NeoPixel Workshop Instructions
This is the instruction page for the NeoPixel Workshop ran by Andy Miller on 11/11/17
Contents
Software to install
You will need to install the following programs and drivers
Download and install the Arduino IDE V 1.8.5 (or newer).
Do not download/install the web IDE!
https://www.arduino.cc/en/Main/Software
There are some step by step instructions here: https://www.arduino.cc/en/Guide/HomePage
Download and install the CH340 USB drivers for the Arduino clones:
https://sparks.gogo.co.nz/ch340.html
Note: The CH340 chip is a USB to serial chip used frequently on Arduino clones. Official Arduinos use the FTDI chip. Those drivers are included in the Arduino software install.
Download the FastLED library from:
https://github.com/FastLED/FastLED/releases Current version is 3.1.6
We will show you how to install this library. The FastLED library is used to control NeoPixels! The official page for the FASTLED library is:
https://github.com/FastLED/FastLED/tree/v3.1.6
Code
Color Pallet.ino
#include <FastLED.h>
#define LED_PIN 6
#define NUM_LEDS 60
#define BRIGHTNESS 96
#define LED_TYPE WS2811
#define COLOR_ORDER GRB
CRGB leds[NUM_LEDS];
#define UPDATES_PER_SECOND 100
// FastLED provides a few pre-configured color palettes, and makes it
// extremely easy to make up your own color schemes with palettes.
//
// Some notes on the more abstract 'theory and practice' of
// FastLED compact palettes are at the bottom of this file.
CRGBPalette16 currentPalette;
TBlendType currentBlending;
extern CRGBPalette16 myRedWhiteBluePalette;
extern const TProgmemPalette16 myRedWhiteBluePalette_p PROGMEM;
void setup() {
delay( 3000 ); // power-up safety delay
FastLED.addLeds<LED_TYPE, LED_PIN, COLOR_ORDER>(leds, NUM_LEDS).setCorrection( TypicalLEDStrip );
FastLED.setBrightness( BRIGHTNESS );
currentPalette = RainbowColors_p;
currentBlending = LINEARBLEND;
}
void loop()
{
ChangePalettePeriodically();
static uint8_t startIndex = 0;
startIndex = startIndex + 1; /* motion speed */
FillLEDsFromPaletteColors( startIndex);
FastLED.show();
FastLED.delay(1000 / UPDATES_PER_SECOND);
}
void FillLEDsFromPaletteColors( uint8_t colorIndex)
{
uint8_t brightness = 255;
for( int i = 0; i < NUM_LEDS; i++) {
leds[i] = ColorFromPalette( currentPalette, colorIndex, brightness, currentBlending);
colorIndex += 3;
}
}
void ChangePalettePeriodically()
{
uint8_t secondHand = (millis() / 1000) % 60;
static uint8_t lastSecond = 99;
if( lastSecond != secondHand) {
lastSecond = secondHand;
if( secondHand == 0) { currentPalette = RainbowColors_p; currentBlending = LINEARBLEND; }
if( secondHand == 10) { currentPalette = RainbowStripeColors_p; currentBlending = NOBLEND; }
if( secondHand == 15) { currentPalette = RainbowStripeColors_p; currentBlending = LINEARBLEND; }
if( secondHand == 20) { SetupPurpleAndGreenPalette(); currentBlending = LINEARBLEND; }
if( secondHand == 25) { SetupTotallyRandomPalette(); currentBlending = LINEARBLEND; }
if( secondHand == 30) { SetupBlackAndWhiteStripedPalette(); currentBlending = NOBLEND; }
if( secondHand == 35) { SetupBlackAndWhiteStripedPalette(); currentBlending = LINEARBLEND; }
if( secondHand == 40) { currentPalette = CloudColors_p; currentBlending = LINEARBLEND; }
if( secondHand == 45) { currentPalette = PartyColors_p; currentBlending = LINEARBLEND; }
if( secondHand == 50) { currentPalette = myRedWhiteBluePalette_p; currentBlending = NOBLEND; }
if( secondHand == 55) { currentPalette = myRedWhiteBluePalette_p; currentBlending = LINEARBLEND; }
}
}
// This function fills the palette with totally random colors.
