94 lines
3.2 KiB
Markdown
94 lines
3.2 KiB
Markdown
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# Robot 2 Lesson
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## Step 1 Build Your Driving Base Robot @unplugged
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Build the robot driving base:
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[](https://le-www-live-s.legocdn.com/sc/media/lessons/mindstorms-ev3/building-instructions/ev3-rem-driving-base-79bebfc16bd491186ea9c9069842155e.pdf)
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If clicking the above image doesn't open the instructions, right-click on the image and choose "Save link as..." to download the PDF.
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## Step 2 Show an image and move @fullscreen
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Add the blocks to show an image and move the motors **B+C** for ``1`` rotation.
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```blocks
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brick.showMood(moods.neutral)
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motors.largeBC.steer(0, 50, 1, MoveUnit.Rotations)
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```
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## Step 6 Brick button @fullscreen
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Let's change the code so that your robot moves when the **UP** button is pressed.
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Add a ``||brick:on button enter||`` block and move the ``||motors:steer motors||`` under it.
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After downloading your code, press **UP** to move the robot.
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```blocks
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brick.buttonUp.onEvent(ButtonEvent.Pressed, function () {
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motors.largeBC.steer(0, 50, 1, MoveUnit.Rotations)
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})
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brick.showMood(moods.neutral)
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```
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## Step 6 Braking @fullscreen
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When the motors are done turning, the robot keeps on moving for a short distance.
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Turn on the **brakes**, so that your robot stops immediately.
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Drag a ``||motors:set brake||`` block into the ``||loops:on start||`` and set it **ON** to the BC motors.
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```blocks
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brick.buttonUp.onEvent(ButtonEvent.Pressed, function () {
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motors.largeBC.steer(0, 50, 1, MoveUnit.Rotations)
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})
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brick.showMood(moods.neutral)
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motors.largeBC.setBrake(true)
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```
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## Step 8 Left and Right turn @fullscreen
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Let's make the robot turn to the left when the **LEFT** button is pressed on the brick (and same for the right button).
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Add a ``||steer motors||`` and change the turn ratio to go left.
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```blocks
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brick.buttonLeft.onEvent(ButtonEvent.Pressed, function () {
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motors.largeBC.steer(-50, 50, 1, MoveUnit.Rotations)
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})
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brick.buttonRight.onEvent(ButtonEvent.Pressed, function () {
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motors.largeBC.steer(50, 50, 1, MoveUnit.Rotations)
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})
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```
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## Step 9 Backwards @fullscreen
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Let's make the robot turn to the right when the **RIGHT** button is pressed on the brick.
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Add a ``||steer motors||`` and change the speed to be negative. This will make the motor go backwards.
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```blocks
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brick.buttonDown.onEvent(ButtonEvent.Pressed, function () {
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motors.largeBC.steer(0, -50, 1, MoveUnit.Rotations)
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})
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```
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## Step 10 Add a Ultrasonic sensor @fullscreen
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Add a Ultrasonic sensor to your driving base.
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[](https://le-www-live-s.legocdn.com/sc/media/lessons/mindstorms-ev3/building-instructions/ev3-ultrasonic-sensor-driving-base-61ffdfa461aee2470b8ddbeab16e2070.pdf)
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If clicking the above images don't open the instructions, right-click on the image and choose "Save link as..." to download the PDF.
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## Step 11 @fullscreen
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Create a program that moves the Driving Base and makes it stop 6 cm from the Cuboid.
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```blocks
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brick.buttonEnter.onEvent(ButtonEvent.Pressed, function () {
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motors.largeBC.steer(0, 50)
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pauseUntil(() => sensors.ultrasonic4.distance() < 6)
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motors.largeBC.stop()
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})
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```
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Try sending your robot towards a wall!
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