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PICList Thread
'[PIC]: Inclinometer'
2003\06\20@121301 by Joel Middleton

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First off thanks to everyone who helped me out with
the servo problem I was having. I got a new PIC and
everything  seems to be working fine.

I am looking for an inclinometer that I can interface
with a PIC, preferrably in a package that would be
easy to work with and won't drain my bank account to
purchase. Anyone have any suggestions or is this a
pipe dream?

Thanks

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2003\06\20@121918 by Art

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Lucas makes high end inclinometers, usually out of the price range for
hobby use.

However, they do show up on ebay from time to time.

I have one of their inclinometers, but it has an odd output and needs a PIC
in the worst way!!!

Good luck,

Art

At 09:11 AM 6/20/03 -0700, you wrote:
{Quote hidden}

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2003\06\20@124626 by Alan B. Pearce

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>I am looking for an inclinometer that I can interface
>with a PIC, preferrably in a package that would be
>easy to work with and won't drain my bank account to
>purchase. Anyone have any suggestions or is this a
>pipe dream?

You can build an inclinometer using an ADXL202. Use the pulse width
modulated outputs into the CCP module to get the PIC to measure it. Mount
the ADXL202 so the 2 sensors axes at 45 degrees to horizontal at 0 incline.
Now a little maths will calculate the angle of incline. Analog devices have
an application note on interfacing the ADXL series to a PIC, using the
ADXL202 as an example.

The ADXL202 is available in DIP and SMD, and if you go through the AD
website, you can easily get two as free samples, so the bank account
certainly will not be drained.

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2003\06\20@125541 by Joel Middleton

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Thanks for the info Alan, I will check it out.

--- "Alan B. Pearce" <EraseMEA.B.Pearcespam_OUTspamTakeThisOuTRL.AC.UK> wrote:
{Quote hidden}

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2003\06\20@142827 by Joel Middleton

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Sorry about the previous post accidentally hit send. I
have been looking on the analog page for free samples
and I cannot find a dip version of the ADXL202. Am I
looking in the wrong place?

http://www.analog.com/Analog_Root/productPage/productHome/0%2C2121%2CADXL202%2C00.html



>I am looking for an inclinometer that I can interface
>with a PIC, preferrably in a package that would be
>easy to work with and won't drain my bank account to
>purchase. Anyone have any suggestions or is this a
>pipe dream?


You can build an inclinometer using an ADXL202. Use
the pulse width
modulated outputs into the CCP module to get the PIC
to measure it. Mount
the ADXL202 so the 2 sensors axes at 45 degrees to
horizontal at 0 incline.
Now a little maths will calculate the angle of
incline. Analog devices have
an application note on interfacing the ADXL series to
a PIC, using the
ADXL202 as an example.


The ADXL202 is available in DIP and SMD, and if you go
through the AD
website, you can easily get two as free samples, so
the bank account
certainly will not be drained.

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SBC Yahoo! DSL - Now only $29.95 per month!
http://sbc.yahoo.com

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2003\06\20@211803 by Joel Middleton

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I was unable to find a ADXL202 in a dip package on the
analog site so I guess I won't be getting a free
sample. Anyone know where I can get one of these or
something similar?

Thanks

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2003\06\20@233735 by Alex Kilpatrick

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>
>
> I was unable to find a ADXL202 in a dip package on the
> analog site so I guess I won't be getting a free
> sample. Anyone know where I can get one of these or
> something similar?
>
> Thanks
>
This is similar, but is $25.

http://www.parallax.com/detail.asp?product_id=28017

Alex

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2003\06\22@184302 by Tony Nixon

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Joel Middleton wrote:
{Quote hidden}

I've got an inclinometer project I can email you. It uses a 16F84 and an
ADXL05

The ASM code is sketchy because I lost the original source code (and a
few others) after swapping to a new PC. It is just a disassembled HEX
file.

regards

Tony

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2003\06\24@164056 by Roger Froud

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I don't know what accuracy you are looking for but I made one which is
intended for a model submarine yet to be built. Mine uses a fridge
magnet which is conveniently polarised N/S/N/S in the 4 quadrants. This
means you only need a linear Hall Effect sensor to look at the face of
it. In my design, I hold the magnet in a brass bob-weight such that the
centre of rotation of the weight coincides with the centre of the
magnet. It's about as simple as it gets and is surprisingly sensitive
(say 5mm in 1 meter whatever that works out to be) The sensitivity is
more a function of the free movement of the mechanism than the
electronics. Hope this helps.
Roger

{Original Message removed}

2003\06\24@173314 by Bob Axtell

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An engineer friend rigged one to test the amount of roll & pitch on his
sailboat. He used two pots, one mounted for port and starboard movement,
one for fore and aft movement. Just attached a weight to the knobs. He then
captured the values in a data logger. Cost about $10 US for everything,
plus the electronics (one PIC w/uart).

