光能计时器

1from microbit import *
2display.show('L')
3
4LIGHT = 100  # <<< Enter your 'measured' reading here
5
6HYSTERESIS = 8
7LIGHT -= (HYSTERESIS/2)
8DARK = LIGHT - HYSTERESIS
9ON_IMAGE = Image('99999:99999:99999:99999:99999')
10OFF_IMAGE = Image('00000:00000:00900:00000:00000')
11timing = False
12start_time = 0
13total_time = 0
14reading = display.read_light_level()
15sleep(1000)
16
17def show_number(n):
18    # Make number display the same as MakeCode
19    if len(str(n)) == 1:
20        display.show(n)
21    else:
22        display.scroll(n)
23
24while True:
25    reading = display.read_light_level()
26    if reading < DARK:
27        if timing:
28            # it has just gone dark, update timer for 'on' time
29            end_time = running_time()
30            total_time += (end_time - start_time)
31            timing = False
32        
33    elif reading >= LIGHT:
34        if not timing:
35            # it has just gone light, start the timer
36            start_time = running_time()
37            timing = True
38        
39    if button_b.was_pressed():
40        # calculate and display cumulative time in minutes
41        minutes = total_time / 60000
42        if timing:
43            # adjust live for current ON time
44            minutes += (running_time() - start_time) / 60000
45        display.clear()
46        show_number(round(minutes))  # whole numbers only
47        sleep(500)
48
49    # update the display with the ON/OFF state
50    if timing:
51        display.show(ON_IMAGE)
52    else:
53        display.show(OFF_IMAGE)
54    sleep(1000)
55
56