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A TT geek realizes that smart phones now have accelerometers built in and downloads an accelerometer app. The the TT geek swings his smart phone like he is looping a ball and records the acceleration in 3 axes X, Y and Z.
What the TT geek discovered is that one can swing the phone much faster than than the phone can record. The accelerometers on a smart phone only seem to be able to go up to 8g or 8 times gravity. This TT geek did some math and determined that the peak acceleration can't be much more than that. The TT geek did another swing but just a little slower an got some valid data. The problem with smart phone acceleratomers is that they up date at semi random intervals from 7 to 15 milliseconds. This is pretty good if you just want to see how fast you swing but not good enough if you want to see how the impact of the ball changes the acceleration of the paddle.
This TT geek figure that an accelerometer that can record as high as 16g is high enough but the sample or update rate must be MUCH higher like 4Khz to 10KHz. If the accelerometers where sampled at 10KHz then the impact of the ball can be detected.
Now the TT geek is looking to see if he can design an accelerometer and circuitry that would weigh about 40 to 45 grams so it can be mounted on the back side of the paddle. One of the tricks is getting the data out of the accelerometer and back to a PC or laptop.
Just geekin' out. Sometimes I can't help myself.
What the TT geek discovered is that one can swing the phone much faster than than the phone can record. The accelerometers on a smart phone only seem to be able to go up to 8g or 8 times gravity. This TT geek did some math and determined that the peak acceleration can't be much more than that. The TT geek did another swing but just a little slower an got some valid data. The problem with smart phone acceleratomers is that they up date at semi random intervals from 7 to 15 milliseconds. This is pretty good if you just want to see how fast you swing but not good enough if you want to see how the impact of the ball changes the acceleration of the paddle.
This TT geek figure that an accelerometer that can record as high as 16g is high enough but the sample or update rate must be MUCH higher like 4Khz to 10KHz. If the accelerometers where sampled at 10KHz then the impact of the ball can be detected.
Now the TT geek is looking to see if he can design an accelerometer and circuitry that would weigh about 40 to 45 grams so it can be mounted on the back side of the paddle. One of the tricks is getting the data out of the accelerometer and back to a PC or laptop.
Just geekin' out. Sometimes I can't help myself.
