The garages are getting more and more tight: page: https://goo.gl/pj20lS

_32_arduSerie_sketch_01.No_Bluetooth.ino

#define trigPin 13
#define echoPin 12
#define stop_LED 11
#define go_LED 10

void setup() {

  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(stop_LED, OUTPUT);
  pinMode(go_LED, OUTPUT);
}

void loop() {
  long duration, distance;
  digitalWrite(trigPin, LOW);     // Added this line
  delayMicroseconds(2);           // Added this line
  digitalWrite(trigPin, HIGH);
                                  //  delayMicroseconds(1000); - Removed this line
  delayMicroseconds(10);          // Added this line
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = (duration ) / 58.2;
  if (distance < 5) {             // This is where the LED On/Off happens
    digitalWrite(stop_LED, HIGH); // When the Red condition is met, the Green LED should turn off
    digitalWrite(go_LED, LOW);
  }
  else {
    digitalWrite(stop_LED, LOW);
    digitalWrite(go_LED, HIGH);
  }
  delay(500);
}