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Percentage of Errorin Wheels and Distance
• In the original lesson we learned that a robot should move
forward a specific distance for each rotation.
• That distance traveled is equivalent to the circumference of the
wheel multiplied by the number of rotations.
• 360° = 1 full rotation of a wheel
• We created a standard formula that works regardless of the size
of the wheel.
ceDisDesired
XNecessaryDegrees
nceCircumferesWheel tan_
)(_
_'
360
• We are going to use this formula to test the accuracy of our programming.• Using the properties of proportions we cross multiply to solve for X°.
mferenceWheelCircuXceDesiredDis tan360
XmferenceWheelCircu
ceDesiredDis tan360
• We divide both sides of the equation to isolate and solve for X.
Keep It Simple
Create a program for your robot to travel 30 cm, for each of the three wheel sizes to be tested.
Wheel SizePredicted Motor
Degrees
Actual Distance
Traveled (cm)
Average of Actual
Distance (cm)
• Run your program three times for each wheel size.• Record your data in the following table (as on your worksheet).
% of Error = 100tanPr
tantanPr
ceedictedDis
ceualDisAverageActceedictedDis
• Using the data from the worksheet, we shall calculate the effectiveness of our programming.
Size of Wheel Percent of Error
• If your percent of error is equal to or less than 5% this is an accurate and efficient program.