基本用法
以下示例演示了 GPIO Zero 库的部分功能。请注意，所有配方都是假设 Python 3 编写的。在 Python 2 下可能也能运行，但并不保证！
导入 GPIO Zero
在 Python 中，脚本中使用的库和函数必须在文件顶部按名称导入，Python 默认内置的函数除外。
例如，要使用 GPIO Zero 中的 Button 接口，必须明确导入：
from gpiozero import Button
现在 Button 可以直接在脚本中使用了：
button = Button(2)
或者，也可以导入整个 GPIO Zero 库：
import gpiozero
在这种情况下，对 GPIO Zero 中所有项目的引用都必须加上前缀：
button = gpiozero.Button(2)
引脚编号
该库的 GPIO 引脚使用 Broadcom (BCM) 引脚编号，而非物理 (BOARD) 编号。与 RPi.GPIO 库不同的是，它不可配置。不过，可以通过为引脚编号提供前缀来转换其他方案（见下文）。
下图中任何标有 GPIO 的引脚都可以用作引脚编号。例如，如果 LED 连接到 GPIO17，则应将引脚编号指定为 17，而不是 11：
如果希望使用物理（BOARD）编号，则可将引脚编号指定为 BOARD11。如果您熟悉 wiringPi 引脚编号（另一种物理布局），可以使用 WPI0 来代替。最后，还可以将引脚指定为 header:number（头：编号），例如 J8:11 表示头 J8（现代 Pis 上的 GPIO 头）上的物理引脚 11。因此，以下几行都是等价的：
led = LED(17)
led = LED("GPIO17")
led = LED("BCM17")
led = LED("BOARD11")
led = LED("WPI0")
led = LED("J8:11")
请注意，这些备用方案只是转换。如果您在命令行上请求设备状态，相关引脚编号将始终以 Broadcom (BCM) 方案报告：
led = LED("BOARD11")
led
<gpiozero.LED object on pin GPIO17, active_high=True, is_active=False>
在本手册中，我们将按照上图所示的 Broadcom (BCM) 布局使用默认的整数引脚编号。
LED (LED)
反复打开和关闭 LED：
from gpiozero import LED
from time import sleep
red = LED(17)
while True:
red.on()
sleep(1)
red.off()
sleep(1)
或者
from gpiozero import LED
from signal import pause
red = LED(17)
red.blink()
pause()
提示
Python 脚本结束时会终止进程，GPIO 可能会被重置。请使用 signal.pause() 使脚本继续运行。更多信息，请参阅 如何保持脚本运行？
亮度可变的 LED
任何普通 LED 都可以使用 PWM（脉宽调制）设置其亮度值。在 GPIO Zero 中，可以使用 PWMLED（亮度值在 0 和 1 之间）来实现这一功能：
from gpiozero import PWMLED
from time import sleep
led = PWMLED(17)
while True:
led.value = 0 # off
sleep(1)
led.value = 0.5 # half brightness
sleep(1)
led.value = 1 # full brightness
sleep(1)
与连续闪亮和熄灭类似，PWMLED 也可以脉冲（连续淡入淡出）：
from gpiozero import PWMLED
from signal import pause
led = PWMLED(17)
led.pulse()
pause()
按钮 (Button)
检查 Button 是否被按下：
from gpiozero import Button
button = Button(2)
while True:
if button.is_pressed:
print("Button is pressed")
else:
print("Button is not pressed")
等待按下按钮后再继续：
from gpiozero import Button
button = Button(2)
button.wait_for_press()
print("Button was pressed")
每次按下按钮都运行一个功能：
from gpiozero import Button
from signal import pause
def say_hello():
print("Hello!")
button = Button(2)
button.when_pressed = say_hello
pause()
提示
请注意，button.when_pressed = say_hello 这一行并不运行 say_hello 函数，而是创建一个指向按下按钮时要调用的函数的引用。意外使用 button.when_pressed = say_hello()，会将 when_pressed 操作设置为 None（该函数的返回值），这意味着按下按钮时什么也不会发生。
同样，按钮释放也可以附加功能：
from gpiozero import Button
from signal import pause
def say_hello():
print("Hello!")
def say_goodbye():
print("Goodbye!")
