使用Node.Js读取多个串行输入

时间:2016-04-01 18:26:34

标签: node.js

我一直在研究一个简单的脚本来监控我实验室中的6个arduino单元。我好像差不多了!

我目前的问题是将每个数据集很好地捆绑在一个字符串中。实际上,我可以打开与所有串口的连接,在他们发出数据时接收他们的数据,但缺少将其组织到捆绑中的代码块。我曾考虑过尝试创建一个临时数组来附加块或生成子进程。但是,我遇到了子进程的困难,并且不确定如何以适当的方式构造数组。一旦我有一个捆绑的字符串,我将发送到我的服务器上的数据库。我确实有这种感觉,我可能会以一种不合适的方式做到这一点,任何和所有的建议都是非常苛刻的!

PS:您可能会注意到只有5个arduinos显示,这只是为了让事情变得不那么复杂,因为第6个arduino也显示为com9。

谢谢

守则

var serialport = require('serialport');
var SerialPort = serialport.SerialPort;

// list serial ports:
serialport.list(function (err, ports) {
    console.log(" Readout all availiable Com Ports and their pnpID:   ");
    ports.forEach(function(port) {

        console.log(port.comName);
        console.log(port.pnpId);
        console.log(port.manufacturer);

        var serialPort = new SerialPort(port.comName, {baudrate: 9600
        }, false);
        serialPort.open(function (error) {
        if ( error ) {
            console.log('failed to open: '+error);
        } else {
            console.log('open');
            serialPort.on('data', function(data) {
                console.log('data received: ' + port.comName+ '   ' + data);

                });
            }
        });
    })
})

输出

Readout all availiable Com Ports and their pnpID:   
COM11
USB\VID_2341&PID_0043\75430333437351517211
Arduino LLC (www.arduino.cc)
COM9
USB\VID_2341&PID_0043\7543033343735151C020
Arduino LLC (www.arduino.cc)
COM8
USB\VID_2341&PID_0043\754363434303516181F0
Arduino LLC (www.arduino.cc)
COM7
USB\VID_2341&PID_0043\7543033313735140B152
Arduino LLC (www.arduino.cc)
COM4
USB\VID_2341&PID_0043\754303334373515162D0
Arduino LLC (www.arduino.cc)
open
open
open
open
open
data received: COM8   L03 
data received: COM4   L01
data received: COM8   , -0.00127 , 8.19188

data received: COM4    , -
data received: COM7   L02
data received: COM4   0.00127 , 8.
data received: COM7    , -0.00
data received: COM4   19188

data received: COM7   127 , 8.
data received: COM9   L
data received: COM7   19188

3 个答案:

答案 0 :(得分:2)

从串口库的文档中 https://www.npmjs.com/package/serialport

在遇到新行之前,可以选择读取数据。可以使用它来代替baudRate来读取整行数据。

更改以下行

var serialPort = new serialport.SerialPort(port.comName, {
      baudrate: 9600
    }, false);

var serialPort = new serialport.SerialPort(port.comName, {
      parser: serialport.parsers.readline("\n")
    }, false);

然后在你的回调中,数据将以整行而不是分段

答案 1 :(得分:1)

编辑:

您应该创建一个处理服务器通信部分的收集器。只需将其放在名为collector.js的同一目录中的另一个文件中即可。然后主脚本会这样工作:

var serialport = require('serialport');
var collector = require('./collector');

// list serial ports:
serialport.list(function (err, ports) {
  console.log(" Readout all available Com Ports and their pnpID:   ");
  ports.forEach(function (port) {

    console.log(port.comName);
    console.log(port.pnpId);
    console.log(port.manufacturer);

    var serialPort = new serialport.SerialPort(port.comName, {
      baudrate: 9600
    }, false);

    serialPort.open(function (error) {
      if (error) {
        return console.log('failed to open: ' + error);
      }

      console.log('open');

      serialPort.on('data', function (data) {
        console.log('data received: ' + port.comName + '   ' + data);

        // add message to port message collection
        collector.add(port.comName, data);
      });
    });
  });
});

收藏家的工作方式如下:

var os = require('os');

var messages = {};

function checkAndSendData(key, data, message) {
  if (data === os.EOL || message.match(/^L\d\d , \d,\d\d\d\d\d , \d\.\d\d\d\d\d$/)) {
    // TODO: send data to server in formatted way, maybe need key?

    return true;
  }

  return false;
}

module.exports = {
  add: function(key, data) {
    if (typeof messages[key] === 'undefined') {
      messages[key] = '';
    }

    messages[key] += String(data);

    if (checkAndSendData(key, data, messages[key])) {
      messages[key] = '';
    }
  }
}

答案 2 :(得分:0)

这有点长的评论..

serialPort.on('data', function(data) {
  console.log('data received: ' + port.comName+ '   ' + data);
  // switch(JSON.parse(data).type) { // if that's a possibility  
  if ("BEGIN" === data) {
    console.log('begin data received: ' + port.comName+ '   ' + data);
  }
});

我认为您正在寻找的是一种复制模式(工厂,读者/作家?)但是,Begin,Stuff和End可能适合您?然后,您可以生成事件或致电您已传入的回调。

serialPort.on('data', function(data) {
  console.log('data received: ' + port.comName+ '   ' + data);
  // var _data =  JSON.parse(data); // if that's a possibility
  // switch(_data.type) { 
  //  case "BEGIN": fnBegin(port.comName, _data.object); break;
  // or  
  if ("BEGIN" === data) {
    console.log('begin data received: ' + port.comName+ '   ' + data);
  }
  // or
  factory.fn(port.comName, data);
});