Computer Science
Grade 6
20 min
Debugging Robot Programs: Finding and Fixing Errors
Students will learn basic debugging techniques to identify and fix errors in their robot programs.
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1
Introduction & Learning Objectives
Learning Objectives
Define the terms 'bug' and 'debugging' in the context of programming.
Identify the difference between a syntax error and a logic error.
Read a simple error message to find the location of a syntax error.
Use print statements to trace the flow of a program and find logic errors.
Apply a systematic process to find and fix a bug in a simple robot program.
Explain why changing only one thing at a time is an effective debugging strategy.
Have you ever given your robot a command, but it did something completely unexpected, or nothing at all? 🤖💥 Let's become code detectives and learn how to solve these mysteries!
In this lesson, you'll learn about 'bugs,' which are errors in your code. We'll explore how to find the...
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Key Concepts & Vocabulary
TermDefinitionExample
BugAn error or mistake in a computer program that causes it to produce an incorrect or unexpected result, or to behave in unintended ways.You tell your robot to move forward 5 steps, but a bug in the code makes it spin in a circle instead.
DebuggingThe process of finding and fixing bugs in your code. It's like being a detective for your program.Running your code line-by-line to figure out why the robot isn't turning when it's supposed to.
Syntax ErrorA mistake in the code that breaks the rules of the programming language, like a typo or missing punctuation. The program usually won't run at all.Writing `robot.forword(50)` instead of `robot.forward(50)`. The computer doesn't understand the misspelled word.
Logic ErrorA mistake in the program�...
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Core Syntax & Patterns
Read the Error Message
Error messages often tell you the type of error and the line number where it occurred.
When your program crashes, don't ignore the red text! Look for a line number and a clue, like 'NameError' or 'SyntaxError'. Go to that line in your code and look for typos or mistakes.
The One-Change-at-a-Time Rule
Only change one thing in your code, then test it again. Repeat until the bug is fixed.
If you change many things at once, you won't know which change actually fixed the problem (or made it worse). This slow and steady method helps you isolate the exact cause of the bug.
The Print Detective
Use `print()` statements to track your program's flow and check variable values.
If you don't know if a part of your code...
4 more steps in this tutorial
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Challenging
Your robot is programmed to avoid obstacles. Sometimes it works perfectly, but other times it bumps into them before turning. The code looks correct and the wires are all secure. What is a likely cause of this inconsistent behavior?
A.The computer has a virus that only works sometimes.
B.The robot's main processor is too fast.
C.Environmental factors, like changing light or reflections, are affecting the distance sensor.
D.The program has a syntax error that only appears randomly.
Challenging
You have a very large program and you suspect a bug is inside a single function called `calculatePath()`. What is the most efficient way to test if this specific function is the source of the error?
A.Temporarily replace the entire function with one line that returns a simple, correct value (e.g., `return 90;`).
B.Delete the function and all the code that uses it.
C.Rewrite the entire program, but be extra careful when writing the `calculatePath()` function.
D.Check all the robot's hardware connections three times.
Challenging
Student A changes five variables in their code at once to try and fix a bug. Student B changes one variable, tests the program, and then changes a second one. Why is Student B's method a more effective debugging strategy?
A.It is faster because you make fewer changes.
B.It is less likely to cause a syntax error.
C.It confuses the computer less.
D.It allows you to know exactly which change fixed the bug or made it worse.
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Start Practicing FreeMore from Introduction to Robotics: Building and Programming Simple Robots
What is Robotics? Exploring the World of Robots
Introduction to Robot Components: Sensors, Actuators, and Controllers
Building a Simple Robot: Assembling the Hardware
Introduction to Block-Based Programming: Programming the Robot's Behavior
Controlling Movement: Programming the Robot to Move Forward, Backward, and Turn