led_blinking.cpp

#include <Arduino.h>

/**
 * Choose the GPIO port
 * Wiring:
 * ESP32-GND to LED-
 * ESP-G2    to LED+
 */
#define LED 2

/**
 * Setup serial; Baud rate: 115200
 */
void setup_serial()
{
  Serial.begin(115200);
  while (!Serial)
    /* wait! */;
}

void setup()
{
  setup_serial();       // setup serial port
  pinMode(LED, OUTPUT); // setup LED
}

void loop()
{
  delay(500); // wait for 500ms
  digitalWrite(LED, HIGH); // turn LED on
  Serial.println("LED is ON"); // send message over serial
  delay(500); // wait for 500ms
  digitalWrite(LED, LOW); // turn LED off
  Serial.println("LED is OFF"); // send message over serial
}