button = Button(2)
button.when_pressed = say_hello
button.when_released = say_goodbye
pause()
按钮 控制 LED
按下 Button 时打开 LED：
from gpiozero import LED, Button
from signal import pause
led = LED(17)
button = Button(2)
button.when_pressed = led.on
button.when_released = led.off
pause()
或者
from gpiozero import LED, Button
from signal import pause
led = LED(17)
button = Button(2)
led.source = button
pause()
按钮 控制 摄像头
使用 button.when_pressed = camera.capture 来触发 PiCamera 拍照是行不通的，因为 capture() 方法需要一个 输出 参数。不过，可以使用无需参数的自定义函数来实现：
from gpiozero import Button
from picamera import PiCamera
from datetime import datetime
from signal import pause
button = Button(2)
camera = PiCamera()
def capture():
camera.capture(f'/home/pi/{datetime.now():%Y-%m-%d-%H-%M-%S}.jpg')
button.when_pressed = capture
pause()
另一个例子是使用一个按钮来启动和停止摄像头预览，另一个按钮用来捕捉：
from gpiozero import Button
from picamera import PiCamera
from datetime import datetime
from signal import pause
left_button = Button(2)
right_button = Button(3)
camera = PiCamera()
def capture():
camera.capture(f'/home/pi/{datetime.now():%Y-%m-%d-%H-%M-%S}.jpg')
left_button.when_pressed = camera.start_preview
left_button.when_released = camera.stop_preview
right_button.when_pressed = capture
pause()
关机按钮
Button 类还提供了在按住按钮一定时间后运行函数的功能。本示例将在按住按钮 2 秒时关闭 Raspberry Pi：
from gpiozero import Button
from subprocess import check_call
from signal import pause
def shutdown():
check_call(['sudo', 'poweroff'])
shutdown_btn = Button(17, hold_time=2)
shutdown_btn.when_held = shutdown
pause()
LED板 (LEDBoard)
使用 LEDBoard 可以访问 LED 集合：
from gpiozero import LEDBoard
from time import sleep
from signal import pause
leds = LEDBoard(5, 6, 13, 19, 26)
leds.on()
sleep(1)
leds.off()
sleep(1)
leds.value = (1, 0, 1, 0, 1)
sleep(1)
leds.blink()
pause()
使用 pwm=True 的 LEDBoard 可以控制每个 LED 的亮度：
from gpiozero import LEDBoard
from signal import pause
leds = LEDBoard(5, 6, 13, 19, 26, pwm=True)
leds.value = (0.2, 0.4, 0.6, 0.8, 1.0)
pause()
在 高级 LEDBoard 方案 中查看更多 LEDBoard 示例。
LED条形图 (LEDBarGraph)
使用 LEDBarGraph 可以像条形图一样处理 LED 集合：
from gpiozero import LEDBarGraph
from time import sleep
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)
由于 LED 只能在 pwm=False 时开启或关闭（默认值），因此数值基本上是四舍五入的。
不过，在 pwm=True 时使用 LEDBarGraph 可以使用 LED 亮度获得更精确的数值：
from gpiozero import LEDBarGraph
from time import sleep
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)
LED字符显示屏 (LEDCharDisplay)
使用 LEDCharDisplay（实际上支持任意数量的显示段），可以用普通的 7 段显示 来表示各种字符：
from gpiozero import LEDCharDisplay
from time import sleep
display = LEDCharDisplay(21, 20, 16, 22, 23, 24, 12, dp=25)
for char in '321GO':
display.value = char
sleep(1)
display.off()
或者
from gpiozero import LEDCharDisplay
from signal import pause
display = LEDCharDisplay(21, 20, 16, 22, 23, 24, 12, dp=25)
display.source_delay = 1
display.source = '321GO '
pause()
在 高级 LEDBoard 方案 中查看更多多字符示例。
交通信号灯 (TrafficLights)
完整的交通灯系统
使用像 Pi-Stop 这样的 TrafficLights 套件：
from gpiozero import TrafficLights
from time import sleep
lights = TrafficLights(2, 3, 4)
lights.green.on()
while True:
sleep(10)
lights.green.off()
