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cutebot_case09.md

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Case 09: Autonomous Obstacle Avoidance

Purpose

  • The Cutebot avoids the obstacles automatically to move forward.

Materials

Software Platform

MicroSoft makecode

Programming

Step 1

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

  • 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.

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

  • Drag "go straight at full speed" brick into the On start brick.

Step 3

  • Set a Sonar variable to save the detected Cm value in the Forever brick.
  • If the detected value is between 2 and 20 which means there is obstacle being detected in the front 20cm far, set the left wheel speed to 0 and right to -50, make a right turn at a random time to complete an obstacle avoidance.
  • If not, move forward at its full speed.

Programming

Links: https://makecode.microbit.org/_TaE1uEVfvb8z

You can also download it directly below:

<iframe style="position:absolute;top:0;left:0;width:100%;height:100%;" src="https://makecode.microbit.org/#pub:https://makecode.microbit.org/_TaE1uEVfvb8z" frameborder="0" sandbox="allow-popups allow-forms allow-scripts allow-same-origin"> </iframe>

Result

  • The Cutebot moves forward at its full speed and will make a right turn to keep going if any obstacle being detected.

Exploration

  • Why should the detected value be over 2cm ?

FAQ

Q: After connecting the Sonar:bit, the Cutebot doesn't work.
A: Please have a check on the connections of the Sonar:bit, make sure that you connect to the SR04 connection rather than the IIC.

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