highaltitude.log.20090831

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[06:46] <rjharrison_home> Morning all
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[14:16] <rjharrison_home> afternnon all
[14:16] <rjharrison_home> not much conversation in here today
[14:16] <SpeedEvil> afternoon
[14:17] <rjharrison_home> Hi SpeedEvil just going to put the finishing touches to the schematic and going to start on the board
[14:29] <SpeedEvil> :)
[14:46] <rjharrison_home> hey sbasuita how is your payload getting on?
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[15:13] <rjharrison_home> Yo edmoore
[15:14] <edmoore> hi rjharrison_home
[15:14] <edmoore> what news?
[15:14] <rjharrison_home> You back in Camb?
[15:14] <edmoore> yep
[15:14] <rjharrison_home> Not much just finishing off the schematic for icarus III
[15:18] <rjharrison_home> edmoore this is where I'm up too http://www.robertharrison.org/svn/filedetails.php?repname=the-icarus-project&path=%2FIcarus+III%2Feagle%2FIcarus+III%2FIcarus.pdf
[15:19] <rjharrison_home> Getting quite busy in there. Obv not in the CUSF scal yet
[15:19] <rjharrison_home> scale
[15:19] <edmoore> ok cool
[15:20] <edmoore> looks neat, though don't have enough time to actually check - there's enough awkward stuff on badger-2 to be done yet!
[15:20] <rjharrison_home> edmoore no worry not complete yet
[15:20] <rjharrison_home> Will finalise before asking for a quick check off
[15:21] <rjharrison_home> Also I plan to prototype it all befor sending off
[15:22] <rjharrison_home> one quick question for cutdown I need (like) 4700uf can I just put 2 Caps 2300uf in parallel // ?
[15:22] <rjharrison_home> given that C1 + C2 = Ct
[15:22] <rjharrison_home> SpeedEvil Feel free to comment on that last
[15:25] <SpeedEvil> yes
[15:26] <SpeedEvil> JP1 - you know about diode voltage drops - don't quite get what that jumper is for
[15:29] <SpeedEvil> temp1 and temp2 are 1-wire?
[15:37] <rjharrison_home> SpeedEvil T1 and T2 are 1-wire :)
[15:37] <rjharrison_home> They are dummy diodes to prevent problems by accidental connection around the wrong way
[15:38] <rjharrison_home> They are for me when I accidently push the pp3 conector on to the battery pack the wrong way
[15:38] <rjharrison_home> :)
[15:38] <SpeedEvil> Oh - right - JP1 isn't 3.3V input - it's input to the 3.3V regulator
[15:38] <rjharrison_home> Yep :)
[15:39] <SpeedEvil> shottky diodes I assume?
[15:39] <rjharrison_home> No should they be
[15:39] <SpeedEvil> Oversize them somewhat for lowest volt drop
[15:39] <rjharrison_home> I don't know my diodes from my elbow :)
[15:40] <rjharrison_home> shottky ones then
[15:40] <SpeedEvil> shottky diodes have maybe 0.5V drop at their nominal current - not 1V like normal ones
[15:40] <rjharrison_home> Ok I'll order some of those up
[15:40] <SpeedEvil> Oversize them a bit - 10* more current - and you get 0.4V or so
[15:40] <rjharrison_home> like .5 amp
[15:40] <SpeedEvil> Only caveat is they are lower Vbr - but that doesn't matter in this app
[15:41] <rjharrison_home> I can't see me drawing anything like that
[15:41] <SpeedEvil> ?
[15:44] <rjharrison_home> .5 amps
[15:45] <rjharrison_home> http://uk.farnell.com/fairchild-semiconductor/mbr0520l/diode-schottky-0-5a-20v-smd/dp/1467521
[15:45] <rjharrison_home> Something like that SpeedEvil
[15:46] <rjharrison_home> ?
[15:53] <SpeedEvil> Something like.
[15:53] Action: SpeedEvil is moving rock - so may be AFK
[15:53] <SpeedEvil> Your current is what?
[15:54] <SpeedEvil> Looks like about 0.35V@50mA@-55C
[15:59] <Matt_APEX> just out of interest, what is the 0 TO 3.92 kPA pressure sensor used for? (mpxv5004)
[16:01] <SpeedEvil> sensing 0 to 3.92kPa
[16:01] <SpeedEvil> The differential sensor?
