void setup() {
pinMode(2, INPUT_PULLUP);
Serial.begin(9600);

attachInterrupt(digitalPinToInterrupt(2),citaj,FALLING);

}

void loop() {



}

void citaj(){

  int a = analogRead(A0);
  a = map(a,0,1023,0,100);
  Serial.print(a);
  Serial.println("%");

}