1  // SPDX-FileCopyrightText: 2017 Tony Sherwood for Adafruit Industries
 2  //
 3  // SPDX-License-Identifier: MIT
 4  
 5  //fades all pixels subtly
 6  //code by Tony Sherwood for Adafruit Industries
 7  
 8  #include <Adafruit_NeoPixel.h>
 9  
10  #define PIN 1
11  
12  // Parameter 1 = number of pixels in strip
13  // Parameter 2 = pin number (most are valid)
14  // Parameter 3 = pixel type flags, add together as needed:
15  //   NEO_KHZ800  800 KHz bitstream (most NeoPixel products w/WS2812 LEDs)
16  //   NEO_KHZ400  400 KHz (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
17  //   NEO_GRB     Pixels are wired for GRB bitstream (most NeoPixel products)
18  //   NEO_RGB     Pixels are wired for RGB bitstream (v1 FLORA pixels, not v2)
19  Adafruit_NeoPixel strip = Adafruit_NeoPixel(14, PIN, NEO_GRB + NEO_KHZ800);
20  
21  int alpha; // Current value of the pixels
22  int dir = 1; // Direction of the pixels... 1 = getting brighter, 0 = getting dimmer
23  int flip; // Randomly flip the direction every once in a while
24  int minAlpha = 25; // Min value of brightness
25  int maxAlpha = 100; // Max value of brightness
26  int alphaDelta = 5; // Delta of brightness between times through the loop
27  
28  void setup() {
29    strip.begin();
30    strip.show(); // Initialize all pixels to 'off'
31  }
32  
33  void loop() {
34    flip = random(32);
35    if(flip > 20) {
36      dir = 1 - dir;
37    }
38    // Some example procedures showing how to display to the pixels:
39    if (dir == 1) {
40      alpha += alphaDelta;
41    }
42    if (dir == 0) {
43      alpha -= alphaDelta;
44    }
45    if (alpha < minAlpha) {
46      alpha = minAlpha;
47      dir = 1;
48    }
49    if (alpha > maxAlpha) {
50      alpha = maxAlpha;
51      dir = 0;
52    }
53    // Change the line below to alter the color of the lights
54    // The numbers represent the Red, Green, and Blue values
55    // of the lights, as a value between 0(off) and 1(max brightness)
56    //
57    // EX:
58    // colorSet(strip.Color(alpha, 0, alpha/2)); // Pink
59    //colorSet(strip.Color(0, 0, alpha)); // Blue
60    //colorSet(strip.Color(alpha, alpha/2, 0)); // Yellow
61    colorSet(strip.Color(alpha, 0, 0)); // Red
62  }
63  
64  // Fill the dots one after the other with a color
65  void colorSet(uint32_t c) {
66    for(uint16_t i=0; i<strip.numPixels(); i++) {
67        strip.setPixelColor(i, c);
68        strip.show();
69    }
70  }