如何利用Arduino+Nodejs做一个手势识别的交互系统

本篇文章为大家展示了如何利用Arduino+Nodejs做一个手势识别的交互系统，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。

接触Arduino也有些日子了，就想着做一个小玩意儿检验一下哈。不恰当的地方欢迎交流一下。。。

本次接到命令要做一个智能手势识别交互的系统产品。主要用到的硬件模块有SeeedStudio也就是矽递科技公司开发一款Arduino Uno开发板图1、一款PAJ传感器图2。软件方面就主要是Arduino IDE和Nodejs架设的Web服务器。目标产品的预想是通过手势动作控制Web界面的滚动与切换。

图1：

图2：

介绍完所需材料模块，那就开始进行积木搭建咯。。

因为模块比较少，就省去了扩展板

下面是Arduino IDE程序：

代码在这里：

//调用两个库函数#include #include "paj7620.h"#define GES_REACTION_TIME    800#define GES_QUIT_TIME     1000//定义一个LED输出引脚，用来进行握手测试const int ledPin = 13;//定义一个初始状态字符String ledStatus = "off";// 用来从Nodejs客户端获取信息String inputString = "";boolean stringComplete = false;/** * * arduino board setup * */void setup(){    // 设置波特率  Serial.begin(115200);//定义LED引脚  pinMode(ledPin, OUTPUT);  //PAJ  uint8_t error = 0;  Serial.println("\nPAJ7620U2 TEST DEMO: Recognize 15 gestures.");  error = paj7620Init();      // initialize Paj7620 registers  if (error)   {    Serial.print("INIT ERROR,CODE:");    Serial.println(error);  }  else  {    Serial.println("INIT OK");  }  Serial.println("Please input your gestures:");}/** * * Default arduino loop function * it runs over and over again * */void loop(){  uint8_t data = 0, data1 = 0, error;   error = paj7620ReadReg(0x43, 1, &data);       // Read Bank_0_Reg_0x43/0x44 for gesture result.  if (!error)   {    switch (data)                       {      case GES_RIGHT_FLAG:        delay(GES_REACTION_TIME);        paj7620ReadReg(0x43, 1, &data);        if(data == GES_LEFT_FLAG)         {          Serial.println("
");          Serial.println("
");        }        else if(data == GES_FORWARD_FLAG)         {          Serial.println("
");          Serial.println("
");          delay(GES_QUIT_TIME);        }        else if(data == GES_BACKWARD_FLAG)         {          Serial.println("
");          Serial.println("
");          delay(GES_QUIT_TIME);        }        else        {          Serial.println("
");          Serial.println("
");        }                  break;      case GES_LEFT_FLAG:        delay(GES_REACTION_TIME);        paj7620ReadReg(0x43, 1, &data);        if(data == GES_RIGHT_FLAG)         {          Serial.println("
");          Serial.println("
");        }        else if(data == GES_FORWARD_FLAG)         {          Serial.println("
");          Serial.println("
");          delay(GES_QUIT_TIME);        }        else if(data == GES_BACKWARD_FLAG)         {          Serial.println("
");          Serial.println("
");          delay(GES_QUIT_TIME);        }        else        {          Serial.println("
");          Serial.println("
");        }                  break;        break;      case GES_UP_FLAG:        delay(GES_REACTION_TIME);        paj7620ReadReg(0x43, 1, &data);        if(data == GES_DOWN_FLAG)         {          Serial.println("
");          Serial.println("
");        }        else if(data == GES_FORWARD_FLAG)         {          Serial.println("
");          Serial.println("
");          delay(GES_QUIT_TIME);        }        else if(data == GES_BACKWARD_FLAG)         {          Serial.println("
");          Serial.println("
");          delay(GES_QUIT_TIME);        }        else        {          Serial.println("
");          Serial.println("
");        }        break;      case GES_DOWN_FLAG:        delay(GES_REACTION_TIME);        paj7620ReadReg(0x43, 1, &data);        if(data == GES_UP_FLAG)         {          Serial.println("
");          Serial.println("
");        }        else if(data == GES_FORWARD_FLAG)         {          Serial.println("
");          Serial.println("
");          delay(GES_QUIT_TIME);        }        else if(data == GES_BACKWARD_FLAG)         {          Serial.println("
");          Serial.println("
");          delay(GES_QUIT_TIME);        }        else        {          Serial.println("
");          Serial.println("
");        }        break;      case GES_FORWARD_FLAG:        delay(GES_REACTION_TIME);        paj7620ReadReg(0x43, 1, &data);        if(data == GES_BACKWARD_FLAG)         {          Serial.println("
");          Serial.println("
");          delay(GES_QUIT_TIME);        }        else        {          Serial.println("
");          Serial.println("
");          delay(GES_QUIT_TIME);        }        break;      case GES_BACKWARD_FLAG:             delay(GES_REACTION_TIME);        paj7620ReadReg(0x43, 1, &data);        if(data == GES_FORWARD_FLAG)         {          Serial.println("
");          Serial.println("
");          delay(GES_QUIT_TIME);        }        else        {          Serial.println("
");          Serial.println("
");          delay(GES_QUIT_TIME);        }        break;      case GES_CLOCKWISE_FLAG:        Serial.println("
");          Serial.println("
");        break;      case GES_COUNT_CLOCKWISE_FLAG:        Serial.println("
");          Serial.println("
");        break;        default:        paj7620ReadReg(0x44, 1, &data1);        if (data1 == GES_WAVE_FLAG)         {          Serial.println("
");          Serial.println("
");        }        break;    }  }  delay(100);    updateLedStatus();}void updateLedStatus() { //检测LED状态是否被完整接收  if (stringComplete) {        if (inputString == "on\r") {      ledStatus = "on";    }    if (inputString == "off\r") {      ledStatus = "off";    }    //把LED状态发送到服务器    Serial.println(ledStatus);        inputString = "";    stringComplete = false;  }  // 通过当时状态判断行为动作状态  digitalWrite(ledPin, ledStatus == "on" ? HIGH : LOW);} void serialEvent() {  while (Serial.available()) {    // 接收新字节    char inChar = (char)Serial.read();        inputString += inChar;    // 如果接收到换行符则中断    if (inChar == '\r') {      stringComplete = true;    }  }}

