int LEDG = 18; // change the number here to change the LED selected
int LEDY = 19;
int LEDR = 23;

void setup()
{
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(LEDG,OUTPUT);
  pinMode(LEDY,OUTPUT);
  pinMode(LEDR,OUTPUT);
}

void loop()
{ // codes in loop() runs forever
  digitalWrite(LEDG,LOW);
  digitalWrite(LEDY,LOW);
  digitalWrite(LEDR,LOW);
  delay(1000);// changing 1000 to a lower number speeds up the simulation
  digitalWrite(LEDG, HIGH);
  digitalWrite(LEDY,HIGH);
  digitalWrite(LEDR,HIGH);
  delay(1000); // changing 1000 to a lower number speeds up the simulation
}