| 摘要 |
The present disclosure provides a method for measuring a path length using a handheld electronic device comprising: repeatedly tumbling forward the handheld electronic device so as to cover the path to be measured; sensing a rotational change of the handheld electronic device; counting fractional increments of revolution of the handheld electronic device with respect to a starting position; and estimating the path length based on he counted fractional increments of revolution. |
