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View NeoPixel Ripple
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#include <Adafruit_NeoPixel.h>
 
#define PIN 2
#define Pixels 24
#define BG 1
 
// Parameter 1 = number of pixels in strip
// Parameter 2 = Arduino pin number (most are valid)
// Parameter 3 = pixel type flags, add together as needed:
// NEO_KHZ800 800 KHz bitstream (most NeoPixel products w/WS2812 LEDs)
// NEO_KHZ400 400 KHz (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
// NEO_GRB Pixels are wired for GRB bitstream (most NeoPixel products)
// NEO_RGB Pixels are wired for RGB bitstream (v1 FLORA pixels, not v2)
Adafruit_NeoPixel strip = Adafruit_NeoPixel(Pixels, PIN, NEO_GRB + NEO_KHZ800);
 
// IMPORTANT: To reduce NeoPixel burnout risk, add 1000 uF capacitor across
// pixel power leads, add 300 - 500 Ohm resistor on first pixel's data input
// and minimize distance between Arduino and first pixel. Avoid connecting
// on a live circuit...if you must, connect GND first.
 
int color;
int center = 0;
int step = -1;
int maxSteps = 16;
float fadeRate = 0.6;
int diff;
 
//background color
uint32_t currentBg = random(256);
uint32_t nextBg = currentBg;
 
void setup() {
strip.begin();
strip.show(); // Initialize all pixels to 'off'
}
 
void loop () {
ripple();
}
 
void ripple() {
if (BG){
if (currentBg == nextBg) {
nextBg = random(256);
}
else if (nextBg > currentBg) {
currentBg++;
} else {
currentBg--;
}
for(uint16_t l = 0; l < Pixels; l++) {
strip.setPixelColor(l, Wheel(currentBg, 0.1));
}
} else {
for(uint16_t l = 0; l < Pixels; l++) {
strip.setPixelColor(l, 0, 0, 0);
}
}
 
 
if (step == -1) {
center = random(Pixels);
color = random(256);
step = 0;
}
 
 
 
if (step == 0) {
strip.setPixelColor(center, Wheel(color, 1));
step ++;
}
else {
if (step < maxSteps) {
strip.setPixelColor(wrap(center + step), Wheel(color, pow(fadeRate, step)));
strip.setPixelColor(wrap(center - step), Wheel(color, pow(fadeRate, step)));
if (step > 3) {
strip.setPixelColor(wrap(center + step - 3), Wheel(color, pow(fadeRate, step - 2)));
strip.setPixelColor(wrap(center - step + 3), Wheel(color, pow(fadeRate, step - 2)));
}
step ++;
}
else {
step = -1;
}
}
strip.show();
delay(50);
}
 
 
int wrap(int step) {
if(step < 0) return Pixels + step;
if(step > Pixels - 1) return step - Pixels;
return step;
}
 
 
 
// Input a value 0 to 255 to get a color value.
// The colours are a transition r - g - b - back to r.
uint32_t Wheel(byte WheelPos, float opacity) {
if(WheelPos < 85) {
return strip.Color((WheelPos * 3) * opacity, (255 - WheelPos * 3) * opacity, 0);
}
else if(WheelPos < 170) {
WheelPos -= 85;
return strip.Color((255 - WheelPos * 3) * opacity, 0, (WheelPos * 3) * opacity);
}
else {
WheelPos -= 170;
return strip.Color(0, (WheelPos * 3) * opacity, (255 - WheelPos * 3) * opacity);
}
}
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