int LEDRB = 2;
int LEDGY = 4;

void setup() {
  // put your setup code here, to run once:
  pinMode(LEDRB, OUTPUT);
  pinMode(LEDGY, OUTPUT);
  Serial.begin(9600);
  Serial.println("Hello, ESP32!");
}

void loop() {
  // put your main code here, to run repeatedly:
  for(int i = 0; i<=1000; i = i+30){
  digitalWrite(LEDRB, HIGH);
  delay(i);
  digitalWrite(LEDRB, LOW);
  delay(i);
  digitalWrite(LEDGY, HIGH);
  delay(i);
  digitalWrite(LEDGY, LOW);
  delay(i);
  }
}