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Challenge 6

In this final challenge students will design a maze navigation alorythm.

Success Criteria

  1. My Robot navigates the whole maze by moving over all tiles without colliding with any walls

Before You Begin

  1. Complete Blockly Levels 10 to apply the algorithm visually.
  2. Review all your solutions to challenges 1-5 as these code snippets are the building blocks for this challenge.

How to Approach the Basic Obstacle Avoidance Challenge

1. Understand the Goal

The aim is to make your robot move forward, detect obstacles using the ultrasonic sensor, and automatically avoid them by stopping and turning before continuing forward. This is a key skill for building autonomous robots.

2. Break Down the Problem

Think about the steps your robot needs to take:

  • Move forward.
  • Continuously check the distance to any object in front.
  • If an object is detected within a certain range (e.g., 300mm), stop.
  • Turn away from the obstacle (left or right).
  • Continue moving forward.

3. Plan Your Algorithm

Draw a flowchart or write out the steps in plain language. For example:

  • Start the robot.
  • While running:
    • Measure the distance ahead.
    • If the path is clear, keep moving forward.
    • If something is too close, stop and turn.
    • After turning, move forward again.

4. Write the Code in Small Steps

Start by making your robot move forward and print the distance readings. Once you’re comfortable with that, add the stopping and turning logic.

Example Steps:

  • Step 1: Make the robot drive forward and print the distance.
  • Step 2: Add an if statement to check if the distance is less than 300mm.
  • Step 3: If it is, stop the robot and make it turn.
  • Step 4: After turning, continue moving forward.

5. Test and Adjust

  • Place obstacles in front of your robot and see how it reacts.
  • Adjust the distance threshold (e.g., try 200mm or 400mm) to see what works best.
  • Change the turning direction or how long the robot turns to improve its avoidance.

6. Reflect and Extend

  • Try making the robot turn randomly left or right.
  • Experiment with different speeds or add sounds/lights when an obstacle is detected.
  • Think about how this logic could be used in real-world robots (like vacuum cleaners or delivery robots).

Tip: Take it one step at a time. Test your code after each change so you can quickly spot and fix any problems.

If you see error messages while building your maze code, check Common_Errors.md.

Step 4 Save Your Code

  1. Copy all your code from main.py.
  2. Paste it in your portfolio under "Challenge 5".