Loc Radar System — Ultrasonic Radar with Pin-2 Lock

Digital Logic Design · Riphah International University
Instructor: Syed Hassaan
Authors: Hanan Shafay (72442) · Mohid Ahmed (73410) · Umair Hassan (74825)

A real-time ultrasonic radar system built with an Arduino Uno and visualised through a Processing 4 GUI. The radar sweeps an HC-SR04 sensor across a 180° arc, plots detected objects on a phosphor-green display, and features a hardware-toggled lock system that freezes the radar and shows a full animated LOCKED screen.

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Features

• 180° sweep via servo motor in 2° steps
• Distance measurement up to 40 cm using HC-SR04 ultrasonic sensor
• Hardware lock toggle — falling edge on Pin 2 (INPUT_PULLUP) switches radar between ACTIVE and LOCKED states
• Processing 4 display at 1280×720 with:
  • Phosphor-green radar rings, spoke lines, and sweep trail
  • Red blip markers for detected objects
  • Sine-wave beep sounds (pitch varies with distance)
  • Animated LOCKED screen with CRT scanlines, pulsing rings, and padlock
  • Side panel with live angle, distance, FPS, and system info
  • Header with Riphah logo and author credits

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Hardware Required

Component	Details
Arduino Uno	Microcontroller board
HC-SR04	Ultrasonic distance sensor
Servo Motor	Any standard 5V hobby servo
Push button	Normally open, connected to Pin 2 and GND
Jumper wires	As needed

Wiring

Signal	Arduino Pin
Servo	12
TRIG	10
ECHO	11
LOCK (button)	2 → GND

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Software Required

• Arduino IDE with Servo.h (built-in)
• Processing 4 with libraries:
  • processing.serial (built-in)
  • processing.sound — install via Sketch → Import Library → Add Library → Sound

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Setup & Usage

1. Wire the components according to the table above.
2. Open RadarLock/RadarLock.ino in Arduino IDE, select your board and port, and upload.
3. Open RadarProcessingBeep/RadarProcessingBeep.pde in Processing 4.
4. Change the COM_PORT variable at the top of the sketch to match your Arduino's serial port (e.g. "COM3" on Windows, "/dev/ttyUSB0" on Linux).
5. Place riphah.png in the same folder as the .pde file.
6. Run the Processing sketch.
7. Press and release the button on Pin 2 to toggle the radar ON/OFF.

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Serial Protocol

Message	Direction	Meaning
angle,distance.	Arduino → Processing	Sweep data (e.g. 90,15.)
ACTIVE.	Arduino → Processing	Radar turned on
LOCKED.	Arduino → Processing	Radar turned off

The Arduino sends LOCKED. every 500 ms while in locked state to keep the display in sync.

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Project Structure

Loc Radar System Riphah/
├── RadarLock/
│   └── RadarLock.ino          # Arduino firmware
└── RadarProcessingBeep/
    ├── RadarProcessingBeep.pde # Processing display sketch
    └── riphah.png              # University logo asset

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Contributors

Name
HananShafay
Mohid Ahmed
Umair Hassan

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License

Academic project — Riphah International University, Department of Software Engineering.