初次接触FastLed,先点灯。开发环境VSCODE PlatformIO 。

直接使用FastLed的示例blink程序，略有修改DATA_PIN D1，注释掉CLOCK_PIN。

#include <FastLED.h>

// How many leds in your strip?
#define NUM_LEDS 1

// For led chips like WS2812, which have a data line, ground, and power, you just
// need to define DATA_PIN.  For led chipsets that are SPI based (four wires - data, clock,
// ground, and power), like the LPD8806 define both DATA_PIN and CLOCK_PIN
// Clock pin only needed for SPI based chipsets when not using hardware SPI
#define DATA_PIN D1
#define BRIGHTNESS 8
// #define CLOCK_PIN 13

// Define the array of leds
CRGB leds[NUM_LEDS];

void setup() { 
    // Uncomment/edit one of the following lines for your leds arrangement.
    // ## Clockless types ##
    
    FastLED.addLeds<WS2812, DATA_PIN, RGB>(leds, NUM_LEDS);  // GRB ordering is typical
 FastLED.setBrightness( BRIGHTNESS );    
}

void loop() { 
  // Turn the LED on, then pause
  leds[0] = CRGB::Red;
  FastLED.show();
  delay(500);
  // Now turn the LED off, then pause
  leds[0] = CRGB::Black;
  FastLED.show();
  delay(500);
}

代码是红色，但运行效果是绿色灯闪烁，后搜索bing 发现其他人有同样问题，就是颜色相反，红色变绿色。

国外网友遇到的问题及解决

总结下来是颜色格式的问题，我买的WS2812模块是GRB格式。其实示例的注释也提醒了GRB是典型格式。

修改的源码中的为：

 FastLED.addLeds<WS2812, DATA_PIN, GRB>(leds, NUM_LEDS);  // GRB ordering is typical

完整源码：

#include <FastLED.h>

// How many leds in your strip?
#define NUM_LEDS 1

// For led chips like WS2812, which have a data line, ground, and power, you just
// need to define DATA_PIN.  For led chipsets that are SPI based (four wires - data, clock,
// ground, and power), like the LPD8806 define both DATA_PIN and CLOCK_PIN
// Clock pin only needed for SPI based chipsets when not using hardware SPI
#define DATA_PIN D1
#define BRIGHTNESS 8
// #define CLOCK_PIN 13

// Define the array of leds
CRGB leds[NUM_LEDS];

void setup() { 
    // Uncomment/edit one of the following lines for your leds arrangement.
    // ## Clockless types ##
    
    FastLED.addLeds<WS2812, DATA_PIN, GRB>(leds, NUM_LEDS);  // GRB ordering is typical   
FastLED.setBrightness( BRIGHTNESS ); 
}

void loop() { 
  // Turn the LED on, then pause
  leds[0] = CRGB::Red;
  FastLED.show();
  delay(500);
  // Now turn the LED off, then pause
  leds[0] = CRGB::Black;
  FastLED.show();
  delay(500);
}

工程配置：

[env:nodemcuv2]
platform = espressif8266
board = nodemcuv2
framework = arduino
lib_deps = fastled/FastLED@^3.5.0
monitor_speed = 115200 ;monitor baud
upload_speed = 921600  ;upload baud