The WS2812B is a popular type of addressable RGB LED strip that allows for individual control of each LED's color and brightness. This capability makes it ideal for creating dynamic and colorful lighting effects in various applications, including home automation, decorative lighting, and interactive displays. By integrating WS2812B LEDs with an Arduino, hobbyists and engineers can easily program and control complex lighting patterns. This article will guide you through the process of setting up and controlling WS2812B LEDs using an Arduino, providing detailed examples and code snippets.

Projeto: In this project, we will create a simple yet captivating lighting pattern using WS2812B LEDs controlled by an Arduino. The objective is to demonstrate how to initialize the LED strip, set individual LED colors, and create a basic animation effect. This project will cover the following functionalities:

• Initializing the WS2812B LED strip.
• Setting individual LED colors.
• Creating a simple animation effect (e.g., a color chase).

Lista de componentes:

• Arduino Uno (1)
• WS2812B LED strip (1 meter, 60 LEDs)
• 5V power supply (1)
• 470-ohm resistor (1)
• Capacitor 1000µF, 6.3V or higher (1)
• Breadboard and jumper wires

Exemplos:

1. Basic Setup and Initialization:

#include <Adafruit_NeoPixel.h>

// Define the number of LEDs and the pin connected to the LED strip
#define LED_PIN    6
#define LED_COUNT  60

// Create an instance of the Adafruit_NeoPixel class
Adafruit_NeoPixel strip = Adafruit_NeoPixel(LED_COUNT, LED_PIN, NEO_GRB + NEO_KHZ800);

void setup() {
  // Initialize the LED strip
  strip.begin();
  // Set all LEDs to off
  strip.show();
}

void loop() {
  // Example function to set the first LED to red
  strip.setPixelColor(0, strip.Color(255, 0, 0));
  // Update the strip to show the changes
  strip.show();
  delay(500);
}

Comments:

• The Adafruit_NeoPixel library is used to control the WS2812B LEDs.
• LED_PIN and LED_COUNT define the pin connected to the LED strip and the number of LEDs, respectively.
• The strip.begin() function initializes the LED strip.
• strip.setPixelColor(0, strip.Color(255, 0, 0)) sets the first LED to red.
• strip.show() updates the strip to display the changes.

2. Creating a Color Chase Animation:

#include <Adafruit_NeoPixel.h>

#define LED_PIN    6
#define LED_COUNT  60

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

void setup() {
  strip.begin();
  strip.show();
}

void loop() {
  colorChase(strip.Color(255, 0, 0), 50); // Red chase
  colorChase(strip.Color(0, 255, 0), 50); // Green chase
  colorChase(strip.Color(0, 0, 255), 50); // Blue chase
}

void colorChase(uint32_t color, int wait) {
  for(int i=0; i<strip.numPixels(); i++) {
    strip.setPixelColor(i, color);
    strip.show();
    delay(wait);
    strip.setPixelColor(i, 0); // Turn off the pixel after the delay
  }
}

Comments:

• The colorChase function creates a chasing effect by lighting each LED in sequence and then turning it off after a delay.
• The colorChase(strip.Color(255, 0, 0), 50) line initiates a red color chase with a 50ms delay between each LED.