#include <Adafruit_NeoPixel.h>
#define PIN       D6
#define NUMPIXELS 16

Adafruit_NeoPixel pixels(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

/**
 * Werte von 0..360 auf 0..65k mappen
 */
uint16_t degree2uint16(int degree) {
  return degree * 65536/360;
}

void setup() {
  Serial.begin(9600);
  pixels.begin();
}

void loop() {

  for (unsigned int degree = 0; degree < 360; degree++) {

    uint16_t adafruitHueValue = degree2uint16( degree);
    Serial.print(degree);
    Serial.print("° = ");
    Serial.println(adafruitHueValue);

    uint32_t color = pixels.ColorHSV( adafruitHueValue );
    for (int i=0; i < NUMPIXELS; i++) {
      pixels.setPixelColor( i,  color );
    }
    pixels.show();

    delay(80);
  }

}