Level 2: Next Customer Please

Official Raspberry Pi Project

This lesson is based on the official Raspberry Pi Foundation project. Open it alongside this guide to access the starter project, step-by-step instructions and community remixes.

How to use it: Click the link above, then click See Inside on the Scratch project to explore the finished version. Use Remix to get your own copy to edit.

What You Will Build

Simulate a queue system using variables, broadcasting and interaction.

What You Will Learn

By the end of this project you will be able to:

• Use Events blocks to start scripts and respond to clicks
• Combine Motion, Looks and Sound blocks to create behaviours
• Use variables to track game state and scores
• Apply the specific Scratch concepts introduced in Level 2

You Will Need

Step-by-Step Guide

1. Create a shop or bank counter backdrop.
2. Add a counter sprite and a queue of customer sprites.
3. Create a queue_number variable starting at 1.
4. Create a current variable for the customer being served.
5. Each customer sprite listens: when I receive [serve] — if queue_number = my_number then come forward.
6. When the cashier sprite is clicked: broadcast [serve], change [current] by [1].
7. Animate the current customer walking to the counter with glide.
8. After being served (wait 2 secs), send them away with another glide.
9. Add a say [Now serving number (current)] display.
10. Add a count of customers remaining in the queue.

Extension Challenges

Try these after completing the main project:

• Add different service times using random waits.
• Add a priority queue for urgent customers.
• Add a satisfaction variable that decreases if customers wait too long.

Reflection Questions

1. Which Scratch blocks did you use most in this project?
2. What would you add or change if you had more time?
3. How could you reuse the ideas from this project in a different context?

Share Your Work

When your project is complete, click Share in Scratch and post the link to your class or the Techbase community.