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'PICs in model rocketry'
1997\03\09@161659 by Matt Calder

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       Does anyone know of designs for a PIC
based altimeter for use in model rocketry?

/*****************************************/
/* Matt Calder, Dept. of Statistics, CSU */
/* http://www.stat.colostate.edu/~calder */
/*****************************************/

1997\03\09@194555 by crbres

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Matt Calder wrote:
>
>         Does anyone know of designs for a PIC
> based altimeter for use in model rocketry?
>
> /*****************************************/
> /* Matt Calder, Dept. of Statistics, CSU */
> /* http://www.stat.colostate.edu/~calder */
> /*****************************************/


Matt,

Not exactly what you are looking for, but I remember a model rocketry
altimeter project in Radio Electronics or its latest incarnation Electronics
Now. I think it was around '90 or '91. I think the code was for a Motorola
micro, but porting it over to a PIC is always an option.

Ken Pergola

1997\03\10@022513 by Tim Kerby

picon face
If you find a whole project - tell me please!
I have beem looking for something like this for ages.  A pic could also
handle burn temp, velocity, G Force, and a load of other stuff too.


Thanks

Tim


At 14:15 09/03/97 -0700, you wrote:
{Quote hidden}

------------------------------------------------------------------
Personal Web Pages: http://web.ukonline.co.uk/members/tim.kerby/
PIC Site: web.ukonline.co.uk/members/tim.kerby/pic/
The PIC Pages are under construction and I am looking for projects
------------------------------------------------------------------

1997\03\10@031858 by John Dammeyer

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At 07:46 PM 09/03/1997 -0800, you wrote:
>Matt Calder wrote:
>>
>>         Does anyone know of designs for a PIC
>> based altimeter for use in model rocketry?
>>
>> /*****************************************/
>> /* Matt Calder, Dept. of Statistics, CSU */
>> /* http://www.stat.colostate.edu/~calder */
>> /*****************************************/
>
>
>Matt,
>
>Not exactly what you are looking for, but I remember a model rocketry
>altimeter project in Radio Electronics or its latest incarnation Electronics
>Now. I think it was around '90 or '91. I think the code was for a Motorola
>micro, but porting it over to a PIC is always an option.
>
It was around then.  Called a pocket Altimeter and used a Motorola Pressure
sensor.  They also had a really nice water column method of calibrating the
sensor.  Alas the magazine developed paws and wandered off perhaps to be
captured by another magazine lover.

John
Pioneers are the ones, face down in the mud,
with arrows in their backs.
Automation Artisans Inc.      Ph. 1-250-544-4950
PO Box 20002                  Fax 1-250-544-4954
Sidney, BC CANADA V8L 5C9

1997\03\10@101145 by Craig Bladow
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    Matt Calder wrote:
    >
    >         Does anyone know of designs for a PIC
    > based altimeter for use in model rocketry?
    >
    > /*****************************************/
    > /* Matt Calder, Dept. of Statistics, CSU */
    > /* http://www.stat.colostate.edu/~calder */
    > /*****************************************/

    Matt,

    Try the Sunsite Archive at:

    http://sunsite.unc.edu/pub/archives/rec.models.rockets/ELECTRONICS/

    Look at the files altimet.zip and altigif.zip both are
    based on the PIC based Basic Stamp.

    I am working on a PIC based model rocket altimeter design.
    I plan to use an absolute pressure sensor salvaged from a weather
    balloon electronics package and log the flight data into a serial
    eeprom.

    I would appreciate any information anyone might have on using the
    pressure sensors found on the Radiosonde weather balloon circuit
    boards, they are in a metal can - 8 lead package with the following
    marking:   SDC 909-4502803 07

    Craig Bladow

    /******************************************************/
    /*  Craig Bladow - Embedded Systems Project Engineer  */
    /*  Dana Corporation - Ottawa Lake Michigan           */
    /*  spam_OUTcraigbTakeThisOuTspamcompuserve.com                             */
    /*  http://ourworld.compuserve.com/homepages/craigb   */
    /******************************************************/

1997\03\10@113635 by Andy Kunz

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At 02:15 PM 3/9/97 -0700, you wrote:
>
>        Does anyone know of designs for a PIC
>based altimeter for use in model rocketry?
>
>/*****************************************/
>/* Matt Calder, Dept. of Statistics, CSU */
>/* http://www.stat.colostate.edu/~calder */
>/*****************************************/

Matt,

I did an altimeter using a PIC and a Motorola absolute pressure sensor.

