1  // SPDX-FileCopyrightText: 2017 Dano Wall for Adafruit Industries
 2  // SPDX-FileCopyrightText: 2017 Becky Stern for Adafruit Industries
 3  //
 4  // SPDX-License-Identifier: MIT
 5  
 6  //Random Flash animation for Neopixel circuits
 7  //by Dano Wall and Becky Stern for Adafruit Industries
 8  //based on the Sparkle Skirt, minus the accelerometer
 9  #include <Adafruit_NeoPixel.h>
10  
11  #define PIN 1
12  
13  // Parameter 1 = number of pixels in strip
14  // Parameter 2 = pin number (most are valid)
15  // Parameter 3 = pixel type flags, add together as needed:
16  //   NEO_KHZ800  800 KHz bitstream (most NeoPixel products w/WS2812 LEDs)
17  //   NEO_KHZ400  400 KHz (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
18  //   NEO_GRB     Pixels are wired for GRB bitstream (most NeoPixel products)
19  //   NEO_RGB     Pixels are wired for RGB bitstream (v1 FLORA pixels, not v2)
20  Adafruit_NeoPixel strip = Adafruit_NeoPixel(7, PIN, NEO_GRB + NEO_KHZ800);
21  
22  // Here is where you can put in your favorite colors that will appear!
23  // just add new {nnn, nnn, nnn}, lines. They will be picked out randomly
24  //                          R   G   B
25  uint8_t myColors[][3] = {{232, 100, 255},   // purple
26                           {200, 200, 20},   // yellow 
27                           {30, 200, 200},   // blue
28                            };
29                                 
30  // don't edit the line below
31  #define FAVCOLORS sizeof(myColors) / 3
32  
33  void setup() {
34    strip.begin();
35    strip.setBrightness(40);
36    strip.show(); // Initialize all pixels to 'off'
37  }
38  
39  void loop() {
40  flashRandom(5, 1);  // first number is 'wait' delay, shorter num == shorter twinkle
41  flashRandom(5, 3);  // second number is how many neopixels to simultaneously light up
42  flashRandom(5, 2);
43  }
44  
45  void flashRandom(int wait, uint8_t howmany) {
46   
47    for(uint16_t i=0; i<howmany; i++) {
48      // pick a random favorite color!
49      int c = random(FAVCOLORS);
50      int red = myColors[c][0];
51      int green = myColors[c][1];
52      int blue = myColors[c][2]; 
53   
54      // get a random pixel from the list
55      int j = random(strip.numPixels());
56      
57      // now we will 'fade' it in 5 steps
58      for (int x=0; x < 5; x++) {
59        int r = red * (x+1); r /= 5;
60        int g = green * (x+1); g /= 5;
61        int b = blue * (x+1); b /= 5;
62        
63        strip.setPixelColor(j, strip.Color(r, g, b));
64        strip.show();
65        delay(wait);
66      }
67      // & fade out in 5 steps
68      for (int x=5; x >= 0; x--) {
69        int r = red * x; r /= 5;
70        int g = green * x; g /= 5;
71        int b = blue * x; b /= 5;
72        
73        strip.setPixelColor(j, strip.Color(r, g, b));
74        strip.show();
75        delay(wait);
76      }
77    }
78    // LEDs will be off when done (they are faded to 0)
79  }