lights.amber.on()
sleep(1)
lights.amber.off()
lights.red.on()
sleep(10)
lights.amber.on()
sleep(1)
lights.green.on()
lights.amber.off()
lights.red.off()
或者
from gpiozero import TrafficLights
from time import sleep
from signal import pause
lights = TrafficLights(2, 3, 4)
def traffic_light_sequence():
while True:
yield (0, 0, 1) # green
sleep(10)
yield (0, 1, 0) # amber
sleep(1)
yield (1, 0, 0) # red
sleep(10)
yield (1, 1, 0) # red+amber
sleep(1)
lights.source = traffic_light_sequence()
pause()
使用 LED 组件:
from gpiozero import LED
from time import sleep
red = LED(2)
amber = LED(3)
green = LED(4)
green.on()
amber.off()
red.off()
while True:
sleep(10)
green.off()
amber.on()
sleep(1)
amber.off()
red.on()
sleep(10)
amber.on()
sleep(1)
green.on()
amber.off()
red.off()
组合设计
按钮定格
每次按下按钮时，摄像头模块都会拍摄一张照片：
from gpiozero import Button
from picamera import PiCamera
button = Button(2)
camera = PiCamera()
camera.start_preview()
frame = 1
while True:
button.wait_for_press()
camera.capture(f'/home/pi/frame{frame:03d}.jpg')
frame += 1
请参阅 按钮定格 获取完整资源。
反应游戏
当看到灯亮起时，最先按下按钮的人获胜！
from gpiozero import Button, LED
from time import sleep
import random
led = LED(17)
player_1 = Button(2)
player_2 = Button(3)
time = random.uniform(5, 10)
sleep(time)
led.on()
while True:
if player_1.is_pressed:
print("Player 1 wins!")
break
if player_2.is_pressed:
print("Player 2 wins!")
break
led.off()
请参阅 快速反应游戏 获取完整资源。
GPIO音乐盒
每个按钮都会发出不同的声音！
from gpiozero import Button
import pygame.mixer
from pygame.mixer import Sound
from signal import pause
pygame.mixer.init()
button_sounds = {
Button(2): Sound("samples/drum_tom_mid_hard.wav"),
Button(3): Sound("samples/drum_cymbal_open.wav"),
}
for button, sound in button_sounds.items():
button.when_pressed = sound.play
pause()
请参阅 GPIO音乐盒 获取完整资源。
按下时全部打开
FishDish：
按下按钮时，蜂鸣器和所有指示灯都会亮起。
from gpiozero import FishDish
from signal import pause
fish = FishDish()
fish.button.when_pressed = fish.on
fish.button.when_released = fish.off
pause()
Ryanteck TrafficHat：（译注：由 Ryanteck 出品的 交通灯 小板）
from gpiozero import TrafficHat
from signal import pause
th = TrafficHat()
th.button.when_pressed = th.on
th.button.when_released = th.off
pause()
使用 LED，Buzzer，和 Button 组件：
from gpiozero import LED, Buzzer, Button
from signal import pause
button = Button(2)
buzzer = Buzzer(3)
red = LED(4)
amber = LED(5)
green = LED(6)
things = [red, amber, green, buzzer]
def things_on():
for thing in things:
thing.on()
def things_off():
for thing in things:
thing.off()
button.when_pressed = things_on
button.when_released = things_off
pause()
全彩LED (RGBLED)
用 RGBLED 制作色彩：
from gpiozero import RGBLED
from time import sleep
led = RGBLED(red=9, green=10, blue=11)
led.red = 1 # full red
sleep(1)
led.red = 0.5 # half red
sleep(1)
led.color = (0, 1, 0) # full green
sleep(1)
led.color = (1, 0, 1) # magenta
sleep(1)
led.color = (1, 1, 0) # yellow
sleep(1)
led.color = (0, 1, 1) # cyan
sleep(1)
led.color = (1, 1, 1) # white
sleep(1)
led.color = (0, 0, 0) # off
sleep(1)
# slowly increase intensity of blue
for n in range(100):
led.blue = n/100
sleep(0.1)
