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)
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#!/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() |
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/bspbspace/article/details/51661289