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LED Strip Pattern Collection
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=LED Strip Pattern Collelction= Example code for use with LED controllers to make cool patterns. Note: Some of these may be written specifically for octows2811, neopixel or fastSPI, but it's usually easy to port between them (change the show and set color functions). Try the [https://noisebridge.net/wiki/Talk:Light_Patterns_with_LEDs_and_Arduino#Patterns LED talk page] for some great outside links! === Random Twinkle === <pre> // number, twinkle color, background color, delay // twinkleRand(5,strip.Color(255,255,255),strip.Color(255, 0, 100),90); // twinkle random number of pixels void twinkleRand(int num,uint32_t c,uint32_t bg,int wait) { // set background stripSet(bg,0); // for each num for (int i=0; i<num; i++) { strip.setPixelColor(random(strip.numPixels()),c); } strip.show(); delay(wait); } </pre> === Set All Pixels Quickly === <pre> // quickly set the entire strip a color void stripSet(uint32_t c, uint8_t wait) { for(uint16_t i=0; i<strip.numPixels(); i++) { strip.setPixelColor(i, c); } // move the show outside the loop strip.show(); delay(wait); } </pre> === Simple Wave === <pre> // very simple wave: velocity, cycles,delay between frames // simpleWave(0.03,5,10); void simpleWave(float rate,int cycles, int wait) { float pos=0.0; // cycle through x times for(int x=0; x<(strip.numPixels()*cycles); x++) { pos = pos+rate; for(int i=0; i<strip.numPixels(); i++) { // sine wave, 3 offset waves make a rainbow! float level = sin(i+pos) * 127 + 128; // set color level strip.setPixelColor(i,(int)level,0,0); } strip.show(); delay(wait); } } </pre> === HSV to RGB === Really useful function returns RGB values from Hue Saturation Brightness! From teldredge's [http://funkboxing.com/wordpress/wp-content/_postfiles/sk_qLEDFX_POST.ino FAST_SPI LED FX EXAMPLES] <pre> void HSVtoRGB(int hue, int sat, int val,int *colors) { int r, g, b, base; // hue: 0-359, sat: 0-255, val (lightness): 0-255 if (sat == 0) { // Achromatic color (gray). colors[0]=val; colors[1]=val; colors[2]=val; } else { base = ((255 - sat) * val)>>8; switch(hue/60) { case 0: colors[0] = val; colors[1] = (((val-base)*hue)/60)+base; colors[2] = base; break; case 1: colors[0] = (((val-base)*(60-(hue%60)))/60)+base; colors[1] = val; colors[2] = base; break; case 2: colors[0] = base; colors[1] = val; colors[2] = (((val-base)*(hue%60))/60)+base; break; case 3: colors[0] = base; colors[1] = (((val-base)*(60-(hue%60)))/60)+base; colors[2] = val; break; case 4: colors[0] = (((val-base)*(hue%60))/60)+base; colors[1] = base; colors[2] = val; break; case 5: colors[0] = val; colors[1] = base; colors[2] = (((val-base)*(60-(hue%60)))/60)+base; break; } } } </pre>
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