Full code scripts for An object detector, with Arduino

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#include <Ultrasonic.h> // Ultrasonic Library
#include <Servo.h>     // Servo Library

Servo servo;

Ultrasonic ultrasonic(4,5); // Ultrasonic object for the Ultrasonic library
int pos;                   // Variable to save the servo position
int distance;             // Variable to save the distance from Ultrasonic sensor
int buzzer = 12;        // Define the buzzer pin to pin 12

void setup()
{

  Serial.begin(9600);        // Begin the serial monitor

  servo.attach(3);          // Attach servo pin

  pinMode(buzzer, OUTPUT); // Make a buzzer pin as output

}

void loop()
{

  for(pos=0;pos&lt;=180;pos++){ // Loop to go from 0 to 180 degrees

    servo.write(pos);  // Write the position to the servo

    distance=ultrasonic.read();  // Read the distance from the ultrasonic sensor

    Serial.print(pos+&quot; , &quot;);  // Write the position to the serial monitor

    Serial.println(distance+&quot; CM&quot;); // Write the distance to the serial monitor

       if(distance&lt;=100){  // Buzzer function when the distance less than 100cm

       digital.write(buzzer,HIGH);  // Turn the buzzer on

       }

       else{

       digital.write(buzzer,LOW);  // Turn the buzzer off

       }

  delay(50); // Wait for 50 milliseconds
  }

  for(pos=180;pos&gt;=0;pos--){  // Loop to go from 180 to 0 degrees

    servo.write(pos);    // Write the position to the servo

    distance=ultrasonic.read();  // Read the distance from the ultrasonic sensor

    Serial.print(pos+&quot; ْ , &quot;);  // Write the position to the serial monitor

    Serial.println(distance+&quot; CM&quot;);  // Write the distance to the serial monitor

      if(distance&lt;=100){  // Buzzer function when the distance less than 100cm

      digital.write(buzzer,HIGH);  // Turn the buzzer on

      }

      else{

      digital.write(buzzer,LOW);  // Turn the buzzer off

      }

  delay(50);  // Wait for 50 milliseconds
  }
}