void SetupTotallyRandomPalette()
{
for( int i = 0; i < 16; i++) {
currentPalette[i] = CHSV( random8(), 255, random8());
}
}
// This function sets up a palette of black and white stripes,
// using code. Since the palette is effectively an array of
// sixteen CRGB colors, the various fill_* functions can be used
// to set them up.
void SetupBlackAndWhiteStripedPalette()
{
// 'black out' all 16 palette entries...
fill_solid( currentPalette, 16, CRGB::Black);
// and set every fourth one to white.
currentPalette[0] = CRGB::White;
currentPalette[4] = CRGB::White;
currentPalette[8] = CRGB::White;
currentPalette[12] = CRGB::White;
}
// This function sets up a palette of purple and green stripes.
void SetupPurpleAndGreenPalette()
{
CRGB purple = CHSV( HUE_PURPLE, 255, 255);
CRGB green = CHSV( HUE_GREEN, 255, 255);
CRGB black = CRGB::Black;
currentPalette = CRGBPalette16(
green, green, black, black,
purple, purple, black, black,
green, green, black, black,
purple, purple, black, black );
}
// This example shows how to set up a static color palette
// which is stored in PROGMEM (flash), which is almost always more
// plentiful than RAM. A static PROGMEM palette like this
// takes up 64 bytes of flash.
const TProgmemPalette16 myRedWhiteBluePalette_p PROGMEM =
{
CRGB::Red,
CRGB::Gray, // 'white' is too bright compared to red and blue
CRGB::Blue,
CRGB::Black,
CRGB::Red,
CRGB::Gray,
CRGB::Blue,
CRGB::Black,
CRGB::Red,
CRGB::Red,
CRGB::Gray,
CRGB::Gray,
CRGB::Blue,
CRGB::Blue,
CRGB::Black,
CRGB::Black
};
Demo Reel.ino
#include "FastLED.h"
#if defined(FASTLED_VERSION) && (FASTLED_VERSION < 3001000)
#warning "Requires FastLED 3.1 or later; check github for latest code."
#endif
#define DATA_PIN 6
#define LED_TYPE WS2811
#define COLOR_ORDER GRB
#define NUM_LEDS 60
CRGB leds[NUM_LEDS];
#define BRIGHTNESS 96
#define FRAMES_PER_SECOND 80
void setup() {
delay(3000); // 3 second delay for recovery
// tell FastLED about the LED strip configuration
FastLED.addLeds<LED_TYPE,DATA_PIN,COLOR_ORDER>(leds, NUM_LEDS).setCorrection(TypicalLEDStrip);
//FastLED.addLeds<LED_TYPE,DATA_PIN,CLK_PIN,COLOR_ORDER>(leds, NUM_LEDS).setCorrection(TypicalLEDStrip);
// set master brightness control
FastLED.setBrightness(BRIGHTNESS);
}
// List of patterns to cycle through. Each is defined as a separate function below.
