print("Hello, ESP32!")
from machine import Pin
led1=(21,Pin.OUT)
led2=(22,Pin.OUT)
led3=(23,Pin.OUT)
while true:
led1.on()
sleep(0.5)
led2.on()
sleep(0.5)
led3.on()
sleep(0.5)
led1.off()
led2.off()
led3.off()
sleep(0.5)