Rotation angle measurement of pedal with ball and socket joint

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The discussion focuses on measuring the rotation angles of a pedal attached to a sedated cat's foot, requiring high precision of 0.25 degrees. Various measurement methods are proposed, including using rods and rings for angular position tracking and the potential use of coordinate measurement machines (CMMs) for accurate readings. Concerns are raised about the size and weight of devices that could hinder the foot's movement, leading to suggestions for lightweight alternatives. The purpose of the experiment is to stimulate the cat's nerve and observe the resulting foot movements in three dimensions. The conversation highlights the need for a balance between measurement accuracy and the practicality of the setup.
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  • #32
Hello guys,

I found three inclinometer sensors with the resolution and accuracy required.
the only problem is the weight, which I think can be solved if using the chip without the housing,

I wonder if you have come across these sensors so I can get your feedback.

https://www.gsglobalresources.com/products/control...

Thanks,
 
  • #33
3-axis accelerometers are used in a range of things from aircraft navigation equipment to cell phones.

Sensitivity is often shown as resolution in mG where your ±0.25° translates to 4.4mG, where G is the acceleration of Gravity at the Earths surface.

Here is a link to one source of low cost ones. The drawback is they are just the packaged sensor itself, you have to supply all the electronics to use them. Prices range from USD $1.32 to $178.55 at this distributor, there are others.
https://www.mouser.com/Sensors/Motion-Position-Sensors/Accelerometers/_/N-axgd7?P=1ynyo5tZ1y9irx0Z1ykfg8jZ1yu25cjZ1y9k2dtZ1y9gw93Z1y96oa1Z1yoi99nZ1y8pyzaZ1yyfbu4Z1yoi9b7Z1yq2rrdZ1yq2rrbZ1yzuq36Z1yvt0viZ1yzv7ytZ1yyg66sZ1y9geabZ1yrhbd5Z1yzvsot

(above found with:
https://www.google.com/search?&q=tri+axis+accelerometer+sensor)

Cheers,
Tom
 

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