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Lesson 7: Create an IR Obstacle Animation

In our previous missions, we used the Infrared Obstacle Avoidance Module to help our GalaxyRVR automatically steer clear of obstacles - just like a real Mars rover navigating the Red Planet!

Now, let’s take this to the next level by combining the physical IR sensors with a virtual Martian landscape. We’ll create an exciting animation game where you control a rover sprite by triggering the real IR sensors with your hands!

Learning Objectives

• Discover how the Infrared Obstacle Avoidance Module brings your Mars rover to life

• Learn to use IR sensor data to control characters in your Scratch animations

• Build your own Mars exploration game where you dodge rocks using real sensors

Creating the Animation Scene

1. First, Connecting the APP to GalaxyRVR.

2. Setting up the Mars-themed background

   • First, we need a Mars-themed stage background. Click to select a backdrop.

     

   • Choose the Mars background.

     

3. Adding the rover character

   Choose the GalaxyRVR sprite from the library and resize it to fit your scene appropriately.

   

4. Adding obstacles

   Select a Rocks sprite from the library and adjust its size.

   

Programming the GalaxyRVR Sprite

Program your GalaxyRVR sprite to travel across the screen from left to right. Your mission: guide it safely past the rocks! Use your hands to trigger the physical rover’s IR sensors - right sensor moves the sprite down, left sensor moves it up.

1. Set the starting position by moving the sprite to the left edge of the stage. The motion blocks will automatically update with the correct coordinates.

   

2. Add a forever block to create the main program loop that runs continuously.

   

3. Include a conditional block to check if the rover is touching a rock obstacle.

   

4. If no rock is detected, keep moving forward toward the right side.

   

5. If the rover hits a rock, stop all movement and display a warning message.

   

6. Add sensor controls: create events for both IR sensors that move the sprite up (left sensor) or down (right sensor) when triggered by your hand.

   

Programming the Rock Sprite

Let’s create multiple rock obstacles to make the game more challenging! We’ll use cloning to generate rocks at random positions on the stage.

1. Create rock clones using the “create clone of myself” block.

   

2. Make each clone appear at a random location by adding the “go to random position” block.

   

3. Generate ten rocks by repeating the clone creation ten times.

   

4. Set all this action to start when the green flag is clicked.

   

Mission Launch!

Congratulations! Your Mars obstacle avoidance game is ready for launch.

Connect your GalaxyRVR to the APP and click the green flag to begin your mission. Watch as rocks randomly appear across the Martian landscape.

Your challenge: Use your hands to trigger the IR sensors and carefully guide the GalaxyRVR sprite across the screen. Move it up and down to avoid the rocks and reach the right side safely!

Can you complete the mission without any collisions? How quickly can you navigate the obstacle course? Keep practicing to become a master Mars rover pilot!