typedef void (*SimplePatternList[])();
SimplePatternList gPatterns = { rainbow, rainbowWithGlitter, confetti, sinelon, juggle, bpm };
uint8_t gCurrentPatternNumber = 0; // Index number of which pattern is current
uint8_t gHue = 0; // rotating "base color" used by many of the patterns
void loop()
{
// Call the current pattern function once, updating the 'leds' array
gPatterns[gCurrentPatternNumber]();
// send the 'leds' array out to the actual LED strip
FastLED.show();
// insert a delay to keep the framerate modest
FastLED.delay(1000/FRAMES_PER_SECOND);
// do some periodic updates
EVERY_N_MILLISECONDS( 20 ) { gHue++; } // slowly cycle the "base color" through the rainbow
EVERY_N_SECONDS( 10 ) { nextPattern(); } // change patterns periodically
}
#define ARRAY_SIZE(A) (sizeof(A) / sizeof((A)[0]))
void nextPattern()
{
// add one to the current pattern number, and wrap around at the end
gCurrentPatternNumber = (gCurrentPatternNumber + 1) % ARRAY_SIZE( gPatterns);
}
void rainbow()
{
// FastLED's built-in rainbow generator
fill_rainbow( leds, NUM_LEDS, gHue, 7);
}
void rainbowWithGlitter()
{
// built-in FastLED rainbow, plus some random sparkly glitter
rainbow();
addGlitter(80);
}
void addGlitter( fract8 chanceOfGlitter)
{
if( random8() < chanceOfGlitter) {
leds[ random16(NUM_LEDS) ] += CRGB::White;
}
}
void confetti()
{
// random colored speckles that blink in and fade smoothly
fadeToBlackBy( leds, NUM_LEDS, 10);
int pos = random16(NUM_LEDS);
leds[pos] += CHSV( gHue + random8(64), 200, 255);
}
void sinelon()
{
// a colored dot sweeping back and forth, with fading trails
fadeToBlackBy( leds, NUM_LEDS, 20);
int pos = beatsin16( 13, 0, NUM_LEDS-1 );
leds[pos] += CHSV( gHue, 255, 192);
}
void bpm()
{
// colored stripes pulsing at a defined Beats-Per-Minute (BPM)
uint8_t BeatsPerMinute = 62;
CRGBPalette16 palette = PartyColors_p;
uint8_t beat = beatsin8( BeatsPerMinute, 64, 255);
for( int i = 0; i < NUM_LEDS; i++) { //9948
leds[i] = ColorFromPalette(palette, gHue+(i*2), beat-gHue+(i*10));
}
}
void juggle() {
// eight colored dots, weaving in and out of sync with each other
fadeToBlackBy( leds, NUM_LEDS, 20);
byte dothue = 0;
for( int i = 0; i < 8; i++) {
leds[beatsin16( i+7, 0, NUM_LEDS-1 )] |= CHSV(dothue, 200, 255);
dothue += 32;
}
}
Fire Nash.ino
#include <Adafruit_NeoPixel.h>
#define PIN 6
#define NUM_LEDS 144
// Parameter 1 = number of pixels in strip
// Parameter 2 = 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(NUM_LEDS, PIN, NEO_GRB + NEO_KHZ800);
void setup() {
strip.begin();
strip.show(); // Initialize all pixels to 'off'
}
// *** REPLACE FROM HERE ***
void loop() {
Fire(55,120,15);
}
void Fire(int Cooling, int Sparking, int SpeedDelay) {
static byte heat[NUM_LEDS];
int cooldown;
// Step 1. Cool down every cell a little
for( int i = 0; i < NUM_LEDS; i++) {
cooldown = random(0, ((Cooling * 10) / NUM_LEDS) + 2);
if(cooldown>heat[i]) {
heat[i]=0;
} else {
heat[i]=heat[i]-cooldown;
}
}
// 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' near the bottom
if( random(255) < Sparking ) {
int y = random(7);
heat[y] = heat[y] + random(160,255);
//heat[y] = random(160,255);
}
// Step 4. Convert heat to LED colors
for( int j = 0; j < NUM_LEDS; j++) {
setPixelHeatColor(j, heat[j] );
}
showStrip();
delay(SpeedDelay);
}
void setPixelHeatColor (int Pixel, byte temperature) {
// Scale 'heat' down from 0-255 to 0-191
byte t192 = round((temperature/255.0)*191);
// calculate ramp up from
byte heatramp = t192 & 0x3F; // 0..63
heatramp <<= 2; // scale up to 0..252
// figure out which third of the spectrum we're in:
if( t192 > 0x80) { // hottest
setPixel(Pixel, 255, 255, heatramp);
} else if( t192 > 0x40 ) { // middle
