9. Case 07: Fall-arrest Cutebot

9.1. Purpose

  • The Cutebot reverses quickly when detecting the edge of a table and goes forward after making a turn.

9.2. Materials

9.3. Software Platform

MicroSoft makecode

9.4. Programming

Step 1

  • Click the “Advanced” to see more choices in the MakeCode drawer.

../../_images/cutebot-pk-1.png

  • A codebase is required for Cutebot programming, click “Add Package” at the bottom of the drawer, search Cutebot in the dialogue box and download it.

../../_images/cutebot-pk-11.png

Note: If you met a tip indicating incompatibility of the codebase, you can continue with the tips or build a new project there.

Step 2

  • Choose “show icon” in the On start brick.

../../_images/case_07_011.png

Step 3

  • Drag if brick into forever brick and judge if both of the line-tracking sensors are detecting the edges of the black line, then set the right wheel speed to 20.

  • If not, set the speed of both wheels as -50 to reverse, pause 300ms and keep the left wheel still but the right wheel moves at a random speed from 50~100 and lasts 100ms.

  • Set the speed of both wheels to 0 and pause 1s to move forward again.

../../_images/case_07_021.png

Programming

Links: https://makecode.microbit.org/_LvweWCb3J72u

You can also download it directly below:

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9.5. Result

  • The Cutebot reverses quickly when detecting the edge of a table and goes forward after making a turn.

9.6. Exploration

9.7. FAQ

9.8. Relevant Files