int ledPins[8] = {2,3,4,5,6,7,8,9};
  int PIRPin = 12;                        // input pin (for PIR sensor)
  int pirState = LOW;                     // we start, assuming no motion detected
  int PIRval = 0;                         // variable for reading the pin status
  
  int NumOfLEDs = 6;                      // Number of LEDs.. change if you add more
  int OnceOrTwice;
  int PotVal;
  int Ctr;
  long LEDval;
  long randNumber;
  unsigned long TimeToAllOn;

void setup() {

  int index;
  pinMode(PIRPin, INPUT);                 // declare Motion Sensor as input
  pinMode(A0, INPUT);                     // declare Potentiometer as input
  randomSeed(analogRead(1));
  Serial.begin(9600);

  for(index = 0; index <= (NumOfLEDs- 1); index++) {
    pinMode(ledPins[index],OUTPUT);
    // ledPins[index] is replaced by the value in the array.
    // For example, ledPins[0] is 2
  }

}

// the loop function runs over and over again forever
void loop() {

  float delayTimer;                     // declare floating point variable for Delay (.5 to 2.5)
  int val = analogRead(A0);             // read Potentiometer (0 thru 1023)
  val = 250;
  delayTimer = map(val, 0, 1023, 50, 250);   // re-map Pot input (val) to delayTimer (50 thru 250)
  delayTimer = delayTimer / 100.00;     // divide by 100 to get decimal points

  // Serial.print(val);
  // Serial.println(delayTimer);

  PIRval = digitalRead(PIRPin);         // read input value of PIR Motion Sensor

    if (PIRval == HIGH)   {             // check if the input is HIGH (motion detected)
      if (pirState == LOW) {            // motion was just detected this time
        // Serial.println("Motion detected!");
        pirState = HIGH;
    }
  
  randomOnLED();                        // Randomly turn ON all LEDs
    // TimeToAllOn = millis();
    // Serial.print("ALL ON in ");
    // Serial.println(TimeToAllOn / 1000.0, 3);
    Serial.end();

  randomBlinkLED();                      // Randomly blink an LED
  } else {
    if (pirState == HIGH) {
      // Serial.println("Motion ended!");
      pirState = LOW;
      randomOffLED();                    // Randomly turn OFF all LEDs
    }

  }

}

/*
    randomOnLED()

    Randomly turn on LEDs 
    First, check to see if the selected one is already on.
    If it is, decrement the counter and try another random one
  
*/
void randomOnLED()  {
  int Ctr;
  int randNumber;
  float delayTimer;                     // declare floating point variable for Delay (.5 to 2.5)
  int val = analogRead(A0);             // read Potentiometer (0 thru 1023)
  val = 250;
  delayTimer = map(val, 0, 1023, 50, 250);   // re-map Pot input (val) to delayTimer (50 thru 250)
  delayTimer = delayTimer / 100.00;     // divide by 100 to get decimal points

  Ctr = 1;
  // Serial.begin(9600);

  while (Ctr < (NumOfLEDs + 1)) {

  randNumber = random(NumOfLEDs);             // generate a random number for an LED to turn ON

  // Check the status of a randomly selected LED
  // If its already ON, try again
  // 
  LEDval = digitalRead(ledPins[randNumber]);

  // Serial.println(LEDval);
  // Serial.println(randNumber);

  if (LEDval == HIGH) {                       // LED is already on. Lower the Ctr by one and try again.
    Ctr--;
    // Serial.println("ON");
  }
  if (LEDval == LOW) {
      // Serial.print("Turning ON "); Serial.println(ledPins[randNumber]);
      // Serial.print(val);
      // Serial.print("  ");
      // Serial.println(delayTimer);

    digitalWrite(ledPins[randNumber], HIGH);  // turn the LED on (HIGH is the voltage level)
    delay(delayTimer * randNumber * 500);     // wait for a random time
  }
  Ctr++;
  // Serial.println(Ctr);
  }

  }

/*
    randomBlinkLED()
*/
void randomBlinkLED() {
  int i;
  int Ctr;
  int randNumber;
  int RndNum2;
  Ctr = 1;
  Serial.begin(9600);

  while (PIRval == HIGH) {                       // While motion is still detected, do this

    randNumber = random(NumOfLEDs);              // generate a random number from 0 to (Number of LEDs - 1)
    RndNum2 = random(5);                         // random number to change DELAY times
    OnceOrTwice = random(1, 3);                  // randomly select to blink ONCE or TWICE

    delay(RndNum2 * 250);                        // wait for a random time before staring to blink an LED

    // Serial.print("Pin #");
    // Serial.print(ledPins[randNumber]);
    // Serial.print(", Blink ");
    // Serial.print(OnceOrTwice);
    // Serial.println(" time(s)");

    // Cause a randomly selected LED to blink
      for (i = 1; i <= OnceOrTwice; i++) {
      digitalWrite(ledPins[randNumber], LOW);  // turn the LED off 
      delay(i * 200);                          // wait
      digitalWrite(ledPins[randNumber], HIGH); // turn the LED back on 
      delay(RndNum2 * 400);
    }
    PIRval = digitalRead(PIRPin);              // read the Motion Sensor again
    Ctr++;
  }
}

/*
    randomOffLED()
*/
void randomOffLED()  {
  int Ctr;
  int randNumber;
  float delayTimer;                     // declare floating point variable for Delay (.5 to 2.5)
  int val = analogRead(A0);             // read Potentiometer (0 thru 1023)
  val = 1023;
  delayTimer = map(val, 0, 1023, 50, 250);   // re-map Pot input (val) to delayTimer (50 thru 250)
  delayTimer = delayTimer / 100.00;     // divide by 100 to get decimal points
  Ctr = 1;
  // Serial.begin(9600);

  while (Ctr < (NumOfLEDs + 1)) {

    randNumber = random(NumOfLEDs);             // generate a random number for an LED to turn OFF
                                              // Check the status of a randomly selected LED
                                              // If its already OFF, try again
    // Serial.println(ledPins[randNumber]);
    LEDval = digitalRead(ledPins[randNumber]);

    // Serial.println(LEDval);
    // Serial.println(randNumber);

    if (LEDval == LOW) {                       // LED is already off. Lower the Ctr by one and try again.
      Ctr--;
      // Serial.println("ON");
    }
  if (LEDval == HIGH) {
      // Serial.print("Turning OFF "); Serial.println(ledPins[randNumber]);
      // Serial.print(val);
      // Serial.print("  ");
      // Serial.println(delayTimer);
    digitalWrite(ledPins[randNumber], LOW);  // turn the LED off (LOW is the voltage level)
    delay(delayTimer * randNumber * 500);    // wait
  }
  Ctr++;
  // Serial.println(Ctr);
  }

  }