int pulsador;
int pot;
int pot2;
int valor, valor2, leerpotenciometro;
int leerbrillo;
void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(11, OUTPUT);
pinMode(9,INPUT);
pinMode(A0, INPUT);
}
void loop() {
  // put your main code here, to run repeatedly:
  leerbrillo ;
  leerpulsador ;
  prenderled;


   }


 leerbrillo() {
 valor = analogRead(A0);
 valor2 = (valor +1) / 4 -1;
 if (valor2 < 0) valor2 = 0; 
 return valor2;
}

leerpulsador(){
 pulsador = digitalRead(9); //lee pulsador
 return pulsador;
}

prenderled(){
if (valor2 = 0 < pulsador);
digitalWrite(11;HIGH);
else valor2 >= pulsador;
digitalWrite(11,valor2);
return valor2;
}