#include <Adafruit_NeoPixel.h>
#define BUTTON_PIN 2
#define PIXEL_PIN 9
#define PIXEL_COUNT (16*3)
// Parameter 1 = number of pixels in strip, neopixel stick has 8
// Parameter 2 = pin number (most are valid)
// Parameter 3 = pixel type flags, add together as needed:
// NEO_RGB Pixels are wired for RGB bitstream
// NEO_GRB Pixels are wired for GRB bitstream, correct for neopixel stick
// NEO_KHZ400 400 KHz bitstream (e.g. FLORA pixels)
// NEO_KHZ800 800 KHz bitstream (e.g. High Density LED strip), correct for neopixel stick
Adafruit_NeoPixel strip = Adafruit_NeoPixel(PIXEL_COUNT, PIXEL_PIN, NEO_RGB + NEO_KHZ800);
void setup() {
pinMode(BUTTON_PIN, INPUT_PULLUP);
strip.begin();
strip.show(); // Initialize all pixels to 'off'
}
void loop() {
while (digitalRead(BUTTON_PIN) == LOW) {
rainbowCycle(2);
}
ringOff(0);
}
// Slightly different, this makes the rainbow equally distributed throughout
void rainbowCycle(uint8_t wait) {
uint16_t i, j;
for(j=0; j<256; j++) {
for(i=0; i< strip.numPixels(); i++) {
strip.setPixelColor(i, Wheel(((i * 256 / strip.numPixels()) + j) & 255));
}
strip.show();
}
}
// Blink all and switch colors
void ringOff(uint8_t wait) {
uint16_t i, j;
for(j=0; j<255; j++) {
for(i=0; i< strip.numPixels(); i++) {
strip.setPixelColor(i, Wheel(((i * 0 / strip.numPixels()) + j) & 255));
}
strip.show();
}
}
// 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) {
WheelPos = 255 - WheelPos;
if(WheelPos < 85) {
return strip.Color(255 - WheelPos * 3, 0, WheelPos * 3);
}
if(WheelPos < 170) {
WheelPos -= 85;
return strip.Color(0, WheelPos * 3, 255 - WheelPos * 3);
}
WheelPos -= 170;
return strip.Color(WheelPos * 3, 255 - WheelPos * 3, 0);
}