Simple line following code for 4tronix bitbot

bitbot_line.py

# Add your Python code here. E.g.
from microbit import *
import neopixel

np = neopixel.NeoPixel(pin13, 12)

speed = 250
reduce_by = 4
red = (40, 0, 0)
green = (0, 40, 0)

def leds(left, right):
    for x in range(0, 5):
        np[x] = left
    for x in range(6, 11):
        np[x] = right
    np.show()

def left_motor(pwm_value, rev=0):
    pin0.write_analog(pwm_value)
    pin8.write_digital(0)

def right_motor(pwm_value, rev=0):
    pin1.write_analog(pwm_value)
    pin12.write_digital(0)

def spin_left(fast_speed):
    slow_speed = 0
    left_motor(slow_speed)
    right_motor(fast_speed)

def spin_right(fast_speed):
    slow_speed = 0
    left_motor(fast_speed)
    right_motor(slow_speed)
    
def forward(fast_speed):
    left_motor(fast_speed)
    right_motor(fast_speed)
    
while True:
    lline = pin11.read_digital()
    rline = pin5.read_digital()
    if (lline == 1):
        display.show(Image.ARROW_W)
        leds(red, green)
        spin_left(speed)
    elif (rline == 1):
        display.show(Image.ARROW_E)
        leds(green, red)
        spin_right(speed)
    else:
        display.show(Image.ARROW_N)
        leds(green, green)
        forward(speed)