node.js - Arduino 串口和 socket

Question

我正在尝试使用 Node.js 和 Socket.io 以及我的代码将串行数据发送到 Arduino。

而html页面只有一个按钮。它的工作 Node 和html端。但这不是发送串行数据。

var express = require('express');
var app = express();
var server = require('http').createServer(app);
var io = require('socket.io')(server);
 var port = process.env.PORT || 3000;


 server.listen(port, function () {
//  console.log('Server listening at port %d', port);
});

 // Routing

 app.use(express.static(__dirname + '/public'));

var SerialPort = require("serialport").SerialPort
var serialPort = new SerialPort("/dev/ttyACM3", {
baudrate:9600
}, false); // this is the openImmediately flag [default is true]



io.on('connection', function (socket) {

    socket.on('my other event', function (data) {
        console.log(data);

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

        serialPort.write(data, function (err, results) {
            console.log('err ' + err);
            console.log('results ' + results);
        });
    });

  });
  });

 app.get('/', function (req, res) {
 res.sendfile(__dirname + '/index.html');
});

Answer 1

向 Arduino 发送串行消息并不像简单地传递一个字符串那么简单。不幸的是，您必须逐个字符发送字符串，Arduino 将接收该字符串并将其连接回字符串。发送最后一个字符后，您需要发送最后一个换行符 (/n)，这是 Arduino 停止连接并评估消息的信号。

这是您需要在 Node.js 服务器中执行的操作:

// Socket.IO message from the browser
socket.on('serialEvent', function (data) {

    // The message received as a String
    console.log(data);

    // Sending String character by character
    for(var i=0; i<data.length; i++){
        myPort.write(new Buffer(data[i], 'ascii'), function(err, results) {
            // console.log('Error: ' + err);
            // console.log('Results ' + results);
        });
    }

    // Sending the terminate character
    myPort.write(new Buffer('\n', 'ascii'), function(err, results) {
        // console.log('err ' + err);
        // console.log('results ' + results);
    });
});

这是接收此信息的 Arduino 代码:

String inData = "";

void loop(){
    while (Serial.available() > 0) {
        char received = Serial.read();
        inData.concat(received);

        // Process message when new line character is received
        if (received == '\n') {
            // Message is ready in inDate
        }
    }
}