1. Echo locator

    Echo locator

    How could you build a device that uses sound to indicate the distance to the nearest object? For example, as an aid for a person with vision impairment. Other than using the Ultrasound Sensor, are there any other sensors that could be used to measure distance? Resources Echo...

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  2. Dancing robot

    Dancing robot

    Design, construct and program a dancing robot that has at least two moving parts and at most two motors. Set your robot’s dance to music. Resources Dancing Robot lesson plan – ROBOLAB + NXT-G (PDF)  

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  3. Find the hidden letter

    Find the hidden letter

    In this activity, use a robot equipped with a light sensor to determine the hidden letter message (under a table or in another room). The letter will be determined using light sensor collected data on 3 passes over of the letter.      Resources Find the Hidden Letter...

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  4. How to write efficient NXT-G programs

    How to write efficient NXT-G programs

    Writing Efficient NXT-G Programs (PDF) describes how to make your NXT-G programs as efficient as possible to create complex behaviours with a minimum of memory. These techniques are particularly relevant for competitions such as FIRST LEGO League (FLL) and RoboCup Junior, in which competitors often download several complex...

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  5. The stubborn car

    The stubborn car

    Think of a way to design and construct the stubborn car: a car that will always return to its original place no matter how far it is rolled away from its starting point. Tip: How can you track the rotary motion of the car’s wheels? This challenge provides...

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  6. Relay race

    Relay race

    Design and construct a team, comprising of  three cars, to compete in a relay race. Only one car may move at a time. Hint: Is there a way to send messages between team mates?  Resources Relay Race lesson plan – ROBOLAB + RCX (PDF)    

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  7. Ultrasonic touch guitar

    Ultrasonic touch guitar

    The idea of this radical challenge is to use the ultrasonic sensor, touch sensors, and buttons on the NXT to create a guitar. The ultrasonic sensor can control the pitch of the note based on the location of the user’s hand, and the touch sensors can control other...

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