1. #include <Adafruit_NeoPixel.h>
3. #define PIN 9 //Arduinoで使うピン
4. #define NUMPIXELS 5//LEDの数。
5. int brightness=50;//明るさ
6. int red_value=0;//赤要素
7. int red_target=0;//赤要素の変化_目標値
8. int green_value=0;//緑要素
9. int green_target=0;//緑要素の変化_目標値
10. int blue_value=0;//青要素
11. int blue_target=0;//青要素の変化_目標値
13. boolean disp=true;
15. Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);
17. void setup()
18. {
19.   pixels.begin(); // NeoPixel出力ピンの初期化
20.   pixels.setBrightness(brightness);
21.   pinMode(PIN,OUTPUT);
23.   red_value=255;
24.   red_target=random(0,255);
25.   green_value=0;
26.   green_target=random(0,255);
27.   blue_value=180;
28.   blue_target=random(0,255);
30.   for(int i=0; i < NUMPIXELS; i++){
31.     pixels.setPixelColor(i,pixels.Color(red_value,green_value,blue_value));
32.   }
33.   pixels.show();
35. }
37. void loop(){
38.   if (disp==true){
39.       // 赤要素の変化 -----------------------
40.         if (red_target>red_value){
41.           //目標値より値が小さかったら、値を増やす
42.           red_value++;
43.         }else if(red_target<red_value){
44.           //目標値より値が大きかったら、値を減らす
45.           red_value--;
46.         }else if(red_target==red_value){
47.           red_value=red_target;
48.           //目標値になったら、目標値を再設定
49.           red_target=random(0,255);
50.         }
51.       //緑要素の変化------------------------
52.         if (green_target>green_value){
53.           green_value++;
54.         }else if(green_target<green_value){
55.           green_value--;
56.         }else if(green_target==green_value){
57.           green_value=green_target;
58.           green_target=random(0,255);
59.         }
60.       //青要素------------------------
61.         if (blue_target>blue_value){
62.           blue_value++;
63.         }else if(blue_target<blue_value){
64.           blue_value--;
65.         }else if(blue_target==blue_value){
66.           blue_value=blue_target;
67.           blue_target=random(0,255);
68.         }
70.       for(int i=0; i < NUMPIXELS; i++){
71.         pixels.setPixelColor(i,pixels.Color(red_value,green_value,blue_value));
72.       }
73.         pixels.show();
74.         delay(50);
75.   }
76. }