--Bob


At 09:40 PM 6/24/2003 +0100, you wrote:
{Quote hidden}

>{Original Message removed}

2003\06\25@005200 by Robert Ussery

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Only problem with these types is that they do not necessarily indicate angle
with the earth. In an aircraft in a perfectly coordinated turn, the relative
gravitational pull will be toward the floor of the aircraft, not necessarily
toward the earth. These types of inclinometers are great for relatively
static situations, but only an accelerometer-based inclinometer will work in
more dynamic situations...

- Robert

----- Original Message -----
From: "Bob Axtell" <RemoveMEcr_axtellspamTakeThisOuTYAHOO.COM>
To: <PICLISTEraseMEspam.....mitvma.mit.edu>
Sent: Tuesday, June 24, 2003 3:32 PM
Subject: Re: [PICLIST] [PIC]: Inclinometer


> An engineer friend rigged one to test the amount of roll & pitch on his
> sailboat. He used two pots, one mounted for port and starboard movement,
> one for fore and aft movement. Just attached a weight to the knobs. He
then
{Quote hidden}

> >{Original Message removed}

2003\06\25@134253 by M. Adam Davis

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These are accelerometer based in a sense.  If you had all three axis
covered (they would have to be spring loaded) then you could as easily
deal with a banking aircraft as you could with any other 3 axis
accelerometer.  In other words, current accelerometers do not indicate
angle with the earth either.

Current accelerometers are simply micromachined wieghts on poles.
Having a large version is no different, though all of the methods
described so far do not include any sort of spring or resistance to
movement, whereas the micromachine versions are long and thin struts
that bend but do not actually swivel or rotate.

A gyroscope, however, if calibrated from the earth with indicate angel
with respect to the earth if the output is integrated over time (or, in
the case of a mechanical and many other types the output is relative to
the earth and needs no integration)

-Adam

Robert Ussery wrote:

{Quote hidden}

>>>{Original Message removed}

2003\06\25@142624 by Robert Ussery

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----- Original Message -----
From: "M. Adam Davis" <RemoveMEadampicspam_OUTspamKILLspamUBASICS.COM>
To: <RemoveMEPICLISTTakeThisOuTspamspammitvma.mit.edu>
Sent: Wednesday, June 25, 2003 11:41 AM
Subject: Re: [PICLIST] [PIC]: Inclinometer


> These are accelerometer based in a sense.  If you had all three axis
> covered (they would have to be spring loaded) then you could as easily
> deal with a banking aircraft as you could with any other 3 axis
> accelerometer.  In other words, current accelerometers do not indicate
> angle with the earth either.

Sorry I was a little murky (late night, been traveling all day)...
Actually, what I meant to say was that you can use accelerometers as rate
gyros to keep track of where level is... i.e. zero them when you're parallel
to the ground and keep track of how much you drift away from level according
to how long an axial acceleration continues. Not terribly accurate due to
accelerometer drift and calculation errors, but generally good enough, as
long as the craft returns to level once in a while and the accelerometers
can be zeroed again to eliminate cumulative errors. This system also works
best with fairly rapid accelerations (around whatever axis tilt is being
measured on) because many accelerometers can't sense very minute
accelerations. With a really complex system of sensitive and large scale
redundant gyros, I guess really good accuracy could be attained.

- Robert

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2003\06\27@031643 by Peter L. Peres

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> These are accelerometer based in a sense.  If you had all three axis
> covered (they would have to be spring loaded) then you could as easily
> deal with a banking aircraft as you could with any other 3 axis
> accelerometer.  In other words, current accelerometers do not indicate
> angle with the earth either.

A 3-axis acc. will indicate vertical if it runs an algoruthm that
calculates the magnitude of the g vector. When g is off nominal g by 0.5%
or more then the readout goes invalid. This indicates vertical to 0.3
degrees or so.

Peter

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