[16:01] <SpeedEvil> It's for ballooon pressure
[16:01] <Matt_APEX> yea but the maximum range is low
[16:01] <Matt_APEX> oh i see
[16:02] <Matt_APEX> i thought u were having a sensitive atmospheric sensor
[16:02] <SpeedEvil> Measuring the balloon differential pressure lets you work out how to properly do floaters.
[16:03] <Matt_APEX> yea
[16:03] <Matt_APEX> and do u realise the other one only gives out 0-40mV over its range?
[16:03] <SpeedEvil> Also - 0-3.92kPa would come into range at about 22km?
[16:03] <Matt_APEX> yea but the max pressure is 16kpa
[16:03] <SpeedEvil> If it actually was anabsolute sensor
[16:04] <SpeedEvil> Not looked at the sensors in detail
[16:04] <Matt_APEX> yea, i was thinking a 40mV output directly into an ADC wouldnt work too well
[16:05] <Matt_APEX> and as the output is probably directly off the pressure transducer, the ADC may affect the reading without being buffered?
[16:07] <SpeedEvil> Not IIRC - I recall the output as being quite low impedence. It may need an opamp in there
[16:07] <SpeedEvil> (to boost the volts)
[16:08] <Matt_APEX> yea that would make more sense :)
[16:10] <Matt_APEX> seems like a bit of a pain if it needs 10V, and that seems to be the only thing that needs 10V...
[16:22] <SpeedEvil> The number of sensors that go to 0 as absolute is very small
[16:24] <Matt_APEX> yea i was looking before too
[16:24] <Matt_APEX> only found a 0-200kpa integrated one
[16:28] <SpeedEvil> Vacuum pump and epoxy might almost be a 'solution'
[16:33] <Matt_APEX> or get a dual ported one, epoxy one port, and measure the pressure relative to 100kpa
[16:33] <Matt_APEX> no need for a good vacuum pump
[16:34] <Bertrix> anyone know an eagle library with ethernet transformer schematic symbol
[16:34] <Bertrix> ?
[16:36] <Matt_APEX> maybe one here.. http://www.cadsoft.de/cgi-bin/download.pl?page=/home/cadsoft/html_public/download.htm.en&dir=eagle/userfiles/libraries
[16:40] <Bertrix> found a neat solution. select DIL16 generic symbol
[16:40] <Bertrix> copy it. rename to FB2022 Pulse transformer and done
[17:31] <edmoore> rjharrison_home: ping for you
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[20:22] <akawaka> whats the simplest microcontroller i can talk to with USB?
[20:23] <akawaka> don't some of the attiny's have software USB?
[20:23] <natrium42> yeah, i am using an attiuny45 that way
[20:23] <natrium42> *attiny45 even
[20:28] <akawaka> natrium42: tinyusb library?
[20:28] <natrium42> v-usb
[20:29] <natrium42> my device --> http://www.electrobee.com/stepper-motor-controller-p-52.html
[20:30] <akawaka> thanks
[20:31] <akawaka> i can't remember if i have a avr programmer or not
[20:32] <natrium42> it uses ISP, so it's not too hard to make if you still have a LPT port :)
[20:41] <akawaka> i need a few more pins i think
[20:41] <akawaka> is there a 10-pin attiny?
[20:43] <natrium42> there might be
[20:43] <natrium42> the 25/45/85 are nice since they have built in PLL
[20:43] <natrium42> so you don't need any external crystals for v-usb
[20:44] <akawaka> true
[20:44] <natrium42> few of the avrs do
[20:44] <akawaka> i just need to control 6 leds
[20:45] <akawaka> i can do that with 4-pins
[20:46] <rjharrison_home> pong edmoore
[20:47] <akawaka> nice thing about the avrs over pics is they don't seem to put a lot of restrictions on the general I/O pins
[20:55] <edmoore> rjharrison_home: check email
[20:55] <rjharrison_home> Yep looking for my order
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[21:04] <edmoore_> rjharrison_home: thanks
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[00:00] --- Tue Sep 1 2009