11. Case 09: Autonomous Obstacle Avoidance

11.1. Purpose

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• The Cutebot avoids the obstacles automatically to move forward.

11.2. Materials

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• 1 x Cutebot Kit

• 1 x Ultrasonic Sensor

11.3. Software Platform

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MicroSoft makecode

11.4. Programming

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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/_hijb4L6ttgfc

You can also download it directly below:

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11.5. Result

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

11.6. Exploration

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• Why should the detected value be over 2cm ?

11.7. FAQ

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11.8. Relevant Files

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