from machine import Pin
from time import sleep


ledA = Pin(15, Pin.OUT)
ledB = Pin(0, Pin.OUT)


button = Pin(4, Pin.IN, Pin.PULL_DOWN)

while True:
    if button.value() == 1:  
        ledA.value(1)   
        sleep(0.5)      
        ledA.value(0)   
        sleep(0.5)

        ledB.value(1)   
        sleep(0.5)  
        ledB.value(0)   
        sleep(0.5)
    else:
        # Ensure LEDs stay off when button isn't pressed
        ledA.value(0)
        ledB.value(0)
    ledA.value(button.value())
    ledB.value(button.value())