运动传感器 (MotionSensor)
当 MotionSensor(运动传感器) 检测到运动时，点亮 LED：
from gpiozero import MotionSensor, LED
from signal import pause
pir = MotionSensor(4)
led = LED(16)
pir.when_motion = led.on
pir.when_no_motion = led.off
pause()
光传 感器 (LightSensor)
让 LightSensor(光传感器) 检测明暗：
from gpiozero import LightSensor
sensor = LightSensor(18)
while True:
sensor.wait_for_light()
print("It's light! :)")
sensor.wait_for_dark()
print("It's dark :(")
在光线变化时运行功能：
from gpiozero import LightSensor, LED
from signal import pause
sensor = LightSensor(18)
led = LED(16)
sensor.when_dark = led.on
sensor.when_light = led.off
pause()
或使 PWMLED 根据检测到的光亮度改变亮度：
from gpiozero import LightSensor, PWMLED
from signal import pause
sensor = LightSensor(18)
led = PWMLED(16)
led.source = sensor
pause()
距离传感器 (DistanceSensor)
提示
在上图中，从传感器到面包板的导线可以省略；只需将传感器直接插入面包板，面向边缘即可（遗憾的是，如果传感器的示意图没有遮住面包板的大部分，就很难在图中说明这一点！）。
让距离传感器(DistanceSenso) 检测最近物体的距离：
from gpiozero import DistanceSensor
from time import sleep
sensor = DistanceSensor(23, 24)
while True:
print('Distance to nearest object is', sensor.distance, 'm')
sleep(1)
当有东西靠近传感器时，运行一个功能：
from gpiozero import DistanceSensor, LED
from signal import pause
sensor = DistanceSensor(23, 24, max_distance=1, threshold_distance=0.2)
led = LED(16)
sensor.when_in_range = led.on
sensor.when_out_of_range = led.off
pause()
旋转编码器 (RotaryEncoder)
提示
在本方案中，使用的是普通阳极 RGB LED。通常情况下，Pi 项目会使用共阴极 RGB LED，因为它们在电气上更容易理解。但在本例中，所有三个元件都可以在一个发光旋转编码器中找到，该编码器包含一个共阳极 RGB LED 和一个瞬时按钮。这 也是按钮为低电平有效接线的原因，与本文档中的大多数其他示例相反。
为清晰起见，图中显示了三个独立的组件，但同样的电路也可以用这种常见的 发光旋转编码器 代替。
将旋转编码器(RotaryEncoder)、RGBLED 和按钮(Button) 作颜色选择器：
from threading import Event
from colorzero import Color
from gpiozero import RotaryEncoder, RGBLED, Button
rotor = RotaryEncoder(16, 20, wrap=True, max_steps=180)
rotor.steps = -180
led = RGBLED(22, 23, 24, active_high=False)
btn = Button(21, pull_up=False)
led.color = Color('#f00')
done = Event()
def change_hue():
# Scale the rotor steps (-180..180) to 0..1
hue = (rotor.steps + 180) / 360
led.color = Color(h=hue, s=1, v=1)
def show_color():
print(f'Hue {led.color.hue.deg:.1f}° = {led.color.html}')
def stop_script():
print('Exiting')
done.set()
print('Select a color by turning the knob')
rotor.when_rotated = change_hue
print('Push the button to see the HTML code for the color')
btn.when_released = show_color
print('Hold the button to exit')
btn.when_held = stop_script
done.wait()
伺服 (Servo)
依次在最小位置、中间位置和最大位置之间控制伺服(Servo)：
from gpiozero import Servo
from time import sleep
servo = Servo(17)
while True:
servo.min()
sleep(2)
servo.mid()
sleep(2)
servo.max()
sleep(2)
使用按钮在最小和最大位置之间控制伺服(Servo)：
from gpiozero import Servo, Button
servo = Servo(17)
btn = Button(14)
while True:
servo.min()
btn.wait_for_press()
servo.max()
btn.wait_for_press()
自动伺服(Servo)连续缓慢扫动：
rom gpiozero import Servo
from gpiozero.tools import sin_values
from signal import pause
servo = Servo(17)
servo.source = sin_values()
servo.source_delay = 0.1
pause()
使用角度伺服(AngularServo)可以指定角度：
from gpiozero import AngularServo
from time import sleep
servo = AngularServo(17, min_angle=-90, max_angle=90)
