from microbit import *
import motobit

THRESHOLD = 700

moto = motobit.MotoBit()
moto.enable()
l = moto.left_motor()
r = moto.right_motor()

while True:
    # DEBUG: display.scroll(str(pin1.read_analog()))
    if pin1.read_analog() > THRESHOLD:
        display.show(Image.ARROW_W)
        r.reverse(40)
        l.forward(10)
    else:
        display.show(Image.ARROW_E)
        r.forward(10)
        l.reverse(40)
    sleep(10)