1  // SPDX-FileCopyrightText: 2019 Limor Fried for Adafruit Industries
 2  //
 3  // SPDX-License-Identifier: MIT
 4  
 5  #if 0 // Change to 1 to enable this code (must enable ONE user*.cpp only!)
 6  
 7  #include <Adafruit_NeoPixel.h>
 8  
 9  #define LED_PIN    8
10  #define LED_COUNT  4
11  Adafruit_NeoPixel strip(LED_COUNT, LED_PIN, NEO_GRB + NEO_KHZ800);
12  
13  void user_setup(void) {
14    strip.begin();           // INITIALIZE NeoPixel strip object (REQUIRED)
15    strip.show();            // Turn OFF all pixels ASAP
16    strip.setBrightness(50); // Set BRIGHTNESS to about 1/5 (max = 255)
17  }
18  
19  long firstPixelHue = 0;
20  
21  void user_loop(void) {
22    for(int i=0; i<strip.numPixels(); i++) { // For each pixel in strip...
23      // Offset pixel hue by an amount to make one full revolution of the
24      // color wheel (range of 65536) along the length of the strip
25      // (strip.numPixels() steps):
26      int pixelHue = firstPixelHue + (i * 65536L / strip.numPixels());
27      // strip.ColorHSV() can take 1 or 3 arguments: a hue (0 to 65535) or
28      // optionally add saturation and value (brightness) (each 0 to 255).
29      // Here we're using just the single-argument hue variant. The result
30      // is passed through strip.gamma32() to provide 'truer' colors
31      // before assigning to each pixel:
32      strip.setPixelColor(i, strip.gamma32(strip.ColorHSV(pixelHue)));
33    }
34    strip.show(); // Update strip with new contents
35    firstPixelHue += 256;
36  }
37  
38  #endif // 0