highaltitude.log.20150215

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[03:19] <SpacenearUS> New vehicle on the map: 03pb73538_chase - 12http://tracker.habhub.org/#!qm=All&q=pb73538_chase
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[08:28] <jededu_> upu it did
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[08:43] <Upu> hey jededu_
[08:44] <Upu> they said it didn't have one on it
[08:44] <jededu_> It was a pi cam they probably diddnt recognise it
[08:45] <Upu> ah ok
[08:45] <Upu> awesome get some good pics ?
[08:45] <Upu> and what did it look like after being in a tree for 6 months ?
[08:45] <jededu_> I sent him a pic have a great shot of the farm
[08:45] <Upu> link ?
[08:45] <DL1SGP> good morning folks
[08:45] <Upu> morning DL1SGP
[08:46] <mclane_> hello everybody
[08:46] <DL1SGP> Guten Morgen mclane_
[08:46] <jededu_> hang
[08:46] <Upu> I'd like to pass a few pics back to Radiometrix if thats ok
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[08:51] <jededu_> Yes do as you wish they are only up to 16k i think
[08:52] <jededu_> imgur taking its time
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[08:52] <jededu_> The farm http://imgur.com/LfRd6K4
[08:53] <jededu_> Landing Site http://imgur.com/TCLazhp
[08:55] <jededu_> and lts of fluffy clouds
[08:55] <jededu_> lots
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[08:56] <SpacenearUS> New position from 03ATSAT-4 after 038 hours silence - 12http://tracker.habhub.org/#!qm=All&q=ATSAT-4
[08:58] <Upu> nice jededu_ didn't realise it had a camera thats awesome
[08:58] <jededu_> He appreciated the pics
[08:58] <Upu> yup :)
[08:58] <Upu> I didn't realise you'd launched a Pi
[09:00] <jededu_> Stripped down on a pawan100 it was a cutdown test
[09:01] <jededu_> Thats as high as it got http://imgur.com/6koatKV
[09:02] <Upu> 15km not bad at all
[09:02] <Upu> and it booted straight back up ?
[09:06] <mclane_> what was the payload weight?
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[09:08] <jededu_> Yep put a batt on it and it started txinx :)
[09:09] <jededu_> About 70g I think
[09:10] <mclane_> that's lightweight!
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[09:22] <jededu_> The stripped pi weighs 23g
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[09:43] <SpacenearUS> New vehicle on the map: 03CALLSIGN123_chase - 12http://tracker.habhub.org/#!qm=All&q=CALLSIGN123_chase
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[10:05] <Vaizki> what did you strip out?
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[10:10] <jededu_> All the sockets and the reg + cap
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[10:15] <jededu_> I got the idea from daveake http://www.recantha.co.uk/blog/?p=3110
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[10:29] <daveake> ha :)
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[10:39] <es5nhc> Hey x-f, you were in Tallinn yesterday?
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[10:49] <Mark_B> Hi, good morning
[10:52] <Mark_B> Could anyone confirm whether the habitat burst calculator result for neck lift includes the payload weight?
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[10:53] <daveake> It's the lift at the neck. It will be larger than your payload weight otherwise the payload isn't going anywhere!
[10:53] <Mark_B> Hi Dave.
[10:53] <daveake> So the net lift is neck lift minus payload weight
[10:54] <Mark_B> OK. Got that. But, is the figure in addition to the payload? Or, do you subtract the payload weight and measure the difference? ta
[10:55] <Mark_B> I sould have looked at the screen before pressing rtn :)
[10:55] <Mark_B> Thanks Dave
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[11:02] <Mark_B> Does anyone know whether the Dutch guys managed to get the payload back from their recent flight 8 Feb?
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[11:30] <Babs_> in the n-channel mosfet saga, this is my latest method (already bought the n-channel one, so wanted to keep it on the -ve side of the gps rather than use a p-channel one)
[11:30] <Babs_> https://www.flickr.com/photos/91049302@N00/16536495795/
[11:30] <Babs_> does anyone know whether this is the correct setup?
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[11:31] <SpeedEvil> The'top' ground is connected to the GPS?
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[11:32] <SpeedEvil> Oh - right
[11:32] <Babs_> the way i read the gps, in this setup gnd might be called -ve
[11:32] <Babs_> as only the mosfet connects directly to gnd
[11:33] <SpeedEvil> The problem doing that - you need to pull RX and TX high when you power off, or things will go wrong
[11:34] <Babs_> because they are just floating otherwise?
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[11:37] <Vaizki> I have no idea how that circuit could work
[11:39] <paul_HAB-P> Sorry to ask a noob question but what is the socket called typically found on things like DVB amps like: http://www.amazon.co.uk/gp/product/B00R2ZHC2U?psc=1&redirect=true&ref_=oh_aui_detailpage_o04_s00
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[11:40] <Babs_> my resistor r8 is mislabelled. it should be 100 ohm
[11:40] <paul_HAB-P> Sorry it's an F conenctor. got it taa
[11:40] <db_g6gzh> paul_HAB-P: those are F connectors
[11:41] <paul_HAB-P> tyanks db_g6gzh!
