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Lego Etch-A-Sketch. Alma College – Lego Mindstorm Workshop – June 2005. Authors. Cathy Bareiss – Olivet Nazarene University Gary Locklair – Concordia University, Wisconsin Cate Sheller – Kirkwood Community College. Target Audience. Characteristics Jr. High student through CS0
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Lego Etch-A-Sketch Alma College – Lego Mindstorm Workshop – June 2005
Authors • Cathy Bareiss – Olivet Nazarene University • Gary Locklair – Concordia University, Wisconsin • Cate Sheller – Kirkwood Community College
Target Audience • Characteristics • Jr. High student through CS0 • Min. programming • via data files and simple drivers • Stationary brick • Worm gears • Geometry • IRX control of robot
Overview • Students will build a Lego Etch-A-Sketch robot and write simple programs via use of data points to use it to draw. • With this exercise students will learn to use geometry in the real world. They will also understand the importance of sequencing of commands and the need to plan first.
Problem • In Bareiss-Land a recent law was passed that all toys must be powered by electricity. Ambassador O’Horvath wants to import Etch-A-Sketchs to help her country’s economy. You have been hired to do the marketing of the new Lego Etch-A-Sketch. You must develop some prototypes to use in the marketing
Tasks • build robot (with instructions) • build data file to draw simple figures (i.e. square, triangle) • data file with more complex figures (polygons, ciricles?) • provide code to get a number from either touch sensors or buttons • have them adapt code to read from input (above) instead of data file for list of points
Proof of Concept • Prototype of robot
Things to be “supplied” • Program that can go certain lengths • Via time or rotation sensors • Instructions for building robot • Need guides to control “rods” • Need device to hold pen (possibly a rubber band) • Need to provide code for inputting number pairs via buttons (or touch sensors – need to adapt robot)
Different Levels • Simple level • Provide all code – require students to develop only the points • Intermediate level • Adapt code to take numbers read from buttons and develop appropriate driver • Advanced level • Adapt code to work with length and angles
Additional tasks • Use geometry to compute points for certain angles/figures/etc • Study accuracy • Develop a marketing plan • Adapt program to take angle and length • Build electric rule