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'[EE]: Ozzies and others'
2001\12\23@181209 by Peter Ridgeway

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Hi,
I am building a new type of accelerometer which shall be tested at Woomera
Spaceport (the old historic launch site in South Australia) around July, on
a MK4 or MK15 (Zuni) rocket.  For simplicity, I want to base my electronics
on a PIC chip and EEprom, but i don't have much experience with PIC's yet.
If anyone out there who knows PIC's well would like to help, it will be a
great and challenging project, and a chance to really put the chips to the
test (I need them to log large quantities of info from ADC's in the
~2seconds the rocket goes up... thousands of feet at around 60g (~580m/s/s!)
If I could, I would like to be able to have practical help if someone lives
locally (Sydney) but I'll be keeping this list posted as to any problems,
anything we find about PIC's under such harch environments, and eventually
the schematic for the thing [if Kistler Aerospace, who run this thing, will
let me :-)].  Any help from any PICers anywhere would be appreciated, though
you might want to email me personly to avoid clogging up the list...
spam_OUTpeterar_83TakeThisOuTspamhotmail.com
Happy PICn all,
Peter




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2001\12\23@192111 by David VanHorn

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>
>~2seconds the rocket goes up... thousands of feet at around 60g (~580m/s/s!)

I would be very cautious around the crystal, and battery connections.
In hobby rocketry(HPR) we've had a number of failures that look to me like
the crystal either stopping, or ?? due to the acceleration.  We get into
that sort of region on the high end.
Resonators don't seem to fail that way, and of course there's always
internal R/C oscillators.


Battery holders using springs are problematic, because the springs can
compress and break the contact.  The first order solution is to put the
springs on the nose end, then you discover that the deceleration forces can
be quite appreciable when you hit burnout as well.

Sitting across the acceleration axis is probably best, if you have the room.
Welded tabs and soldered wires is the best alternative, I think.

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2001\12\23@215851 by Jon Baker

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<snip>
> on a PIC chip and EEprom, but i don't have much experience with PIC's yet.
<snip>
> If anyone out there who knows PIC's well would like to help, it will be a
> great and challenging project, and a chance to really put the chips to the
> test

Hi Peter.
Sounds like the kind of thing I'd do if I were launching rockets. I was in
oz for a year and a bit and did a lot of travelling. Would have been nice to
visit.. but I didnt think woomera welcomed visitors ( thought it was in one
of those military areas)

Just a couple of thoughts. My first was that eeproms are slow to write to so
if you were going to use them, you would need a PIC with a large enough
memory to buffer the information as it was coming in.

My second was that with the amount of data I imagine you would like to
collect- ie.. as much as possible.. there isn't a pic with enough memory..
or in fact processor speed to do what you really need for the job. :( shame,
but I think its the truth.. perhaps once the picDSP chips come on the
shelves

I have no experience using the scenix chips.. I have no idea what the real
differences are between them and pics, or the range they have to offer.. but
I do know; they run at much higher speeds ( dont know about ram though) ..
so it might be worth looking into them as an alternative.

(I need them to log large quantities of info from ADC's in the

large quantities.. you mean 1000 samples a second or a million. how much do
you need?

> ~2seconds the rocket goes up... thousands of feet at around 60g
(~580m/s/s!)

hahaha. 60g.. better do dome good soldering on that circuit board !

> If I could, I would like to be able to have practical help if someone
lives
> locally (Sydney)

bummer. I left a few months ago :(

Good Luck.
--
Jon Baker

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2001\12\28@061848 by Roman Black

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Peter Ridgeway wrote:
>
> Hi,
> I am building a new type of accelerometer which shall be tested at Woomera
> Spaceport (the old historic launch site in South Australia) around July, on
> a MK4 or MK15 (Zuni) rocket.  For simplicity, I want to base my electronics
> on a PIC chip and EEprom, but i don't have much experience with PIC's yet.
> If anyone out there who knows PIC's well would like to help, it will be a
> great and challenging project, and a chance to really put the chips to the
> test (I need them to log large quantities of info from ADC's in the
> ~2seconds the rocket goes up... thousands of feet at around 60g (~580m/s/s!)
> If I could, I would like to be able to have practical help if someone lives
> locally (Sydney) but I'll be keeping this list posted as to any problems,
> anything we find about PIC's under such harch environments, and eventually
> the schematic for the thing [if Kistler Aerospace, who run this thing, will
> let me :-)].  Any help from any PICers anywhere would be appreciated, though
> you might want to email me personly to avoid clogging up the list...
> .....peterar_83KILLspamspam@spam@hotmail.com

I'm 1 hour from Sydney and interested in your
project. I have some experience getting good data
rates with PICs. What did you have in mind?
-Roman

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