[11:41] <paul_HAB-P> gotta buy yet more adapters lol
[11:42] <Vaizki> Babs_: your mosfet has GND on both source and drain?
[11:43] <Vaizki> what are you using a DVB amp for?
[11:45] <Babs_> to switch power on and off to the gps
[11:51] <Vaizki> ok now I might see it.. so you are basically turning it off by disconnecting ground from the GPS?
[11:52] <Vaizki> that seems like a very convoluted way to go about it
[11:55] <Babs_> yes exactly
[11:55] <Babs_> upu showed me a way to do it power side
[11:55] <Babs_> but that needs a p-channel mosfet
[11:56] <Babs_> and i reckon there should be a way to do using the n-channel one i already have
[11:56] <Babs_> the easiest way is just to buy a couple more p-channel ones as they are cheap
[11:56] <Babs_> but i figure the best way to understand the component is to use the one i have an adapt it
[11:58] <Vaizki> well playing with the GND level of components like that can lead to a lot of weirdness, magic I am not comfortable with
[11:58] <Vaizki> it's a big can of worms I don't recommend opening at this point
[11:58] <Vaizki> if it says ground, just tie it to ground. don't mess with it.
[11:59] <Vaizki> keep it simple
[11:59] <Babs_> understood - thanks vaizki
[12:00] <paul_HAB-P> Vaizki, I've script up some very wideband RF surveys from a BBB for fun
[12:00] <edmoore> yoyo - yes i'd switch on the high side for that
[12:00] <paul_HAB-P> so I want the DVB amp on the front of the rubbish dipole I'm using.
[12:01] <edmoore> otherwise current will find a way back to ground through rf_gnd or whatever anyway
[12:02] <paul_HAB-P> doing 3min * 100Hz resolution across 100Mhz - damn my NAS will be full.
[12:02] <paul_HAB-P> using rtl_power
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[12:07] <Babs_> yo edmoore - we are doing 101 electronics here
[12:07] <paul_HAB-P> My neighbour has a big dipole outside and has offered to drop a split feed across to me. Sometimes, they use burners. Is there a cost effective way to safely split the feed and not have my kit blown up everytine he hits tx?
[12:07] Nick change: day- -> day
[12:08] <edmoore> yo Babs
[12:11] <paul_HAB-P> Ok so it would appear that a TX/RX switch + splitter is the way to go?
[12:12] <SpeedEvil> paul_HAB-P: unless yo both hit TX at the same time
[12:12] <paul_HAB-P> Good point SpeedEvil - but I am a listener only right now so no issue :)
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[12:46] <Geoff-G8DHE-M> Is your GPS aerial likely to have any other earths about it if so then the FET will be shorted out
[12:47] <Geoff-G8DHE-M> oops sry discussion has continued on since I saw the image!
[12:51] <mattltm> Well done :)
[12:52] <mattltm> Opps. I should check which window is active before I hit enter!
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[13:50] <infaddict> morning guys. need some help with ublox m8 and configuring flight mode. I can successfully send ubx commands to the gps and it acknowledges them with an ack packet which is great!
[13:50] <infaddict> This works fine for disabling various NMEA messages, all of which are acknowledged by the ublox
[13:50] <infaddict> however, no matter what I try, when I try a flight mode command, I don't receive any ack packet (or nack packet) at all
[13:51] <infaddict> I've tried using several variants of the hex message for flight mode including those from daveake, laurence, google sources and even from the ublox windows software
[13:51] <infaddict> none of them are acknowledged by the GPS ;-(
[13:51] <Upu> hardware or software serial ?
[13:52] <infaddict> i2c
[13:52] <Upu> oh should be ok
[13:52] <infaddict> yer its weird because the disable GLL type of messages are ack'd perfectly
[13:52] <infaddict> with checksum
[13:52] <Upu> speak to daveake see if he has any ideas
[13:53] <infaddict> i did notice laurenceb's code had different versions of the command depending on gps firmware version
[13:53] <infaddict> wondering if ublox have changed something
[13:53] <infaddict> ideally i need to find out what firmware my unit is
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[13:55] <infaddict> What is weird is the gps isnt even sending a NACK. its just merrily carrying on spewing out NMEA data. as if it didnt see or recognise the flight mode command at all.
[13:56] <Upu> turn NMEA off
[13:56] <Upu> try it then
[13:57] <infaddict> yer i can try that (once i figure out the command to do that). strange how other commands work fine tho.
[14:07] <infaddict> sadly that didnt work either. still no ack of the NAV5 message (which is the flight mode).
[14:07] <infaddict> so dont think its NMEA related
[14:08] <infaddict> interested to hear from anybody who has got an ACK working back from the NAV5 command
[14:11] <Vaizki> hmm.. maybe ill try that later today
[14:12] <Upu> infaddict disable all other NMEA stuff
[14:12] <Upu> set it
[14:12] <Upu> turn them back on
[14:12] <infaddict> sure i can try that
[14:13] Nick change: Odd^Satomi -> Oddstr13
[14:14] <infaddict> this may be one reason why daveake was setting flight mode every minute rather than looking for an ack. or maybe not, but a thought i had.
