Looking for motion tracking sensor/ sensitivity sensor

[sli3]

Hi, everyone.
I am about to start my firdt project with my pi3, but my project is required sensor that be able to track motion or some kind of sensitive sensor that able to stick on human skin and measure the movement and sensitivity of movement. i have been looking but no luck, just wonder of anyone have dine any project that involved anything similarly to mine and would like to share some knowledge.

Really appreciate any answers in advance.

[OutoftheBOTS]

If you r juts looking to be able to detect any movement than that is easy using a camera and computer vision.

If want to only track movement of a human than that is harder but there is a few way of doing it.

Please give us a bit more details on what your trying to achieve

[sli3]

Hi, thanks so much for reply

If you r juts looking to be able to detect any movement than that is easy using a camera and computer vision.

If want to only track movement of a human than that is harder but there is a few way of doing it.

Please give us a bit more details on what your trying to achieve

Hi, Thanks so much for reply, the sensor that I'm looking for is that I'm able to stick on skin (eg. arm for example) then something (or someone) touch it, it will give me the feedback of how strong of the force that( this can display by led light or some led display).

Hope it's enough information.

Thanks again for your help. (and sorry for bad English =( )

[PiGraham]

Do you want to track the position of people in an area, or do you want a touch sensor that measures where a finger touches and how it moves over the sensor?
It seems you want to stick a touch sensor to an arm and read the motion of a finger that touches that sensor. Is that right?

If so you may be able to use a touchscreen overlay that might be used on a small LCD display screen. Attach that to rigid backing plate and put that on your arm. Wherever you touch the overlay will read like a mouse click at an x,y position, or as a touch event.

Note that touch overlays are usually flexible on their own. It should curve around a gauntlet or bracer.

[OutoftheBOTS]

Ok your not after tracking but rather a force sensor.

There is a number of these type of sensors around and it is a case of finding the right 1 for your application.

I assume that your looking for something that works similar to a resistive touch screen or a load cell type sometimes called strain gauge.

A quick google I found this but no idea if it will do what you want https://www.aliexpress.com/item/Free-Sh ... cacbd23195

[OutoftheBOTS]

Do note if you use these types of sensors you will also need a ADC (analog to digital converter) to read them as they have an analog output

[sli3]

Hi.
Excellent!!!!! so sorry I did not know how to explain it that well =\ for what Im looking for haha....

but what you suggested should be what im looking for.

there is also another sensor that im searching for. It like what they use in the movie, that you can stick on people face ( like a little dot ) then you will be able to use that to map it in 3d face model in a computer. i do not know if this will be too advance for Raspberry pi or not, but if it any type of sensor that can give me a similar results i will give it a try.

thank so much for your reply and helping me out, really appreciate.

[OutoftheBOTS]

To track the silver dots on people like on the movies is a lot more complex.

They wear black so the silver dots have good contrast for the cameras to follow. They use multiple cameras from different angles to track each silver dot. Then use computer vision to find the position of the dot within the frame and track it's movement from frame to frame then fuse all the data from all the cameras to get a 3D model of the movement.

[PiGraham]

Hi.
Excellent!!!!! so sorry I did not know how to explain it that well =\ for what Im looking for haha....

but what you suggested should be what im looking for.

there is also another sensor that im searching for. It like what they use in the movie, that you can stick on people face ( like a little dot ) then you will be able to use that to map it in 3d face model in a computer. i do not know if this will be too advance for Raspberry pi or not, but if it any type of sensor that can give me a similar results i will give it a try.

thank so much for your reply and helping me out, really appreciate.

This is a very different problem. Search for "motion capture" or "mocap".
The little dots aren't sensors, they are simple markers. They may be retroreflective domes and illuminated by IR light near the camera lens to make them stand out. There are various ways to detect such markers.

You could look at OpenCV which will run on Pi. There is a Python library for it as well. It can do thing like read imaes from a camera, detect bright spots or shapes or colours and calibrate camera views to 3D space.

I think this will be a difficult project and performance of Pi may not be adequate for high quality results. I guess you will need at least 25 fps.
Full body motion will need multiple cameras to triangulate the points abut for facial mocap one camera can give good result for some uses.

[sammya]

Hi All,

I am just starting a project and I am looking for a motion sensor. The project is related to elderly people at care homes. There are cases where people are not meant to leave their beds without assistance & I want to track them in case they get out and wander around the place.