//control led brightness dpending on distance of object detected if object near led brightness is high if object is far led brightness is low with ultrasonic sensor 
int trigPin = 12;
int echoPin = 13;
int ledPin = 14;
void setup() {
  Serial.begin(9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(ledPin, OUTPUT);
}
void loop() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

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

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

  if (distance <= 15) {
    analogWrite(ledPin, 255);
  } else if (distance <= 50) {
    analogWrite(ledPin, 128);
  } else if (distance <= 90) {
    analogWrite(ledPin, 64);
  } else {
    analogWrite(ledPin, 0);
  }

  delay(100);
}