[14:14] <infaddict> but worries me the gps might not actually be entering flight mode at all
[14:16] <Upu> you need to check its in flight mode
[14:16] <infaddict> indeed
[14:16] <Vaizki> i think it reports the mode back in a sentence
[14:16] <infaddict> yep you can send a message with no payload and it should return current settings... havent tried that yet
[14:25] <jededu> I have it working but its in BASIC
[14:25] <jededu> With M8Q
[14:27] <infaddict> hey jededu, anything i can take a look at might give me some ideas. running out rapidly ;-)
[14:29] <Upu> turn the bloody messages off :)
[14:31] <infaddict> hey Upu just done that and no cigar. Turned off GSA, GLL, RMC, VTG, GGA, GSV and ZDA (all with successful ack's). then issued airborne command and still not ack
[14:32] <infaddict> ive even taken the exact hex message code from the ublox windows application to ensure the message is correctly structured
[14:32] <infaddict> (as i have for other messages which are working)
[14:32] <infaddict> this is really weird
[14:32] <Upu> https://github.com/Upuaut/pAVAR9/blob/master/pava9_rtty/pava9_rtty.ino
[14:33] <Upu> have alook in there
[14:33] <Upu> afk a few
[14:35] Nick change: Oddstr13 -> Odd^Satomi
[14:36] Nick change: Odd^Satomi -> Oddstr13
[14:37] <jededu> Not really I just search for matching bytes in the response
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[14:38] <jededu> If CfgRsp(3)=&H01 AND CfgRsp(8)=&H32 AND CfgRsp(9)=&H5B then
[14:39] <jededu> Nothing like your code
[14:40] <infaddict> yep i am writing out the entire byte stream coming back from gps and i see nothing related to ack/nack at all after the NAV5 message is sent. but i see ack everytime for other messages...
[14:40] <infaddict> head hurts now so leaving it for lunch ;-)
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[14:46] <infaddict> also what is strange as the ublox appears to be remembering settings, despite a power off.
[14:49] <infaddict> forget that last comment, incorrect
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[15:14] <infaddict> thx for that code UPU. all the examples i've seen are serial and wonder if using i2c is playing a factor. it shouldnt. likely something else is wrong in my code. will work on it later today some more.
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[15:22] <SpacenearUS> New position from 03ATSAT-3 after 039 hours silence - 12http://tracker.habhub.org/#!qm=All&q=ATSAT-3
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[15:49] <darthsimon123> hi all, has anybody of you any recommendations for a Linux command line SSTV decoding software? Been looking for the like but didn't find anything...
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[16:47] <Babs_> infaddict - reading back i may have a potential solution to your problem
[16:47] <Babs_> are you pinging the gps with a ubx command?
[16:47] <Babs_> to get the data etc.
[16:52] <infaddict> hey Babs, sry only just saw this. Yes I am firing UBX to the ublox via I2C
[16:53] <Babs_> so i don't use i2c, but one of the things that really confused me was
[16:54] <Babs_> i had the code working on a max7 really nicely, was pinging it for the nav-pvt output, check digits worked ok etc.
[16:54] <Babs_> then somewhere along the line changed to max8, and couldn't get the check digits working pinging it for the same nav-pvt output
[16:55] <Babs_> turns out that between the two chips they had changed the nav-pvt output so it was longer and contained more info for the max 8 than with the max 7
[16:56] <Babs_> so the check digits i was analysing wasn't a check digit any more, it was just part of the string which i hadn't fully read
[16:56] <Babs_> so check you aren't using out of date code with a more in date chip
[16:56] <Babs_> there is a user manual on the ublox site which will give you expected lengths of strings etc.
[16:56] <infaddict> ok interesting thx. however i am not getting ANY part of the ack packet at all. Not even the B5 starting char. Yep I've got that mammoth 200 page PDF for all commands and I'm using the
[16:57] <infaddict> u-center software to validate my messages too
[16:57] <Babs_> depending on the controller you are using and software, there is a last issue
[16:57] <Babs_> which is that the serial buffer is 64 bytes long, and the string that comes across may be larger than that
[16:57] <Babs_> so you need to change the length of the serial buffer to a larger number to accomodate it
[16:57] <Babs_> that was October 2014 to November 2014 for me....
[16:58] <infaddict> aha. on i2c i'm grabbing 80 bytes at a time. i can try playing with that number.
[16:59] <Babs_> if you are using the arduino interface, it stops at 64 bytes
[17:00] <infaddict> the i2c bugger is 64 bytes?