setPixel(Pixel, 255, heatramp, 0);
} else { // coolest
setPixel(Pixel, heatramp, 0, 0);
}
}
// *** REPLACE TO HERE ***
void showStrip() {
#ifdef ADAFRUIT_NEOPIXEL_H
// NeoPixel
strip.show();
#endif
#ifndef ADAFRUIT_NEOPIXEL_H
// FastLED
FastLED.show();
#endif
}
void setPixel(int Pixel, byte red, byte green, byte blue) {
#ifdef ADAFRUIT_NEOPIXEL_H
// NeoPixel
strip.setPixelColor(Pixel, strip.Color(red, green, blue));
#endif
#ifndef ADAFRUIT_NEOPIXEL_H
// FastLED
leds[Pixel].r = red;
leds[Pixel].g = green;
leds[Pixel].b = blue;
#endif
}
void setAll(byte red, byte green, byte blue) {
for(int i = 0; i < NUM_LEDS; i++ ) {
setPixel(i, red, green, blue);
}
showStrip();
}
Neo Test Code.ino
#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
#include <avr/power.h>
#endif
#define PIN 6
#define NUM_LEDS 144
#define BRIGHTNESS 50
Adafruit_NeoPixel strip = Adafruit_NeoPixel(NUM_LEDS, PIN, NEO_GRBW + NEO_KHZ800);
int gamma[] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2,
2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 5, 5, 5,
5, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 9, 9, 9, 10,
10, 10, 11, 11, 11, 12, 12, 13, 13, 13, 14, 14, 15, 15, 16, 16,
17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 24, 24, 25,
25, 26, 27, 27, 28, 29, 29, 30, 31, 32, 32, 33, 34, 35, 35, 36,
37, 38, 39, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 50,
51, 52, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 66, 67, 68,
69, 70, 72, 73, 74, 75, 77, 78, 79, 81, 82, 83, 85, 86, 87, 89,
90, 92, 93, 95, 96, 98, 99,101,102,104,105,107,109,110,112,114,
115,117,119,120,122,124,126,127,129,131,133,135,137,138,140,142,
144,146,148,150,152,154,156,158,160,162,164,167,169,171,173,175,
177,180,182,184,186,189,191,193,196,198,200,203,205,208,210,213,
215,218,220,223,225,228,231,233,236,239,241,244,247,249,252,255 };
void setup() {
Serial.begin(115200);
// This is for Trinket 5V 16MHz, you can remove these three lines if you are not using a Trinket
#if defined (__AVR_ATtiny85__)
if (F_CPU == 16000000) clock_prescale_set(clock_div_1);
#endif
// End of trinket special code
strip.setBrightness(BRIGHTNESS);
strip.begin();
strip.show(); // Initialize all pixels to 'off'
}
void loop() {
// Some example procedures showing how to display to the pixels:
colorWipe(strip.Color(255, 0, 0), 50); // Red
colorWipe(strip.Color(0, 0, 255), 50); // Blue
colorWipe(strip.Color(0, 0, 0, 255), 50); // White
whiteOverRainbow(20,75,5);
pulseWhite(5);
// fullWhite();
// delay(2000);
rainbowFade2White(3,3,1);
}
// Fill the dots one after the other with a color
void colorWipe(uint32_t c, uint8_t wait) {
for(uint16_t i=0; i<strip.numPixels(); i++) {
strip.setPixelColor(i, c);
strip.show();
delay(wait);
}
}
void pulseWhite(uint8_t wait) {
for(int j = 0; j < 256 ; j++){
for(uint16_t i=0; i<strip.numPixels(); i++) {
strip.setPixelColor(i, strip.Color(0,0,0, gamma[j] ) );
}
delay(wait);
strip.show();
}
for(int j = 255; j >= 0 ; j--){
for(uint16_t i=0; i<strip.numPixels(); i++) {
strip.setPixelColor(i, strip.Color(0,0,0, gamma[j] ) );
}
delay(wait);
strip.show();
}
}
void rainbowFade2White(uint8_t wait, int rainbowLoops, int whiteLoops) {
float fadeMax = 100.0;
int fadeVal = 0;
uint32_t wheelVal;
int redVal, greenVal, blueVal;
for(int k = 0 ; k < rainbowLoops ; k ++){
for(int j=0; j<256; j++) { // 5 cycles of all colors on wheel
for(int i=0; i< strip.numPixels(); i++) {
wheelVal = Wheel(((i * 256 / strip.numPixels()) + j) & 255);
redVal = red(wheelVal) * float(fadeVal/fadeMax);
greenVal = green(wheelVal) * float(fadeVal/fadeMax);
blueVal = blue(wheelVal) * float(fadeVal/fadeMax);
strip.setPixelColor( i, strip.Color( redVal, greenVal, blueVal ) );
}
//First loop, fade in!
