Computer Science Grade 4 20 min

10. Project: Building a Simple Robot Controller

Apply the concepts learned in this chapter to build a simple robot controller for a simulated or physical robot.

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Introduction & Learning Objectives

Learning Objectives Write a sequence of commands to make a robot move in a specific path. Define and use a simple function to group robot commands. Use a loop to repeat a set of robot movements. Identify and fix errors in a robot's program (debugging). Explain how a controller sends commands to a robot. Translate a simple shape, like a square, into a robot program. Have you ever wanted to tell a robot what to do, like make it dance or draw a shape? 🤖 Let's learn how to be the boss of a robot using code! In this project, we will learn how to write instructions, called code, to control a simple robot. We will create a 'robot controller' program that tells our robot how to move, turn, and even repeat actions. This is how we bring robots to life! Real-Worl...
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Key Concepts & Vocabulary

TermDefinitionExample ControllerThe 'brain' of our project. It's the program we write that sends instructions to the robot.Our computer, where we write the code, acts as the controller for our robot. CommandA single instruction that tells the robot to do one specific action.The command `move_forward(1)` tells the robot to move forward one step. SequenceA list of commands that the robot follows in order, one after the other.1. `move_forward(1)` 2. `turn_right()` 3. `move_forward(1)`. This is a sequence to make the robot move in an 'L' shape. FunctionA named group of commands that can be used over and over. It's like a shortcut for a sequence of actions.We can create a function called `do_a_spin()` that contains the commands `turn_right()` and `turn_right()`. L...
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Core Syntax & Patterns

Command Syntax command_name(value) Most commands need a name and sometimes a value in parentheses. The name says what to do, and the value says how much. For example, `move_forward(3)` means the action is 'move_forward' and the value is '3 steps'. Sequential Execution Code runs from top to bottom, one line at a time. The robot will always perform the command on line 1, then line 2, then line 3, and so on. The order of your code is very important. Loop Pattern for Shapes repeat [number_of_sides] times { move_forward(length); turn_right(); } To draw a regular shape like a square or triangle, you can use a loop. The loop repeats for the number of sides the shape has. Inside the loop, you have one 'move' and one 'turn' command.

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Sample Practice Questions

Challenging
You want to write one program that can make the robot draw a square of ANY size. Which part of your algorithm should use a variable?
A.The number of sides, which is always 4
B.The angle of the turn, which is always 90 degrees
C.The time or distance for the `moveForward` command
D.The `stop` command at the end
Challenging
A robot has a light sensor to follow a black line on a white floor. What is the best simple logic for the controller to use?
A.If the sensor sees black, stop. If it sees white, go full speed.
B.If the sensor sees white, turn slightly toward the line. If it sees black, move forward.
C.Always move forward and turn left every 2 seconds.
D.If the sensor sees black, move backward. If it sees white, spin in a circle.
Challenging
Your code to make a square is `moveForward(); turnRight(); moveForward(); turnRight(); moveForward(); turnRight(); moveForward(); turnRight();`. How could you make this code shorter and smarter using a loop or function?
A.Create a variable called `square` and set it to `true`
B.Put all the commands on a single, very long line
C.Create a function `moveAndTurn()` and call it four times
D.You cannot make this code any shorter

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