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: 1st Term
Week: 20
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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Welcome, future engineers and innovators! Look around you. Your phone screen is showing sharp, clear numbers (digital). The fan in our classroom might have a dial that lets you choose any speed in between slow and fast (analogue). The world of robotics is built on understanding these two fundamental ideas: analogue and digital. A robot must sense the real, smooth, analogue world (like temperature or distance) and make precise, step-by-step digital decisions to move or act. Understanding this difference is the first major step to designing and building intelligent machines that can interact with our Ghanaian environment, from farms to hospitals.
Part 1: What are Signals?
Before we talk about systems, we must understand signals. A signal is simply a way of carrying information from one place to another. In electronics and robotics, signals are usually represented by changing voltage or current. There are two main types of signals. Part 2: Analogue Signals - The Smooth Wave
An analogue signal is a continuous signal, meaning it can have an infinite number of possible values within a given range. It changes smoothly over time without any breaks or jumps. Think of it like: A ramp: You can stand at any point along its slope. The volume knob on an old radio: You can turn it to get any level of loudness, not just "low" and "high". The dimmer switch for a light bulb: The brightness changes smoothly as you turn the knob. The sound of a person speaking or a drum being played: The sound waves are continuous. Visual Representation: An analogue signal is often drawn as a smooth, flowing wave.
*Notice how the wave flows without any sharp breaks. At any point in time, it has a specific value.* Key Characteristics: Continuous: No gaps or jumps. Infinite Values: Can take on any value within its range (e.g., 1.2V, 1.21V, 1.211V). Represents Reality: Most things in the natural world are analogue (temperature, pressure, light intensity, sound). Part 3: Digital Signals - The Sharp Steps