#include <Ultrasonic.h>

const int trigPin = 12;
const int echoPin = 14;
const int ledPin = 2;
int fadeAmount = 5; 

void setup() {
  Serial.begin(9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(ledPin, OUTPUT);
}

void loop() {
  long duration, distance;

  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);

  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.034 / 2;

  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  if (distance < 100) {
    int mappedBrightness = map(distance, 0, 400, 1023, 0);
    analogWrite(ledPin, mappedBrightness);
    delay(30); 
  } else {
    analogWrite(ledPin, 0);
    delay(100);
  }
}