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13. Build the following STOP procedure:
14. Change the main program and the main procedure to the following:
We added another variable that relates to the front wall sensor.
In every cycle, the main procedure checks the distance from the wall and
calls the STOP procedure when the SENSE is close to the wall.
15. Put the SENSE near the black line.
16. Run and check the SENSE movement.
17. Put your hand in front of the SENSE, while it moves.
Instead of stopping, the SENSE just slows down.
Think why.
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