from microbit import *

display.show("x")   #stop
pin8.write_digital(0)
pin12.write_digital(0)
pin16.write_digital(0)
pin0.write_digital(0)

while True:
    local_input = uart.read()
    if local_input != None:
        message = str(local_input, 'utf8')

        if message == 's':   #back
            display.show(Image.ARROW_S)
            pin8.write_digital(0)
            pin12.write_digital(1)
            pin16.write_digital(0)
            pin0.write_digital(1)
        elif message == 'w':    #front
            display.show(Image.ARROW_N)
            pin8.write_digital(1)
            pin12.write_digital(0)
            pin16.write_digital(1)
            pin0.write_digital(0)
        elif message == 'd':    #right
            display.show(Image.ARROW_W)
            pin8.write_digital(1)
            pin12.write_digital(0)
            pin16.write_digital(0)
            pin0.write_digital(1)
        elif message == 'a': #left
            display.show(Image.ARROW_E)
            pin8.write_digital(0)
            pin12.write_digital(1)
            pin16.write_digital(1)
            pin0.write_digital(0)
        else:
            display.show("x")   #stop
            pin8.write_digital(0)
            pin12.write_digital(0)
            pin16.write_digital(0)
            pin0.write_digital(0)
    sleep(100)