1  // SPDX-FileCopyrightText: 2018 Mikey Sklar for Adafruit Industries
  2  //
  3  // SPDX-License-Identifier: MIT
  4  
  5  #include <FastLED.h>
  6  
  7  #define LED_PIN      1   // which pin your pixels are connected to
  8  #define NUM_LEDS    78   // how many LEDs you have
  9  #define BRIGHTNESS 200   // 0-255, higher number is brighter. 
 10  #define SATURATION 255   // 0-255, 0 is pure white, 255 is fully saturated color
 11  #define SPEED       10   // How fast the colors move.  Higher numbers = faster motion
 12  #define STEPS        2   // How wide the bands of color are.  1 = more like a gradient, 10 = more like stripes
 13  #define BUTTON_PIN   2   // button is connected to pin 2 and GND
 14  
 15  #define COLOR_ORDER GRB  // Try mixing up the letters (RGB, GBR, BRG, etc) for a whole new world of color combinations
 16  
 17  CRGB leds[NUM_LEDS];
 18  CRGBPalette16 currentPalette;
 19  CRGBPalette16 targetPalette( PartyColors_p );
 20  TBlendType    currentBlending;
 21  int ledMode = 0;
 22  
 23  
 24  //FastLED comes with several palettes pre-programmed.  I like purple a LOT, and so I added a custom purple palette.
 25  
 26  const TProgmemPalette16 PurpleColors_p PROGMEM =
 27  {
 28    CRGB::Purple,
 29    CRGB::Purple, 
 30    CRGB::MidnightBlue,
 31    CRGB::MidnightBlue,
 32  
 33    CRGB::Purple,
 34    CRGB::Purple,
 35    CRGB::BlueViolet,
 36    CRGB::BlueViolet,
 37  
 38    CRGB::DarkTurquoise,
 39    CRGB::DarkTurquoise,
 40    CRGB::DarkBlue,
 41    CRGB::DarkBlue,
 42  
 43    CRGB::Purple,
 44    CRGB::Purple,
 45    CRGB::BlueViolet,
 46    CRGB::BlueViolet
 47  };
 48  
 49  
 50  unsigned long keyPrevMillis = 0;
 51  const unsigned long keySampleIntervalMs = 25;
 52  byte longKeyPressCountMax = 80;    // 80 * 25 = 2000 ms
 53  byte longKeyPressCount = 0;
 54  
 55  byte prevKeyState = HIGH;         // button is active low
 56  
 57  void setup() {
 58    delay( 2000 ); // power-up safety delay
 59    FastLED.addLeds<WS2812B, LED_PIN, COLOR_ORDER>(leds, NUM_LEDS).setCorrection( TypicalLEDStrip );
 60    FastLED.setBrightness(  BRIGHTNESS );
 61    currentBlending =LINEARBLEND;
 62    pinMode(BUTTON_PIN, INPUT_PULLUP);
 63  }
 64  
 65  void loop() {
 66  
 67    byte currKeyState = digitalRead(BUTTON_PIN);
 68  
 69    if ((prevKeyState == LOW) && (currKeyState == HIGH)) {
 70      shortKeyPress();
 71    }
 72    prevKeyState = currKeyState;
 73  
 74    static uint8_t startIndex = 0;
 75    startIndex = startIndex + 1; /* motion speed */
 76  
 77    switch (ledMode) {
 78  
 79    case 0:
 80      currentPalette = HeatColors_p;    //Red & Yellow, Fire Colors
 81      break;
 82    case 1:
 83      currentPalette = ForestColors_p;    //Foresty greens and yellows
 84      break;
 85    case 2: 
 86      currentPalette = OceanColors_p;  //Oceans are pretty and filled with mermaids
 87      break;
 88    case 3: 
 89      currentPalette = PurpleColors_p;  //My custom palette from above
 90      break;
 91    case 4:
 92      currentPalette = RainbowColors_p;  //All the colors!
 93      break;
 94    case 5:
 95      currentPalette = RainbowStripeColors_p;   //Rainbow stripes
 96      break;      
 97    case 6:
 98      currentPalette = PartyColors_p; //All the colors except the greens, which make people look a bit washed out
 99      break;
100    } 
101  
102    FillLEDsFromPaletteColors( startIndex);
103    FastLED.show();
104    FastLED.delay(1000 / SPEED);  
105  }
106  
107  void FillLEDsFromPaletteColors( uint8_t colorIndex) {
108    for( int i = 0; i < NUM_LEDS; i++) {
109      leds[i] = ColorFromPalette( currentPalette, colorIndex, BRIGHTNESS, currentBlending);
110      colorIndex += STEPS;              
111    }
112  }
113  
114  void shortKeyPress() {
115    ledMode++;
116    if (ledMode > 6) {
117      ledMode=0; 
118    }  
119  }