coding

/*

  Ultrasonic Sensor with RGB LED and Buzzer

  This code uses an ultrasonic sensor to measure distance, and based on the distance,

  it controls an RGB LED to display red color if the distance is less than 10 cm, and

  green color if the distance is greater than or equal to 10 cm. Additionally, a buzzer

  beeps when the distance is less than 10 cm.

*/

// Pin Definitions

const int trigPin = 9;    // Trigger pin for the ultrasonic sensor

const int echoPin = 10;   // Echo pin for the ultrasonic sensor

const int redPin = 3;     // Red pin for the RGB LED

const int greenPin = 5;   // Green pin for the RGB LED

const int bluePin = 6;    // Blue pin for the RGB LED

const int buzzerPin = 7;  // Pin for the buzzer

// Variables

long duration, distance;  // Variables to store the duration and distance measured by the ultrasonic sensor

void setup() {

  // Pin Modes

  pinMode(trigPin, OUTPUT);

  pinMode(echoPin, INPUT);

  pinMode(redPin, OUTPUT);

  pinMode(greenPin, OUTPUT);

  pinMode(bluePin, OUTPUT);

  pinMode(buzzerPin, OUTPUT);

  // Start Serial Communication

  Serial.begin(9600);}

void loop() {

  // Trigger the Ultrasonic Sensor

  digitalWrite(trigPin, LOW);

  delayMicroseconds(2);

  digitalWrite(trigPin, HIGH);

  delayMicroseconds(10);

  digitalWrite(trigPin, LOW);

  // Measure the Duration and Distance

  duration = pulseIn(echoPin, HIGH);

  distance = duration * 0.034 / 2;

 // Display LED and Buzzer based on Distance

  if (distance < 10) {

    // Display Red LED

    digitalWrite(redPin, HIGH);

    digitalWrite(greenPin, LOW);

    digitalWrite(bluePin, LOW);

    // Turn On Buzzer

    digitalWrite(buzzerPin, HIGH);

    delay(500);  // Wait for 500 milliseconds

    digitalWrite(buzzerPin, LOW);  // Turn Off Buzzer

  } else {

    // Display Green LED

    digitalWrite(redPin, LOW);

    digitalWrite(greenPin, HIGH);

    digitalWrite(bluePin, LOW);

    // Turn Off Buzzer

    digitalWrite(buzzerPin, LOW);  } 

  // Print Distance to Serial Monitor

  Serial.print("Distance: ");

  Serial.print(distance);

  Serial.println(" cm");

  delay(500);  // Wait for 500 milliseconds before taking the next measurement}