What Is the Best Sensor for Measuring Arm Movement in Basketball?

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Discussion Overview

The discussion revolves around selecting the best sensor for measuring arm movement specifically in the context of shooting a basketball. Participants explore various sensor options, including angle sensors, gyroscopes, accelerometers, and optical encoders, while considering their accuracy, cost, and practicality for a senior design project.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant inquires about the KMA 199/200 sensor and its measurement capabilities for arm motion.
  • Another suggests using an optical encoder for accurate angle measurements, noting its potential for non-contact applications.
  • A different participant proposes a combination of a gyroscope and an accelerometer as a viable solution.
  • Questions are raised regarding the required angular accuracy and response time, as well as budget constraints.
  • One participant outlines a goal for the project, which includes displaying the strength applied to the basketball and the angle of the hand on an LCD worn by the player.
  • Another participant mentions the challenges of using accelerometers due to their sensitivity to other accelerations and suggests that while gyros may be better, they could be expensive and difficult to fit on the hand.

Areas of Agreement / Disagreement

Participants express various viewpoints on the effectiveness of different sensors, indicating that multiple competing views remain without a consensus on the best approach.

Contextual Notes

Participants have not settled on specific requirements such as the necessary angular accuracy or budget limitations, which may influence the choice of sensor.

Who May Find This Useful

Individuals interested in sensor technology for motion tracking, particularly in sports applications, may find this discussion relevant.

maigo.liu
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Hi Guys,

I have an question about angle sensing/sensor.

The KMA 199/200 Sensor:
http://www.digikey.com/sg/en/ph/NXP/kma.html?WT.z_Tab_Cat=Featured%2520Products

I read the data sheet, but I am still not 100% sure what this sensor is measuring.

I am doing a senior design project, and I need to measure the motion of the arm when shooting a basketball.

The other way I can think of is using a gyro sensor to measure the angular velocity and use the microcontroller to do an integral to find out the angle.

If you can think of any other way, PLEASE LET ME KNOW!

PLEASE HELP ME.

Tanks A LOT!
 
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Have you thought about using an optical encoder? I believe they can yield quite accurate angle measurements and could be 'non-contact'.
 
Maybe also a system with a gyroscope and an accelerometer would work fine.
 
What angular accuracy do you need and how fast do you want the answer (i.e. could you analyse pictures, later)?
Also, how much money do you have to spend?
 
Our goal is : after the motion of shooting the basketball, the player can check on a LCD display which he or she wears on the arm for the strength he or she applied to the basketball and the angle of his hand (maybe put the gyro on the back of the palm).
 
accelerometers?
 
There's a much simpler, and cheap, method you could use. The problem with the accelerometer is that it will be measuring lots of other accerations during the movement, not just the angle of the hand. A gyro might be better, but is expensive and fitting it to the hand might be a challenge. Is this a commercial project you are working on?
 

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