// Define constants for the hypersonic sensor pins
const int trigPin = 7;
const int echoPin = 6;

// Define constants for the LED bar graph pins
const int ledPins[] = {11, 12, 13, 14, 15, 16, 17, 18, 19, 20};

void setup() {
  // Initialize serial communication for debugging
  Serial.begin(9600);

  // Configure the hypersonic sensor pins
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);

  // Configure the LED bar graph pins as OUTPUT
  for (int i = 0; i < 10; i++) {
    pinMode(ledPins[i], OUTPUT);
  }
}

void loop() {
  // Trigger the hypersonic sensor
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Measure the distance from the sensor
  long duration = pulseIn(echoPin, HIGH);
  int distance = duration / 58; // Convert the duration to distance in centimeters

  // Print the distance to the serial monitor
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  // Update the LED bar graph based on distance
  updateLEDBarGraph(distance);

  // Delay before the next reading
  delay(500);
}

void updateLEDBarGraph(int distance) {
  // Define the distance ranges for different LED colors
  int distanceRanges[] = {10, 20, 30, 40, 50, 60, 70, 80, 100, 120};

  // Loop through the LED bar graph pins and set their states
  for (int i = 0; i < 10; i++) {
    if (distance >= distanceRanges[i]) {
      digitalWrite(ledPins[i], LOW);
    } else {
      digitalWrite(ledPins[i], HIGH);
    }
  }
}