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                ## LEDBarGraph >![](https://img.kancloud.cn/79/f1/79f10c1f13d12c8b83bc2fcb25eaf9f3_512x399.png) 左上角的條狀圖就是這個類要實現的效果了,就是有若干個指示燈,用亮度來表示不同的范圍。微軟為microbit寫的圖形化編輯器makecode中也有類似的積木塊: ![](https://img.kancloud.cn/66/f4/66f4754110be8c0549c043a69817f0db_929x498.png) 利用`LEDBarGraph`類,我們可以把若干個LED燈的集合看做是一個條形圖。 ~~~ from gpiozero import LEDBarGraph from time import sleep from __future__ import division # required for python 2 graph = LEDBarGraph(5, 6, 13, 19, 26, 20) graph.value = 1 # (1, 1, 1, 1, 1, 1) sleep(1) graph.value = 1/2 # (1, 1, 1, 0, 0, 0) sleep(1) graph.value = -1/2 # (0, 0, 0, 1, 1, 1) sleep(1) graph.value = 1/4 # (1, 0, 0, 0, 0, 0) sleep(1) graph.value = -1 # (1, 1, 1, 1, 1, 1) sleep(1) ~~~ 雖然本質上當`pwm=False`(默認)的時候,LED只有開和關兩種狀態。 但是在使用`LEDBarGraph`的時候,如果我們把pwm設置為真`pwm=True`,那么利用LED亮度來表示條形圖會更加精確。 ~~~ from gpiozero import LEDBarGraph from time import sleep from __future__ import division # required for python 2 graph = LEDBarGraph(5, 6, 13, 19, 26, pwm=True) graph.value = 1/10 # (0.5, 0, 0, 0, 0) sleep(1) graph.value = 3/10 # (1, 0.5, 0, 0, 0) sleep(1) graph.value = -3/10 # (0, 0, 0, 0.5, 1) sleep(1) graph.value = 9/10 # (1, 1, 1, 1, 0.5) sleep(1) graph.value = 95/100 # (1, 1, 1, 1, 0.75) sleep(1) ~~~
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