text: from microbit import *
  from tm1637 import TM1637
  
  tm = TM1637(clk=pin1, dio=pin2)
  
  tm.show('stop')
  
  num = 0
  started = False
  
  while True:
      if button_a.was_pressed():
          # start/stop
          started = not started
      if button_b.was_pressed():
          # reset
          num = 0
          started = False
          tm.number(num)
      if started:
          num = num + 1
          tm.number(num)
      sleep(1000)
  