12. Case 09: Autonomous Obstacle Avoidance#

12.1. Purpose#

  • The Cutebot avoids the obstacles automatically to move forward.

12.2. Materials#

12.3. Software Platform#

MicroSoft makecode

12.4. Programming#

Step 1#

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

../../_images/cutebot-pk-13.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-111.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#

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

../../_images/case_09_011.png

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.

../../_images/case_09_02.png

Programming#

Links: https://makecode.microbit.org/_h0KKu8aR5hgW

You can also download it directly below:

12.5. Result#

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

12.6. Exploration#

  • Why should the detected value be over 2cm ?

12.7. 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.

12.8. Relevant Files#