NeoPixel(WS2812)

A single LED that can display multiple colors by adjusting RGB values, with each LED individually controllable by a controller.

In the text, two models were used: a circular one with 7 LEDs and a linear one with 8 LEDs.

The terminals total either 6 or 8, with the 6-terminal version comprising (IN, 2x VCC, 2x GND, OUT), and the 8-terminal version adding 2 more GNDs to the 6-terminal setup.

Connecting the OUT terminal of a NeoPixel to the IN terminal of the next allows for controlling multiple NeoPixels with just one pin on the board.

Specifications

• Operating Voltage: 5V
• Current per LED: 20mA ~ 80mA

Required Hardware

• NeoPixel
• Arduino UNO
• UNO cable
• M-M cable(6ea)
• F-M cable(3ea)

Connection (M-M and F-M cables were soldered for connection to the NeoPixel)

• NeoPixel to Arduino Connection

NeoPixel	Arduino
IN	D7
VCC	5V
GND	GND

• Connection between the 1st and 2nd NeoPixel (apply the same method to add more NeoPixels):

1st NeoPixel	2nd NeoPixel
OUT	IN
VCC	VCC
GND	GND

Library

• Adafruit NeoPixel (Arduino Libraries)

예제 코드

#include <Adafruit_NeoPixel.h>

// Using pin number 7
#define PIN        7
// Number of pixels
#define NUMPIXELS 15
// Brightness level
#define bright 255
#define dly 10000
// Create a NeoPixel object for control
Adafruit_NeoPixel neo(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

void setup() {
    // Start NeoPixel
    neo.begin();
    // Set NeoPixel brightness
    neo.setBrightness(bright);
    // Initialize NeoPixel
    neo.clear();
    // Apply NeoPixel settings
    // Settings are applied internally until .show() is executed.
    // When .show() runs, the commands applied internally are executed on the LEDs.
    neo.show();
}

void loop()
{
    // Turn LEDs white
    for (int i = 0; i < 15; i++)
    {
        neo.setPixelColor(i, 255, 255, 255);
    }
    neo.show();
    delay(500);

    // Turn LEDs red
    for (int i = 0; i < 15; i++)
    {
        neo.setPixelColor(i, 255, 0, 0);
    }
    neo.show();
    delay(500);

    // Turn LEDs green
    for (int i = 0; i < 15; i++)
    {
        neo.setPixelColor(i, 0, 255, 0);
    }
    neo.show();
    delay(500);

    // Turn LEDs blue
    for (int i = 0; i < 15; i++)
    {
        neo.setPixelColor(i, 0, 0, 255);
    }
    neo.show();
    delay(500);
}

Execution Result