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'[EE]: I need an accelerometer...'
2002\01\02@131355 by steve

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I'm looking for an accelerometer, preferable something that is PCB
mountable. I've never used them before though, so I would like to know
what else is out there. So far everything I've seen is relatively
expensive (>$25). Any suggestions?

In my application I shouldn't see more than 3-4gs, but it will be prone
to vibration. Do vibrations ever cause problems when you are trying to
make acceleration measurements?

Thanks!

Steve Ruse

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2002\01\02@162242 by steve

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Precision of .1g would be enough, an extra digit would be a nice bonus,
but I wouldn't pay more than a dollar for it. As for frequency, I'm not
familiar with accelerometers at all, does that refer to the frequency
at which it updates? Does this only apply to the DCM outputs? I would
most likely use the analog output. Also, the Analog Devices lists the
price of the ADXL202 at $15 and up in quantities of 500+, what
distributors carry them? I'd really like to find something more in the
sub $4 range.

Thanks for the help!

Also, sorry about the reply to address, right now I'm away from my
computer and using webmail. I changed the reply to address to the
piclist address when I sent the message, but apparently it didn't work.

Steve

----- Original Message -----
From: "Don Hyde" <spam_OUTDonHTakeThisOuTspamaxonn.com>
To: <.....steveKILLspamspam@spam@wotelectronics.com>
Sent: Wednesday, January 02, 2002 2:24 PM
Subject: RE: [EE]: I need an accelerometer...


> You don't mention anything about the precision you need or the
frequency
> range.  If you're building an inertial measurement unit for an ICBM,
you
> will need a very good and very expensive one (and certain people will
want
> to ask you about your project), but for something more ordinary,
there are
> some excellent, inexpensive ones available.
>
> I've used the Analog Devices units on one project.  In this case we
needed
> +-50g, so the accelerometers were more expensive, in the $30 range,
but the
> ADXL202 at +-2g (I think) is only a couple of dollars in quantities.
These
> are micromachined silicon devices which are manufactured by processes
quite
> similar to IC chip production, and are packaged in the same sort of
packages
> as IC's, so they can be handled and soldered just like any IC.  The
ADXL202
> even comes in an SMT package that's only about 1/4" square.  They are
cheap
> because they are used in airbag sensors.
>
> They output a voltage proportional to acceleration, and can be hooked
> directly to a PIC A/D input.  They tend to have good accuracy and
response
> up to about 1KHz, so they can be used to measure vibrations.  If you
don't
> want to see the vibrations, then you will need a low-pass filter,
either in
> software (easiest is to average a bunch of samples), or in hardware
with
> some R's and C's and maybe an op-amp or two.
>
> > {Original Message removed}

2002\01\02@194630 by M. Adam Davis

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Since accelerometers are made using a fairly expensive process (which
should change over the next few years) you will likely not find one at
the price range you appear to be after.  If you only need one or two,
you can get free samples from analog and others.

Please note that the adxl202 will only measure up to 2G.  It can
withstand more, but if you need to measure more you should go with the
adxl210.

-Adam


Steve Ruse wrote:

{Quote hidden}

>>>{Original Message removed}

2002\01\03@014205 by Steve Faulkner

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I got 2 free samples of the adxl202. Just filled-out the form with perfectly
honest answers - and I was shocked when the next morning I received an
overnight delivery of the 2 chips!

----- Original Message -----
From: "M. Adam Davis" <EraseMEadampicspam_OUTspamTakeThisOuTUBASICS.COM>
To: <PICLISTspamspam_OUTMITVMA.MIT.EDU>
Sent: Wednesday, January 02, 2002 4:44 PM
Subject: Re: [EE]: I need an accelerometer...


{Quote hidden}

> >>>{Original Message removed}

2002\01\03@020103 by Randy Glenn

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Works best for American addresses... I got dinged $40CAD for customs and
taxes for my two to come to Canada.

