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    Avoid obstacles

    For Form 3–5, college · 3 lessons · 60 min in total

    Start the first lesson
    1. 1 Measure distance with sound Read an ultrasonic sensor in centimetres. 15 min Coming soon
    2. 2 Stop before you hit Stop at a safe distance, every time. 20 min Coming soon
    3. 3 Find a way around Plan a simple detour and rejoin the line. 25 min Coming soon