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实操步骤：
1.将15号pin连接到指定的LED灯的针脚 （硬件准备）
2.复制basic中的blink示例的代码
3.通过宏定义定下输出的端口 #define LED_BUILTIN 15
4.选择开发板：工具->开发板->ESP32 DEV Module
5.再选择对应的端口
6.上传
示例代码
#define LED_BUILTIN 15
// the setup function runs once when you press reset or power the board
void setup() {
// initialize digital pin LED_BUILTIN as an output.
pinMode(LED_BUILTIN, OUTPUT);
}
// the loop function runs over and over again forever
void loop() {
digitalWrite(LED_BUILTIN, HIGH); // turn the LED on (HIGH is the voltage level)
delay(1000); // wait for a second
digitalWrite(LED_BUILTIN, LOW); // turn the LED off by making the voltage LOW
delay(1000); // wait for a second
}