如何在python中添加硬件控制的定时延迟

我已经在Raspberry PI上构建了一些Python代码来控制车库门。但是,我不知道如何添加一个定时延迟,以便控制被限制在正确的移动时间内。

任何帮助都将不胜感激。

我的工作代码如下。

    import RPi.GPIO as GPIO          
    from time import sleep

    in1 = 24
    in2 = 23
    en = 25
    temp1=1

   GPIO.setmode(GPIO.BCM)
   GPIO.setup(in1,GPIO.OUT)
   GPIO.setup(in2,GPIO.OUT)
   GPIO.setup(en,GPIO.OUT)
   GPIO.output(in1,GPIO.LOW)
   GPIO.output(in2,GPIO.LOW)
   p=GPIO.PWM(en,1000)
   p.start(25)
   print("\n")
   print("The default speed & direction of motor is LOW & Forward.....")
   print("r-run s-stop f-forward b-backward l-low m-medium h-high e-exit")
   print("\n")    

   while(1):
   x = input()
   if x=='r':
   print("run")
   if(temp1==1):
   GPIO.output(in1,GPIO.HIGH)
   GPIO.output(in2,GPIO.LOW)
   print("forward")
   x='z'
   else:
   GPIO.output(in1,GPIO.LOW)
   GPIO.output(in2,GPIO.HIGH)
   print("backward")
   x='z'


   elif x=='s':
   print("stop")
   GPIO.output(in1,GPIO.LOW)
   GPIO.output(in2,GPIO.LOW)
   x='z'

   elif x=='f':
   print("forward")
   GPIO.output(in1,GPIO.HIGH)
   GPIO.output(in2,GPIO.LOW)
   temp1=1
   x='z'

   elif x=='b':
   print("backward")
   GPIO.output(in1,GPIO.LOW)
   GPIO.output(in2,GPIO.HIGH)
   temp1=0
   x='z'

   elif x=='l':
   print("low")
   p.ChangeDutyCycle(25)
   x='z'

   elif x=='m':
   print("medium")
   p.ChangeDutyCycle(50)
   x='z'

   elif x=='h':
   print("high")
   p.ChangeDutyCycle(75)
   x='z'


    elif x=='e':
    GPIO.cleanup()
    break

    else:
    print("<<<  wrong data  >>>")
    print("please enter the defined data to continue.....")