Include NCERT Class 8 Kaushal Bodh Solutions and Class 8 Vocational Education Chapter 4 Home Automation Notes in your preparation plan to revise efficiently.
Home Automation Class 8 Notes
Introduction to Automation
- Automation means using technology to control everyday devices automatically instead of switching things On/OFF by hand.
- It uses sensors, controllers and simple computer programmes to run tasks on their own.
- Automation saves energy, reduces costs and makes daily life more comfortable.
For examples of automation around us
- Motion Sensor Light: Lights in classrooms switch ON/OFF automatically based on movement. When no motion is detected, the lights turn off, saving electricity without manual effort.
- Automatic Garden Irrigation: A moisture sensor in the soil detects dryness of soil and sends a signal to a water pump. The pump switches ON to supply water and automatically turns OFF when soil has enough water.
- Thermostat: Automatically adjusts room temperature just like our body regulates heat by sweating.
- Ancient water clocks and sundials were the earliest examples of automated timekeeping.
Automation in Nature
Automation is not a new idea. It can be seen in nature through the following
- Human Body: The heart beats, lungs breathe in oxygen and release CO2, the stomach digests food automatically after eating, without conscious control. The body uses nerve impulses and hormones as signals just like sensors and controllers in machines.
- Sunrise and Sunset: These occur regularly without any action on our part.
- Water Cycle: Water evaporates from lakes and oceans forms clouds and falls back as rain by following a natural automated cycle.
- Animal Instincts: Birds migrate without Global Positioning System (GPS). Flowers bloom at the right time and bees build honeycombs without being taught.
Journey of Automation
- Automation has gradually evolved from simple natural and mechanical system to advanced intelligent technologies. It’s journey can be understood in the following ways
- Ancient Times (Water Clocks and Sundials) Timekeeping was done by using flow of water or position of the Sun.
- Medieval Period (Mechanical Clocks) Gears and springs were used for autonomous time display.
- Industrial Revolution (Early Smart Machines) Machines like the Jacquard Loom and
Steam Engine were developed. Mechanical Clock - 20th Century (Electronic Devices and Computers) Devices such as automated elevators and calculators were introduced.
- Modem Times (Smart Homes and Robots) AI, sensors and the Internet are uses to automate homes and devices.
- Future (Al-Powered Smart Cities) AI manages city transport, health and energy systems.
Tools and Materials Required
Other Materials and Tools
How to Stay Safe ?
- Safety from Electrical Gadgets: Avoid short circuits and check all connections properly before using circuits.
- Soldering Precautions: Use safety goggles, avoid inhaling fumes and handle the hot soldering iron carefully.
- Handling Tools: Use wire cutters, strippers and other tools carefully to avoid injuries.
- Workplace Safety: Keep the workspace clean, organised and free from unnecessary wires.
Important Note: Most home appliances use 230 V AC supply, while electronic circuits in activities use DC supply; therefore, beginners should use DC batteries only and never connect circuits directly to AC mains as it can be dangerous.
What You Need to Know Before Start?
- Basic Understanding of Circuits: Know how a simple electric circuit works.
- Circuit Diagrams: Be able to draw and read simple circuit diagrams and identify their components.
- Electronic Components: Have basic knowledge of common electronic components and their functions.
Circuit Symbols: Understand the basic symbols used in electrical and electronic circuits. Some basic symbols are given below
Simulation for Building Circuits
- A simulation platform allows circuits to build and tested on a computer without using real components.
- Just like pilots use flight simulators before flying real planes, circuit simulators are used before building real circuits.
- Tinkercad is a popular free simulation platform for beginners.
- Simulation helps in avoiding mistakes while making real-life circuits.
Skin Senses Temperature
When we touch something hot
- Input: The brain processes the information
- Process: Hand moves away from the hot object
- Output: This is exactly how an automation cycle works!
Working of Automation
- Sensors are components allow a circuit to sense things in its environment automatically. For example, a light sensor can switch a circuit ON when it gets dark and a water level sensor can switch a pump OFF when a tank is full.
- Our sense organs (eyes, ears, nose, tongue, skin) are like sensors, they inform our brain about the surroundings.
- Similarly, sensors inform the microcontroller so it can make the right decision automatically.
- Automation follows a simple cycle that allows machines to perform tasks without constant human control. This cycle is explained in the table below
The Automation Cycle
| Input (Sensing) | Process (Decision Making) | Output (Action) |
| Sensors detect changes in the surroundings such as motion, temperature, or light. | A microcontroller analyses the input and decides what action to take. | The system carries out the decided action. |
| Example: A motion sensor detects movement in a room. | Example: If movement is detected, the processor decides to turn the lights ON. | Example: Lights turn ON automatically whenever motion is detected. |
Example of Automatic Street Light
Microcontroller – The Brain of Automation
- Microcontroller is the brain of an automation circuit. It receives sensor data, processes it and sends commands to output devices. The set of instructions given to a microcontroller is called a programme.
- Arduino Uno (a) and Raspberry Pi Pico (b) are popular microcontrollers for beginners.
- Each microcontroller has different number of pins. The pins of Arduino-Uno are shown in the table below
Arduino Uno – Key Parts
| Part | Function |
| Analog Pins (A0-A5) | Connect input/output devices such as LEDs, sensors and motors. |
| Digital Pins (0-13) | Give ON/OFF signals to LEDs, buzzers and motors. |
| Universal Serial Bus (USB) Port | Connects Arduino to a computer for programming. |
| Power Supply | USB cable or a battery powers the board. |
| Reset Button | Restarts the programme running on the board. |
| GND (Ground) | Reference point of voltage; protects the circuit and the user. |
Output Devices
- Output devices are piece of hardware that receive commands from the microcontroller and carry out the required action.
- They can function with or without sensor based input devices. They can be operated either through signals from sensors or through instructions received from a microcontroller.
- For examples, LEDs, buzzers, DC motors, servo motors, stepper motors, relays, LCD displays and speakers.
Making Simple Circuits Using Microcontrollers
- Microcontrollers are control devices that are connected with input and output devices to form a smart circuit.
- A breadboard is used to connect different components without soldering. It is used only for prototyping, which means testing a model of the circuit. It allows quick testing and easy rearrangement of components if the circuit does not work properly.
- After successful testing, the components are soldered to make the circuit permanent.
What Else Can I Do?
You can try the following to expand your learning
- You can supply power to the Arduino board through a computer USB port. To make the circuit independent of the computer, you can use batteries or power adapters. For field use, can package the system with batteries.
- You can power the Arduino board using Lithium-ion batteries and connect them using DC connector cables. You can also make a suitable casing using a 3D printer or other available materials.
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