const int ECHO = 8;
const int TRIG = 7;
const int dia = 4;
const int noche = 5;
const int FOTO = A2;
const int disMax = 20;
int luz = 0;
float tiempo = 0, espacio = 0;

void setup() {
  pinMode(ECHO, INPUT);
  pinMode(TRIG, OUTPUT);
  pinMode(dia, OUTPUT);
  pinMode(noche, OUTPUT);
  digitalWrite(dia, LOW);
  digitalWrite(noche, HIGH);
  digitalWrite(ECHO, HIGH);
  digitalWrite(TRIG, LOW);
  Serial.begin(9600);
}

void loop() {

  luz = analogRead(FOTO);
  Serial.println(luz);
  if(luz<=5){
    digitalWrite(TRIG, HIGH);
  delayMicroseconds(4);
  digitalWrite(TRIG, LOW);
  tiempo = pulseIn(ECHO, HIGH);
  espacio = tiempo/59;
  if(espacio<disMax){
    digitalWrite(dia,LOW);
    digitalWrite(noche,HIGH);
    delay(10000);
  }else{
    digitalWrite(dia,HIGH);
    digitalWrite(noche,LOW);
    delay(10000);
  }
  Serial.print("La distancia es: ");
  Serial.println(espacio);
  delay(1000);
  }else{
    digitalWrite(dia, HIGH);
    digitalWrite(noche, HIGH);
    delay(1000);
  }


}