particle-cloud-connected-led.cpp

#include "neopixel.h"

#define PIXEL_COUNT 29
#define PIXEL_PIN D2
#define PIXEL_TYPE WS2812B

Adafruit_NeoPixel strip = Adafruit_NeoPixel(PIXEL_COUNT, PIXEL_PIN, PIXEL_TYPE);

int pos = -1;

int lightUp(String strPos) {
  pos = strPos.toInt();
  return pos;
}

void setup() {
  Particle.function("lightUp", lightUp);
  strip.begin();
  strip.show();
}
void loop() {
  for (int i=0; i<strip.numPixels(); i++) {
    if (i == pos) {
      strip.setPixelColor(i, strip.Color(255, 0, 0, 255));
    } else {
      strip.setPixelColor(i, strip.Color(0, 0, 0, 0));
    }
  }
  strip.show();
  delay(1000);