adxl103 accelerometer as tilt sensor
adxl103 accelerometer as tilt sensor
(OP)
I was wondering if anyone has any experience with the adxl103 analog devices accelerometer. I am trying to obtain a sensor capable of measuring angles in an underwater robotic craft. I need single axis rotation measurement, and understand that this is a reasonable low cost sensor.
My problem is that I will be integrating using a digital system with data points every 100 ms or so, and am worried about obtaining a reasonably clean signal. Do you think that this is possible with this sensor and these conditions?
Also, the adxl103 measures "single axis" acceleration. Does this mean that is only measures acceleration in one LINEAR direction. If so, I could easily calculate angle using this, but will the tilt of the sensor cause errors.
Anyway, if anyone has any information or experience or any input whatsoever, it would be greatly appreciated.
Thanks.
My problem is that I will be integrating using a digital system with data points every 100 ms or so, and am worried about obtaining a reasonably clean signal. Do you think that this is possible with this sensor and these conditions?
Also, the adxl103 measures "single axis" acceleration. Does this mean that is only measures acceleration in one LINEAR direction. If so, I could easily calculate angle using this, but will the tilt of the sensor cause errors.
Anyway, if anyone has any information or experience or any input whatsoever, it would be greatly appreciated.
Thanks.





RE: adxl103 accelerometer as tilt sensor
What you are proposing should not be a problem with that device. I wouldn't hesitate to give it a go.
What might be a problem is soldering it. This is a small part with 0.025" pads this is non-trivial land!!
You will be laying out a board for this correct?
RE: adxl103 accelerometer as tilt sensor
TTFN
RE: adxl103 accelerometer as tilt sensor
The gravity vector poynting at China! As the device tilts the force diminishes. With a single axis it is harder! With two axis you can do it easier. With the single, you have to essentially tell it "you are now level" then through your actions, deduce which way you are rotating. Counter motions that you command can confirm measured rotations. I'd prolly use a two axis.
RE: adxl103 accelerometer as tilt sensor
Do some analog pre-filtering to, say, 2.5 Hz to minimize alising-sampling at 10/sec limits the bandwidth to 5 Hz.
RE: adxl103 accelerometer as tilt sensor
RE: adxl103 accelerometer as tilt sensor
http://www
I would imagine that an underwater craft would need a 3 axis (axes?) accelerometer to help determine it's orientation and rotation in any plane.
I have one on my desk but haven't had a chance to play with it yet.
regards
Pete
(TurboXS)
RE: adxl103 accelerometer as tilt sensor
http://www.microstrain.com/3dm-gx1.aspx
RE: adxl103 accelerometer as tilt sensor
RE: adxl103 accelerometer as tilt sensor
$30 in 1000's {not to mention unavailable until this Friday which really means 3 months from now.} :(
RE: adxl103 accelerometer as tilt sensor
Before MEMS accelerometers could be used for tilt sensors, clinometers were (and still are) in the hundreds of dollars.
This gyro is very popular in products like video cameras, for image stabilization, and in cars. It isn't a brand new product, it is in production, but the demand is high. I designed it into a guidance system and it works fine.
RE: adxl103 accelerometer as tilt sensor
Can I ask what kind of vehicle did you design the guidance system into?
RE: adxl103 accelerometer as tilt sensor
It went into a tractor.
RE: adxl103 accelerometer as tilt sensor
RE: adxl103 accelerometer as tilt sensor
You could use a 3 axis accelerometer to determine orientation in 3d space but that is all you can do. There are 6 degrees of freedom associated with finding out WHERE the accelerometer is (translation about 3 axes), as well as its orientation (rotation about 3 axes). Now the question is, how many 3 axis accelerometers would you need to determine both?
How many 1 axis accelerometers would you need?
One solution that a company markets is based on an array of 9 one-axis accelerometers, and this device they sell is placed in the cockpit of a plane. It is used for determining when the parachute should open up for a fighter pilot that has bailed out. With the spinning and fast movements that go along with bailing out, accelerometers are very important for making sure the parachute doesnt pop open when a pilot is upside down.
Jim Goebel,
Electrical Engineer
Mid-West Forensics, Inc.
RE: adxl103 accelerometer as tilt sensor
if designing with x-axis only mem then can the
design get accurate tilt response from say the 0 degree
angle without getting a mirrored response from 180 degree angle?
Or is dual axis the only way to go when calculating tilt?
RE: adxl103 accelerometer as tilt sensor