if(k == 0 && fadeVal < fadeMax-1) {
fadeVal++;
}
//Last loop, fade out!
else if(k == rainbowLoops - 1 && j > 255 - fadeMax ){
fadeVal--;
}
strip.show();
delay(wait);
}
}
delay(500);
for(int k = 0 ; k < whiteLoops ; k ++){
for(int j = 0; j < 256 ; j++){
for(uint16_t i=0; i < strip.numPixels(); i++) {
strip.setPixelColor(i, strip.Color(0,0,0, gamma[j] ) );
}
strip.show();
}
delay(2000);
for(int j = 255; j >= 0 ; j--){
for(uint16_t i=0; i < strip.numPixels(); i++) {
strip.setPixelColor(i, strip.Color(0,0,0, gamma[j] ) );
}
strip.show();
}
}
delay(500);
}
void whiteOverRainbow(uint8_t wait, uint8_t whiteSpeed, uint8_t whiteLength ) {
if(whiteLength >= strip.numPixels()) whiteLength = strip.numPixels() - 1;
int head = whiteLength - 1;
int tail = 0;
int loops = 3;
int loopNum = 0;
static unsigned long lastTime = 0;
while(true){
for(int j=0; j<256; j++) {
for(uint16_t i=0; i<strip.numPixels(); i++) {
if((i >= tail && i <= head) || (tail > head && i >= tail) || (tail > head && i <= head) ){
strip.setPixelColor(i, strip.Color(0,0,0, 255 ) );
}
else{
strip.setPixelColor(i, Wheel(((i * 256 / strip.numPixels()) + j) & 255));
}
}
if(millis() - lastTime > whiteSpeed) {
head++;
tail++;
if(head == strip.numPixels()){
loopNum++;
}
lastTime = millis();
}
if(loopNum == loops) return;
head%=strip.numPixels();
tail%=strip.numPixels();
strip.show();
delay(wait);
}
}
}
void fullWhite() {
for(uint16_t i=0; i<strip.numPixels(); i++) {
strip.setPixelColor(i, strip.Color(0,0,0, 255 ) );
}
strip.show();
}
// Slightly different, this makes the rainbow equally distributed throughout
void rainbowCycle(uint8_t wait) {
uint16_t i, j;
for(j=0; j<256 * 5; j++) { // 5 cycles of all colors on wheel
for(i=0; i< strip.numPixels(); i++) {
strip.setPixelColor(i, Wheel(((i * 256 / strip.numPixels()) + j) & 255));
}
strip.show();
delay(wait);
}
}
void rainbow(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+j) & 255));
}
strip.show();
delay(wait);
}
}
// 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 * 3,0);
}
if(WheelPos < 170) {
WheelPos -= 85;
return strip.Color(0, WheelPos * 3, 255 - WheelPos * 3,0);
}
WheelPos -= 170;
return strip.Color(WheelPos * 3, 255 - WheelPos * 3, 0,0);
}
uint8_t red(uint32_t c) {
return (c >> 8);
}
uint8_t green(uint32_t c) {
return (c >> 16);
}
uint8_t blue(uint32_t c) {
return (c);
}
RWB 1St Code.ino
#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
#include <avr/power.h>
#endif
#define PIN 6
Adafruit_NeoPixel strip = Adafruit_NeoPixel(60, PIN, NEO_GRB + NEO_KHZ800);
void setup() {
// This is for Trinket 5V 16MHz, you can remove these three lines if you are not using a Trinket
#if defined (__AVR_ATtiny85__)
if (F_CPU == 16000000) clock_prescale_set(clock_div_1);
#endif
// End of trinket special code
strip.begin();
strip.show(); // Initialize all pixels to 'off'
}
void loop() {
// Some example procedures showing how to display to the pixels:
colorWipe(strip.Color(255, 0, 0), 10); // Red
colorWipe(strip.Color(127, 127, 127), 10); // White
colorWipe(strip.Color(0, 0, 255), 10); // Blue
colorWipe(strip.Color(255, 0, 0), 10); // Red
colorWipe(strip.Color(127, 127, 127), 10); // White
colorWipe(strip.Color(0, 0, 255), 10); // Blue
colorWipe(strip.Color(255, 0, 0), 10); // Red
colorWipe(strip.Color(127, 127, 127), 10); // White
colorWipe(strip.Color(0, 0, 255), 10); // Blue
colorWipe(strip.Color(255, 0, 0), 10); // Red
colorWipe(strip.Color(127, 127, 127), 10); // White
colorWipe(strip.Color(0, 0, 255), 10); // Blue
// Send a theater pixel chase in...
