无限while循环python

Question

我正在用raspberry pi 和python 做一个停车传感器

这是代码：

import RPi.GPIO as GPIO
import time
#from picamera import PiCamera
from time import sleep
from gpiozero import MotionSensor
import smtplib

sender = '*****@gmail.com'
reciever = '*****@gmail.com'

def BlueLED (): #Blue LED Function 

    GPIO.output(27, GPIO.HIGH)
    time.sleep(3)
    GPIO.output(27, GPIO.LOW)


def RedLED (): #Red LED Function

    GPIO.output(22,GPIO.HIGH)
    time.sleep(3)
    GPIO.output(22, GPIO.LOW)

def Buzzer (): #Buzzer Function 

    GPIO.output(17, GPIO. HIGH)
    time.sleep(3)
    GPIO.output(17, GPIO.LOW)


def email(sender,reciever,msg):
    try :
        server = smtplib.SMTP('smtp.gmail.com',587)
        server.ehlo()
        server.starttls()
        server.login(sender,'******')
        server.sendmail(sender,reciever,msg)
        server.close()

        print('Email sent!')

    except :
        print('Error')

try :

    GPIO.setmode(GPIO.BCM)
    #camera = PiCamera()
    pir = MotionSensor(4)
    GPIO.setwarnings(False)


    GPIO.setup(27, GPIO.OUT) #blueLED
    GPIO.setup(22, GPIO.OUT) #redLED
    GPIO.setup(17, GPIO.OUT) #buzzer
    GPIO.setup(18, GPIO.OUT) #tempsensor

    GPIO.setup(21, GPIO.IN, pull_up_down = GPIO.PUD_UP) #entry button

    count = 0

    while True :

        if (pir.motion_detected):
            print('Motion Detected')

            #Calling the buzzer function 
            #Buzzer()

            #The content that is going to be sent via email 


            msg = """Subject : Car Park 

            (Picture) """

            email(sender,reciever,msg)




            print('\nPlease press the button for the gate to open')



            while True :

                if(GPIO.input(21) == False):
                    if (count < 5):
                        BlueLED()
                        print('\nThere are ',(5-count), ' parking spaces empty ')

                    else :
                        RedLED()
                        print('\nSorry but the parking is full')

                    count = count + 1



except Exception as ex :
    print('Error occured',ex)

我的问题是第一个 while 循环不起作用，即如果触发了运动传感器，则没有任何反应，但您可以重新按下按钮并增加计数。我猜想有一个简单的解决方案，但似乎没有想到。希望得到您的帮助，谢谢

Answer 1

你的第二个 while 循环没有断点！！！ 您的第一个 while 循环一直运行，直到它检测到运动，然后进入第二个循环，而您的第二个循环将永远运行。 如果您希望两个循环同时工作，那么您应该使用线程！！！ 如果没有，则在第二个循环中设置一个断点。

简单示例：

import time
count=0
count2=0
while True:    #starting first loop 
    count+=1 # counting to 100 to start second loop
    if count==100:
        print("its 100 entering second loop")
        time.sleep(1)
        while True: # entering second loop
            count2+=1 #counting to 100 to exit second loop 
            if count2==100:
                print("its 100 exitin second loop")
                time.sleep(1)
                count=0
                count2=0
                break # exiting second loop this is the break point