Navigate and Avoid Obstacles

An interesting thing about these IR detectors is that their outputs are just like the whiskers. When no object is detected, the output is high; when an object is detected, the output is low. You could modify the project roaming_with_whiskers so that it works with the IR detectors with just a few changes. Here are the steps it takes:

• Go to the project roaming_with_whiskers and duplicate it or just rename it as roaming_with_IR.
• Replace the read digital blocks with ir detect blocks:

• Change all the variables in the if statement from whisker_left and whisker_right to irL and irR.

Example project: roaming_with_ir

• After modifying your project as described above, double-check that it matches roaming_with_ir below.
• Flash the project to your micro:bit module.
• Disconnect the cyber:bot from its programming cable and place it where it can roam and avoid obstacles.
• Set the power switch to position 2.
• Watch your cyber:bot roam. It should behave like roaming_with_whiskers, aside from the fact that it doesn’t actually run into objects before changing direction.