
[17:29] <DanielRichman> :P
[17:30] <DanielRichman> I'm just thinking about the tri-resistor idea. It's possible to switch between having the GPIO as an INPUT, ie. not affecting the circuit at all, and HIGH OUTPUT, shorted to Vcc... but I think it would actually be easier to either have it change between HIGH OUTPUT and LOW OUTPUT or LOW OUTPUT and INPUT, since the latter two options only require one bit change per rtty-change
[17:30] <DanielRichman> if that makes sense
[17:31] <rjharrison> Yep it does
[17:31] <rjharrison> I like the idea of HIGH LOW OUTPUT
[17:31] <DanielRichman> I think the best option is LOW OUTPUT and INPUT because then at POWER ON it's already sending a space
[17:31] <DanielRichman> although it should be a mark
[17:32] <DanielRichman> could have LOW OUTPUT = mark; then at poweron it's ready.
[17:32] <rjharrison> Not sure how that works. My elec ignorance here but if I set the pin to input from put put how will that effect the circuit
[17:33] <rjharrison> put put = low output
[17:33] <DanielRichman> As I understand it, an input pin has high impedence and it's as if there is no connection
[17:33] <DanielRichman> although that will have to withstand some testing
[17:34] <rjharrison> Where I can understand output high low working
[17:36] <rjharrison> Will do some testing tonight on this
[17:36] <rjharrison> Icarus III is getting there
[17:37] <rjharrison> http://www.robertharrison.org/svn/filedetails.php?repname=the-icarus-project&path=%2FIcarus+III%2Feagle%2FIcarus+III%2FIcarus.sch
[17:37] <DanielRichman> ooh, liking the http svn
[17:38] <rjharrison> If you want some space on there let me know
[17:39] <rjharrison> I can set you up a repo if you like
[17:40] <DanielRichman> it's ok, we're using the googlecode svn at the moment - works ok
[17:40] <rjharrison> Oh yep true that is great too
[17:41] <DanielRichman> ok these equations just got annoying
[17:44] <rjharrison> bbiab
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[22:06] <rjharrison_home> Hey edmoore
[22:06] <edmoore> hi
[22:14] <DanielRichman> ping rjharrison_home
[22:14] <rjharrison_home> hey DanielRichman
[22:15] <DanielRichman> I tried the tri-resistor rtty; plugging in 0.9V and 1.2V - then I built it, with 3 resistors (not really close enough to the real values) i got 0.91V and 1.15V out
[22:16] <DanielRichman> So it sort of works - could get closer with some pots.
[22:16] <DanielRichman> the math sort of consisted of a very long yet simple/basic equation and abuse of wolfram alpha
[22:18] <rjharrison_home> hehe
[22:18] <rjharrison_home> Cool
[22:19] <DanielRichman> http://www.richmanwebsite.co.uk/gpiotheory.pdf
[22:19] <rjharrison_home> I'll have to have a go at the
[22:20] <rjharrison_home> DanielRichman nice pdf
[22:20] <rjharrison_home> I'll print that out and read it
[22:21] <rjharrison_home> Just playing with eagle atm
[22:23] <DanielRichman> cool. I also tested the INPUT/Impedence thing
[22:23] <DanielRichman> it does seem that if you put a pin as INPUT it behaves as if there is no connection/the pin was made from plastic
[22:24] <rjharrison_home> I like the analogy
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[00:00] --- Tue Aug 25 2009