Lesson Notes By Weeks and Term v4 - SHS 1
Digital and Analogue System Design
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Digital and Analogue System Design
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Subject: Robotics
Class: SHS 1
Term: 2nd Term
Week: 4
Grade code: 1.2.1.LI.2
Strand code: 2
Sub-strand code: 1
Content standard code: 1.2.1.CS.2
Indicator code: 1.2.1.LI.2
Theme: Robot Design Methodologies
Subtheme: Digital and Analogue System Design
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This lesson introduces the fundamental concepts of analogue and digital systems, which are the building blocks of all electronic devices, including robots. In Ghana, we interact with both types of systems every day – from the simple ceiling fan regulator in our classroom to the sophisticated smartphone in our pocket used for Mobile Money (MoMo). Understanding the difference between them is the first step to designing, building, and troubleshooting any robotic or electronic system. This knowledge will help learners appreciate how machines process information from the real world.
(Teacher's Note: Begin by asking learners what the difference is between the volume knob on an old radio and the volume buttons on their phone. Use their answers to introduce the concept of signals.) A. What is a Signal?
A signal is a way of transmitting information from one point to another. Think of it as a message. This message can be a sound, a picture, a temperature reading, or a command to a robot. In electronics, signals are usually represented by a changing voltage or current. There are two main types of signals: analogue and digital. B. Analogue Signals and Systems
An analogue signal is a continuous signal that can have an infinite number of different values within a given range. Key Idea: "Analogue" is similar to the word "analogous," meaning "a representation of." An analogue signal is a direct representation of the physical information it carries. Characteristics: Continuous: The signal changes smoothly over time, with no breaks or jumps. Infinite Values: Between any two points in time, there are endless possible values. Analogy: Think of a ramp. You can stand at any point along its length. There are no fixed steps. Another good analogy is a dimmer switch for a light bulb; you can adjust the brightness smoothly to any level, not just "on" or "off". Graphical Representation: An analogue signal is typically shown as a smooth, flowing curve.
*This graph could represent the changing volume of music or the varying temperature of a room over time.* Ghanaian Context Example: The speed controller for a ceiling fan. You turn the knob, and the fan's speed changes smoothly through all the levels (1, 2, 3, 4, 5), not just jumping from slow to fast. The needle on an old ECG meter is also analogue, as it moves smoothly to show how much power is being used.