IOT by JAYDEEP

  UNIT – 4: IoT Protocols 1. Messaging Protocols MQTT (Message Queuing Telemetry Transport) : lightweight, uses publish/subscribe model. CoAP (Constrained Application Protocol) : REST-like, designed for low-power devices. XMPP (Extensible Messaging and Presence Protocol) : originally for instant messaging, also supports IoT. 2. Transport Protocols BLE (Bluetooth Low Energy): short range, low power, used in wearables, health devices. Li-Fi (Light Fidelity): data transmission using LED light modulation. 3. Sensor Network Topologies Point-to-Point: direct connection between 2 nodes. Star: central hub with multiple nodes. Ring: each node connected in a circular path. Mesh: every node connected to multiple nodes (high reliability). Short Questions – UNIT 4 Which IoT protocol uses publish/subscribe? 👉 MQTT What does BLE stand for? 👉 Bluetooth Low Energy Which topology provides maximum reliability? 👉 Mesh MCQs – UNIT 4 MQ...

  UNIT – 3: Programming with Arduino Uno 1. Arduino UNO Board Block Diagram Key components: ATmega328P Microcontroller Power Supply (USB/adapter) Digital I/O Pins (0–13) Analog Input Pins (A0–A5) Reset button USB port (programming) 2. Sketch Structure // Structure of Arduino Program void setup () { // initialization code, runs once } void loop () { // main code, runs continuously } 3. Data Types & Built-in Constants int, float, char, boolean Constants: HIGH, LOW, INPUT, OUTPUT, true, false 4. Operators Arithmetic (+, -, *, /, %) Comparison (==, !=, >, <, >=, <=) Logical/Boolean (&&, ||, !) Bitwise (&, |, ^, ~, <<, >>) Compound (+=, -=, *=, /=) 5. Control Statements and Loops if, else if, else for loop, while loop, do-while loop switch-case 6. Functions User Defined : custom functions created by programmer. Library Functions : I/O Functions : dig...

  UNIT – 2: Things in IoT and IoT Security & Privacy 1. Voltage Considerations for Sensors Sensors operate at specific voltage levels, generally 3.3V or 5V in Arduino and microcontroller systems. Supplying incorrect voltage can damage sensors or provide inaccurate data. Voltage regulators or level shifters are often required when interfacing sensors with microcontrollers. 2. Sensors (Working) PIR Motion Sensor Detects infrared radiation emitted by warm objects (like humans/animals). Works on the principle of change in IR levels in its range. Sharp IR Distance Sensor Uses infrared beam reflection to measure distance. Works based on triangulation of reflected light . LDR (Light Dependent Resistor) Resistance decreases as light intensity increases. Used in street lights, light meters . Gyro Sensor Measures angular velocity (rotation) . Used in robotics, drones, mobile phones . Ultrasonic Distance Sensor Sends ultra...

 1.Which of the following best defines the Internet of Things (IoT)? a) Connecting computers to the internet b) Interconnecting physical devices to collect and exchange data ✅ c) Connecting smartphones only d) Creating websites for devices 2.Which is not a characteristic of IoT? a) Connectivity b) Sensing c) Automation d) Manual operation only ✅ 3.In IoT, the Things/Devices are primarily responsible for: a) Processing data b) Collecting data through sensors ✅ c) Displaying data to users d) Connecting to cloud servers 4.Which IoT application category includes smart thermostats? a) Industrial IoT b) Consumer Applications ✅ c) Smart Agriculture d) Environmental Monitoring 5.Which of these is an example of Industrial IoT? a) Wearable fitness tracker b) Predictive machine maintenance ✅ c) Smart refrigerator d) Smart irrigation 6.In IoT architecture, which layer is responsible for data storage and analysis? a) Sensing Layer b) Network Layer c) Data Processing Layer ✅ d) Application Layer...