const int led1=2;
const int led2=3;
const int led3=4;
const int potpin=A0;// pin del potenciometro

void setup() {
pinMode(led1, OUTPUT);
pinMode(led2, OUTPUT);
pinMode(led3, OUTPUT);
Serial.begin(9600);
}

void loop() {
 int valor= analogRead(potpin);
 Serial.println(valor);

 if (valor<256){
  digitalWrite(led1, LOW);
  digitalWrite(led2, LOW);
  digitalWrite(led3, LOW);
 }
 else if (valor<512){
  digitalWrite(led1, HIGH);
  digitalWrite(led2, LOW);
  digitalWrite(led3, LOW);

 }
  else if (valor<768){
  digitalWrite(led1, HIGH);
  digitalWrite(led2, HIGH);
  digitalWrite(led3, LOW);

 }
 else{
  digitalWrite(led1, HIGH);
  digitalWrite(led2, HIGH);
  digitalWrite(led3, HIGH);
 }

}