python树莓派红外反射传感器

本文实例为大家分享了python树莓派红外反射传感器的程序，供大家参考，具体内容如下

1、工具

rpi3，微雪ARPI600，Infrared Reflective Sensor

2、基本原理

Infrared Reflective Sensor 输出数字和模拟信号

模拟信号通过ARPI600上的AD转换芯片TLC1543进行转换

TLC1543通信使用rpi的GPIO口，模拟SPI，进行模拟信号输入端口选择，和输出读取

程序通过读取DOUT判断与障碍物接近和远离

在接近障碍物时读取AD转换数值

3、连接实物

4、python程序（根据ARPI600提供程序修改）

#!/usr/bin/python
# -*- coding:utf-8 -*-
import RPi.GPIO as GPIO
import time

Clock = 16
Address = 20
DataOut = 21
DOUT = 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 = 2
try:
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()

来源：https://blog.csdn.net/bspbspace/article/details/51661289