Andy

==================================================================
Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865
         Hardware & Software for Industry & R/C Hobbies
       "Go fast, turn right, and keep the wet side down!"
==================================================================

1997\03\10@133259 by Tim Kerby

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Hi
How did you get hold of a radiosonde.  If you found it you are supposed to
return them!


Tim



At 09:53 10/03/97 -0500, you wrote:

{Quote hidden}

------------------------------------------------------------------
Personal Web Pages: http://web.ukonline.co.uk/members/tim.kerby/
PIC Site: web.ukonline.co.uk/members/tim.kerby/pic/
The PIC Pages are under construction and I am looking for projects
------------------------------------------------------------------

1997\03\10@141242 by techccs

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Tim Kerby wrote:
{Quote hidden}

Tim,

  These devices can be purchased from Electronics Goldmine.

Brian
--
==================================
= New Ideas come from those who  =
= didn't know it wasn't possible =
==================================

1997\03\10@155400 by Octavio Nogueira

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> Matt,
>
> Not exactly what you are looking for, but I remember a model rocketry
> altimeter project in Radio Electronics or its latest incarnation
Electronics
> Now. I think it was around '90 or '91. I think the code was for a
Motorola
> micro, but porting it over to a PIC is always an option.
>
> Ken Pergola

It's on Radio Eletronics, october 1990 and I have this issue, if anyone
need it
I can scan and send.

Octavio
========================================================
Octavio Nogueira
e-mail:   .....nogueiraKILLspamspam.....mandic.com.br
homepage: www.geocities.com/SiliconValley/Pines/6902/index.html
voice/fax: +55 11 240-6474
"ProPic" The first Production PIC Programmer running in
Windows and under US$ 20.00.
========================================================

1997\03\10@170854 by Philip Restuccia

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> > Matt,
> >
> > Not exactly what you are looking for, but I remember a model rocketry
> > altimeter project in Radio Electronics or its latest incarnation
> Electronics
> > Now. I think it was around '90 or '91. I think the code was for a
> Motorola
> > micro, but porting it over to a PIC is always an option.
> >
> > Ken Pergola
>
> It's on Radio Eletronics, october 1990 and I have this issue, if anyone
> need it
> I can scan and send.
>
> Octavio
>


Octavio:

If you do this, I'm pretty sure you will be violating the magazine's copyrights.
I believe they prohibit any duplication of their articles in any form without
express
written permission of the publishers.  You'd best check first.

       Philip Restuccia
       EraseMEphilip.restucciaspam_OUTspamTakeThisOuTperi.com

1997\03\11@071738 by Kalle Pihlajasaari

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Hi Tim,

> How did you get hold of a radiosonde.  If you found it you are supposed to
> return them!

You can buy, beg or find them quite legitemately.  Those found have
no real value besides possibly the location they were found at and if you
actually find the specific site that launched the sonde they will be
interested in the location and the time you found it, possibly serial number
but they may not keep records of them.

These devices are sold for about US$ 50 and are single use.  I have a
few in my collection (4 types) and none of them actually indicate they
might be wanted back.  The one that Electronics Goldmine sells Which has
SDC Presure sensor has on the printed box the statement :

  "This instrument can be safely discarded into any trash receptacle"

Also other statements to the effect that it wont explode &c.

There are other makes that are available but no others that I know
of on the surplus market.