theaterChase(strip.Color(127, 0, 0), 10); // Red
theaterChase(strip.Color(127, 127, 127), 10); // White
theaterChase(strip.Color(0, 0, 127), 10); // Blue
theaterChase(strip.Color(127, 0, 0), 10); // Red
theaterChase(strip.Color(127, 127, 127), 10); // White
theaterChase(strip.Color(0, 0, 127), 10); // Blue
theaterChase(strip.Color(127, 0, 0), 10); // Red
theaterChase(strip.Color(127, 127, 127), 10); // White
theaterChase(strip.Color(0, 0, 127), 10); // Blue
rainbow(10);
rainbowCycle(10);
theaterChaseRainbow(10);
}
// Fill the dots one after the other with a color
void colorWipe(uint32_t c, uint8_t wait) {
for(uint16_t i=0; i<strip.numPixels(); i++) {
strip.setPixelColor(i, c);
strip.show();
delay(wait);
}
}
void rainbow(uint8_t wait) {
uint16_t i, j;
for(j=0; j<128; j++) {
for(i=0; i<strip.numPixels(); i++) {
strip.setPixelColor(i, Wheel((i+j) & 127));
}
strip.show();
delay(wait);
}
}
// Slightly different, this makes the rainbow equally distributed throughout
void rainbowCycle(uint8_t wait) {
uint16_t i, j;
for(j=0; j<127*5; j++) { // 5 cycles of all colors on wheel
for(i=0; i< strip.numPixels(); i++) {
strip.setPixelColor(i, Wheel(((i * 128 / strip.numPixels()) + j) & 127));
}
strip.show();
delay(wait);
}
}
//Theatre-style crawling lights.
void theaterChase(uint32_t c, uint8_t wait) {
for (int j=0; j<10; j++) { //do 10 cycles of chasing
for (int q=0; q < 3; q++) {
for (uint16_t i=0; i < strip.numPixels(); i=i+3) {
strip.setPixelColor(i+q, c); //turn every third pixel on
}
strip.show();
delay(wait);
for (uint16_t i=0; i < strip.numPixels(); i=i+5) {
strip.setPixelColor(i+q, 0); //turn every third pixel off
}
}
}
}
//Theatre-style crawling lights with rainbow effect
void theaterChaseRainbow(uint8_t wait) {
for (int j=0; j < 256; j++) { // cycle all 256 colors in the wheel
for (int q=0; q < 3; q++) {
for (uint16_t i=0; i < strip.numPixels(); i=i+3) {
strip.setPixelColor(i+q, Wheel( (i+j) % 255)); //turn every third pixel on
}
strip.show();
delay(wait);
for (uint16_t i=0; i < strip.numPixels(); i=i+3) {
strip.setPixelColor(i+q, 0); //turn every third pixel off
}
}
}
}
// 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 = 150 - WheelPos;
if(WheelPos < 100) {
return strip.Color(150 - WheelPos * 3, 0, WheelPos * 3);
}
if(WheelPos < 255) {
WheelPos -= 100;
return strip.Color(100, WheelPos * 3, 125 - WheelPos * 3);
}
WheelPos -= 190;
return strip.Color(WheelPos * 2, 100 - WheelPos * 4, 255);
}
