I am trying to make a vibrating speedometer (wristband ) for the skier's wrist for my project. Do I need to use an accelerometer or GPS to understand the skier's speed for this wristband ? ( downhill skiing)
GPS would work. An accelerometer will not.
GPS would be better but I'm not sure how often the position & speed gets updated. It should give a pretty-good average speed, but not the kind of accuracy you need in timed competition (to determine a winner, etc.).
The problem with an accelerometer is that you can't get accurate readings when the acceleration is near zero (when the speed is constant or nearly-constant). "Small readings" are sensitive to noise and uncertainty.
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How accurate and how often do the readings need to be?
How will you determine the person is NOT moving when waving their arm to get attention?
How is dead reckoning done for robots?
I think I can measure the speed of the skier when user starts sliding down
Apple has a speedometer app for their phone... I thought this app got eliminated after a few KOM failures. It's back. Is the skier going to feel the vibration, and so, will the reaction be good?
According to my project, users will feel the vibration. There will be a vibration and design at a level of intensity that they can feel. My design will be more like a warning system rather than a mobile speedometer application
Then explain where the speed sensor is located. I though you were putting it on a wrist band.
That's true. The system will be integrated within the wristband, including GPS functionality. Users will utilize this wristband as a warning device. What I mean is that it will be different from a typical mobile application
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