> >     I would appreciate any information anyone might have on using the
> >     pressure sensors found on the Radiosonde weather balloon circuit
> >     boards, they are in a metal can - 8 lead package with the following
> >     marking:   SDC 909-4502803 07

It will be a silicon resistive strain bridge measuring absolute pressure
(rear side of diaphragm at vacuume) and one would be best served by
tracing the circuit of the sonde to find out how it is used.  The
circuit first generates a voltage from the pressure transducer and then
selects one of 6 voltages (pressure, temp, humidity, ?, HIref, LOref)
and feeds it into a V-to-F converter which is then used to modulate
the radio section which is almost so simple that it does not look like
it can be a transmitter (one transistor and a Teflon spaced tuner
capacitor with a 1/4 wave groundplane antenna).

Problems with the sensors and the circuit in the sondes is that they
are not made for long term stability and are reference callibreated
on the ground at the time of launch.  For Rocket use this should not
be much of a problem but for long term climate studies I would
hesitate to trust the stability without carefull characterisation.

Interfacing to a Stamp or PIC might be possible to do with just one
arm of the  bridge in resitive mode for Rocket applications as the
time is so short there will not be much temperature drift.  Otherwise
you will need to put in a bridge amplifier and then amplify result
to feed a A/D or V/F converter.  It was relatively easy to get the
sonde board to generate a single freguency by bypassing the MUX
chip and feeding the pressure output directly to the V/F converter
and then one could use that output to feed a FREQIN or something
on a Stamp or PIC.  The Audio tone at about 1.2kHz or something
gets real irritating after a while when playing with it and in the
end you just stick to the scope and F-counter even though audio is
a faster way to detect changes.

Cheers
--
Kalle Pihlajasaari   kallespamspam_OUTip.co.za   http://www.ip.co.za/ip
Interface Products   P O Box 15775, DOORNFONTEIN, 2028, South Africa
+ 27 (11) 402-7750   Fax: 402-7751    http://www.ip.co.za/people/kalle

DonTronics, Silicon Studio and Wirz Electronics uP Product Dealer

1997\03\11@170810 by Karoly Hoss

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Philip Restuccia wrote:
>
> > > Matt,
> > >
> > > Not exactly what you are looking for, but I remember a model rocketry
> > > altimeter project in Radio Electronics or its latest incarnation
> > Electronics

what's the partnumber for the alt sensor by motorola ?

bye
charley

1997\03\12@104915 by Andy Kunz

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At 12:07 AM 3/11/97 +0100, you wrote:
>what's the partnumber for the alt sensor by motorola ?
>
>bye
>charley

Charley,

Visit http://www.design-net.com and look for the MPX parts (site search on
MPX).  The MPX4100 and MPX5100-series parts have what you want.  Form
factor is important.

Andy

==================================================================
Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865
         Hardware & Software for Industry & R/C Hobbies
       "Go fast, turn right, and keep the wet side down!"
==================================================================

1997\03\12@185911 by Karoly Hoss

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Andy Kunz wrote:
>
> At 12:07 AM 3/11/97 +0100, you wrote:
> >what's the partnumber for the alt sensor by motorola ?
> >
> >bye
> >charley
>
> Charley,
>
> Visit http://www.design-net.com and look for the MPX parts (site search on
> MPX).  The MPX4100 and MPX5100-series parts have what you want.  Form
> factor is important.
>
thanx for the info . the motorola site is ugly but useful :)

bye
charley

1997\03\13@011222 by Tom Halaczkiewicz

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Craig Bladow wrote:

>     I would appreciate any information anyone might have on using the
>     pressure sensors found on the Radiosonde weather balloon circuit
>     boards, they are in a metal can - 8 lead package with the following
>     marking:   SDC 909-4502803 07
>
>     Craig Bladow
>
I may be able to help you.  Is this a TO-8 can with a hole in the top?
What is  the pin configuration (how many pins per row?)  If it is a TO-8
type pressure sensor it would be much simpler to get a new one (they are
not expensive), rather than try to reuse one.  There are only a few number
of manufacturers of this type of part - and all of their sensors have very
similar electrical characteristics.

Tom Halaczkiewicz


'PICs in model rocketry'
1997\04\03@103951 by Dave Duchesneau
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At 11:01 AM 3/10/97 -0500, you wrote:
{Quote hidden}

Any chance that you'd share the schematic and source for this? (Otherwise,
why mention that you'd done it...)

