Lesson Notes By Weeks and Term v4 - SHS 1
Robot Control Principles
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Robot Control Principles
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Subject: Robotics
Class: SHS 1
Term: 1st Term
Week: 9
Grade code: 1.1.2.LI.2
Strand code: 1
Sub-strand code: 2
Content standard code: 1.1.2.CS.1
Indicator code: 1.1.2.LI.2
Theme: Principles of Robotic Systems
Subtheme: Robot Control Principles
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Welcome, learners! Today, we are going to look inside the "body" of a robot. Just like our own bodies have different parts that work together—our brain, heart, eyes, and muscles—robots also have different parts called "subsystems." We see technology like the Zipline drones delivering medical supplies in rural Ghana, or we hear about automated systems in factories. Understanding how these robots are built from different, connected parts is the first step to being able to design, build, and even repair them ourselves. This knowledge is crucial for anyone interested in Ghana's growing technology and engineering sectors.
What is a Subsystem?
Think of a football team. You have defenders, midfielders, strikers, and a goalkeeper. Each group is a "subsystem." They have a special job, but they must work together and communicate to win the match. If the defenders fail, the goalkeeper is in trouble. If the midfielders can't pass the ball, the strikers can't score.
Similarly, a robot subsystem is a major component or group of components that performs a specific function within the robot. All the subsystems must be connected and work together for the robot to operate correctly.
We can classify most robot subsystems into five main categories. A good way to remember them is with the acronym C-S-A-P-S: Controller, Sensors, Actuators, Power Supply, and Structure. The Five Main Subsystems of a Robot The Controller (The Brain) Functionality: This is the central processing unit or the "brain" of the robot. It runs the program (the set of instructions we give it). It receives information from the sensors, makes decisions based on its programming, and sends commands to the actuators. Attributes: Its main attribute is its processing power (how fast it can think) and memory (how much information it can store). Examples: A microcontroller like an Arduino Uno, a Raspberry Pi, or the central computer in a complex industrial robot. Analogy: It is like the brain and nervous system in a human, making all the decisions. Sensors (The Senses) Functionality: Sensors are devices that collect information about the robot's environment or its own internal state. They are the robot's "senses"—its eyes, ears, and sense of touch. Attributes: Key attributes include range (how far it can sense), precision (how accurate its readings are), and the type of data it collects (light, sound, distance, temperature). Examples in a Ghanaian Context: Ultrasonic Sensor: Uses sound waves to measure distance. A robot could use this to avoid bumping into a wall in a classroom or a piece of furniture at home. Light Sensor (LDR): Detects the level of light. A simple robot could be programmed to follow a black line on a white floor by detecting the difference in reflected light. Moisture Sensor: Can detect the amount of water in the soil. An automated farming robot on a cocoa plantation could use this to decide when to water the seedlings. Actuators / Effectors (The Muscles) Functionality: These are the components that allow the robot to move or interact with its environment. They convert electrical energy into physical motion. They are the "muscles" of the robot. Attributes: Important attributes are speed, torque (rotational force), and degrees of freedom (how many ways it can move). Examples: DC Motors: Used to spin wheels for a mobile robot. Servo Motors: Allow for precise, controlled rotation, like in the joints of a robotic arm that could be used to pick up an orange. Grippers: Act as the robot's "hand" to pick up or hold objects. Power Supply (The Heart and Stomach) Functionality: This subsystem provides the electrical energy needed to run the controller, sensors, and actuators. Without it, the robot is just a lifeless object. Attributes: Key attributes are voltage (the electrical "pressure") and capacity (measured in Ampere-hours, determining how long the robot can operate). Examples: Batteries: (AA, Li-Po batteries) for mobile robots. Mains Power: An AC adapter that plugs into a wall socket for stationary robots (like those in a factory). Solar Panels: To recharge batteries for robots operating outdoors, like an environmental monitoring robot. Structure / Chassis (The Skeleton) Functionality: This is the physical frame of the robot that holds everything together. It provides support, protection for the delicate electronics, and determines the robot's physical shape. Attributes: Its attributes are material (e.g., plastic, metal, wood), weight, and durability. Example: The metal frame of a wheeled robot, the plastic casing of a drone, or the linked segments of a robotic arm. How They Interconnect: The Flow of Control