无限while循环蟒蛇

Question

我做了倒车雷达raspberry pi和python

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循环不工作，也就是说，如果运动传感器触发什么也没有发生，但你可以压制按钮和计数增加。我猜这有一个简单的解决方案，但似乎没有想到。会爱你的帮助，谢谢

Answer 1

你的第二个while循环没有断点!!! 您的第一个while循环运行，直到它检测到运动，然后进入第二个循环，并且第二个循环永远运行。 如果你想要两个循环同时工作，那么你应该使用线程！ 如果不是，则在第二个循环中创建一个中断点。

简单的例子：

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