{ pinMode(LED_BUILTIN, OUTPUT); // LED pin as output. }
void loop()
{ digitalWrite(LED_BUILTIN, HIGH);// turn the LED off.(Note that LOW is the voltage level but actually //the LED is on; this is because it is acive low on the ESP8266. delay(1000); // wait for 1 second. digitalWrite(LED_BUILTIN, LOW); // turn the LED on. delay(1000); // wait for 1 second. }