ทดสอบการควบคุมหลอดไฟ LED ด้วยบอร์ดพัฒนา NodeMCU ESP-12E

#define LED_PIN D1                      // GPIO5
void setup() {
 pinMode(LED_PIN, OUTPUT);             // Initialize the LED_BUILTIN pin as an output
}

// the loop function runs over and over again forever
void loop() {
 digitalWrite(LED_PIN, LOW);     // Turn the LED on (Note that LOW is the voltage level
                                   // but actually, the LED is on; this is because
                                   // it is active low on the ESP-01)
 delay(1000);                    // Wait for a second
 digitalWrite(LED_PIN, HIGH);    // Turn the LED off by making the voltage HIGH
 delay(2000);               // Wait for two seconds (to demonstrate the active low LED)
}