[17:00] <infaddict> ha
[17:00] <infaddict> *buffer
[17:01] <Babs_> don't know what the i2c accesses, but the serial buffer is 64 bytes
[17:01] <infaddict> right
[17:01] <Babs_> http://www.hobbytronics.co.uk/arduino-serial-buffer-size
[17:02] <Babs_> i did a different version of this to get 128 bytes and it works fine for polling nav-pvt, which contains all the info you need
[17:02] <mattbrejza> how much ram do you actually have left after all the built in libraries have taken their share?
[17:02] <daveake> There is no i2c buffer in the Arduino library
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[17:02] <daveake> You request a byte at a time
[17:03] <daveake> and the lib requests the byte from the slave
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[17:04] <Babs_> yes, i don't do mine through i2c so your issue may be different
[17:04] <infaddict> hey dave
[17:04] <infaddict> im having a right pain with setting flight mode via i2c
[17:04] <infaddict> all my other ubx messages work fine (such as disable NMEA) and i get a ACK packet back and validate it
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[17:04] <infaddict> but the NAV5 flight mode message doesnt seem to force a ACK or a NACK from the ublox at all
[17:05] <infaddict> i've tried many variants of the message
[17:05] <daveake> Well have a look in the ublox manual
[17:05] <daveake> There'll be a command to ask for the mode
[17:05] <infaddict> yep there is. just coding up a pgm to do that now actually.
[17:05] <infaddict> you can call any ubx command with empty payload and it should return the current settings
[17:06] <infaddict> but v strange its not ack'ing. as if it just doesnt get the command.
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[17:23] <infaddict> hum cant get that working either. gotta go out now but will revisit later.
[17:24] <infaddict> dave it would be interesting to see in your code that you shared with me, what bytes are being returned after you set the flight mode (i.e. are you getting an ACK)
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[17:54] <tweetBot1> @daveake: Mammoth new blog post - everything you always wanted to know about latex (ballooning) but were afraid to ask #UKHAS http://t.co/fuu0GzaG6W
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[18:29] <happeo> Hello
[18:30] <happeo> I was wondering if anybody here would be able to help advise me about the CAA balloon application form?
[18:32] <happeo> In particular, I am not sure about 'Contact telephone number at site', 'height of top of balloon above ground level when flown', the operator and dimensions.
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[18:37] <daveake> wrong form
[18:38] <daveake> Get the form from http://ukhas.org.uk/general:restrictions_legality
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[18:44] <x-f> es5nhc, yes, i was in Tallinn
[18:50] <happeo> ok...
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[18:52] <happeo> you sure that's the right form? It's a word doc.
[18:53] <daveake> Yes I am sure
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[18:54] <happeo> This one (captive unmanned gas balloon) appears to be the right one: http://www.caa.co.uk/application.aspx?catid=33&pagetype=65&appid=11&mode=detail&id=4409
[18:54] <daveake> You doing a captive "flight" ?
[18:55] <happeo> Captive where the balloon is tethered?
[18:55] <daveake> yes that's what captive means
[18:55] <happeo> o
[18:55] <happeo> the form you linked isn't on the caa site
[18:55] <daveake> Are you doing a captive flight?
[18:56] <happeo> no.
[18:56] <daveake> Then you don't want the captive flight form, do you?
[18:56] <daveake> The doc I linked to is the correct one
[18:56] <happeo> nein. but I can't find your form anywhere on the caa website, and it's not hosted there either.
[18:56] <daveake> It is the correct one.
[18:57] <happeo> alright.
[18:57] <happeo> maximum dimension of balloon - on ground or at max altitude?
[18:57] <daveake> I put "1.5 metres at launch"
[18:57] <happeo> radar reflector attached... no, is that necessary.
[18:58] <daveake> not needed
[18:58] <daveake> in fact they recommend not to use one
[18:58] <happeo> ok.
[18:58] <happeo> so I just find an OS map online, print it, circle the launch site then put in with the form
[18:58] <daveake> yup
[18:59] <daveake> bing maps have OS
[18:59] <happeo> ah.. bing maps.
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[18:59] <happeo> so much better than google rubbish
[19:00] <happeo> birds eye view is the best
[19:01] <lz1dev> daveake> in fact they recommend not to use one
[19:01] <lz1dev> whats the reasoning behind that?
[19:01] <daveake> something else to hit
[19:02] <es5nhc> x-f, cool. I was the one who asked the question on meteorological point of view
[19:03] <x-f> hah, i figured that (later) :)
[19:03] <x-f> but, yeah, our meteo office isn't very open
[19:06] <Babs_> evening all - who are the main guys on here who program nearspace.us
[19:07] <adamgreig> ah yes, nearspace.us
[19:07] <adamgreig> our main competitor
[19:07] <adamgreig> we mostly run spacenear.us ;)
[19:07] <adamgreig> though it kind of depends on what you mean by program it... there are a lot of moving parts
[19:07] <Babs_> arf - sorry adamgreig
[19:08] <adamgreig> mostly written by different people, with various documented and undocumented interfaces between them :P
[19:08] <Babs_> so my photograph the eclipse shadow thing
[19:08] <adamgreig> yep
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[19:09] <Babs_> my program now punts out given any lat/long/alt a bearing and angle to a target point (at the moment i have the top of the shard on it but ultimately it will be a path describing the centre of the eclipse shadow)
[19:09] <Babs_> at the moment spacenear.us plots lat/long
[19:10] <Babs_> how easy would it be to use another transmitted datapoint to generate a vector on screen
[19:10] <adamgreig> sounds like a question for lz1dev
[19:11] <Babs_> i don't expect anyone to do it, but sometimes i guess those things may be easy to do and it might be quite a neat thing to plot out
[19:11] <Babs_> ultimately i can get the stuff off the sd card once it lands and hand plot it, but..
