Arduino and NeoPixel Interfacing

Interfacing NeoPixel Strip with Arduino

Arduino Library needed:  

  Adafruit_NeoPixel.h  

  OR 

  FastLED_NeoPixel  

See Also: Arduino Development Platform

Code in Action:

Example Code: 

Adafruit Version

#include <Adafruit_NeoPixel.h>

#define PIN_NEO_PIXEL 10  // Arduino pin that connects to NeoPixel

#define NUM_PIXELS 10    // The number of LEDs (pixels) on NeoPixel

#define DELAY_INTERVAL 100  // 100 ms pause between each pixel

Adafruit_NeoPixel NeoPixel(NUM_PIXELS, PIN_NEO_PIXEL, NEO_GRB + NEO_KHZ800);

void setup() {

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

}

void loop() {

  NeoPixel.clear();  // set all pixel colors to 'off'. It only takes effect if pixels.show() is called

  // turn pixels to green one by one with delay between each pixel

  for (int pixel = 0; pixel < NUM_PIXELS; pixel++) {           // for each pixel

    NeoPixel.setPixelColor(pixel, NeoPixel.Color(0, 255, 0));  // it only takes effect if pixels.show() is called

    NeoPixel.show();                                           // send the updated pixel colors to the NeoPixel hardware.

    delay(DELAY_INTERVAL);  // pause between each pixel

  }

  // turn off all pixels for half seconds

  NeoPixel.clear();

  NeoPixel.show();  // send the updated pixel colors to the NeoPixel hardware.

  delay(500);      // off time

  // turn on all pixels to red at the same time for half seconds

  for (int pixel = 0; pixel < NUM_PIXELS; pixel++) {           // for each pixel

    NeoPixel.setPixelColor(pixel, NeoPixel.Color(255, 0, 0));  // it only takes effect if pixels.show() is called

  }

  NeoPixel.show();  // send the updated pixel colors to the NeoPixel hardware.

  delay(500);      // on time

  // turn off all pixels for half seconds

  NeoPixel.clear();

  NeoPixel.show();  // send the updated pixel colors to the NeoPixel hardware.

  delay(500);      // off time

  // turn on all pixels to blue at the same time for half seconds

  for (int pixel = 0; pixel < NUM_PIXELS; pixel++) {           // for each pixel

    NeoPixel.setPixelColor(pixel, NeoPixel.Color(0, 0, 255));  // it only takes effect if pixels.show() is called

  }

  NeoPixel.show();  // send the updated pixel colors to the NeoPixel hardware.

  delay(500);      // on time

  // turn off all pixels for half seconds

  NeoPixel.clear();

  NeoPixel.show();  // send the updated pixel colors to the NeoPixel hardware.

  delay(500);      // off time

FastLED Version

#include <FastLED_NeoPixel.h>

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

#define DATA_PIN 10

// How many LEDs are attached to the Arduino?

#define NUM_LEDS 10

// LED brightness, 0 (min) to 255 (max)

#define BRIGHTNESS 50

// Amount of time for each half-blink, in milliseconds

#define BLINK_TIME 500

FastLED_NeoPixel<NUM_LEDS, DATA_PIN, NEO_GRB> strip;      // <- FastLED NeoPixel version

void setup() {

strip.begin();  // initialize strip (required!)

strip.setBrightness(BRIGHTNESS);

}

void loop() {

  // Running effect of Green color

  for(int i=0; i<10; i++) {

    strip.setPixelColor(i, strip.Color(0,255,0));

    strip.show();

    delay(100);    

  }

  delay(BLINK_TIME);

  // All LEDs OFF

    for(int i=0; i<10; i++) {

    strip.setPixelColor( i, strip.Color(0,0,0));

    strip.show();

    }

    delay(BLINK_TIME);

// All red LEDs ON

  for(int i=0; i<10; i++) {

    strip.setPixelColor(i, strip.Color(255,0,0));

    strip.show();

  }

  delay(BLINK_TIME);

  // All LEDs OFF

    for(int i=0; i<10; i++) {

    strip.setPixelColor(i, strip.Color(0,0,0));

    strip.show();

  }

  delay(BLINK_TIME);

// All Blue LEDs ON  

  for(int i=0; i<10; i++) {

    strip.setPixelColor(i, strip.Color(0,0,255));

    strip.show();

  }

  delay(BLINK_TIME); 

// ALL LEDs OFF

     for(int i=0; i<10; i++) {

    strip.setPixelColor(i, strip.Color(0,0,0));

    strip.show();

  }

  delay(BLINK_TIME);  

}

See Also: Arduino Development Platform