Computer Science
Grade 7
20 min
Lesson 9: Robotics Challenges: Solving Problems with Robots
Participate in robotics challenges that require programming robots to perform specific tasks.
What you'll learn
- Identify at least three different real-world problems that can be solved using robots.
- Explain how a robot's sensors and actuators work together to solve a specific problem, using a given robot example.
- Apply the problem-solving process (define, brainstorm, design, test, improve) to create a simple robot program that navigates a simulated maze with at least 80% accuracy.
- Analyze the effectiveness of different robot designs in solving a specific challenge, comparing at least two designs and justifying which is more effective based on specific criteria (e.g., speed, accuracy, efficiency).
Tutorial Preview
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Introduction & Learning Objectives
Learning Objectives
Analyze a robotics challenge to identify constraints and goals.
Design a step-by-step algorithm using pseudocode or a flowchart to solve a robotics problem.
Implement an algorithm using control structures (loops, conditionals) to control a robot.
Program a robot's sensors to gather data from its environment.
Test and debug a robot's program by observing its behavior and refining the code.
Decompose a complex robotics problem into smaller, manageable sub-problems.
Ever wonder how a robot vacuum avoids falling down the stairs or how a Mars rover navigates rocky terrain? 🤖 Let's program our own smart machines!
In this lesson, you'll become a robotics problem-solver! We will learn how to analyze challenges, design smart solutions using a...
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Key Concepts & Vocabulary
TermDefinitionExample
DecompositionThe process of breaking down a large, complex problem into smaller, more manageable parts.A 'clean the room' challenge is decomposed into smaller tasks: 1. Find trash. 2. Pick up trash. 3. Move to the bin. 4. Drop trash in the bin.
AlgorithmA step-by-step set of instructions or rules for a computer (or robot) to follow to solve a problem.For a line-following robot: 1. Check color sensor. 2. If it sees black, turn slightly right. 3. If it sees white, turn slightly left. 4. Repeat.
Sensor InputInformation a robot gathers from its environment using its sensors.An ultrasonic sensor measures the distance to a wall. A color sensor detects if the floor is black or white.
Actuator OutputA physical action a robot performs using its motors or other movin...
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Core Syntax & Patterns
The Sense-Think-Act Cycle
1. Sense (Read data from sensors). 2. Think (Process data using if/else). 3. Act (Control motors).
This is the fundamental pattern for autonomous robots. The robot continuously runs this loop to react to its environment in real-time.
Conditional Logic for Navigation
if (sensor_reading < threshold) { perform_action_A(); } else { perform_action_B(); }
Use `if-else` statements to make the robot decide between two or more actions based on sensor input. This is essential for avoiding obstacles or following lines.
Looping for Repetitive Tasks
while (condition_is_true) { repeat_this_action(); }
Use a `while` loop to make the robot repeat actions as long as a certain condition is met, like moving forward while the path is clear.
4 more steps in this tutorial
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Sign Up Free to ContinueSample Practice Questions
Challenging
The simple Obstacle Avoider robot from the example (which only turns right) is placed in a narrow dead-end hallway. What will be its most likely behavior?
A.It will successfully turn 180 degrees and exit the hallway.
B.It will approach the end wall, turn right into the side wall, see an obstacle, turn right again, and get stuck in a loop of turning into walls.
C.It will stop at the end of the hallway and wait for instructions.
D.It will move backward out of the hallway automatically.
Challenging
You want to improve the Obstacle Avoider so it is less likely to get stuck in corners. Based on the simple algorithm provided, which modification would be the most effective improvement?
A.If an obstacle is detected, make the robot move backward a short distance before turning.
B.Make the robot move faster when it sees an obstacle.
C.Replace the distance sensor with a color sensor.
D.Remove the `else` condition so the robot only turns.
Challenging
Imagine you need to program a robot to follow a wall on its right side, staying about 15 cm away. It has a right-facing distance sensor. Which pseudocode describes the best core logic for this task?
A.if (distance < 15) { turn_right_slightly(); } else { turn_left_slightly(); }
B.if (distance > 15) { turn_right_slightly(); } else { turn_left_slightly(); }
C.if (distance == 15) { move_forward(); } else { stop(); }
D.if (distance < 15) { turn_left_slightly(); } else { turn_right_slightly(); }
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Start Practicing FreeMore from Chapter 5: Robotics: Building and Programming Autonomous Machines
Lesson 1: What is a Robot? Defining Autonomous Machines
Lesson 2: Robot Components: Sensors, Actuators, and Controllers
Lesson 3: Types of Robots: Exploring Different Designs and Applications
Lesson 4: Introduction to Robot Programming: Giving Robots Instructions
Lesson 5: Basic Robot Movements: Controlling Motors and Actuators
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Lesson 9: Robotics Challenges: Solving Problems with Robots is a Grade 7 Computer Science lesson on ExcelOS.
What will I learn in Lesson 9: Robotics Challenges: Solving Problems with Robots?
You'll be able to: Identify at least three different real-world problems that can be solved using robots; Explain how a robot's sensors and actuators work together to solve a specific problem, using a given robot example; Apply the problem-solving….
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How many practice questions are included with Lesson 9: Robotics Challenges: Solving Problems with Robots?
This lesson includes 49 practice questions across multiple difficulty levels, each with instant feedback and explanations.