Computer Science
Grade 6
20 min
7. Robot Navigation: Path Planning and Obstacle Avoidance
Explore robot navigation techniques, including path planning and obstacle avoidance.
Tutorial Preview
1
Introduction & Learning Objectives
Learning Objectives
Define path planning, obstacle avoidance, and algorithm in the context of robotics.
Explain how a grid map and coordinates (X, Y) help a robot navigate.
Trace a robot's path through a simple maze using the 'Right-Hand Rule' algorithm.
Write a simple sequence of commands (pseudocode) for a robot to move from a start point to an end point on a grid.
Identify potential problems in a simple navigation algorithm, such as getting stuck in a loop.
Modify a simple path plan to avoid a newly discovered obstacle.
Have you ever seen a robot vacuum cleaner get stuck under a chair? 🤔 How can we teach it to be smarter and find its way around?
In this lesson, we'll explore how robots make smart decisions to get from one place to another. We will le...
2
Key Concepts & Vocabulary
TermDefinitionExample
Path PlanningThe process of figuring out the best route for a robot to take from a starting point to a destination, like using a map app to find the fastest way to the store.A robot needs to get from square A1 to square D4 on a grid. Path planning is creating the list of moves: 'move right, move right, move up, move up, move up, move right'.
Obstacle AvoidanceThe robot's ability to use its sensors (like eyes or feelers) to detect things in its way and move around them without crashing.A robot vacuum is moving forward, but its sensor sees a table leg. It stops, turns left, and then continues forward to go around the leg.
AlgorithmA set of step-by-step instructions that a computer or robot follows to complete a task. It's like a recipe for the robot...
3
Core Syntax & Patterns
The 'Sense-Plan-Act' Loop
1. SENSE: Use sensors to check the environment. 2. PLAN: Decide what to do next based on sensor data. 3. ACT: Perform the action (e.g., move, turn).
This is the basic thinking pattern for almost all smart robots. The robot continuously repeats this loop to react to its surroundings in real-time.
The Right-Hand Rule Algorithm
1. Place your right hand on a wall. 2. Start walking forward, always keeping your hand touching the wall. 3. This simple rule will solve most simple mazes.
This is a simple but effective algorithm for maze-solving. A robot can simulate this by always keeping its right-side sensor next to a wall. If the wall ends, the robot turns right to find it again.
Coordinate-Based Movement
To move from (startX, startY) to (e...
4 more steps in this tutorial
Sign up free to access the complete tutorial with worked examples and practice.
Sign Up Free to ContinueSample Practice Questions
Challenging
A delivery robot needs to go from the kitchen (A) to the living room (B), but it MUST also pick up a package from the hallway (C) along the way. Which statement describes the most efficient path plan?
A.Find the shortest path from A to B, and then make a separate trip to C.
B.Go to a random point and then figure out the rest.
C.Find the shortest path from B to C, and then the shortest path from C to A.
D.Calculate the total length of (Path A to C) + (Path C to B), and follow that combined route.
Challenging
A search-and-rescue robot needs to find a person in a damaged building. Path A is the shortest, but goes over an area of sharp, broken glass. Path B is 50% longer, but is on a smooth, stable floor. Why might the robot's programming choose Path B?
A.Because longer paths use more battery, which is good for the robot.
B.Because the robot's pathfinding algorithm is broken.
C.To minimize the risk of getting its wheels or sensors damaged, which would end the mission.
D.Because the robot is programmed to always move as slowly as possible.
Challenging
Two robots, R1 and R2, are in a narrow hallway facing each other and need to swap places. There is a small, one-robot-sized alcove (side room) to the side. What is the most logical, non-crashing plan?
A.Both robots should try to push past each other at the same time.
B.Both robots should turn around and go back to where they started.
C.R1 moves into the alcove, lets R2 pass by in the hallway, then R1 exits the alcove and continues.
D.R1 should wait for R2 to magically disappear from the map.
Want to practice and check your answers?
Sign up to access all questions with instant feedback, explanations, and progress tracking.
Start Practicing Free