108 lines
4.4 KiB
C++
108 lines
4.4 KiB
C++
/* Plasma
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*
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* By: Andrew Tuline
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*
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* Date: July, 2017
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*
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* This demonstrates 2D sinusoids in 1D using 16 bit math.
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*
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* It runs at about 450 fps on an Arduino Nano with 60 APA102's. That would be FAST.
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*
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*
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* References:
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*
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* https://www.bidouille.org/prog/plasma
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* http://lodev.org/cgtutor/plasma.html
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*
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*/
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// Use qsuba for smooth pixel colouring and qsubd for non-smooth pixel colouring
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#define qsubd(x, b) ((x>b)?b:0) // Digital unsigned subtraction macro. if result <0, then => 0. Otherwise, take on fixed value.
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#define qsuba(x, b) ((x>b)?x-b:0) // Analog Unsigned subtraction macro. if result <0, then => 0
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#include "FastLED.h" // FastLED library. Preferably the latest copy of FastLED 2.1.
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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 // Serial data pin for WS2812 or WS2801.
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#define LED_CK 11 // Serial clock pin for WS2801 or APA102.
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#define COLOR_ORDER BGR // Are they GRB for WS2812 and GBR for APA102
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#define LED_TYPE APA102 // What kind of strip are you using? WS2812, APA102. . .
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#define NUM_LEDS 60 // Number of LED's.
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uint8_t max_bright = 255; // Overall brightness definition. It can be changed on the fly.
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struct CRGB leds[NUM_LEDS]; // Initialize our LED array.
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CRGBPalette16 currentPalette; // Palette definitions
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CRGBPalette16 targetPalette;
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TBlendType currentBlending = LINEARBLEND;
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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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LEDS.addLeds<LED_TYPE, LED_DT, LED_CK, COLOR_ORDER>(leds, NUM_LEDS); //WS2801 and APA102
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// LEDS.addLeds<LED_TYPE, LED_DT,COLOR_ORDER>(leds, NUM_LEDS); // WS2812
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FastLED.setBrightness(max_bright);
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set_max_power_in_volts_and_milliamps(5, 500); // FastLED Power management set at 5V, 500mA.
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currentPalette = OceanColors_p;
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} // setup()
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void loop () {
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EVERY_N_MILLISECONDS(50) { // FastLED based non-blocking delay to update/display the sequence.
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plasma();
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}
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EVERY_N_MILLISECONDS(1000) {
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Serial.println(LEDS.getFPS()); // Optional check of our fps.
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}
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EVERY_N_MILLISECONDS(100) {
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uint8_t maxChanges = 24;
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nblendPaletteTowardPalette(currentPalette, targetPalette, maxChanges); // AWESOME palette blending capability.
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}
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EVERY_N_SECONDS(5) { // Change the target palette to a random one every 5 seconds.
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uint8_t baseC = random8(); // You can use this as a baseline colour if you want similar hues in the next line.
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targetPalette = CRGBPalette16(CHSV(baseC+random8(32), 192, random8(128,255)), CHSV(baseC+random8(32), 255, random8(128,255)), CHSV(baseC+random8(32), 192, random8(128,255)), CHSV(baseC+random8(32), 255, random8(128,255)));
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}
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FastLED.show();
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} // loop()
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void plasma() { // This is the heart of this program. Sure is short. . . and fast.
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int thisPhase = beatsin8(6,-64,64); // Setting phase change for a couple of waves.
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int thatPhase = beatsin8(7,-64,64);
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for (int k=0; k<NUM_LEDS; k++) { // For each of the LED's in the strand, set a brightness based on a wave as follows:
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int colorIndex = cubicwave8((k*23)+thisPhase)/2 + cos8((k*15)+thatPhase)/2; // Create a wave and add a phase change and add another wave with its own phase change.. Hey, you can even change the frequencies if you wish.
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int thisBright = qsuba(colorIndex, beatsin8(7,0,96)); // qsub gives it a bit of 'black' dead space by setting sets a minimum value. If colorIndex < current value of beatsin8(), then bright = 0. Otherwise, bright = colorIndex..
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leds[k] = ColorFromPalette(currentPalette, colorIndex, thisBright, currentBlending); // Let's now add the foreground colour.
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}
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} // plasma()
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