text: #!/usr/bin/env python3
  # -*- coding: UTF-8 -*-
  
  # 生物红外感知传感器使用示例
  
  import RPi.GPIO as GPIO  
  import time  
  #import picamera  
  
  gpio = 17
  #初始化  
  def init():  
      #设置不显示警告  
      GPIO.setwarnings(False)  
      #设置读取面板针脚模式  
      GPIO.setmode(GPIO.BCM)  
      #设置读取针脚标号  
      GPIO.setup(gpio,GPIO.IN)  
      pass  
     
  def detct():  
      while True:  
          #当高电平信号输入时报警  
          if GPIO.input(gpio) == True:
              curtime = time.strftime('%Y-%m-%d-%H-%M-%S',time.localtime(time.time()))
              alart(curtime)  
          time.sleep(3)  
    
  def alart(curtime):  
      print(curtime + " Someone is coming!")  
    
  init()
  print("start")
  detct()  
  GPIO.cleanup()  
  