IoT, Cloud Computing & Emerging Tech

Internet of Things (IoT)

Internet of Things (IoT) refers to the network of physical devices — sensors, appliances, vehicles, machines — that are connected to the internet, collect data, and communicate with each other without human intervention.

The idea is simple: everyday objects become “smart” by connecting to the internet. A soil moisture sensor in a farm field sends data to your phone — that is IoT in action.

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IoT Architecture

IoT systems are built in layers:

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IoT Protocols

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RFID — Radio Frequency Identification

RFID uses radio waves to automatically identify and track objects. An RFID system has:

Types of RFID tags:

• Passive — no battery, powered by reader’s radio signal (cheaper, shorter range)
• Active — has own battery (more expensive, longer range — up to 100m)

Applications: inventory tracking, library books, FASTag toll collection, livestock tagging, supply chain management, passport chips

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IoT Sensors

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IoT in Agriculture (Smart Agriculture)

IoT Cloud Platforms

IIoT — Industrial Internet of Things

IIoT (Industrial IoT) applies IoT specifically to industrial settings — manufacturing, energy, transportation, and agriculture at scale.

• Predictive maintenance — sensors detect equipment wear before breakdown
• Supply chain optimization — real-time tracking of goods
• Quality control — automated inspection using IoT sensors and cameras

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Smart Home Devices

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Cloud Computing

Cloud Computing is the delivery of computing services — servers, storage, databases, networking, software — over the internet (“the cloud”) on a pay-as-you-go basis, instead of owning and maintaining physical hardware.

Cloud Service Models

Easy way to remember: IaaS = you build the house on rented land; PaaS = you furnish a rented apartment; SaaS = you stay in a hotel (everything ready).

Cloud Deployment Models

Major Cloud Providers

Benefits of Cloud Computing

• Scalability — increase/decrease resources as needed
• Cost-effective — pay only for what you use (no upfront hardware cost)
• Accessibility — access from anywhere with internet
• No maintenance — provider handles hardware maintenance
• Disaster recovery — data backed up across multiple locations

MeghRaj — Indian Government Cloud

MeghRaj (GI Cloud) is the Indian Government’s cloud computing initiative to provide cloud services to all government departments, reducing IT costs and improving efficiency.

• Launched by Ministry of Electronics and IT (MeitY)
• National Cloud hosted at NIC (National Informatics Centre)

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Robotics

A robot is a programmable machine capable of carrying out tasks automatically. Robots can be guided by external control, or the control may be embedded within.

Components of a Robot

Types of Robots

Asimov’s Three Laws of Robotics

Isaac Asimov (science fiction writer) proposed three laws:

1. A robot may NOT injure a human or allow a human to come to harm
2. A robot must OBEY human orders (unless it conflicts with Law 1)
3. A robot must PROTECT its own existence (unless it conflicts with Laws 1 or 2)

Robotics in Agriculture

• Drone spraying — pesticide/fertilizer application over large areas
• Harvesting robots — pick fruits/vegetables without damaging them
• Weeding robots — identify and remove weeds using computer vision
• Autonomous tractors — GPS-guided, driverless operation

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Blockchain Technology

Blockchain is a distributed ledger technology where data is stored in blocks that are linked together in a chain using cryptographic hashing. Once recorded, data cannot be altered — making it immutable and transparent.

How Blockchain Works

1. A transaction occurs (e.g., land record transfer)
2. Transaction is broadcast to a network of computers (nodes)
3. Nodes validate the transaction using consensus algorithms
4. Validated transaction is added to a block
5. Block is linked to the previous block using a cryptographic hash
6. The chain becomes permanent and tamper-proof

Key Features

Cryptocurrency

Smart Contracts

Smart Contracts are self-executing contracts where the terms are written directly in code. When conditions are met, the contract automatically executes without intermediaries.

Blockchain Applications

Digital Finance & CBDC

Key difference: CBDC is government-backed and regulated; cryptocurrency is decentralized and unregulated.

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IoT in Smart Agriculture — Example Flow

A typical smart agriculture IoT workflow:

Soil moisture sensor (perception layer) → data sent via LoRaWAN/WiFi (network layer) → Cloud platform processes data → Alert sent to farmer’s phone: “Field 3 needs irrigation” → Farmer activates smart pump remotely

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Edge Computing & Fog Computing

Exam tip: Edge = at the device; Fog = between device and cloud; Cloud = centralized.

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MQTT — IoT Messaging Protocol

MQTT (Message Queuing Telemetry Transport) is the most widely used IoT messaging protocol.

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Smart City Mission India

India’s Smart Cities Mission (launched June 2015) selected 100 cities for smart urban development.

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Cloud Computing — Additional Concepts

AWS (Amazon Web Services)

AWS is the largest cloud provider globally (over 30% market share), offering 200+ services.

GovCloud / MeghRaj

MeghRaj (GI Cloud) is India’s government cloud initiative.

• Hosted at NIC (National Informatics Centre)
• Provides cloud services to all government departments
• Reduces IT costs; promotes data sovereignty

Serverless Computing

Serverless Computing allows running code without managing or provisioning servers.

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Emerging Technologies

NFT (Non-Fungible Token)

NFT is a unique digital ownership certificate stored on a blockchain.

Web 3.0

Web 3.0 is the next evolution of the internet — decentralized, powered by blockchain, AI, and semantic web.

Metaverse

Metaverse is a collective virtual shared space created by the convergence of VR + AR + Blockchain + AI.

• Users interact as avatars in 3D virtual worlds
• Applications: virtual offices, gaming, education, virtual commerce
• Meta (Facebook) rebranded to focus on Metaverse (October 2021)

Digital Twin

Digital Twin is a virtual replica of a physical system that simulates real-world behavior in real-time.

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Key Takeaways

• IoT connects physical devices to the internet — sensors collect data, network transmits it, applications process it
• IoT protocols: MQTT (publish-subscribe, lightweight), LoRaWAN (long-range agriculture), Zigbee (smart home)
• RFID uses radio waves for automatic identification — passive tags (no battery) and active tags (with battery)
• Smart Agriculture: soil moisture sensors, drone monitoring, GPS-guided tractors, livestock RFID
• Edge Computing = process data at the device; Fog Computing = intermediate layer between edge and cloud
• Cloud Computing: IaaS (infrastructure), PaaS (platform), SaaS (software) — pay-as-you-go
• AWS = largest cloud provider globally (30%+ market share); MeghRaj/GovCloud = Indian Government Cloud at NIC
• Serverless Computing (AWS Lambda, Google Cloud Functions) = run code without managing servers, pay per execution
• Smart City Mission: 100 cities selected (June 2015) — smart traffic, waste, surveillance, water, ICCC
• Public/Private/Hybrid cloud deployment models
• Robots have sensors, actuators, controller; Asimov’s 3 Laws govern robot behavior
• Blockchain = distributed, immutable, transparent ledger using cryptographic hashing
• Bitcoin (2009, Satoshi Nakamoto) = first cryptocurrency; Ethereum supports Smart Contracts
• NFT = unique digital ownership certificate on blockchain (mostly Ethereum)
• Web 3.0 = decentralized internet (read-write-own), powered by blockchain, AI, semantic web
• Metaverse = collective virtual shared space (VR + AR + Blockchain + AI)
• Digital Twin = virtual replica of a physical system using real-time IoT data
• e-Rupee (e₹) = India’s CBDC by RBI; different from decentralized cryptocurrency

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Summary Cheat Sheet