print("Hello, ESP32!")
import time
from machine import Pin 
l1= Pin(23, Pin.OUT)
l2= Pin(22, Pin.OUT)
l3= Pin(21, Pin.OUT)
bz= Pin(18, Pin.IN)
btn= Pin(19, Pin.OUT)
while True :
    if btn.on():
        l1.on()
        l2.off()
        l3.off()
        bz.on()
        time.sleep(0.5)
        l1.on()
        l2.on()
        l3.off()
        bz.off()
        time.sleep(0.5)
        l1.on()
        l2.on()
        l3.on()
        bz.on()
        else:
            l1.off()
            l2.off()
            l3.off()
            bz.off()