Dave Duchesneau
(Who'd like to make an altimeter to fit inside a 1" tube)

1997\04\03@142433 by Andy Kunz

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At 07:41 AM 4/3/97 -0800, you wrote:
>At 11:01 AM 3/10/97 -0500, you wrote:

You sure haven't read your mail in a while!

>>I did an altimeter using a PIC and a Motorola absolute pressure sensor.

>Any chance that you'd share the schematic and source for this? (Otherwise,
>why mention that you'd done it...)

Well, why not is because it was a proprietary item for somebody, and I
can't release that source code.  However, it was rather simple:

PIC16C711 pin 17 to Motorola MPXS4100A6U Analog output (I forget which
pin).  Software does the following:

On reset:
       Turn on "Calibrating" LED, turn off "Ready"
       Wait 15 seconds to warm up sensor (required by Mot).
       Turn on "Ready" LED, turn off "Calibrating"
       Call the current reading "0" elevation.
       While the current reading is 0 +/- 2 bits or so
               do nothing!
       Endwhile
       As fast as possible (10mS) store readings into the EEPROM
       until the EEPROM is full (2K or more samples, about 10 secs per K).

The EEPROM is read into a PC, and the readings are plotted out to form a
chart showing altitude vs. time.

>(Who'd like to make an altimeter to fit inside a 1" tube)

Dave

Now you have everything you need.  This is an ideal application of the
PIC12C7x part.

Andy

==================================================================
Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865
         Hardware & Software for Industry & R/C Hobbies
       "Go fast, turn right, and keep the wet side down!"
==================================================================

1997\04\04@014921 by wterreb

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>>  Does anyone know of designs for a PIC
>>  based altimeter for use in model rocketry?

Very recently I stumbled upon a design somewhere on the web that does
EXACTLY this.  The documentation provided is great, complete with a
good description, circuit diagrams, part lists and code listings.  The design is
an improvement on a similiar altimeter desing for Model Rockets that was
published in
RADIO-ELECTRONICS of October 1990, and uses the Basic-Stamp as its
processor.   I can really recommend very strongly that you look at
this article.  It even features some ingenious way of reading the
data from the altimeter.

I still have a printout of the original article, but I do not know anymore what
the URL of the website is.  If you want to search for it on the web,
use keywords like Herve Cousin (the author), SCX15AN, Sensym etc.   I
also still have the original article on my computer at home, so if you
don't find it, then please email me at @spam@wernerKILLspamspamaztec.co.za and I will
email it directly to you.

Rgds
Werner
--
Werner Terreblanche     http://www.aztec.co.za/users/werner
KILLspamwterrebKILLspamspamplessey.co.za (work)  OR  RemoveMEwernerTakeThisOuTspamaztec.co.za  (home)
Plessey SA, PO Box 30451,Tokai 7966, Cape Town, South Africa
or at home : Suite 251, PostNet X5061, Stellenbosch, 7599
Tel +27 21 7102251  Fax +27 21 7102886  Home +27 21 8872196
------------------------------------------------------------

1997\04\04@020022 by wterreb

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Dave

 Just after sending  a reply to the piclist regarding your posting,
I discovered that the email address of  Herve Cousin, the author of
this excellent altimeter web page.  I suggest
you contact Herve Cousin  <spamBeGonecousinspamBeGonespaminorg.chem.ethz.ch> and ask him for
the URL of his web page.  Its really worth it to look at.

Rgds
Werner
--
Werner Terreblanche     http://www.aztec.co.za/users/werner
TakeThisOuTwterrebEraseMEspamspam_OUTplessey.co.za (work)  OR  RemoveMEwernerspamTakeThisOuTaztec.co.za  (home)
Plessey SA, PO Box 30451,Tokai 7966, Cape Town, South Africa
or at home : Suite 251, PostNet X5061, Stellenbosch, 7599
Tel +27 21 7102251  Fax +27 21 7102886  Home +27 21 8872196
------------------------------------------------------------

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