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[19:11] <lz1dev> erm
[19:12] <lz1dev> im not sure what you are trying to do
[19:12] <infaddict> drawing a line between a position and a bearing isnt hard
[19:12] <infaddict> is that what you mean? like a current hearding line when you walk with a GPS?
[19:12] <infaddict> i mean in general it isnt difficult, not sure about spacenear implementation
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[19:13] <Babs_> yes exactly that
[19:13] <Babs_> it is not really necessary, just thought it might be neat to look at live
[19:14] <Babs_> i can get all the info i need off the sd card to check it is working correctly
[19:14] <Babs_> at the moment i am just biking around london collecting data points
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[19:15] <infaddict> so the maths and stuff to calculate and draw that line arent hard. not sure how to then show it on a webpage, as I'm not a web guy.
[19:15] <lz1dev> im still confused to what he is trying to do
[19:16] <infaddict> send 2 lat/long points (or 1 lat/long plus a bearing) and draw a line between the 2 points (or along the bearing)
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[19:19] <lz1dev> on google maps?
[19:19] <infaddict> think original q was for spacenear.us site
[19:21] <Babs_> the bearing is calculated within my tracker program, as then it drives two servos (actually brushless motors) to point a camera at a specific point on the ground whatever the position and altitude of the balloon
[19:22] <Babs_> https://www.flickr.com/photos/91049302@N00/16353122698/
[19:22] <Babs_> spacenear.us as it currently outputs on the top
[19:22] <Babs_> what i am essentially doing by hand on the bottom, but could potentially be output live
[19:22] <lz1dev> ok
[19:22] <infaddict> yep so I cant speak for spacenear.us (not sure who can) but in theory drawing such a line is simple once you have the bearing
[19:23] <infaddict> how would you know what length to draw the line?
[19:23] <infaddict> is the 2nd point (shard) known or tx'd?
[19:24] <Babs_> you never transmit the second point, the point is that I am trying to point to it and the plot checks the accuracy of the calc
[19:24] <Babs_> it punts out bearing in degrees, vertical tilt and length of bearing to point to a place in 3-D space
[19:25] <Babs_> vertical tilt = angle from vertical
[19:25] <infaddict> ok so how long should the line be when drawn?
[19:25] <infaddict> it would go on forever otherwise
[19:25] <infaddict> i.e. past the shard
[19:25] <Babs_> thats the length of the bearing
[19:25] <Babs_> ie a vector
[19:25] <Babs_> direction and length
[19:25] <infaddict> ah right sry
[19:25] <infaddict> great, then yes its more than possible to do that
[19:25] <Babs_> oops dinner time
[19:25] <Babs_> brb
[19:35] <lz1dev> you want to send length+bearing and have a line drawn between balloon position and a calculated from those point ?
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[20:02] <infaddict> lz1dev: yep thats what I think he was asking
[20:04] <Babs_> yes exactly lz1dev
[20:04] <Babs_> length in km, bearing in degs or rads
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[20:13] <pc1pcl> Length, and two angles? (one in a 'compass direction' and one in a direction 'up/down' (so shortening the length depending on how much down you look)?
[20:14] <Reb-SM0ULC> Babs_: your goal? :) http://www.rtl-sdr.com/recording-video-passing-aircraft-raspberry-pi-rtl-sdr/
[20:15] <Babs_> yes exactly, only in reverse. in that example, i would be the plane and the camera would be on there
[20:16] <Babs_> pointing at the point on he ground
[20:16] <Babs_> *the
[20:16] <lz1dev> Babs_: its trivial to draw a line like that
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[20:17] <Reb-SM0ULC> Babs_: aah.. if one just can read the words in right order... odh.. :)
[20:19] <infaddict> yep drawing the line is easy. integrating with spacenear.us is the hard part.
[20:20] <infaddict> the google maps API allows all sorts of lines to be plotted, routes to be drawn etc
[20:21] <infaddict> e.g. using polyline and addOverlay this is possible.
[20:26] <infaddict> but this coding has to be done by the guys who own the website you want to see the results on. You can write your own code for your own website but would then need the data feeding into it.
[20:27] <Babs_> let me get it launched and output the data, and then if its interesting for someone to do something fun with it it'll work itself out
[20:27] <Babs_> cheers guys
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[20:37] <SpacenearUS> New vehicle on the map: 03HYDEST001 - 12http://tracker.habhub.org/#!qm=All&q=HYDEST001
[20:37] <infaddict> really interesting project Babs, good luck!
