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.