Robot 2 Lesson

Step 1 - Build Your Driving Base Robot

Build the robot driving base:

If clicking on the image above doesn’t open the instructions, right-click on the image and choose “Save link as…” to download the PDF.

Step 2 - Show an image and move

Add blocks to the ||loops:on start|| block to show an image and move the motors B+C for 1 rotation.

brick.showMood(moods.neutral)
motors.largeBC.steer(0, 50, 1, MoveUnit.Rotations)

Step 3 - Brick button

Let’s change the code so that your robot moves when the UP button is pressed. Add an ||brick:on button up|| block and move ||motors:steer motors|| inside of it. After downloading your code, press UP to move the robot.

brick.buttonUp.onEvent(ButtonEvent.Pressed, function () {
    brick.showMood(moods.awake)
    motors.largeBC.steer(0, 50, 1, MoveUnit.Rotations)
})
brick.showMood(moods.neutral)

Step 4 - Braking

When the motors are done turning, the robot keeps on moving for a short distance. Turn on the brakes so that your robot stops immediately. Drag a ||motors:set brake|| block into the ||loops:on start|| and set it to ON for the the BC motors.

brick.buttonUp.onEvent(ButtonEvent.Pressed, function () {
    brick.showMood(moods.awake)
    motors.largeBC.steer(0, 50, 1, MoveUnit.Rotations)
})
brick.showMood(moods.neutral)
motors.largeBC.setBrake(true)

Step 5 - Left and Right turn

Let’s make the robot turn to the left when the LEFT button is pressed on the brick. Find an ||brick:on button|| block and put a ||motors:steer motors|| in it. Make the turn ratio drive the motor to left. Get another ||brick:on button|| and set it to run when the RIGHT is pressed. Put a ||motors:steer motors|| in for that button and set the turn ratio to drive to the right.

brick.buttonLeft.onEvent(ButtonEvent.Pressed, function () {
    brick.showMood(moods.middleLeft)
    motors.largeBC.steer(-50, 50, 1, MoveUnit.Rotations)
})
brick.buttonRight.onEvent(ButtonEvent.Pressed, function () {
    brick.showMood(moods.middleRight)
    motors.largeBC.steer(50, 50, 1, MoveUnit.Rotations)
})

Step 6 - Backwards

Let’s make the robot go backwards when the DOWN button is pressed on the brick. Add a ||motors:steer motors|| to an ||brick:on button|| block and change the speed to be negative. This will make the motor go backwards.

brick.buttonDown.onEvent(ButtonEvent.Pressed, function () {
    brick.showMood(moods.knockedOut)
    motors.largeBC.steer(0, -50, 1, MoveUnit.Rotations)
})

Step 7 - Add an Ultrasonic sensor

Add an Ultrasonic sensor to your driving base.

If clicking on the image above doesn’t open the instructions, right-click on the image and choose “Save link as…” to download the PDF.

Step 8 - Stopping distance

Create a program that moves the Driving Base and makes it stop 6 cm from the Cuboid.

brick.buttonEnter.onEvent(ButtonEvent.Pressed, function () {
    brick.showMood(moods.dizzy)
    motors.largeBC.steer(0, 50)
    pauseUntil(() => sensors.ultrasonic4.distance() < 6)
    motors.largeBC.stop()
})

Try sending your robot towards a wall!