1. /**
    2.  * ESP8266 电量内置LED 灯
    3.  */
    4. #define led         LED_BUILTIN
    6. void setup() { 
    8.     // 编写你的启动代码，只运行一次: 
    9.     pinMode(led, OUTPUT); 
    10.     //ESP8266_LED 
    11. } 
    12. void loop() { 
    13.     // put your main code here, to run repeatedly: 
    14.     digitalWrite(led, HIGH); // LED off 
    15.     delay(500); 
    16.     digitalWrite(led, LOW); // LED on 
    17.     delay(500); 
    18. }