#define pinoLDR 2
#define pinoLed 4

int ValoresLDR = 0;

void setup() {
  Serial.begin(9600);

  pinMode(pinoLDR, INPUT);
  pinMode(pinoLed, OUTPUT);
}

void loop() {
  ValoresLDR = digitalRead(pinoLDR);

  switch(ValoresLDR) {

  case 0:
  Serial.print("Claro: ");
  Serial.println(ValoresLDR);
  digitalWrite(pinoLed, LOW);
  break;

  case 1:
  Serial.print("Noite: ");
  Serial.println(ValoresLDR);
  digitalWrite(pinoLed, HIGH);
  break;
  }

}