import machine
import time
from machine import Pin

Am=Pin(7,Pin.OUT)
AM=Pin(6,Pin.OUT)
BM=Pin(5,Pin.OUT)
Bm=Pin(4,Pin.OUT)

while True:
    AM.value(1)
    BM.value(0)
    Am.value(0)
    Bm.value(0)

    time.sleep_ms(100)

    AM.value(0)
    BM.value(1)
    Am.value(0)
    Bm.value(0)

    time.sleep_ms(100)

    AM.value(0)
    BM.value(0)
    Am.value(1)
    Bm.value(0)

    time.sleep_ms(100)

    AM.value(0)
    BM.value(0)
    Am.value(0)
    Bm.value(1)

    time.sleep_ms(1000)