linkageSystem--串口通信、socket.io

实现功能：页面切换选中的led，通过websocket告知后台，后台通过serialport发送消息给串口。反之，串口发消息给后台，后台再把消息传递给页面，页面切换选中的led。

安装模块：npm install serialport --save

　　　　　npm install socket.io --save　

代码结构：

服务端代码：

server.js

var http = require('http');
var fs = require('fs');
var mySerial = require('./serial');
var websocket = require('socket.io');

var socketIo = websocket.listen(80);

var server = http.createServer(function(request,response){
    console.log(request.url)
    fs.readFile(__dirname+request.url,function(err,data){ 
      response.setHeader("Server","TestName");     
      response.setHeader("Expires", 'Wed, 28 May 2017 09:54:57 GMT');
      response.setHeader("Cache-Control", "max-age=10000000000");
      //ajax访问时，没它会报错
      response.setHeader("Access-Control-Allow-Origin", "*");
      //返回类型
      response.writeHead(200, {'Content-Type': 'text/html'}); 
      response.end(data); 
    });   
});

socketIo.on('connection', function(socket){
    console.log('a user connected');
    socket.on("disconnect", function() {
        console.log("a user go out");
    });
    socket.on("msgFromBroswer", function(obj) {
        mySerial.sendData(obj.msg);
        // socketIo.emit("msgFromServer", obj);
        console.log(obj);
        console.log(obj.msg);
    });
});

server.listen(3000);
console.log('listening port 3000');

function sendDataToBroswer(data){
  var data1 = {msg:data}
  socketIo.emit("msgFromServer", data1);
}
exports.sendDataToBroswer = sendDataToBroswer;

serial.js

var SerialPortPackage = require("serialport").SerialPort;
var myServer = require('./server');
var Port =  SerialPortPackage.SerialPort;
var port2 = new Port("COM2", {
  baudrate: 115200
}); 

port2.on("data",function(data){
  data = +data;
  myServer.sendDataToBroswer(data);
});

function writeAndDrain (data,callback) {
  port2.write(data, function () {
    port2.drain(callback);
  });
}
function sendMsgToSerial(data){
  writeAndDrain(data,function(){
    console.log('ok');
  })
}
exports.sendData = sendMsgToSerial;

客户端代码：

index.js

$(function(){
  var socket = io.connect('ws://127.0.0.1:80');
  var buttonList = $('[data-button-list]');
  var ledList = $('[data-led-list]');

  buttonList.delegate('button','click',function(){
    var buttonIndex = $(this).attr('data-button-index');
    var targetLed = $('[data-led-index='+buttonIndex+']');
    $('[data-led-index]').removeClass('light-circle');
    $('[data-led-index]').addClass('gray-circle');
    targetLed.addClass('light-circle');
    targetLed.removeClass('gray-circle');
    socket.emit("msgFromBroswer", {"name" : navigator.userAgent, "msg" : buttonIndex});
  });
    // socket.emit("msgFromBroswer", {"name" : navigator.userAgent, "msg" : "hello world"});
    socket.on("msgFromServer", function(obj) {
        console.log(obj);
        var indexNum = obj.msg;
        var targetLed  = $('[data-led-index='+indexNum+']');
        $('[data-led-index]').removeClass('light-circle');
        $('[data-led-index]').addClass('gray-circle');
        targetLed.addClass('light-circle');
        targetLed.removeClass('gray-circle');
    });
});

index.html

<html>
  <head>
    <title>linkage system</title>
    <link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css">
    <script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
    <script src="https://cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
    <script src="http://cdn.bootcss.com/socket.io/2.0.1/socket.io.js"></script>
    <script src="./index.js"></script>
    <style>
      .light-circle{
         100px;
        height: 100px;
        background-color: red;
        color: white;
        text-align: center;
        border-radius: 50px;
        /*border:1px solid black ;*/
      }
      .gray-circle{
         100px;
        height: 100px;
        background-color: #F7F7F9;
        color: white;
        text-align: center;
        border-radius: 50px;
        /*border:1px solid black ;*/
      }
      .myButton{
        margin:10px 0 0 22px;
      }
    </style>
  </head>
  <body>

    <h3 style="text-align:center">linkage system</h3>
    <div class="row" data-led-list>
      <div class="col-md-1"></div>
      <div class="col-md-1"></div>
      <div class="col-md-1"><div data-led-index="1" class="gray-circle"></div></div>
      <div class="col-md-1"><div data-led-index="2" class="gray-circle"></div></div>
      <div class="col-md-1"><div data-led-index="3" class="gray-circle"></div></div>
      <div class="col-md-1"><div data-led-index="4" class="gray-circle"></div></div>
      <div class="col-md-1"><div data-led-index="5" class="gray-circle"></div></div>
      <div class="col-md-1"><div data-led-index="6" class="gray-circle"></div></div>
      <div class="col-md-1"><div data-led-index="7" class="gray-circle"></div></div>
      <div class="col-md-1"><div data-led-index="8" class="gray-circle"></div></div>
      <div class="col-md-1"></div>
      <div class="col-md-1"></div>
    </div>
    <div class="row" data-button-list>
      <div class="col-md-1"></div>
      <div class="col-md-1"></div>
      <div class="col-md-1">
        <button type="button" class="myButton btn btn-default" data-button-index="1">light</button>
      </div>
      <div class="col-md-1">
        <button type="button" class="myButton btn btn-default" data-button-index="2">light</button>
      </div>
      <div class="col-md-1">
        <button type="button" class="myButton btn btn-default" data-button-index="3">light</button>
      </div>
      <div class="col-md-1">
        <button type="button" class="myButton btn btn-default" data-button-index="4">light</button>
      </div>
      <div class="col-md-1">
        <button type="button" class="myButton btn btn-default" data-button-index="5">light</button>
      </div>
      <div class="col-md-1">
        <button type="button" class="myButton btn btn-default" data-button-index="6">light</button>
      </div>
      <div class="col-md-1">
        <button type="button" class="myButton btn btn-default" data-button-index="7">light</button>
      </div>
      <div class="col-md-1">
        <button type="button" class="myButton btn btn-default" data-button-index="8">light</button>
      </div>
      <div class="col-md-1"></div>
      <div class="col-md-1"></div>
    </div>

  </body>
</html>

执行：　

创建虚拟端口COM2和COM3，串口调试助手打开COM3，设置波特率115200

执行node 命令：node server

访问页面：http://localhost:3000/bs/index.html

结果：

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原文地址：https://www.cnblogs.com/wangxuehao/p/6945604.html