while True:
servo.angle = -90
sleep(2)
servo.angle = -45
sleep(2)
servo.angle = 0
sleep(2)
servo.angle = 45
sleep(2)
servo.angle = 90
sleep(2)
电机 (Motor)
正向和反向旋转电机(Motor)：
from gpiozero import Motor
from time import sleep
motor = Motor(forward=4, backward=14)
while True:
motor.forward()
sleep(5)
motor.backward()
sleep(5)
机器人 (Robot)
让机器人(Robot) 在（大致）一个正方形内行驶：
from gpiozero import Robot, Motor
from time import sleep
robot = Robot(left=Motor(4, 14), right=Motor(17, 18))
for i in range(4):
robot.forward()
sleep(10)
robot.right()
sleep(1)
制作一个带有距离传感器(DistanceSensor)的机器人(Robot)，当物体靠近它 20 厘米以内时，它就会逃跑：
from gpiozero import Robot, Motor, DistanceSensor
from signal import pause
sensor = DistanceSensor(23, 24, max_distance=1, threshold_distance=0.2)
robot = Robot(left=Motor(4, 14), right=Motor(17, 18))
sensor.when_in_range = robot.backward
sensor.when_out_of_range = robot.stop
pause()
组合控制
按钮控制机器人
将四个 GPIO 按钮用作机器人(Robot)的前进/后退/左转/右转控制器：
from gpiozero import Robot, Motor, Button
from signal import pause
robot = Robot(left=Motor(4, 14), right=Motor(17, 18))
left = Button(26)
right = Button(16)
fw = Button(21)
bw = Button(20)
fw.when_pressed = robot.forward
fw.when_released = robot.stop
left.when_pressed = robot.left
left.when_released = robot.stop
right.when_pressed = robot.right
right.when_released = robot.stop
bw.when_pressed = robot.backward
bw.when_released = robot.stop
pause()
键盘控制机器人
使用上/下/左/右键控制机器人(Robot)：
import curses
from gpiozero import Robot, Motor
robot = Robot(left=Motor(4, 14), right=Motor(17, 18))
actions = {
curses.KEY_UP: robot.forward,
curses.KEY_DOWN: robot.backward,
curses.KEY_LEFT: robot.left,
curses.KEY_RIGHT: robot.right,
}
def main(window):
next_key = None
while True:
curses.halfdelay(1)
if next_key is None:
key = window.getch()
else:
key = next_key
next_key = None
if key != -1:
# KEY PRESSED
curses.halfdelay(3)
action = actions.get(key)
if action is not None:
action()
next_key = key
while next_key == key:
next_key = window.getch()
# KEY RELEASED
robot.stop()
curses.wrapper(main)
提示
本教程使用标准的 curses 模块。该模块要求 Python 在终端中运行才能正常工作，因此该方案无法在 IDLE 等环境中运行。
如果你更喜欢在 IDLE 下运行的版本，下面的方案就足够了：
from gpiozero import Robot, Motor
from evdev import InputDevice, list_devices, ecodes
robot = Robot(left=Motor(4, 14), right=Motor(17, 18))
# Get the list of available input devices
devices = [InputDevice(device) for device in list_devices()]
# Filter out everything that's not a keyboard. Keyboards are defined as any
# device which has keys, and which specifically has keys 1..31 (roughly Esc,
# the numeric keys, the first row of QWERTY plus a few more) and which does
# *not* have key 0 (reserved)
must_have = {i for i in range(1, 32)}
must_not_have = {0}
devices = [
dev
for dev in devices
for keys in (set(dev.capabilities().get(ecodes.EV_KEY, [])),)
if must_have.issubset(keys)
and must_not_have.isdisjoint(keys)
]
# Pick the first keyboard
keyboard = devices[0]
keypress_actions = {
ecodes.KEY_UP: robot.forward,
ecodes.KEY_DOWN: robot.backward,
ecodes.KEY_LEFT: robot.left,
ecodes.KEY_RIGHT: robot.right,
