NXT Robotics Lab
The purpose of this lab was to understand how the VI measures the distance the wheels travel, and the speed at which the car travels. We also recorded the distance travelled with a ruler and calculated the percentage of error.
With a ruler measure the diameter of the wheel and compute the circumference of the wheel in meters.
Circumference = p*diameter
= .175
How are the degrees that the wheel rotated related to the number of turns of the wheel? Each wheel rotation in turns is equal to 360 degrees.
How are seconds related to milliseconds? 1 second equals .0001 milliseconds.
How is the distance related to the number of turns? Distance = circumference * # of wheel turns
We ran three tests with the same time for the wheels to turn. The first test we ran at 75% power level, the second test we ran at 50% power level, and 25% for the third test. The discrepancy can be attributed to the fact that our measurements with the ruler were not exact. In contrast, the computer measurements were much more accurate, and the comparison between these two measurements accounts for the percentage of error.
To calculate % error:
| distance of ruler – distance computer | / Average (distance computer and distance ruler)
Tests 1,2, and 3
| Time | Power Level | Rotation in degrees | # of Wheel Turns | Distance Ruler | Distance Computer | Velocity | % Error |
| 1 sec. | 75% | 988 | 2.7444 | .43 m | .4802 m | .4802 m/s | 10.98% |
| 1 sec. | 50% | 589 | 1.6361 | .28 m | .2863 m | .2863 m/s | 2.2% |
| 1 sec. | 25% | 227 | .6305 | .115 m | .1103 | .1103 m/s | 41% |
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