# Automation 
### 1. Definition and Basic Examples

- **What is an automated system?** It is a system designed to operate and control processes with minimal or no continuous human intervention.
    
- **Historical/Simple Example:** A mechanical **cuckoo clock**. It operates on a simple timer mechanism—every hour, it automatically triggers a mechanical sign (the bird).
    
- **Everyday Examples:** **Traffic lights** (operating on timers or traffic sensors).
    
    - **Information screens** for public transport (automatically updating arrival times based on GPS).
        
    - **Washing machines** (running pre-set cleaning cycles).
        

### 2. Advanced Automation

Use these to show you understand complex applications:

- **Autopilots in airplanes:** They maintain altitude and heading without the pilot touching the controls.
    
- **Automatic transmission in cars:** The car's computer automatically shifts gears based on engine speed and load, removing the need for a manual clutch and gear stick.
    

### 3. The Core Concept: Closed-Loop Feedback Systems

This is the technical meat of your notes. To explain this clearly to the committee, describe it as a continuous cycle that constantly corrects itself.

- **Step 1: Desired State & Command:** You set a target (the **desired state**). The **command generator** calculates the **error signal**—the difference between where the system is now and where it needs to be.
    
- **Step 2: Action (The Actuators):** The system sends a **command** to an **amplifier**, which provides **power** to a **motor**. The motor uses a **linkage** (like a mechanical arm or **hand**) to perform the physical action.
    
- **Step 3: Measurement (The Sensors):** The system must check its own work. It uses instruments like a **touch sensor** or **pressure sensor** to measure the new environment.
    
- **Step 4: The Feedback Loop:** The sensor converts the physical measurement into an **output voltage**. A **signal enhancer** takes this data and sends a **feedback signal** straight back to the command generator.
    

**Speaking Strategy for the Exam:**

Start with the simple stuff—everyone understands a washing machine or a traffic light. Then, say: _"However, the most important element of modern automation is the closed-loop feedback system."_ Walk them through the four steps above. If you want to make it super easy to understand, use a thermostat as an example: You set the _desired state_ to 22°C, the _sensor_ measures the room is only 19°C (the _error signal_), it turns on the heater (_motor/power_), and once it hits 22°C, the _feedback signal_ tells it to shut off.