from machine import Pin
from utime import sleep

print("Hello, ESP32!")

led = Pin(2, Pin.OUT)
led1  = Pin(18, Pin.OUT)
led2  = Pin(19, Pin.OUT)
led3  = Pin(21, Pin.OUT)
while True:
  led.on()
  sleep(0.2)
  led.off()
  sleep(0.2)
  led1.on()
  sleep(0.2)
  led1.off()
  sleep(0.2)
  led2.on()
  sleep(0.2)
  led2.off()
  sleep(0.2)
  led3.on()
  sleep(0.2)
  led3.off()
  sleep(0.2)