// A basic everyday NeoPixel strip test program.

// NEOPIXEL BEST PRACTICES for most reliable operation:

// - Add 1000 uF CAPACITOR between NeoPixel strip's + and - connections.

// - MINIMIZE WIRING LENGTH between microcontroller board and first pixel.

// - NeoPixel strip's DATA-IN should pass through a 300-500 OHM RESISTOR.

// - AVOID connecting NeoPixels on a LIVE CIRCUIT. If you must, ALWAYS

// connect GROUND (-) first, then +, then data.

// - When using a 3.3V microcontroller with a 5V-powered NeoPixel strip,

// a LOGIC-LEVEL CONVERTER on the data line is STRONGLY RECOMMENDED.

// (Skipping these may work OK on your workbench but can fail in the field)

#include <Adafruit_NeoPixel.h>

#ifdef __AVR__

#include <avr/power.h> // Required for 16 MHz Adafruit Trinket

#endif

// Which pin on the Arduino is connected to the NeoPixels?

// On a Trinket or Gemma we suggest changing this to 1:

#define LED_PIN 6

// How many NeoPixels are attached to the Arduino?

#define LED_COUNT 5

// Declare our NeoPixel strip object:

Adafruit_NeoPixel strip(LED_COUNT, LED_PIN, NEO_GRB + NEO_KHZ800);

// Argument 1 = Number of pixels in NeoPixel strip

// Argument 2 = Arduino pin number (most are valid)

// Argument 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)

// NEO_RGBW Pixels are wired for RGBW bitstream (NeoPixel RGBW products)

// setup() function -- runs once at startup --------------------------------

void setup() {

// These lines are specifically to support the Adafruit Trinket 5V 16 MHz.

// Any other board, you can remove this part (but no harm leaving it):

#if defined(__AVR_ATtiny85__) && (F_CPU == 16000000)

clock_prescale_set(clock_div_1);

#endif

// END of Trinket-specific code.

strip.begin(); // INITIALIZE NeoPixel strip object (REQUIRED)

strip.show(); // Turn OFF all pixels ASAP

strip.setBrightness(50); // Set BRIGHTNESS to about 1/5 (max = 255)

}

// loop() function -- runs repeatedly as long as board is on ---------------

void loop() {

// Fill along the length of the strip in various colors...

colorWipe(strip.Color(255, 0, 0), 50); // Red

colorWipe(strip.Color( 0, 255, 0), 50); // Green

colorWipe(strip.Color( 0, 0, 255), 50); // Blue

// Do a theater marquee effect in various colors...

theaterChase(strip.Color(127, 127, 127), 50); // White, half brightness

theaterChase(strip.Color(127, 0, 0), 50); // Red, half brightness

theaterChase(strip.Color( 0, 0, 127), 50); // Blue, half brightness

rainbow(10); // Flowing rainbow cycle along the whole strip

theaterChaseRainbow(50); // Rainbow-enhanced theaterChase variant

}

// Some functions of our own for creating animated effects -----------------

// Fill strip pixels one after another with a color. Strip is NOT cleared

// first; anything there will be covered pixel by pixel. Pass in color

// (as a single 'packed' 32-bit value, which you can get by calling

// strip.Color(red, green, blue) as shown in the loop() function above),

// and a delay time (in milliseconds) between pixels.

void colorWipe(uint32_t color, int wait) {

for(int i=0; i<strip.numPixels(); i++) { // For each pixel in strip...

strip.setPixelColor(i, color); // Set pixel's color (in RAM)

strip.show(); // Update strip to match

delay(wait); // Pause for a moment

}

}

// Theater-marquee-style chasing lights. Pass in a color (32-bit value,

// a la strip.Color(r,g,b) as mentioned above), and a delay time (in ms)

// between frames.

void theaterChase(uint32_t color, int wait) {

for(int a=0; a<10; a++) { // Repeat 10 times...

for(int b=0; b<3; b++) { // 'b' counts from 0 to 2...

strip.clear(); // Set all pixels in RAM to 0 (off)

// 'c' counts up from 'b' to end of strip in steps of 3...

for(int c=b; c<strip.numPixels(); c += 3) {

strip.setPixelColor(c, color); // Set pixel 'c' to value 'color'

}

strip.show(); // Update strip with new contents

delay(wait); // Pause for a moment

}

}

}

// Rainbow cycle along whole strip. Pass delay time (in ms) between frames.

void rainbow(int wait) {

// Hue of first pixel runs 5 complete loops through the color wheel.

// Color wheel has a range of 65536 but it's OK if we roll over, so

// just count from 0 to 5*65536. Adding 256 to firstPixelHue each time

// means we'll make 5*65536/256 = 1280 passes through this outer loop:

for(long firstPixelHue = 0; firstPixelHue < 5*65536; firstPixelHue += 256) {

for(int i=0; i<strip.numPixels(); i++) { // For each pixel in strip...

// Offset pixel hue by an amount to make one full revolution of the

// color wheel (range of 65536) along the length of the strip

// (strip.numPixels() steps):

int pixelHue = firstPixelHue + (i * 65536L / strip.numPixels());

// strip.ColorHSV() can take 1 or 3 arguments: a hue (0 to 65535) or

// optionally add saturation and value (brightness) (each 0 to 255).

// Here we're using just the single-argument hue variant. The result

// is passed through strip.gamma32() to provide 'truer' colors

// before assigning to each pixel:

strip.setPixelColor(i, strip.gamma32(strip.ColorHSV(pixelHue)));

}

strip.show(); // Update strip with new contents

delay(wait); // Pause for a moment

}

}

// Rainbow-enhanced theater marquee. Pass delay time (in ms) between frames.

void theaterChaseRainbow(int wait) {

int firstPixelHue = 0; // First pixel starts at red (hue 0)

for(int a=0; a<30; a++) { // Repeat 30 times...

for(int b=0; b<3; b++) { // 'b' counts from 0 to 2...

strip.clear(); // Set all pixels in RAM to 0 (off)

// 'c' counts up from 'b' to end of strip in increments of 3...

for(int c=b; c<strip.numPixels(); c += 3) {

// hue of pixel 'c' is offset by an amount to make one full

// revolution of the color wheel (range 65536) along the length

// of the strip (strip.numPixels() steps):

int hue = firstPixelHue + c * 65536L / strip.numPixels();

uint32_t color = strip.gamma32(strip.ColorHSV(hue)); // hue -> RGB

strip.setPixelColor(c, color); // Set pixel 'c' to value 'color'

}

strip.show(); // Update strip with new contents

delay(wait); // Pause for a moment

firstPixelHue += 65536 / 90; // One cycle of color wheel over 90 frames

}

}

}