接着是Web服务器的搭建，使用的是Nodejs。

其中server.js文件：

var app = require('http').createServer(handler),  io = require('socket.io').listen(app),  fs = require('fs'),  url = require('url'),  SerialPort = require('serialport').SerialPort,  // initialize serialport using the COM5 serial port  // remember to change this string if your arduino is using a different serial port  sp = new SerialPort('COM5', {    baudRate: 115200  }),  // this var will contain the message string dispatched by arduino  arduinoMessage = '',  /**   * helper function to load any app file required by client.html   * @param  { String } pathname: path of the file requested to the nodejs server   * @param  { Object } res: http://nodejs.org/api/http.html#http_class_http_serverresponse   */  readFile = function(pathname, res) {    // an empty path returns client.html    if (pathname === '/')      pathname = 'client.html';    fs.readFile('htmlarduino/client/' + pathname, function(err, data) {      if (err) {        console.log(err);        res.writeHead(500);        return res.end('Error loading client.html');      }      res.writeHead(200);      res.end(data);    });  },  /**   *   * This function is used as proxy to print the arduino messages into the nodejs console and on the page   * @param  { Buffer } buffer: buffer data sent via serialport   * @param  { Object } socket: it's the socket.io instance managing the connections with the client.html page   *   */  sendMessage = function(buffer, socket) {    // concatenating the string buffers sent via usb port    arduinoMessage += buffer.toString();    // detecting the end of the string    if (arduinoMessage.indexOf('\r') >= 0) {      // log the message into the terminal      // console.log(arduinoMessage);      // send the message to the client      socket.volatile.emit('notification', arduinoMessage);      // reset the output string to an empty value      arduinoMessage = '';    }  };// creating a new websocketio.sockets.on('connection', function(socket) {  // listen all the serial port messages sent from arduino and passing them to the proxy function sendMessage  sp.on('data', function(data) {    sendMessage(data, socket);  });  // listen all the websocket "lightStatus" messages coming from the client.html page  socket.on('lightStatus', function(lightStatus) {    sp.write(lightStatus + '\r', function() {      // log the light status into the terminal      console.log('the light should be: ' + lightStatus);    });  });});// just some debug listenerssp.on('close', function(err) {  console.log('Port closed!');});sp.on('error', function(err) {  console.error('error', err);});sp.on('open', function() {  console.log('Port opened!');});// L3T'S R0CK!!!// creating the server ( localhost:8000 )app.listen(8000);// server handlerfunction handler(req, res) {  readFile(url.parse(req.url).pathname, res);}

其中还有用到Nodejs的socket.io模块进行前后台数据调用。serialport模块进行跟Arduino串口匹配通信。通过npm命令就可以安装

Web页面就比较简单了：

                    Turn the light        on                        

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