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'[PIC:] [PIC]: PIC based Inclinometer'
2004\07\07@183536 by Kev Pearce (kevp.com)

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Hi all,

Does anyone know of any devices that can measure angles with an accuracy of 0.1 degree?

A friend has asked me if I can make one for his workshop. Ideally something with some sample PIC code in basic or C that I can start with.

I've seen a few accelerometers that can do angles but they are always +- 1 degree. If I can make one thats 0.1 degree then I can use it on my car suspension setup too, to set the camber etc.


Cheers for your help all

Kev/.

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2004\07\07@184203 by Robert B.

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Schaevitz sensors makes one called the Accustar II.  IIRC it's good to about
0.01 degrees and operates through some capacitive bubble effect.  Very slow
update rate, but very accurate.  I never got to use it since I needed
something in the 60Hz refresh rate instead of the 4 Hz it supplied.  I think
they're relatively inexpensive for the resolution as well.


{Original Message removed}

2004\07\07@184204 by David VanHorn

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At 11:36 PM 7/7/2004 +0100, Kev Pearce (kevp.com) wrote:

>Hi all,
>
>Does anyone know of any devices that can measure angles with an accuracy of 0.1 degree?

Look up inclinometers.

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2004\07\07@193030 by John Ferrell

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My goodness!
Tan(0.1) = 0.00017453293
In 10 feet (120 inches) that is tan(.01)*120 = 0.020943952 or about 21
thousands of an inch.

To measure that in my shop I would place a steel beam on the floor and put
21 thou's of shims at the 10 foot mark.

That is If I had a floor that flat or a beam that rigid!
Do you really need that accuracy?

May be my math is off? One degree accuracy looks pretty good to me...

John Ferrell
http://DixieNC.US

{Original Message removed}

2004\07\07@212208 by Russell McMahon

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> Does anyone know of any devices that can measure
> angles with an accuracy of 0.1 degree?

Pseudo randon thunks:

If you don't mind mechanical swinging thingies then capacitive techniques
are easily capable of this.

Even a weghted arm and a resolver of some sort would do. This could be an
optical rotation transducer - either absolute (expensive) or just with
standard two opto interupters out of phase (as in eg a mouse) etc

90/0.1 = 900 = 10 bits
Doable with analog methods, but using an interupter would probably be far
easier.
Needs zeroing before use.

GMR sensors do this electronically relative to a magnetic field.


       RM

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2004\07\08@022737 by Kev Pearce (kevp.com)

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Thnank Rob,

Looks exactly what I need, I knew someone would know!!
I looked up Schaevitz to see if they have a UK office and they are based not
five miles from my house!!!!
I'll call them today...

Cheers

Kev/.

{Original Message removed}

2004\07\08@150442 by Aaron G.

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On Wed, 7 Jul 2004 19:29:35 -0400 John Ferrell
<spam_OUTjohnferrellTakeThisOuTspamEARTHLINK.NET> writes:
> In 10 feet (120 inches) that is tan(.01)*120 = 0.020943952
>
> May be my math is off? One degree accuracy looks pretty good to me...

John,

Original poster wanted 0.1 degree resolution, but it looks like you
calculated it to 0.01 degree.

Aaron

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2004\07\12@144923 by John Ferrell

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(Blush) I sure did!

John Ferrell
http://DixieNC.US

----- Original Message -----
From: "Aaron G." <controlsdude2000spamKILLspamJUNO.COM>
To: <.....PICLISTKILLspamspam.....MITVMA.MIT.EDU>
Sent: Thursday, July 08, 2004 3:06 PM
Subject: Re: [PIC:] [PIC]: PIC based Inclinometer


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