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我正在为万圣节制作南瓜派，但在集成按钮时遇到了问题；特别是 is_held 位。它由组成蜡烛的 3 个 LED 灯（1 个黄色闪烁、1 个黄色“呼吸”和 1 个橙色稳定）和一个红色 LED 灯组成，当蜡烛消失时逐渐变亮，然后发出令人毛骨悚然的笑声。我已经集成了按钮来启动一切，但是当我按住按钮停止它时，什么也没有发生。我对编码很陌生，因此对于我的主要问题或一般反馈的任何帮助表示赞赏！

from gpiozero import PWMLED, Button
from gpiozero.tools import random_values
from signal import pause
from time import sleep
import subprocess
import random

led_flicker_yellow = PWMLED(17, frequency = 1500)
led_breath_yellow = PWMLED(18, frequency = 1500)
led_steady_orange = PWMLED(27, frequency = 1500)
led_red = PWMLED(24, frequency = 1500)
button = Button(2, hold_time = 2)


def candle_lights():
    led_flicker_yellow.source = random_values()
    led_flicker_yellow.souce_delay = random.uniform(0.05,0.1)
    led_breath_yellow.pulse(15,10)
    led_steady_orange.value = 0.20

def candle_out():
    led_flicker_yellow.source = led_pulse_yellow
    led_breath_yellow.pulse(0,3, n=1)
    led_steady_orange.off()

def pumpkin_pi():                      
    subprocess.Popen (["omxplayer", "-o", "alsa", "--loop", "/home/pi/Desktop/LED_PROJECTS/SoundEffects/candle.mp3"])
    while True:
        candle_lights()       
        sleep(300)
        candle_out()
        subprocess.Popen(["omxplayer", "-o", "alsa", "/home/pi/Desktop/LED_PROJECTS/SoundEffects/laugh.mp3"])
        led_red.pulse(3,0,n=1)
        sleep(3)
        led_red.blink(0.03,0.03,n=35)
        sleep(2)
        candle_lights()
        if button.is_held:
            subprocess.call(["pkill", "omx"])
            break

button.when_pressed = pumpkin_pi
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1 回答 1

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好的 - 这要归功于 RPi 论坛上的 thagrol，但这是答案。在这里，我正在通过 python 和 gpiozero 控制一个使用带有按钮的 while True 循环的 LED 灯序列。

from gpiozero import PWMLED, Button
from time import sleep 
from signal import pause
import threading

led = PWMLED(24)
button = Button(2, hold_time=2)

running = False

def pumpkin_pi_loop():
    while running:
        led.value = 0 
        sleep(1)
        led.value = 0.5
        sleep(1)
        led.value = 1
        sleep(1)
        
def button_press():
    global running
    if not running:
        led.value = 1
        sleep(3)
        running = True
        loop_thread = threading.Thread(target=pumpkin_pi_loop, daemon=True)
        loop_thread.start()
    else:
        running = False

def button_hold():
    global running
    running = False

button.when_pressed = button_press
button.when_held = button_hold


pause()
于 2020-06-26T22:46:10.933 回答