|Name of Activity||Digital Measuring Wheel|
|Keywords||NXT, rotation, sensor, measurement, accuracy, diameter, circumference, pi, distance, conversion|
|Grade Level||4, 5, 6, 7, 8, 9+|
|Time||1 Hour Total|
|Brief Description||Use an NXT and a rotation sensor to buld a digital measuring wheel. The device can be
pushed by hand on the ground or at a distance using a handle. Check the device’s
accuracy with a measuring tape.
|Lesson Objectives:||- To learn about programming in NXT MINDSTORMS.
- To use measurements and math in programming to collect data.
|Materials Needed:||NXT brick
NXT motor w/built in rotation sensor
LEGO wheel and axle
Computers running NXT-G MINSTORMS software.
USB cords to connect NXT bricks to computers
Data collection sheet
|Preparation and Set Up:||
- Arrange students in groups of two.
- Distribute necessary materials.
|Necessary Background||Measuring wheels are used in many places to find the distance of a line. The number of
rotations can be translated to distance if the circumference of the wheel is known.
The circumference can be found by measuring around a wheel or by multiplying the
diameter by pi.
|Extensions or Modifications:||Add a touch sensor to clear data to take a new measurement.
Use a touch sensor to trigger when measurements are displayed.
Add sound feedback when certain distances are reached.
Convert the device to a wench that measures the length of a string wrapped