const int trigPin = 5;
const int echoPin = 18;
const int Rele=17;
#define SOUND_SPEED 0.034

long duration;
float distanceCm;
float distanceInch;

void setup() {
  Serial.begin(115200);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(Rele,OUTPUT);
}

void loop() {
  // Clears the trigPin
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  // Sets the trigPin on HIGH state for 10 micro seconds
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  duration = pulseIn(echoPin, HIGH);
  distanceCm = duration * SOUND_SPEED/2;
  delay(500);
  if(distanceCm<=140 && distanceCm>=130){
    Serial.println("Tinaco Vacio");
    llenando();
  }
  if(distanceCm>=40 && distanceCm<=60){
    Serial.println("Tinaco LLeno");
    Parar();
  }
}
void llenando(){
  digitalWrite(Rele,HIGH);
}
void Parar(){
  digitalWrite(Rele,LOW);
}