// Projeto Led_luminosidade 
int led = 10; 
int valor;
void setup() {
  // put your setup code here, to run once:
  pinMode(led,OUTPUT);    
}

void loop() {
  // put your main code here, to run repeatedly:
  valor = 0;
  while (valor <= 255) {
    analogWrite(led, valor);
    valor = valor + 1;
    delay(20);    
  }  
}