This project is a radar-like security system that detects objects using an ultrasonic sensor. Its main purpose is to monitor an area and alert when an object is detected nearby. The idea started from the concept of creating a simple motion detection system using basic electronic components and Arduino. I believe it is useful for others and for myself because it teaches how to integrate sensors, LEDs, a buzzer, a servo motor, and an LCD display into one functional project, while also being a practical solution for learning about automation and basic security systems.

This project is a radar-based security system using an ultrasonic sensor and servo motor to detect nearby objects and give visual and audio alerts. When no object is detected, two green LEDs are lit. When an object is detected within a certain range, the system lights two red LEDs, sounds a buzzer, and displays “Object Detected” on the LCD screen. The sensor continuously scans the area by rotating with the help of a servo motor.

Ultrasonic Sensor

• Detects the distance of objects by emitting sound waves and measuring the time it takes for the echo to return. Mounted on a servo to sweep the detection area.

Arduino Board (UNO)

• Acts as the main controller, processing data and driving outputs like LEDs, buzzer, LCD, and servo.

LCD Display (I2C)

• Shows status messages like “Object Detected” or “Area is Empty”.

LEDs (Red and Green)

• Red indicates detection; green indicates clear area.

Buzzer

• Emits sound when object is detected.

Servo Motor

• Rotates the ultrasonic sensor to scan.

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