// Include the Ultrasonic library
#include <Ultrasonic.h>

// Define pins for ultrasonic sensor
const int trigPin = 7;
const int echoPin = 6;

// Define pins for RGB LED
const int redPin = 11;
const int greenPin = 10;
const int bluePin = 9;

// Define distance thresholds for color changes
const int closeThreshold = 10; // Adjust as needed
const int farThreshold = 20;   // Adjust as needed

// Initialize Ultrasonic object
Ultrasonic ultrasonic(trigPin, echoPin);

// Function prototype
void setColor(int redValue, int greenValue, int blueValue);

void setup() {
  // Initialize serial communication
  Serial.begin(9600);
  
  // Set RGB LED pins as output
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);

  // Set trigPin as output and echoPin as input
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
}

void loop() {
  // Read distance from ultrasonic sensor
  int distance = ultrasonic.read();
  
  // Control RGB LED based on distance
  if (distance <= closeThreshold) {
    // Close range: Turn on red
    setColor(255, 0, 0);
  } else if (distance <= farThreshold) {
    // Medium range: Turn on green
    setColor(0, 255, 0);
  } else {
    // Far range: Turn on blue
    setColor(0, 0, 255);
  }

  // Output distance to serial monitor
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");
  
  delay(500);
}

// Function to set RGB LED color
void setColor(int redValue, int greenValue, int blueValue) {
  analogWrite(redPin, redValue);
  analogWrite(greenPin, greenValue);
  analogWrite(bluePin, blueValue);
}