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#include <Adafruit_NeoPixel.h>
#ifdef __AVR_ATtiny85__ // Trinket, Gemma, etc.
#include <avr/power.h>
#endif
#define PIN 1
#define Pixels 3
// 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.
float fadeRate = 20;
int MaxBrightness = 120;
void setup() {
#ifdef __AVR_ATtiny85__ // Trinket, Gemma, etc.
if (F_CPU == 16000000) clock_prescale_set(clock_div_1);
#endif
strip.begin();
for (int i = 0; i < Pixels; i++)
{
strip.setPixelColor(i, random(0, MaxBrightness), random(0, MaxBrightness), random(0, MaxBrightness));
}
strip.show(); // Initialize all pixels to a Random Color.
}
void loop () {
int redCur;
int redNew;
int blueCur;
int blueNew;
int greenCur;
int greenNew;
if (random(40) == 1) // Wait random time to start changing next pixel
{
uint16_t i = random(Pixels); // Pick a random pixel
// Get the colors of the current pixel.
uint16_t c = strip.getPixelColor(i);
uint8_t redCur = (uint8_t)(c >> 16);
uint8_t greenCur = (uint8_t)(c >> 8);
uint8_t blueCur = (uint8_t)c;
//Pick a new random color
uint8_t redNew = random(0, MaxBrightness);
uint8_t greenNew = random(0, MaxBrightness);
uint8_t blueNew = random(0, MaxBrightness);
// Start fade between the two colors
while (redCur != redNew && greenCur != greenNew && blueCur != blueNew)
{
if (redNew > redCur) {
redCur++;
}
else if (redNew < redCur) {
redCur--;
}
if (greenNew > greenCur) {
greenCur++;
}
else if (greenNew < greenCur) {
greenCur--;
}
if (blueNew > blueCur) {
blueCur++;
}
else if (blueNew < blueCur) {
blueCur--;
}
// Sets the pixel to the color adjusted in the fade
strip.setPixelColor(i, greenCur, blueCur, redCur);
strip.show();
delay(fadeRate);
}
}
}