Random building lights engine shed

/*random layout module 1 engine shed*/


//Random Lights
#define Shedfront 2
#define Shedmiddle 3
#define Shopback 4
#define Shopfront 5

//Outside Lights
#define Shopdoor 7 /* a shaded entrance light made from a prewired smd led.  It will
turn on at night and off during the day.*/

//Constant Lights
#define Shedback A1 /*This light will be on 24 hours per day.  Will be  3mm led
with 1 k resistor so it is not very bright*/

#define Switch A0 /*Input from daily cycle sketch. A sample sketch can be found at this link  */
int val = 0; // needed to declares val. The initial value is set to zero.

//********************************************
void setup() {
//This sequnce runs once.
  //Constant Lights
  digitalWrite(Shedback, HIGH); //The shed back light turns on and stays on.


  //random lights
  pinMode(Shedmiddle, OUTPUT);
  pinMode(Shedfront, OUTPUT);
  pinMode(Shopfront, OUTPUT);
  pinMode(Shopback, OUTPUT);
  pinMode(Shopdoor, OUTPUT);

  pinMode(Switch, INPUT);

  randomSeed(analogRead(A0)); // This makes the starting point of any random sequence random itself

}

//Routine
void loop() {
//each light sequnce is controlled by a function.
  turnonLights();
  turnoffLights();
  outsideLights();
}

  //**************************************************
  //functions

  void turnonLights()
  {
    val = digitalRead(Switch);
    if (val == HIGH) {
      int Lights = random(2, 6); /*controls the lights on pins 2 thru 5. But when using random
      you have to add 1 to the last pin number.)*/
      int dlay = random(500, 1000); /* The time between lights turning on will vary between 1/2 secong and
      1 second.*/
      digitalWrite(Lights, HIGH);
      delay(dlay);

    }

  }
  //**************************************************
  void turnoffLights() {

    val = digitalRead(Switch);
    if (val == LOW)
    {
      int Lights = random(2, 6);
      int dlay = random(700, 2000);
      digitalWrite(Lights, LOW);
      delay(dlay);

    }
  }
  //************************************************************
  void outsideLights()

  {
    val = digitalRead(Switch);
    if (val == LOW) {

      digitalWrite(Shopdoor, HIGH);
    }
    else {
      digitalWrite(Shopdoor, LOW);

    }
  }