[20:39] <Babs_> thanks infaddict - it is a couple of years in the making https://www.flickr.com/photos/91049302@N00/sets/72157636929911016/
[20:42] <infaddict> wow looks amazing and a lot of hard work
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[20:47] <Reb-SM0ULC> Babs_: aah, i've seen your project before, very cool work!
[20:52] <Vaizki> so how high do you intend to be babs.. when the shadow falls?
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[20:54] <lz1dev> Babs_: were you asking if that can be integrated on the tracker? it totally can
[20:55] <lz1dev> which eclipse are gonna take picutres of?
[20:55] <Vaizki> try to guess from the flickr set title? :)
[20:55] <lz1dev> oh
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[20:56] <lz1dev> so this one http://www.timeanddate.com/eclipse/solar/2017-august-21
[20:56] <Babs_> lz1dev - yes, if it could be integrated it might be fun
[20:57] <lz1dev> this is interesting
[20:57] <Babs_> so based on the camera and lens, i need to be at max height and about 80km away to photograph the entirety of the shadow
[20:57] <lz1dev> combined with a shadow of overlay
[20:57] <lz1dev> 80km ?
[20:58] <Babs_> the really fun thing happens if i can properly use this thing http://desirerc.co.uk/controllers/v3-board.html
[20:58] <lz1dev> i wonder how big the total ecplise spot is
[20:58] <Babs_> and make the whole thing stable
[20:59] <Babs_> then if I can track the shadow and take enough stills, they can be combined for a swift fly by of it
[20:59] <Babs_> but there are a few test flights to do before that
[21:00] <lz1dev> did you mean 80,000 feet?
[21:00] <theRealSIbot1> In real units: 80,000 ft = 24.4 km
[21:01] <Babs_> nope, 80km
[21:01] <Babs_> horizontal distance
[21:01] <Vaizki> there's a partial eclipse here in a month
[21:01] <lz1dev> oh, i thought you mean altitude
[21:01] <Babs_> 30k up, 80k away
[21:01] <lz1dev> do you know how big the total eclipse spot is ?
[21:02] <Vaizki> it's the size of the moon
[21:02] <Vaizki> ;)
[21:02] <Vaizki> ok well add some math on top but you get the idea...
[21:02] <lz1dev> diameter of the moon =
[21:02] <lz1dev> 3 474.8 kilometres
[21:03] <lz1dev> hmm looks smaller on that visualization
[21:04] <Babs_> not sure that is correct, otherwise the path of totality would cover much of the earth
[21:04] <Babs_> rather than the relatively smaller path traced
[21:04] <Babs_> but i need to check it out
[21:05] <Babs_> at the very least i should see a shadow ripping towards me at mach 1 or something
[21:05] <Vaizki> naah of course the path is not really the width of the moon
[21:06] <Vaizki> the sun is much bigger than the moon
[21:06] <lz1dev> i mean the shadow
[21:06] <lz1dev> or the area where it would be a total ecplise
[21:07] <Vaizki> ok well picture worth a thousand words, http://upload.wikimedia.org/wikipedia/commons/0/00/Geometry_of_a_Total_Solar_Eclipse.svg
[21:08] <Vaizki> obviously not to scale but there's the math on top
[21:12] <Babs_> https://s-media-cache-ak0.pinimg.com/236x/ef/07/0b/ef070b505ec8dd11f04ebf68b3ab9c1a.jpg
[21:13] <lz1dev> http://eclipse.gsfc.nasa.gov/SEplot/SEplot2001/SE2017Aug21T.GIF
[21:13] <lz1dev> there we go
[21:13] <infaddict> Babs what camera optics do you intend to use?
[21:14] <infaddict> do u need special lense or settings for pointing at eclipse?
[21:14] <lz1dev> path width 117km
[21:14] <lz1dev> should totally be visible from a hab
[21:15] <infaddict> sry just realised you are pointing camera to earth not sun ;-)
[21:15] <lz1dev> yeah
[21:15] <infaddict> great idea
[21:15] <lz1dev> http://eclipse.gsfc.nasa.gov/SEpath/SEpath2001/SE2017Aug21Tpath.html
[21:15] <lz1dev> and the math done for me
[21:15] <lz1dev> Babs_: think i just made your life easy
[21:15] <infaddict> 68 seconds long
[21:16] <Babs_> oooooo lz1dev
[21:16] <Babs_> tell me more
[21:16] <infaddict> that link has it all
[21:16] <infaddict> lat/long, size, timings
[21:16] <lz1dev> http://eclipse.gsfc.nasa.gov/SEgoogle/SEgoogle2001/SE2017Aug21Tgoogle.html
[21:16] <lz1dev> haha
[21:16] <lz1dev> it actually had my job done
[21:16] <lz1dev> thx nasa
[21:17] <Babs_> awesome. basically rather than track a point, i'll use it to generate an equation for the path over time
[21:17] <lz1dev> yep
[21:17] <infaddict> yep
[21:18] <lz1dev> the challenge then is to point the camera in the right direction
[21:18] <lz1dev> consider making a video
[21:18] <lz1dev> of the event, it would be glorious
[21:19] <infaddict> a truly amazing sight i agree
[21:19] <infaddict> if you could video the 68 seconds
[21:19] <lz1dev> i wonder if the ISS would be able to take video
[21:19] <lz1dev> would be nice if their orbit aligns with the eclipse
[21:20] <Babs_> lz1dev - using one of these to provide the camera stability
[21:20] <Babs_> http://desirerc.co.uk/controllers/v3-board.html
[21:21] <Babs_> then output the bearing and tilt angle using pwm to the board
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[21:23] <infaddict> is there a danger the payload is moving around a hell of a lot
[21:24] <Babs_> thats the point of the alexmos board. it corrects for the instability.
