int leitura = 0;
int led=5;
int LDR=3;
void setup()
{
  Serial.begin(9600);
  pinMode(led, OUTPUT);
  pinMode(LDR, INPUT);
}

void loop()
{
  leitura = digitalRead(LDR);
	Serial.print("Leitura: ");
  Serial.println(leitura);
  if (leitura==HIGH){
    digitalWrite(led,HIGH);
  }
  else{
    digitalWrite(led,LOW);    
  }
	delay(1000);
}