from machine import Pin
from time import sleep

blue_led = Pin(15, Pin.OUT)
orange_led = Pin(4, Pin.OUT)

black_button = Pin(17, Pin.IN)
gray_button = Pin(16, Pin.IN)

previous_button_pressed = button_pressed = ''

def leds_flash_together():
    blue_led.on()
    orange_led.on()
    sleep(1)
    blue_led.off()
    orange_led.off()

def leds_flash_alternately():
    sleep(0.5)
    blue_led.on()
    orange_led.off()
    sleep(1)
    blue_led.off()
    orange_led.on()
    sleep(0.5)

try:
    while True:
        if black_button.value() and previous_button_pressed != 'black':
            button_pressed = "black"
        
        if gray_button.value() and previous_button_pressed != "gray":
            button_pressed = "gray"

        if black_button.value() and gray_button.value():
            button_pressed = ""

        previous_button_pressed = button_pressed

        if button_pressed == "black":
            leds_flash_together()
        elif button_pressed == "gray":
            leds_flash_alternately()
        sleep(0.2)
except KeyboardInterrupt:
    blue_led.value(0)
    orange_led.value(0)
    print('> Bye!')