#include <Adafruit_NeoPixel.h>

#define LED_PIN 21 // On Trinket or Gemma, suggest changing this to 1
#define PIR_PIN 32
#define RANDOM_PIN 33

#define NUMPIXELS 8
#define BRIGHTNESS 125

int pixel = NULL;
int last_pixel  = NULL;


Adafruit_NeoPixel pixels(NUMPIXELS, LED_PIN, NEO_RGBW + NEO_KHZ800);
#define DELAYVAL 200

void lotto() {
  for(int i=0; i<30; i++) {
    pixels.clear();

    do {
      pixel = random(0, NUMPIXELS);
    } while (pixel == last_pixel);

    Serial.println(pixel);
    pixels.setPixelColor(pixel, pixels.Color(0, 0, 0, BRIGHTNESS));
    pixels.show();
    last_pixel = pixel;
    delay(DELAYVAL);
  }
}

void setup() {
  Serial.begin(115200);
  Serial.println("Hello Arduino\n");
  pixels.begin(); // INITIALIZE NeoPixel strip object (REQUIRED)
  pinMode(PIR_PIN, INPUT);
}

void loop() {
  pixels.clear(); // Set all pixel colors to 'off'

  // do something on PIR
  if (digitalRead(PIR_PIN) == HIGH) {
    lotto();
  }
}