#define pinSensor A0  //Define Sensor Pin
#define pinLeds 7   //Define Leds pin

void setup() {
Serial.begin(9600);
pinMode(pinLeds , OUTPUT);//Define pineLeds as an output
pinMode(pinSensor , INPUT);
}

void loop() {
delay(500);
 //Read the analog read of pinSensor
float voltaje = analogRead(pinSensor) * (5 / 1023.0);


float distance =(12.84/voltaje) - 0.42;


Serial.print("Distance(cm):");
Serial.println(distance);

if (distance < 15 && distance > 4){
  digitalWrite(pinLeds , HIGH);

} else{
  digitalWrite(pinLeds , LOW);

}
}