from machine import Pin
from utime import sleep

pin1 = Pin(16, Pin.OUT)
pin2 = Pin(17, Pin.OUT)
pin3 = Pin(18, Pin.OUT)
pin4 = Pin(19, Pin.OUT)

num = 1

while True:
    print(f"{num:04b}")
    pin1.value(num & 0b_0001)
    pin2.value(num & 0b_0010)
    pin3.value(num & 0b_0100)
    pin4.value(num & 0b_1000)

    num = num << 1 
    

    if num > 0b_1000:
        num = 1

    sleep(0.2)