-Randy Glenn

Measure twice, cut once, curse, discard. Repeat.
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{Original Message removed}

2002\01\03@031421 by M. Adam Davis

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I got mine a little while ago, and finally hooked one up to a 'f877.
Right now I'm brute force counting cycles, but am working towards using
the ccp modules with interrupts to do it automatically.

-Adam

Steve Faulkner wrote:

{Quote hidden}

>>>>>{Original Message removed}

2002\01\03@185852 by Mark Newland

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1) Companies usually don't have the time to analyis each incoming request.

2) They know that a certain percentange of people getting the parts will come
back for more.  They just playing the odds.  Even if you don't buy them, you
might recomend the parts to someone who does.

Steve Faulkner wrote:

{Quote hidden}

> > >>>{Original Message removed}

2002\01\05@041603 by Peter L. Peres

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> Works best for American addresses... I got dinged $40CAD for customs and
> taxes for my two to come to Canada.
>
> -Randy Glenn

Yow! What did they list them as in the customs ledger? Uncut diamonds?

On the same vein, I am  always hunting for bargains but I am reluctant to
buy because of horror stories I keep hearing about customs etc having
their own ideas about the items.

Peter

(Writing from a country that excises a 120% import tax on cars, even used
ones - this is NOT a joke)

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2002\01\05@081215 by Tim McDonough

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> > Works best for American addresses... I got dinged $40CAD for customs and
> > taxes for my two to come to Canada.
> >
> > -Randy Glenn
>
> Yow! What did they list them as in the customs ledger? Uncut diamonds?
>
> On the same vein, I am  always hunting for bargains but I am reluctant to
> buy because of horror stories I keep hearing about customs etc having
> their own ideas about the items.

The last samples I got from National came via FedEx. I believe that anything
shipped to Canada via FedEx or UPS goes through a bonded warehouse, etc. By
the time all the fees get tacked on it costs the Canadian customers a
fortune. I routinely ship products to Canadian destinations via the regular
mail and none of this silliness happens.

Tim

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2002\01\05@122827 by Bob Barr

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On Fri, 4 Jan 2002 11:43:55 +0200, "Peter L. Peres" wrote:

<snip>

>
>(Writing from a country that excises a 120% import tax on cars, even used
>ones - this is NOT a joke)

I certainly wouldn't call a 120% tax a joke; I'd call it an obscenity.

Regards, Bob

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2002\01\05@141339 by Randy Glenn

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I get National samples without problem. I think that the problem with the
Analog Devices samples was that they sent them in a nearly one metre long
box - a full tube, for two small ICs. That probably piqued the interest of
customs folk.

If I can find the photos, I'll post 'em - it was actually kind of funny.
Except that I had to pay for it.

-Randy Glenn

Measure twice, cut once, curse, discard. Repeat.
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{Original Message removed}

2002\01\05@143915 by Fabio Pereira

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> I get National samples without problem. I think that the problem with the
> Analog Devices samples was that they sent them in a nearly one metre long

What is the part number of the National accelerometer ????

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2002\01\05@180616 by Randy Glenn

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No, it's not a National accelerometer. Someone was mentioning the National
Semiconductor sample system costing Canadians, and I wanted to point out
that it doesn't.

-Randy Glenn

Measure twice, cut once, curse, discard. Repeat.
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{Original Message removed}

2002\01\05@212234 by Dave King

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At 02:12 PM 1/5/02 -0500, you wrote:
>I get National samples without problem. I think that the problem with the
>Analog Devices samples was that they sent them in a nearly one metre long
>box - a full tube, for two small ICs. That probably piqued the interest of
>customs folk.
>
>If I can find the photos, I'll post 'em - it was actually kind of funny.
>Except that I had to pay for it.
>
>-Randy Glenn

You mean the two samples per tube. in a long antistatic bag, which is then
put in a antistatic box and then in a shipping box?

Don't see how that could ever get customs excited.......

Dave
5 samples richer and $40 CDN peso's poorer

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