python树莓派红外反射传感器

#!/usr/bin/python# -*- coding:utf-8 -*-import RPi.GPIO as GPIOimport time Clock = 16Address = 20DataOut = 21DOUT = 17  def ADC_Read(channel): value = 0; for i in range(0,4): if((channel >> (3 - i)) & 0x01):  GPIO.output(Address,GPIO.HIGH) else:  GPIO.output(Address,GPIO.LOW) GPIO.output(Clock,GPIO.HIGH) GPIO.output(Clock,GPIO.LOW) for i in range(0,6): GPIO.output(Clock,GPIO.HIGH) GPIO.output(Clock,GPIO.LOW) time.sleep(0.001) for i in range(0,10): GPIO.output(Clock,GPIO.HIGH) value <<= 1 if(GPIO.input(DataOut)):  value |= 0x01 GPIO.output(Clock,GPIO.LOW) return value GPIO.setmode(GPIO.BCM)GPIO.setwarnings(False)GPIO.setup(Clock,GPIO.OUT)GPIO.setup(Address,GPIO.OUT)GPIO.setup(DataOut,GPIO.IN,GPIO.PUD_UP)GPIO.setup(DOUT,GPIO.IN) lastdata = 2try: while True: data = GPIO.input(DOUT) if lastdata and (lastdata == 1):  continue if data == 0:  print 'Near the Obstacles'  print 'AD: %d ' % ADC_Read(6) if data == 1:  print 'Far the Obstacles' lastdata = data time.sleep(0.1)except: GPIO.cleanup()