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[21:24] <infaddict> ah ok, so it can react quickly to even sudden movements like spinning around etc
[21:25] <lz1dev> yep
[21:26] <lz1dev> Babs_: you can still send the bearing,distance
[21:26] <Babs_> plus some sensible design should be able to minimise the buffeting even before the introduction of the board
[21:26] <lz1dev> i can make it draw the line, and make that nasa overlay available
[21:26] <lz1dev> should give us an indication how well you are pointing the camera
[21:26] <Babs_> ok great thanks
[21:26] <lz1dev> if you hardcode the eclipse path, you can do a test flight
[21:27] <Babs_> for the first one this summer, its clearly just theoretical. plus i will be launching from the U of K
[21:27] <infaddict> yer just thinking that. with the line known you can do many tests
[21:27] <Upu> launching on the day of the eclipse Babs_ ?
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[21:28] <daveake> I've pre-booked all the frequencies :)
[21:28] <lz1dev> Babs_: you can just offset the eclipse path to fall over UK
[21:28] <Babs_> ahhhh, the big dogs have joined the conversation, this is when it gets serious
[21:28] <Upu> lol
[21:28] <Babs_> arf
[21:29] <Babs_> thanks for the mosfet help upu
[21:29] <Upu> nps have you fixed the fact its connecting GND to GND ?
[21:29] <Upu> also
[21:29] <Upu> just remove it
[21:29] <Upu> you don't need it
[21:29] <Babs_> yes, used your circuit
[21:29] <Upu> lol
[21:29] <Upu> ok
[21:29] <Babs_> i know i don't need it, was operating on the JFK principal
[21:29] <Upu> I've not found a use for it yet
[21:30] <Babs_> "We use MOSFETS and the other things, not because they are easy but because they are hard"
[21:30] <Upu> iof its any concelation I ballsed up a mosfet on another board recently
[21:31] <Upu> but seriously
[21:31] <Upu> apply K.I.S.S
[21:31] <Upu> and take it off you won't need it or use it
[21:31] <Babs_> you've done some servo stuff haven't you upu?
[21:31] <Upu> not really
[21:31] <Upu> I have 2 ESC's at work and some hard drive motors
[21:32] <Upu> we can spin the motors up on demand
[21:32] <Upu> thats as far as I've gone
[21:32] <Babs_> they are powerful things huh?
[21:32] <Upu> just some motors salvages from some hard drives
[21:32] <Upu> left the platters on
[21:32] <Babs_> but anyway, http://www.azega.com/wp-content/uploads/2011/02/Arduino_Servo_1.png
[21:32] <Upu> yeah
[21:32] <Upu> like that
[21:32] <Babs_> however, my tracker board now operates on 3v3
[21:32] <Upu> the ESC's you have to send a sequence
[21:32] <Upu> to engage them
[21:33] <Upu> so run via ESC's
[21:33] <Babs_> yes, its hilarious. you end up wincing because you know at some point its going to go off
[21:33] <Upu> well I think thats the idea
[21:33] <Upu> ESC's assume they are in a helicopter
[21:33] <Upu> I think you have to hold "zero" throttle for 2 secs or something
[21:34] <Upu> anyway we can spin them up and down on demand
[21:34] <Upu> so need to make a frame next
[21:34] <Babs_> they all have different engage sequences
[21:35] <Babs_> you have to balance them once you are finished. i found a way using the iphone and an earhquake app
[21:35] <Upu> got a 3D printer last week
[21:35] <Babs_> https://www.flickr.com/photos/91049302@N00/14036326492/in/set-72157636929911016
[21:35] <Babs_> which one?
[21:35] <Babs_> i did so much 3d printing BITD ;-)
[21:35] <Upu> your frames are amazing
[21:35] <Upu> are they laser cut ?
[21:36] <Babs_> https://www.flickr.com/photos/91049302@N00/13910869973/in/set-72157636929911016
[21:36] <Babs_> i like your tilty reaction wheel idea
[21:36] <Babs_> do you mean the carbon fibre?
