text: #include <Arduino.h>
  
  void setup()
  {
    pinMode(LED_BUILTIN, OUTPUT); // Initialize the LED_BUILTIN pin as an output
  }
  
  // the loop function runs over and over again forever
  void loop()
  {
    digitalWrite(LED_BUILTIN, 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(100);                     // Wait for a second
    digitalWrite(LED_BUILTIN, HIGH); // Turn the LED off by making the voltage HIGH
    delay(200);                     // Wait for two seconds (to demonstrate the active low LED)
  }
  