from machine import Pin
from utime import sleep

print("Hello, ESP32!")

red=Pin(17,Pin.OUT)
green=Pin(16,Pin.OUT)
blue=Pin(15,Pin.OUT)

while True:
  red.on()
  green.off()
  blue.off()
  sleep(0.5)

  red.off()
  green.on()
  blue.off()
  sleep(0.5)

  red.off()
  green.off()
  blue.on()
  sleep(0.5)