NeoPixel 테스트

네오픽셀하나에 평균 20mA이고 최대 60mA까지 사용합니다. 8개짜리 네오픽셀이라고 해도 최대 480mA나 사용 가능하기 때문에 USB의 최대 허용 500mA 를 고려하면 아래 그림처럼 네오픽셀 전원 공급은 따로 하는게 좋겠지요. 테스트해보니 엄청 화려하긴 하네요. 어떤 용도로 사용할지 고민이 필요하네요.

1. #include <Adafruit_NeoPixel.h>
3. #define PIN 6
5. // Parameter 1 = number of pixels in strip
6. // Parameter 2 = Arduino pin number (most are valid)
7. // Parameter 3 = pixel type flags, add together as needed:
8. // NEO_KHZ800 800 KHz bitstream (most NeoPixel products w/WS2812 LEDs)
9. // NEO_KHZ400 400 KHz (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
10. // NEO_GRB Pixels are wired for GRB bitstream (most NeoPixel products)
11. // NEO_RGB Pixels are wired for RGB bitstream (v1 FLORA pixels, not v2)
12. // NEO_RGBW Pixels are wired for RGBW bitstream (NeoPixel RGBW products)
13. Adafruit_NeoPixel strip = Adafruit_NeoPixel(8, PIN, NEO_GRB + NEO_KHZ800);
15. void setup() {
16. strip.begin();
17. strip.setBrightness(50);
18. strip.show(); // Initialize all pixels to 'off'
19. }
21. void loop() {
22. // Some example procedures showing how to display to the pixels:
23. colorWipe(strip.Color(255, 0, 0), 50); // Red
24. colorWipe(strip.Color(0, 255, 0), 50); // Green
25. colorWipe(strip.Color(0, 0, 255), 50); // Blue
26. //colorWipe(strip.Color(0, 0, 0, 255), 50); // White RGBW
27. // Send a theater pixel chase in...
28. theaterChase(strip.Color(127, 127, 127), 50); // White
29. theaterChase(strip.Color(127, 0, 0), 50); // Red
30. theaterChase(strip.Color(0, 0, 127), 50); // Blue
32. rainbow(20);
33. rainbowCycle(20);
34. theaterChaseRainbow(50);
35. }
37. // Fill the dots one after the other with a color
38. void colorWipe(uint32_t c, uint8_t wait) {
39. for(uint16_t i=0; i<strip.numPixels(); i++) {
40. strip.setPixelColor(i, c);
41. strip.show();
42. delay(wait);
43. }
44. }
46. void rainbow(uint8_t wait) {
47. uint16_t i, j;
49. for(j=0; j<256; j++) {
50. for(i=0; i<strip.numPixels(); i++) {
51. strip.setPixelColor(i, Wheel((i+j) & 255));
52. }
53. strip.show();
54. delay(wait);
55. }
56. }
58. // Slightly different, this makes the rainbow equally distributed throughout
59. void rainbowCycle(uint8_t wait) {
60. uint16_t i, j;
62. for(j=0; j<256*5; j++) { // 5 cycles of all colors on wheel
63. for(i=0; i< strip.numPixels(); i++) {
64. strip.setPixelColor(i, Wheel(((i * 256 / strip.numPixels()) + j) & 255));
65. }
66. strip.show();
67. delay(wait);
68. }
69. }
71. //Theatre-style crawling lights.
72. void theaterChase(uint32_t c, uint8_t wait) {
73. for (int j=0; j<10; j++) { //do 10 cycles of chasing
74. for (int q=0; q < 3; q++) {
75. for (uint16_t i=0; i < strip.numPixels(); i=i+3) {
76. strip.setPixelColor(i+q, c); //turn every third pixel on
77. }
78. strip.show();
80. delay(wait);
82. for (uint16_t i=0; i < strip.numPixels(); i=i+3) {
83. strip.setPixelColor(i+q, 0); //turn every third pixel off
84. }
85. }
86. }
87. }
89. //Theatre-style crawling lights with rainbow effect
90. void theaterChaseRainbow(uint8_t wait) {
91. for (int j=0; j < 256; j++) { // cycle all 256 colors in the wheel
92. for (int q=0; q < 3; q++) {
93. for (uint16_t i=0; i < strip.numPixels(); i=i+3) {
94. strip.setPixelColor(i+q, Wheel( (i+j) % 255)); //turn every third pixel on
95. }
96. strip.show();
98. delay(wait);
100. for (uint16_t i=0; i < strip.numPixels(); i=i+3) {
101. strip.setPixelColor(i+q, 0); //turn every third pixel off
102. }
103. }
104. }
105. }
107. // Input a value 0 to 255 to get a color value.
108. // The colours are a transition r - g - b - back to r.
109. uint32_t Wheel(byte WheelPos) {
110. WheelPos = 255 - WheelPos;
111. if(WheelPos < 85) {
112. return strip.Color(255 - WheelPos * 3, 0, WheelPos * 3);
113. }
114. if(WheelPos < 170) {
115. WheelPos -= 85;
116. return strip.Color(0, WheelPos * 3, 255 - WheelPos * 3);
117. }
118. WheelPos -= 170;
119. return strip.Color(WheelPos * 3, 255 - WheelPos * 3, 0);
120. }