}
for event in keyboard.read_loop():
if event.type == ecodes.EV_KEY and event.code in keypress_actions:
if event.value == 1: # key pressed
keypress_actions[event.code]()
if event.value == 0: # key released
robot.stop()
提示
本方案使用第三方 evdev 模块。请先使用 sudo pip3 install evdev 安装该库。请注意，evdev 只适用于本地输入设备；本方案无法通过 SSH 运行。
运动传感器机器人
让机器人在检测到运动时向前驱动：
from gpiozero import Robot, Motor, MotionSensor
from signal import pause
robot = Robot(left=Motor(4, 14), right=Motor(17, 18))
pir = MotionSensor(5)
pir.when_motion = robot.forward
pir.when_no_motion = robot.stop
pause()
或者
from gpiozero import Robot, Motor, MotionSensor
from gpiozero.tools import zip_values
from signal import pause
robot = Robot(left=Motor(4, 14), right=Motor(17, 18))
pir = MotionSensor(5)
robot.source = zip_values(pir, pir)
pause()
电位器
连续打印连接到 MCP3008 模数转换器的电位计的数值（数值 在 0 和 1 之间）：
from gpiozero import MCP3008
pot = MCP3008(channel=0)
while True:
print(pot.value)
使用 PWM 在 LED 柱状图上显示电位器的值，以表示不会 "填满" LED 的状态：
from gpiozero import LEDBarGraph, MCP3008
from signal import pause
graph = LEDBarGraph(5, 6, 13, 19, 26, pwm=True)
pot = MCP3008(channel=0)
graph.source = pot
pause()
使用 ADC 测量温度
将 TMP36 温度传感器连接到 MCP3008 模数转换器的第一通道：
from gpiozero import MCP3008
from time import sleep
def convert_temp(gen):
for value in gen:
yield (value * 3.3 - 0.5) * 100
adc = MCP3008(channel=0)
for temp in convert_temp(adc.values):
print('The temperature is', temp, 'C')
sleep(1)
3个电位器控制的全彩LED
连接三个电位器（红、绿、蓝），用每个电位器的值组成 LED 的颜色：
from gpiozero import RGBLED, MCP3008
led = RGBLED(red=2, green=3, blue=4)
red_pot = MCP3008(channel=0)
green_pot = MCP3008(channel=1)
blue_pot = MCP3008(channel=2)
while True:
led.red = red_pot.value
led.green = green_pot.value
led.blue = blue_pot.value
另外，下面的示例与此相同，但使用的是 source 属性而不是 while 循环：
from gpiozero import RGBLED, MCP3008
from gpiozero.tools import zip_values
from signal import pause
led = RGBLED(2, 3, 4)
red_pot = MCP3008(0)
green_pot = MCP3008(1)
blue_pot = MCP3008(2)
led.source = zip_values(red_pot, green_pot, blue_pot)
pause()
定时加热灯
如果您饲养的宠物（如乌龟）需要每天在一定时间内打开保温灯，您可以使用 Energenie Pi-mote 远程控制保温灯，并使用 TimeOfDay 类来控制时间：
from gpiozero import Energenie, TimeOfDay
from datetime import time
from signal import pause
lamp = Energenie(1)
daytime = TimeOfDay(time(8), time(20))
daytime.when_activated = lamp.on
daytime.when_deactivated = lamp.off
pause()
互联网连接状态指示灯
您可以使用一对绿色和红色 LED 灯来指示互联网连接是否正常。只需使用 PingServer 类即可识别 ping 到 baidu.com 是否成功。如果成功，则点亮绿色 LED 灯；如果不成功，则点亮红色 LED 灯：
from gpiozero import LED, PingServer
from gpiozero.tools import negated
from signal import pause
green = LED(17)
red = LED(18)
google = PingServer('baidu.com')
google.when_activated = green.on
google.when_deactivated = green.off
red.source = negated(green)
pause()
CPU温度条形图
您可以使用内置的 CPUTemperature 类读取 Raspberry Pi 自身 CPU 的温度，并将其显示在 LED 的 "条形图" 上：
from gpiozero import LEDBarGraph, CPUTemperature
from signal import pause
cpu = CPUTemperature(min_temp=50, max_temp=90)
leds = LEDBarGraph(2, 3, 4, 5, 6, 7, 8, pwm=True)
leds.source = cpu
pause()
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