Lesson Notes By Weeks and Term v4 - SHS 1
Sensors & Actuators
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Sensors & Actuators
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Subject: Robotics
Class: SHS 1
Term: 1st Term
Week: 12
Grade code: 1.1.3.LI.2
Strand code: 1
Sub-strand code: 3
Content standard code: 1.1.3.CS.1
Indicator code: 1.1.3.LI.2
Theme: Principles of Robotic Systems
Subtheme: Sensors & Actuators
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This lesson introduces the "senses" of robots: sensors. Just as humans use their eyes, ears, and skin to understand the world, robots use sensors to detect light, sound, distance, and touch. We will explore the fundamental scientific principles that make these components work. Understanding these principles is crucial for building and programming robots that can interact intelligently with their environment, from simple automatic streetlights in our communities to complex agricultural robots that could help improve farming in Ghana. We will also briefly touch upon actuators, the "muscles" of a robot, to understand how sensing leads to action.
A. What are Sensors and Actuators?
Think of a simple robotic system as having a brain, senses, and muscles. The Brain: This is the controller, like an Arduino or a computer, which makes decisions. The Senses (Sensors): These are devices that detect and measure physical properties of the environment (like light, temperature, distance, pressure) and convert them into an electrical signal that the "brain" can understand. The Muscles (Actuators): These are devices that convert an electrical signal from the "brain" into physical motion or action (like moving a wheel, lighting an LED, or making a sound).
Analogy: When you accidentally touch a hot pot, your skin (sensor) sends a signal to your brain. Your brain processes this and sends a signal to your arm muscles (actuators) to pull your hand away quickly.
| Component | Human Equivalent | Robotic Example | Function | | :--- | :--- | :--- | :--- | | Sensor | Eyes, Ears, Skin | Light Sensor, Microphone, Touch Sensor | Gathers information from the environment. | | Controller | Brain | Arduino, Raspberry Pi, Microcontroller | Processes information and makes decisions. | | Actuator | Muscles, Voice Box | Motor, LED, Buzzer | Performs an action on the environment. |