pxt-ev3/docs/design-engineering/make-it-smarter.md

Make It Smarter and Faster

Connect

Design Brief

Design, build and program a robotic creature that can sense its environment and respond by moving.

https://www.youtube.com/watch?v=y9-A_C_08KY

• What do the robots in the video need to be able to sense, plan, and act?
• What senses do humans have and why are they important to us?
• How many human-like senses do you see the robots demonstrating?

Brainstorm

Discuss different solutions to the design brief.

Think about:

• What kind of creature can it be?
• How can it move?
• What does it need to be aware so that it stays safe, well fed and warm (or cool)?
• Is it looking for food, a safe place to hide or a warm place to soak up the sun?
• Will the creature need to move fast or slow?
• Will it need to turn?
• Will it need to go backward?

Construct

Build

Think about a creature’s movement for inspiration. Your mechanism can be attached or unattached to the EV3 brick. You can start by tinkering with the LEGO elements in the picture add then build on. More building ideas:

• EV3 Frames
• Color Sensor 1
• Gyro Sensor
• Ultrasonic Sensor
• Touch Sensor
• Jaw
• Leg 1
• Leg 2
• Leg 3

Program

Before you program, think about:

• How will you program the robot to sense?
• How will you program the robot to respond?
• Which programming blocks will you use?

~ hint

Hint: Explore the different Sensor blocks in the Sensors Menu

~

SCREEN 5

Sample Solution

[Video: EV3 Insect]

This Insect uses its Ultrasonic Sensor to sense danger and move away from threat.

The Insect solution combines these building ideas:

• EV3 Frames
• Leg 2
• Leg 3
• Ultrasonic Sensor

Four copies of Leg 3 were built: one for the front left, one for the back right, and two mirror copies for the front right and back left.

• Building Instructions

Sample Solution

This program checks if the Ultrasonic Sensor senses something near.

This program:

• Turns on the green EV3 brick Status Light

brick.setStatusLight(StatusLight.Green)

• Waits for Ultrasonic Sensor to detect an object

sensors.ultrasonic4.pauseUntil(UltrasonicSensorEvent.ObjectDetected)

• Turns on Motors A and D in opposite directions

motors.largeAD.tank(50, -50)

• Waits for one half of a second (1500 milli seconds)

pause(1500)

• Reverses the direction of Motors A and D

motors.largeAD.tank(-50, 50)

• Waits for one half of a second
• Stops all motors

motors.stopAll()

• Makes an insect chirping sound

music.playSoundEffectUntilDone(sounds.animalsInsectChirp)

• Loops so the insect wanders around when the Ultrasonic Sensor is triggered

forever(function () {
    brick.setStatusLight(StatusLight.Green)
    sensors.ultrasonic4.pauseUntil(UltrasonicSensorEvent.ObjectDetected)
    motors.largeAD.tank(50, -50)
    pause(1500)
    motors.largeAD.tank(-50, 50)
    pause(1500)
    motors.stopAll()
    music.playSoundEffectUntilDone(sounds.animalsInsectChirp)
})

Download and test

Click Download and follow the instructions to get your code onto your EV3 Brick. Press the center button on the EV3 Brick to run the program.

Contemplate

Test and Analyze

As you work on your solution:

1. Describe one part of your design that worked especially well.
2. Describe one design change that you had to make.
3. What will you try next?

Review and Revise

Take a moment to reflect on your robot solution.

Think about:

• Does your robot move when the sensor is activated?
• If not, what will you change to make the robot’s ability to sense and respond more obvious?
• What other behaviors can you add to the robot to make it more realistic?

Describe two ways you could improve your robot.

Continue

Personalize your project

• Add/remove LEGO elements to improve the way your robot moves.
• Click on the JavaScript tab and experiment with changing the values in the code.
• Add a custom image or sounds by adding blocks from the Brick or Music menus.
• Does your robot resemble a creature? Add arts and crafts materials to you project.

Communicate

Here are some ideas:

• Create a video of your project, especially your final presentation and your robot’s performance. Explain some important features of your software program.
• Produce a building guide for your model by taking a series of photographs as you deconstruct it.
• Include an image of your program with comments.
• Add a team photograph!

Congratulations! What will you design next?