EducateNXT

Robot Sumo

The robot gains intelligence.

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Introducing AutonomyAutonomous behavior occurs when a robot, using its own sensors, can make a decision for itself.

The Sumo EduBots shown have light and ultrasonic sensors that allow them to make decisions.

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Where am I?The first task is for the EduBot to stay inside the dohyo when it moves.

It must know whether it is on the white middle or the black boundary – and what to do in each case.

Write down what action you want for the EduBot when it is on…

White middle

________________________________________________________________________

Black boundary

________________________________________________________________________

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Where am I? Flowchart

What reading does the light sensor see?

Drive Forward(unlimited duration)

Stop and turn around

Sees black

Sees white

Repeat

Here is the answer in the form of a flowchart.

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Where am I? Program

Here is the answer in the form of a flow chartHere is the answer in the form of a program.

With some blanks for you to work out.

Note the < sign in the Compare part of the switch configuration panel has been switched to get “sees black” on the top branch.

Mouse click to reveal blocks.

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Where are you?Using the ultrasonic sensor, the opponent can be tracked.

To attach an ultrasonic sensor, you can use the NXT Building Guide that comes with the kit.

Or better yet, try and attach your own – maybe at

the front.

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Programming the U.S. SensorFill in the behaviors

U.S. Sensor Behavior

Can detect an object within

range

Cannot detect an object within

range

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Programming the U.S. Sensor

The Flowchart

Check U.S. sensor.Is there an object in front of the robot?

?

?Yes

No

Repeat

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Programming the U.S. Sensor…and the program

May involve a

few blocks

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Two Sensors – One Program

Check light sensor

?

Check ultrasonic

sensor

?

?

Black boundary detected

Opponent found

No object detected

Sees white only

Repeat

Which sensor takes priority (goes first) – light or ultrasonic?

Programming up to you – no hints this

time!

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…and for the teacher

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A sample solution

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