106 lines
3.3 KiB
C++
106 lines
3.3 KiB
C++
#include <FastLED.h>
|
|
|
|
#define LED_PIN 5
|
|
#define COLOR_ORDER GRB
|
|
#define CHIPSET WS2811
|
|
#define NUM_LEDS 30
|
|
|
|
#define BRIGHTNESS 200
|
|
#define FRAMES_PER_SECOND 60
|
|
|
|
bool gReverseDirection = false;
|
|
|
|
CRGB leds[NUM_LEDS];
|
|
|
|
void setup() {
|
|
delay(3000); // sanity delay
|
|
FastLED.addLeds<CHIPSET, LED_PIN, COLOR_ORDER>(leds, NUM_LEDS).setCorrection( TypicalLEDStrip );
|
|
FastLED.setBrightness( BRIGHTNESS );
|
|
}
|
|
|
|
void loop()
|
|
{
|
|
// Add entropy to random number generator; we use a lot of it.
|
|
// random16_add_entropy( random());
|
|
|
|
Fire2012(); // run simulation frame
|
|
|
|
FastLED.show(); // display this frame
|
|
FastLED.delay(1000 / FRAMES_PER_SECOND);
|
|
}
|
|
|
|
|
|
// Fire2012 by Mark Kriegsman, July 2012
|
|
// as part of "Five Elements" shown here: http://youtu.be/knWiGsmgycY
|
|
////
|
|
// This basic one-dimensional 'fire' simulation works roughly as follows:
|
|
// There's a underlying array of 'heat' cells, that model the temperature
|
|
// at each point along the line. Every cycle through the simulation,
|
|
// four steps are performed:
|
|
// 1) All cells cool down a little bit, losing heat to the air
|
|
// 2) The heat from each cell drifts 'up' and diffuses a little
|
|
// 3) Sometimes randomly new 'sparks' of heat are added at the bottom
|
|
// 4) The heat from each cell is rendered as a color into the leds array
|
|
// The heat-to-color mapping uses a black-body radiation approximation.
|
|
//
|
|
// Temperature is in arbitrary units from 0 (cold black) to 255 (white hot).
|
|
//
|
|
// This simulation scales it self a bit depending on NUM_LEDS; it should look
|
|
// "OK" on anywhere from 20 to 100 LEDs without too much tweaking.
|
|
//
|
|
// I recommend running this simulation at anywhere from 30-100 frames per second,
|
|
// meaning an interframe delay of about 10-35 milliseconds.
|
|
//
|
|
// Looks best on a high-density LED setup (60+ pixels/meter).
|
|
//
|
|
//
|
|
// There are two main parameters you can play with to control the look and
|
|
// feel of your fire: COOLING (used in step 1 above), and SPARKING (used
|
|
// in step 3 above).
|
|
//
|
|
// COOLING: How much does the air cool as it rises?
|
|
// Less cooling = taller flames. More cooling = shorter flames.
|
|
// Default 50, suggested range 20-100
|
|
#define COOLING 55
|
|
|
|
// SPARKING: What chance (out of 255) is there that a new spark will be lit?
|
|
// Higher chance = more roaring fire. Lower chance = more flickery fire.
|
|
// Default 120, suggested range 50-200.
|
|
#define SPARKING 120
|
|
|
|
|
|
void Fire2012()
|
|
{
|
|
// Array of temperature readings at each simulation cell
|
|
static byte heat[NUM_LEDS];
|
|
|
|
// Step 1. Cool down every cell a little
|
|
for( int i = 0; i < NUM_LEDS; i++) {
|
|
heat[i] = qsub8( heat[i], random8(0, ((COOLING * 10) / NUM_LEDS) + 2));
|
|
}
|
|
|
|
// Step 2. Heat from each cell drifts 'up' and diffuses a little
|
|
for( int k= NUM_LEDS - 1; k >= 2; k--) {
|
|
heat[k] = (heat[k - 1] + heat[k - 2] + heat[k - 2] ) / 3;
|
|
}
|
|
|
|
// Step 3. Randomly ignite new 'sparks' of heat near the bottom
|
|
if( random8() < SPARKING ) {
|
|
int y = random8(7);
|
|
heat[y] = qadd8( heat[y], random8(160,255) );
|
|
}
|
|
|
|
// Step 4. Map from heat cells to LED colors
|
|
for( int j = 0; j < NUM_LEDS; j++) {
|
|
CRGB color = HeatColor( heat[j]);
|
|
int pixelnumber;
|
|
if( gReverseDirection ) {
|
|
pixelnumber = (NUM_LEDS-1) - j;
|
|
} else {
|
|
pixelnumber = j;
|
|
}
|
|
leds[pixelnumber] = color;
|
|
}
|
|
}
|
|
|