[21:36] <Upu> yes
[21:36] <Babs_> no, i got a dude to machine it for me
[21:36] <Babs_> a3 sheet, 28 quid fully machined
[21:36] <Upu> Some of my engineers at work are discussing buying a laser cutter between them
[21:36] <Babs_> (you have to supply the carbon fibre, 28 quid is the machining charge)
[21:36] <Babs_> anyway, servos
[21:37] <Upu> what do you design in ?
[21:37] <Babs_> sketchup
[21:37] <Upu> oh ok
[21:37] <Upu> was expecting Solid Works
[21:37] <Upu> your turn :)
[21:37] <Babs_> so my board is 3v3
[21:37] <Upu> yes
[21:37] <Babs_> because i made it work off the lower voltages
[21:37] <Upu> yep good move
[21:37] <Babs_> but 3v3 i think won't drive a servo?
[21:38] <Upu> not if its a 5V one
[21:38] <Upu> https://learn.adafruit.com/adafruits-raspberry-pi-lesson-8-using-a-servo-motor/hardware
[21:38] <Babs_> so can i just put the pwm pin out from the 3v3 circuit in http://www.azega.com/wp-content/uploads/2011/02/Arduino_Servo_1.png
[21:38] <Upu> basically yes
[21:38] <Upu> see the link I posted
[21:38] <Babs_> and power the servo separately (i.e. not do the 5v and gnd thing from my board)?
[21:39] <Upu> see above
[21:39] <Babs_> mindreader
[21:39] <Babs_> IS THERE ANYTHING UPU CANNOT DO?
[21:39] <Babs_> arf
[21:39] <Upu> I can use Google :)
[21:39] <Babs_> ok awesome. i was thinking for a moment that i would have to go back and redesign it back up to 5V
[21:40] <Babs_> cool. going to try connecting my board to the alexmos board and see what shizzle develops
[21:40] <Upu> so is this for the eclipse ?
[21:40] <Babs_> yes
[21:40] <Upu> k
[21:41] <infaddict> where in UK u launching from this year Babs?
[21:41] <Babs_> tracker board calculates viewing yaw and pitch based on position, the outputs pwm to the alexmos board which controls the gimbal, stabilisation etc.
[21:42] <Babs_> infaddict - don't know. i've done the last two from great tew
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[21:59] <infaddict> well i've managed to get the uBlox to return its current mode settings to me. ive then used those exact same settings to try and send a command to it, and sadly still no ACK.
[22:00] <infaddict> ive confirmed the uBlox is FW15 and SW 2.01 in line with the latest user manual
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[22:00] <infaddict> i'm gonna raise this with uBlox via e-mail
[22:01] <infaddict> head hurts so off to bed lol. cheers guys ;-)
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[22:20] <Babs_> is there a recommended eagle footprint for an SMA connector?
[22:21] <Babs_> the sparkfun SMA connector edge mounted looks ok?
[22:21] <Vaizki> depends on the connector
[22:22] <Upu> EDGE-SMA
[22:22] <Upu> I think
[22:22] <qyx_> yes i have stolen the sparkfnu one
[22:22] <qyx_> it is ok, i am using it constantly
[22:22] <Upu> I also use it
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[22:22] <Vaizki> upu, does that fit the connectors you sold me?
[22:22] <Upu> yes
[22:23] <Upu> the small ones
[22:23] <Vaizki> because the part you mention in the store does not exist in my eagle :)
[22:23] <Upu> link me to the one you bought ?
[22:23] <Upu> http://ava.upuaut.net/store/index.php?route=product/product&path=71_66&product_id=74 ?
[22:23] <Vaizki> hmm ok I got the short ones but the long one says BU-SMA-A
[22:23] <Vaizki> and I don't have -A
[22:23] <Upu> hang on
[22:24] <Vaizki> yea the one you linkes is the one I got
[22:24] <Upu> SparkFun SMA-EDGE
[22:24] <Vaizki> ok great
[22:24] <mattbrejza> also ebay
[22:26] <Vaizki> upu, which Sparkfun library is that in?
[22:26] <Vaizki> I have them all installed and active and can't see it
[22:26] <Upu> yeah they messed them up
[22:26] <Upu> https://www.dropbox.com/s/h4xaitcymiwv5pt/SparkFun.lbr?dl=0
[22:27] <Vaizki> ah ok that's why.. thanks again
[22:30] <Babs_> thanks everyone - got it
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[22:37] <Vaizki> upu, works a charm, I get decent automatic rf gnd connections with that parth
[22:37] <Vaizki> cheers
[22:37] <Upu> nps
[22:39] <Vaizki> I guess those bridges are somehow automatically spec'd so I have some chance in hell of heating the pad up enough to solder?
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[22:40] <Upu> wouldn't worry about that
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[22:42] <Vaizki> ok but I can't guess any other reason why my ground plane connecttions have a pad with 4 bridges to surrounding gnd-plane
[22:43] <Upu> yeah its the thermals part
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[22:45] <Vaizki> damn nice part that SMA_EDGE
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[22:57] <Geoff-G8DHE> Can Matt swim I wonder ?
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[00:00] --- Mon Feb 16 2015