SECTION A (2 × 10 = 20 Marks)
Attempt all questions in brief
(a) Define ARM
ARM stands for Advanced RISC Machine. It is a family of reduced instruction set computing (RISC) processors widely used in embedded systems due to their low power consumption, high performance, and compact size. ARM processors are commonly used in mobile phones, tablets, IoT devices, and microcontrollers.
(b) What is an open-source platform?
An open-source platform is a system whose source code is freely available for users to view, modify, and distribute. It promotes collaboration, flexibility, and cost efficiency. Examples include Arduino, Linux, and Raspberry Pi platforms.
(c) Applications of Raspberry Pi
Raspberry Pi is used in home automation systems, robotics projects, media centers, IoT applications, web servers, and educational programming. It is also used for prototyping embedded systems.
(d) Difference between analog and digital circuits
Analog circuits operate on continuous signals that vary smoothly over time, such as audio signals. Digital circuits work with discrete signals, usually represented as binary values 0 and 1. Digital circuits are more reliable, noise-resistant, and widely used in modern electronics.
(e) Define open framework
An open framework is a reusable software or hardware structure that provides a foundation for application development. It allows developers to build systems using predefined libraries, tools, and interfaces without vendor restrictions.
(f) Type of actuator used in Arduino
Arduino commonly uses actuators such as DC motors, servo motors, stepper motors, and relays. These actuators convert electrical signals into physical movement or action.
(g) Define SQLite
SQLite is a lightweight, open-source relational database management system. It stores the entire database in a single file and does not require a separate server process, making it ideal for embedded and mobile applications.
(h) What does XML stand for?
XML stands for Extensible Markup Language. It is used to store and transport data in a structured and human-readable format.
(i) Difference between TCP and UDP
TCP is a connection-oriented protocol that ensures reliable data transfer with error checking and acknowledgment. UDP is a connectionless protocol that offers faster transmission but does not guarantee reliability.
(j) Future scope of IoT
The future of IoT includes smart cities, healthcare monitoring, industrial automation, smart homes, and connected vehicles. IoT will play a major role in automation, data-driven decision-making, and artificial intelligence integration.
SECTION B (10 × 3 = 30 Marks)
(a) Process code, variables, and flow control
Process code refers to a sequence of instructions executed by a microcontroller to perform a specific task. Variables are memory locations used to store data during program execution. Flow control statements such as if-else, loops, and switch statements control the execution path of a program based on conditions, enabling logical decision-making.
(b) Steps of problem solving and DAC
Problem solving in programming involves understanding the problem, analyzing requirements, designing an algorithm, writing code, testing, and debugging. A Digital-to-Analog Converter (DAC) converts digital signals into continuous analog signals and is commonly used in audio and signal processing applications.
(c) Serial Peripheral Interface (SPI)
SPI is a synchronous serial communication protocol used for short-distance communication between microcontrollers and peripherals. It uses a master-slave architecture with lines such as MOSI, MISO, SCLK, and SS. SPI is faster than I2C and commonly used in memory cards, sensors, and display modules.
(d) Need for interfacing and I/O interfacing
Interfacing is required to connect microcontrollers with external devices such as sensors, actuators, and displays. I/O interfacing allows data exchange between the microcontroller and external hardware using input and output ports. It enables real-world interaction of embedded systems.
(e) Peer-to-peer communication using Bluetooth and Wi-Fi
Peer-to-peer communication allows devices to communicate directly without a central server. Bluetooth enables short-range wireless communication, while Wi-Fi allows long-range and high-speed communication. These technologies are used in file sharing, IoT devices, and smart systems.
SECTION C
Q3 (a) Sensor characterization
Sensor characterization is the process of evaluating a sensor’s performance under different conditions. Parameters such as sensitivity, accuracy, resolution, linearity, response time, and hysteresis are analyzed. Proper characterization ensures reliable sensor operation in real-world applications.
Q4 (b) Raspberry Pi technology
Raspberry Pi is a single-board computer that integrates a processor, memory, storage, and input-output interfaces on a small board. It supports Linux-based operating systems and is widely used for programming, automation, and IoT projects. Its GPIO pins allow direct hardware interfacing.
Q5 (a) Communication between hardware components
Hardware components communicate using buses, signals, and communication protocols. Data, address, and control buses enable information transfer. Protocols like I2C, SPI, UART, and USB define communication rules between devices.
Q6 (a) PHP and difference between SQL and SQLite
PHP is a server-side scripting language used for web development. SQL is a standard language for managing relational databases, while SQLite is a lightweight database that does not require a server and is embedded directly into applications.
Q7 (a) UDP protocol
UDP is a transport-layer protocol that sends data without establishing a connection. It is faster than TCP and used in applications where speed is more important than reliability, such as video streaming, online gaming, and live broadcasts.
