Introduction:
In the second experiment that we have to accomplish is to measure distance and velocity using our Leggo robot. So we have to measure how long the car traveled, both with a ruler and through Labview. Then use both results to compute the percent error for 3 of the trials that we performed.
Procedure:
Measuring distance and velocity
1. We launch the VI wheel_rotation_straight.vi
2. We study (with the instructor) the VI to understand how it works to measure the distance the wheels travel, and the speed at which the car travels.
3. With a ruler we measure the diameter of the wheel and compute the circumference of the wheel in meters (circumference= p*diameter).
4. We run the VI and record:
Experiment:
By measurement
| Power distance | Time distance | |||
|
75 Power/75 Power |
23meter |
1 Second. |
7meter |
|
|
100 Power/100 Power |
32meter |
2 Second. |
14.5meter |
|
|
50 Power/50Power |
15meter |
4 Second |
30.75meter |
|
Through Labview
| Power | distance | Velocity | Time | distance | Velocity | |
| 75 Power/75 Power | 40.1meter | 20m/s | 1 Second. | 13.3m | 13.3m/s | |
| 100 Power/100 Power | 56.9meter | 28.5m/s | 2 Second. | 26.6m | 13.39m/s | |
| 50 Power/50Power | 26.4meter | 13.2m/s | 4 Second | 51.6m | 12.9m/s | |
So now I have to calculate the percent error. First I averaged all the distance measured and collected through labview and then use the formula above to find the Error.
The Percent in error for Power = 89.2%
The Percent in error for timer = 67.4%
So the percent in power is closer than time as we can see, but the reason is that for the time experiment we used just a couple of seconds with has a big effect on the distance we recorded. So if we would have increased the time, our results would be closer t 100%.
This second lab was easy and fun. we finished the experiment early and we are looking forward to use our robots for even more difficult challenges ahead.Measuring distance and velocity