Getting started with the WeMos IoT board-opening example-light up the built-in LED

Light up the built-in LED

The built-in LED on the WebMos D1 R2 development board is shared with the TXD interface, so Serial.print() cannot be used when using the LED.

// 程序初始化
void setup() {
  pinMode(LED_BUILTIN, OUTPUT);     // 设置LED_BUILTIN引脚为输出
}

// 无限循环
void loop() {
  digitalWrite(LED_BUILTIN, LOW);   // 点亮内置LED，内置LED设置低电压时LED实际是点亮
  delay(1000);                      // 延时1秒
  digitalWrite(LED_BUILTIN, HIGH);  // 关闭内置LED
  delay(1000);                      //  延时1秒
}

Compile and upload the code to the development board: