import machine
import time


in1 = machine.Pin(16,machine.Pin.OUT)
in2 = machine.Pin(17,machine.Pin.OUT)
in3 = machine.Pin(18, machine.Pin.OUT)
in4 = machine.Pin(19,machine.Pin.OUT)
ena = machine.Pin(22,machine.Pin.OUT)
enb = machine.Pin(23,machine.Pin.OUT)


while True:
    
    in1.value(0)
    in2.value(1)
    in3.value(0)
    in4.value(1)
    time.sleep(2)
    in1.value(1)
    in2.value(0)
    in3.value(1)
    in4.value(0)
    time.sleep(2)