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High altitude balloon payload, from Sable-3 discussion
nprev
post Oct 12 2007, 01:55 PM
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Yes...Ad astra per scientiam, Doug! smile.gif...and please remember to let go of it at launch while both of your feet are on the ground... sad.gif tongue.gif


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djellison
post Oct 14 2007, 11:32 PM
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Some more bits and pieces have arrived - but there are still a lot of 'unknown unknowns' that we'll need. Thus ignore the %'ge at the end...it's a flawed figure anyway as each step from 1 to 7 probably requries as much time and effort as the cumulative time and effort of all previous steps. I'll do a Vodcasty thing this week - a UMSFB1 Show and Tell.

Doug
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elakdawalla
post Oct 14 2007, 11:41 PM
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Time to start a naming contest yet? rolleyes.gif

To make things different, you could require people justify the name choice by writing a haiku in its support biggrin.gif

--Emily


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lyford
post Oct 15 2007, 04:27 AM
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elakdawalla
will doug let us really do
haiku named balloon?


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jamescanvin
post Oct 15 2007, 11:09 AM
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QUOTE (elakdawalla @ Oct 15 2007, 12:41 AM) *
Time to start a naming contest yet? rolleyes.gif


And to start taking entries for the compulsory 'fly your name to...' rolleyes.gif


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djellison
post Oct 15 2007, 01:03 PM
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Just popped home - the mirrors have arrived - that's all the prospective imaging payload in place - except a final choice on powering them.

The naming is one of those messy things that I've simply eradicated by acronym deployment. UMSFB1 (then 2, 3, 4, 5 etc)

And as for flying your name...there will be just one name flying onboard - it shouldn't take a genius to figure out who's (given the sort of flight involved) but not quite sure how to action that just yet.


Doug
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djellison
post Oct 15 2007, 05:23 PM
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PICAXE AHOY ohmy.gif

Got a few relays, and a buzzer, and some AA battery holders today. Wasn't getting 4-5v out of the 3xAA battery holder that the picaxe kit came with - so I got a 4 cell holder, put NiMH's in it ( 5.2v measured ) - and bingo - I was able to program it via the USB cable. Did a few BASIC programs that triggered the buzzer - and bingo

CODE
main:
high 1
pause 250
low 1
pause 1000
goto main


'Bzzz............Bzzzz'

OOo

CODE
main:
high 1
pause 50
low 1
pause 100
high 1
pause 50
low 1
pause 200
high 1
pause 50
low 1
pause 100
high 1
pause 50
low 1
pause 1000
goto main


"Bzz.Bzz....Bzz..Bzz......"

YAY!

Maybe tonight, but certainly later this week ,I want to hook that same 'bzzz' onto a couple of different types of relay I've got - see if they'll do the job for the cameras.

Doug
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djellison
post Oct 15 2007, 07:43 PM
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IT WORKS

I did a simple

CODE
main:
  high 0
  pause 1000
  low 0
  wait 10000
  goto main:


The output of output zero was then wired to a bit of breadboard that powers a relay ( the top one - http://www.maplin.co.uk/module.aspx?Module...5&doy=15m10 ) . The Picaxe project board runs on 5v, and each output will handle 800 mA. The relay's coil is spec'd to be about 500 ohms - I'm measuring it at something like 480ish at the breadboard. So it draws a current of 10 mA for that second. The outputs of the relay then pop to another tiny bit of breadboard which I simply used to make it easier to hook up to the shutter release cables from the camera. The camera is hard-wired to the C-cell sized battery holder.

At first it wasn't working - but then I realised I was asking it to to 'high 0' and then 'low 1' which was just stupid - the Gumby school of coding.

But now - it works smile.gif Attached - what our sofa looked like just after I turned it off.
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ngunn
post Oct 15 2007, 08:06 PM
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QUOTE (djellison @ Oct 15 2007, 02:03 PM) *
there will be just one name flying onboard - it shouldn't take a genius to figure out who's (given the sort of flight involved)


Would that be Mr Helium?
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djellison
post Oct 15 2007, 09:26 PM
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Mr & Mrs Latex.
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ElkGroveDan
post Oct 15 2007, 09:39 PM
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I'm hoping that somewhere obvious on it will be a name. As in "If found please return to Doug Ellison....."

Or maybe you should specify on which side of the Channel -- Doug in the UK, Climber or Ant103 in France. laugh.gif


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djellison
post Oct 15 2007, 09:58 PM
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One of the payloads that they let aloft from Cambridge made it to Denmark - and was returned ohmy.gif

Doug
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ElkGroveDan
post Oct 15 2007, 10:03 PM
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Better include Bjorn's contact info, just in case.


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djellison
post Oct 15 2007, 10:24 PM
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Just contacted the CAA ( UK's version of the FAA ) asking for regs on unmanned balloons, offering to launch when and where suits them, rather than stipulating such things from our end.

Meanwhile, I"m hoping that by this weekend, I will be able to have all cameras breadboarded ( three internal and one external ).

I'll be switching to pairs of AA Lithium (low temperatures, what low temperatures - they just don't care) cells in series ( to give me the 3v that the cameras require ) but probably four pairs for the three cameras, a further two in parallel for the GMC, and three or four for the PicAxe. The APRS will be off a single 9V

Doug
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djellison
post Oct 19 2007, 07:39 AM
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Video Update 1 - Envelope, Parachute, Gondola
http://youtube.com/watch?v=rkug-Z9Xm5Q

Video Update 2 - Cameras
http://youtube.com/watch?v=gu3P3O3Z3eU

Update 3 - Tracking - on it's way later.
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