LED Test

LedTest.ino tests the WS2812b LED, known as Neopixel. After setting the LED color to Red, Green, and Blue for one second, it is set to white, and the brightness is incrementally increased to the maximum before decreasing it back to 0.

Note

Install the Adafruit_NeoPixel Arduino Library through the Arduino IDE.

Tip

Check the Adafruit Documentation pages to learn what is possible with their libraries:

• Adafruit Neopixel Guide
• Adafruit Neopixel Library Reference You can also check the Example sketches that come with the library in Arduino IDE under File > Examples > Adafruit NeoPixel.

LedTest.ino

#define LED_PIN 10
#define LED_NUM 1

#include <Adafruit_NeoPixel.h>

Adafruit_NeoPixel led(LED_NUM, LED_PIN, NEO_GRB + NEO_KHZ800);

void setup() {
  Serial.begin(115200);
  Serial.println("STARTED");

  led.begin();
  led.setBrightness(127);
}

void loop() {
  led.clear();
  led.show();

  delay(1000);

  // R
  led.setPixelColor(0, 255, 0, 0);
  led.show();
  delay(1000);

  // G
  led.setPixelColor(0, 0, 255, 0);
  led.show();
  delay(1000);

  // B
  led.setPixelColor(0, 0, 0, 255);
  led.show();
  delay(1000);

  // Brightness
  for(int i=0; i<256; ++i) {
    led.setPixelColor(0, 255, 255, 255);
    led.setBrightness(i);
    led.show();
    delay(25);
  }
  for(int i=255; i>0; --i) {
    led.setPixelColor(0, 255, 255, 255);
    led.setBrightness(i);
    led.show();
    delay(25);
  }

  delay(3000);
}