//  *******************************
//  PIR triggered stairway lighting
//  *******************************

// PIR sensor has three settings: 
// delay (sensor activated), inhibit (no sensing until), retrigger (trigger during trigger)

int sensorPin1 = A0; //Bottom - Up sensor
int sensorPin2 = A1; //Top - Down sensor
int sensorStatus1;
int sensorStatus2;

const int ledPin[] = {2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13}; // 12 LED pins

void setup() {
  for (int i = 0; i < 12; i++) {
    pinMode(ledPin[i], OUTPUT); // set LED pins as OUTPUT
  }
  pinMode(sensorPin1, INPUT_PULLUP); // set PIR pins as INPUT_PULLUP to stop "bounce"
  pinMode(sensorPin2, INPUT_PULLUP);
}

void loop() {
  sensorStatus1 = digitalRead(sensorPin1); //Stairs TOP sensor - Motion climbing
  if (sensorStatus1 == HIGH) {
    for (int i = 12; i > -1; i--)      // turn lights on
    {
      digitalWrite(ledPin[i], HIGH);
      delay(100);
    }
    delay(2000);// delay time to climb the stairs
    for (int i = 12; i > -1; i--)
    {
      digitalWrite(ledPin[i], LOW);
      delay(100);
    }
    // delay(5000); // PIR stays HIGH for 5 seconds default.  Adjusted JSON to 2
  }

  sensorStatus2 = digitalRead(sensorPin2); //Stairs BOTTOM sensor - Motion descending
  if (sensorStatus2 == HIGH) {
    // turn the LEDs on
    for (int i = 0; i < 12; i++) {
      digitalWrite(ledPin[i], HIGH);
      delay(100);
    }
    delay(2000);// delay time to climb the stairs
    for (int i = 0; i < 12; i++) {
      digitalWrite(ledPin[i], LOW);
      delay(100);
    }
    // delay(5000); // PIR stays HIGH for 5 seconds default.  Adjusted JSON to 2
  }
}

void lightingChase(int nearEnd, int farEnd) {
  int direction = nearEnd > farEnd ? 1: -1;
  int i = nearEnd;
  if (i != farEnd) {
    digitalWrite(ledPin[i], HIGH);
    i += direction;
  }
}