#include <Adafruit_NeoPixel.h>

#define PIN 6

Adafruit_NeoPixel strip = Adafruit_NeoPixel(150, PIN, NEO_GRB + NEO_KHZ800);
int calibrationTime = 10;
unsigned long timer;
unsigned long interval = 5000;
unsigned long previousMillis = 0;

int downUp = 0;
int sawPir = 0;

int pirPin = 11;    //the digital pin connected to the PIR sensor's output
int ledPin = 13;
int ledPin2 = 10;

void setup(){
  strip.begin();
  strip.show(); // Initialize all pixels to 'off'
  Serial.begin(9600);

  // led
  pinMode(ledPin, OUTPUT);
  pinMode(ledPin2, OUTPUT);

  // pir sensor
  pinMode(pirPin, INPUT);
  digitalWrite(pirPin, LOW);
}
//////////////////////////////LOOP

void loop(){
    previousMillis = millis();
    if(digitalRead(pirPin) == HIGH && downUp != 2){ // top
       timer = millis();
       sawPir = 1;
       downUp = 2;
//       topdown();
      }

       //if the sensor is low or more than the given interval,
       //we assume that no more motion is going to happen
      if ( timer - previousMillis > interval){
           //makes sure this block of code is only executed again after
           //a new motion sequence has been detected
        if (downUp == 1){
           Serial.println("motion ended at downUp 1 (BOTTOM)");      //output
        }
        if (downUp == 2){
           Serial.println("motion ended at downUp 2 (TOP)");      //output
           colourWipeDown(strip.Color(0, 0, 0), 30);   // Warm White
        }
        downUp = 0; // reset
        sawPir = 0; // reset
        Serial.print("motion ended at ");      //output
        Serial.print((millis() - interval)/1000);
        Serial.println(" sec ");
        delay(1000);
      }
  } // end loop

 void topdown() {
    Serial.println("SAW YOU FROM TOP!");               // Helpful debug message
    colourWipeDown(strip.Color(50, 50, 30), 40);    // Warm White
    for(int i=0; i<3; i++) {                        // Helpful debug indication flashes led on Arduino board twice
      digitalWrite(ledPin,HIGH);
      delay(200);
      digitalWrite(ledPin,LOW);
      delay(200);
    }
 }

// Fill the dots one after the other with a color
void colourWipeDown(uint32_t c, uint8_t wait) {
  for(uint16_t i=0; i<strip.numPixels(); i++) {
    strip.setPixelColor(i, c);
    strip.show();
    delay(wait);
  }
}