#include <HCSR04.h>

UltraSonicDistanceSensor distanceSensor(22, 21);  // Initialize sensor that uses digital pins 13 and 12.

void setup () {
    Serial.begin(9600);  // We initialize serial connection so that we could print values from sensor.
  pinMode(25,OUTPUT);
}

void loop () {
    // Every 500 miliseconds, do a measurement using the sensor and print the distance in centimeters.
    int dist = distanceSensor.measureDistanceCm();
    Serial.println(dist);
    
    int mapped = map(dist,5,300,0,255);
    analogWrite(25,mapped);
    
    delay(500);
}