is_held中的gpiozero按钮问题

Question

我正在为万圣节制作一个南瓜派，但在按钮的集成方面遇到了问题；特别是is_held位。它由组成蜡烛的3个led灯组成(1个黄色闪烁，1个黄色“呼吸”，1个橙色稳定)和一个红色的led灯，当蜡烛逐渐消失时，它逐渐变暗，然后伴随着恐怖的笑声跳动。我已经集成了启动一切的按钮，但当我按住按钮停止它时，什么也没有发生。我对编码还很陌生，所以任何关于我的主要问题或反馈的帮助都是非常感谢的！

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

Answer 1

好的-所以在RPi论坛上归功于thagrol，但这里是答案。在这里，我正在控制一个LED灯序列，它使用了一个while True循环，并通过python和gpiozero使用了一个按钮。

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()