#include "neopixel.h"
#define PIXEL_PIN D2
#define PIXEL_COUNT 16
#define PIXEL_TYPE WS2812
 
Adafruit_NeoPixel strip = Adafruit_NeoPixel(PIXEL_COUNT, PIXEL_PIN, PIXEL_TYPE);
unsigned long lastFade = 0;
int redPercentage=255;


void setup() {

  strip.begin();
  strip.show(); 
}


void loop() {

	unsigned long now = millis();
	if ((now - lastFade) >= 1000) {
		if (redPercentage <= 255 && redPercentage > 0 ) {
		    
		    if(redPercentage < 50) {
		        redPercentage = 0;
		    } else {
		        redPercentage = redPercentage - 50;     
		    }
		    
		}
		lastFade=now;
	}
	
    for(uint16_t i=0; i < strip.numPixels(); i++) {
        strip.setPixelColor(i, 255, redPercentage, redPercentage);
    }

	strip.show();

}