129 lines
3.6 KiB
Arduino
129 lines
3.6 KiB
Arduino
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/* serendipitous
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*
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* By: Andrew Tuline
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*
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* Date: August, 2016
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*
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* This is from the Serendipitous Circles article in the August 1977 and April 1978 issues of Byte Magazine. This is a poorly rendered 1D version and I really should get around to converting it to 2D and buying a 32x32 matrix to display it. Some day . .
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*
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* Check the magazine article out online, as this 1D routine doesn't do it justice.
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*
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*
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* Base Routine is:
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*
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* Choose X, Y
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* Top: Display point
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* Xn = X-Y/2
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* Yn = Y+Xn/2
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* X = Xn
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* Y = Yn
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* Goto top
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*
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* Other maths are:
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* Xn = X-Y/2, Yn = Y+Xn/2
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* Xn = X-(Y/2), Yn = Y+(X/2.1)
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* Xn = X-(Y/3), Yn = Y+(X/1.5)
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* Xn = X-(2*Y), Yn = Y+(X/1.1)
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*
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*/
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#include "FastLED.h" // FastLED library. Please use the latest development version.
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#if FASTLED_VERSION < 3001000
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#error "Requires FastLED 3.1 or later; check github for latest code."
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#endif
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// Fixed definitions cannot change on the fly.
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#define LED_DT 12 // Data pin to connect to the strip.
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#define LED_CK 11 // Clock pin for WS2801 or APA102.
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#define COLOR_ORDER BGR // Are they GRB for WS2812 and BGR for APA102.
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#define LED_TYPE APA102 // Using APA102, WS2812, WS2801. Don't forget to change LEDS.addLeds.
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#define NUM_LEDS 60 // Number of LED's.
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uint8_t brightness = 255;
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CRGB leds[NUM_LEDS];
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uint8_t maxChanges = 24; // Value for blending between palettes.
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CRGBPalette16 currentPalette;
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CRGBPalette16 targetPalette;
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TBlendType currentBlending; // NOBLEND or LINEARBLEND
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uint16_t Xorig = 0x012;
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uint16_t Yorig = 0x015;
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uint16_t X;
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uint16_t Y;
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uint16_t Xn;
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uint16_t Yn;
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uint8_t index;
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void setup () {
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Serial.begin(57600); // Initialize serial port for debugging.
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delay(1000); // Soft startup to ease the flow of electrons.
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FastLED.addLeds<LED_TYPE, LED_DT, LED_CK, COLOR_ORDER>(leds, NUM_LEDS); // WS2801 and APA102
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// FastLED.addLeds<LED_TYPE, LED_DT, COLOR_ORDER>(leds, NUM_LEDS); // WS2812
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FastLED.setBrightness(brightness);
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currentBlending = LINEARBLEND;
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X=Xorig;
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Y=Yorig;
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} // setup()
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void loop () {
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EVERY_N_MILLISECONDS(60) {
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nblendPaletteTowardPalette(currentPalette, targetPalette, maxChanges); // Blend towards the target palette
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}
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EVERY_N_MILLISECONDS(50) {
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serendipitous();
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}
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LEDS.show();
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} // loop()
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void serendipitous () {
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EVERY_N_SECONDS(5) {
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uint8_t baseC = random8();
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targetPalette = CRGBPalette16(CHSV(baseC-3, 255, random8(192,255)), CHSV(baseC+2, 255, random8(192,255)), CHSV(baseC+5, 192, random8(192,255)), CHSV(random8(), 255, random8(192,255)));
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X = Xorig;
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Y = Yorig;
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}
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// Xn = X-(Y/2); Yn = Y+(Xn/2);
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// Xn = X-Y/2; Yn = Y+Xn/2;
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// Xn = X-(Y/2); Yn = Y+(X/2.1);
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Xn = X-(Y/3); Yn = Y+(X/1.5);
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// Xn = X-(2*Y); Yn = Y+(X/1.1);
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X = Xn;
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Y = Yn;
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index=(sin8(X)+cos8(Y))/2; // Guarantees maximum value of 255
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CRGB newcolor = ColorFromPalette(currentPalette, index, 255, LINEARBLEND);
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// nblend(leds[X%NUM_LEDS-1], newcolor, 224); // Try and smooth it out a bit. Higher # means less smoothing.
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nblend(leds[map(X,0,65535,0,NUM_LEDS)], newcolor, 224); // Try and smooth it out a bit. Higher # means less smoothing.
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fadeToBlackBy(leds, NUM_LEDS, 16); // 8 bit, 1 = slow, 255 = fast
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} // serendipitous()
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