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Species counter

初學者 | MakeCode, Python | LED 螢幕, 按鈕 | 動物, 數字和位置值, 植物, 生態系統, 變數



Use your BBC micro:bit to help you count two different species of plants or animals in your school playground, garden or local park. You will learn about variables, and using the micro:bit's buttons and LED display.



  • The program uses variables called “A” and “B” to store the number of animals or plants counted.
  • Variables store numbers or values that can change in a computer program.
  • At the beginning of the program, “A” and “B” are set to zero and zero is shown on the LED display. You should always give variables an initial value in a computer program like this.
  • Press button A each time you see a particular animal or plant, for example, a duck, and each time one will be added to “A”.
  • Press button B each time you see another plant or animal of interest, for example, a goose, and each time one will be added to “B”.
  • Shake your micro:bit to show the totals on the LED display.


  • micro:bit (或,MakeCode simulator)
  • MakeCode編輯器
  • battery pack (optional but recommended)


1from microbit import *
3a = 0
4b = 0
7while True:
8    if button_a.is_pressed():
9        a += 1
10        display.scroll(a)
11    elif button_b.is_pressed():
12        b += 1
13        display.scroll(b)
14    if accelerometer.was_gesture('shake'):
15        display.scroll('A')
16        display.scroll(a)
17        sleep(1000)
18        display.clear()
19        sleep(2000)
20        display.scroll('B')
21        display.scroll(b)


  • Find a way of resetting the counter, for example, by pressing buttons A and B together.
  • Make a graphical representation of the number of animals or plants counted, for example, by using dots.
  • Show icons representing the animals or plants, or play sound effects, when you have reached a target number.