import machine, time

p26 = machine.Pin(26)
in1 = machine.PWM(p26)

p27 = machine.Pin(27)
in2 = machine.PWM(p27)

while True:
    in1.freq(500)
    in1.duty_u16(60000)
    
    in2.freq(500)
    in2.duty_u16(0)
    print("fwd")
    time.sleep(2)
    
    in2.freq(500)
    in2.duty_u16(60000)
    
    in1.freq(500)
    in1.duty_u16(0)
    print("rev")
    time.sleep(2)