motr_board.py

from microbit import *
pin8.set_analog_period(1)
pin12.set_analog_period(1)
pin0.set_analog_period(1)
pin16.set_analog_period(1)
def_speed = 512

def move_forward():
  pin8.write_analog(def_speed)
  pin12.write_analog(0)
  pin0.write_analog(def_speed)
  pin16.write_analog(0)
  motor_direction = 1     #movement identifier
    return
  
def move_backward():
  pin8.write_digital(0)   #motor left side
  pin12.write_digital(1)
  pin0.write_digital(0)   #motor right side
  pin16.write_digital(1)
  motor_direction = 2     #movement identifier
    return
def move_right():
  pin8.write_analog(def_speed)
  pin12.write_analog(0)
  pin0.write_analog(def_speed)
  pin16.write_analog(def_speed)
  motor_direction = 3     #movement identifier
    return
def move_left():
  pin8.write_analog(def_speed)
  pin12.write_analog(def_speed)
  pin0.write_analog(def_speed)
  pin16.write_analog(0)
  motor_direction = 4     #movement identifier
    return
def move_break():
  pin8.write_analog(def_speed)
  pin12.write_analog(def_speed)
  pin0.write_analog(def_speed)
  pin16.write_analog(def_speed)
  motor_direction = 5     #movement identifier
    return
def move_coast():
  pin8.write_digital(0)   #motor left side
  pin12.write_digital(0)
  pin0.write_digital(0)   #motor right side
  pin16.write_digital(0)
  motor_direction = 6     #movement identifier
    return

motor_direction = 0

while True:
  if (motor_direction != 1):
    if ((button_a.is_pressed() == True) & (button_b.is_pressed() == True)):
      move_forward()
      display.clear()
      display.show(Image.ARROW_N)
  
  if (motor_direction != 5):
    if ((button_a.is_pressed() == False) & (button_b.is_pressed() == False)):
      move_break()
      display.clear()
      display.scroll("Sensor error - robot STOP !!!", delay=100)
  
  if (motor_direction != 4):
    if ((button_a.is_pressed() == False) & (button_b.is_pressed() == True)):
      move_left()
      display.clear()
      display.show(Image.ARROW_NW)
    
  if (motor_direction != 3):
    if ((button_b.is_pressed() == False) & (button_a.is_pressed() == True)):
      move_right()
      display.clear()
      display.show(Image.ARROW_NE)