platformio,main: add and initialize the NeoPixel

platformio.ini

@@ -16,3 +16,4 @@ build_flags =
 
 lib_deps = 
 	thelsing/knx @ ^1.5.0
+	adafruit/Adafruit NeoPixel@^1.12.3

src/main.cpp

@@ -1,7 +1,14 @@
 #include <Arduino.h>
+#include <Adafruit_NeoPixel.h>
+
+#define NUMPIXELS 1
+
+Adafruit_NeoPixel pixels(NUMPIXELS, PIN_NEOPIXEL, NEO_GRB + NEO_KHZ800);
 
 void setup() {
-
+    pixels.begin();
+    pixels.setPixelColor(0, pixels.Color(0, 150, 0));
+    pixels.show();
 }
 
 void loop() {