SIT315 Task M1 - Interrupt-Driven Distance Radar System

This project is an Arduino-based distance radar system using interrupt-driven programming. It uses both pin change interrupts (PCI) and a timer interrupt to manage inputs and background tasks.

Features:

Measures distance using an ultrasonic sensor

Displays distance on a 16x2 LCD (dot and numeric)

Timer interrupt blinks an LED every second

Two buttons controlled via PCI:

Button 1 toggles the radar system on and off

Button 2 switches between live and hold display modes

Hardware:

Arduino Uno

HC-SR04 ultrasonic sensor

16x2 LCD module

10k potentiometer

2 pushbuttons

Green LED

Breadboard and jumper wires

Files in this repo:

TaskM1.cpp – Arduino code

wokwidiagram.json – Circuit layout for Wokwi

DiagramScreenshot.png – Screenshot of circuit

Serial monitor screenshots.pdf – Output from serial monitor

Demonstration&pics.pdf – Photos of hardware and LCD output

Reflection.txt – Short write-up about the project

How to run:

Upload TaskM1.cpp to the Arduino Uno using Arduino IDE

Build the circuit using the included diagram

Open the Serial Monitor at 9600 baud

Press the buttons and observe the LCD and LED behavior

Sennan Hettiarachchi