#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);
}