**Course Title:** Introduction to Programming with Scratch **Section Title:** Events and Message Broadcasting **Topic:** Design a project where sprites interact with each other using events and broadcasting messages.(Lab topic) **Objective:** In this lab topic, you will design and create a Scratch project that demonstrates the use of events and message broadcasting to enable interaction between sprites. You will apply the concepts learned in previous topics to create a comprehensive project. **Materials and Setup:** * Scratch account and online editor (https://scratch.mit.edu/) * Two or more sprites with different characteristics (e.g., costumes, colors, shapes) * Backdrop for the stage **Step-by-Step Instructions:** 1. **Project Idea Generation:** Take a few minutes to brainstorm project ideas that involve interaction between sprites. Consider scenarios like: * A conversation between two characters * A competition between multiple participants * A puzzle that requires collaboration between sprites * A role-playing game with multiple characters Choose an idea that interests you the most and sketch out a rough outline of the project. 2. **Sprite Preparation:** Create two or more sprites with distinct characteristics, such as different costumes, colors, or shapes. These sprites will interact with each other in your project. 3. **Broadcasting Messages:** Create a sprite that broadcasts a message when a specific event occurs. For example: * When Sprite A touches Sprite B, it broadcasts the message "Hello" * When Sprite C reaches a certain position on the stage, it broadcasts the message "Start" Use the `Broadcast` block in the Events category to create the broadcast message. 4. **Receiving Messages:** Create a sprite that receives the broadcast message and responds accordingly. For example: * When Sprite A receives the message "Hello", it changes its costume to a happy face * When Sprite C receives the message "Start", it begins moving across the stage Use the `When I Receive` block in the Events category to receive the broadcast message. 5. **Message Processing:** Create additional logic to process the received message. Use conditional statements (if-else) to check the message and perform specific actions. For instance: * If the received message is "Hello", change the sprite's costume to a happy face * If the received message is "Start", begin moving the sprite across the stage 6. **Coordination and Synchronization:** Use broadcasting messages to coordinate the actions of multiple sprites. For example: * When Sprite A reaches a certain position on the stage, it broadcasts the message "Start" * When Sprite C receives the message "Start", it begins moving across the stage * When Sprite C reaches a certain position on the stage, it broadcasts the message "Done" * When Sprite A receives the message "Done", it changes its costume to a happy face **Tips and Variations:** * Use the `Broadcast (and wait)` block to ensure that the message is received before proceeding with the next action. * Use conditional statements to filter out unwanted messages and respond only to specific messages. * Create a hierarchy of messages to coordinate complex actions between multiple sprites. **Lab Exercise:** Design and create a Scratch project that demonstrates the use of events and broadcasting messages to enable interaction between two or more sprites. Use the concepts learned in this topic to create a comprehensive project. You can use the ideas and examples provided above as inspiration or come up with your own unique idea. Once you have completed the lab exercise, review your project to ensure that: * Sprites interact with each other using events and broadcasting messages * Messages are processed and responded to accordingly * The project demonstrates coordination and synchronization between multiple sprites **Comment and Ask for Help:** If you have any questions or need help with this topic, please leave a comment below. We will respond with answers and guidance. **Next Topic:** We will cover the topic 'Working with sprite costumes: Switching and animating costumes' from the section Costumes, Backdrops, and Sounds.