利用Arduino+Nodejs做一个手势识别的交互系统【seeedstudio】

 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 <Wire.h>
#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("<section class=\"Right-Left\">");
          Serial.println("</section>");
        }
        else if(data == GES_FORWARD_FLAG) 
        {
          Serial.println("<section class=\"Forward\">");
          Serial.println("</section>");
          delay(GES_QUIT_TIME);
        }
        else if(data == GES_BACKWARD_FLAG) 
        {
          Serial.println("<section class=\"Backward\">");
          Serial.println("</section>");
          delay(GES_QUIT_TIME);
        }
        else
        {
          Serial.println("<section class=\"Right\">");
          Serial.println("</section>");
        }          
        break;
      case GES_LEFT_FLAG:
        delay(GES_REACTION_TIME);
        paj7620ReadReg(0x43, 1, &data);
        if(data == GES_RIGHT_FLAG) 
        {
          Serial.println("<section class=\"Left-Right\">");
          Serial.println("</section>");
        }
        else if(data == GES_FORWARD_FLAG) 
        {
          Serial.println("<section class=\"Forward\">");
          Serial.println("</section>");
          delay(GES_QUIT_TIME);
        }
        else if(data == GES_BACKWARD_FLAG) 
        {
          Serial.println("<section class=\"Backward\">");
          Serial.println("</section>");
          delay(GES_QUIT_TIME);
        }
        else
        {
          Serial.println("<section class=\"Left\">");
          Serial.println("</section>");
        }          
        break;
        break;
      case GES_UP_FLAG:
        delay(GES_REACTION_TIME);
        paj7620ReadReg(0x43, 1, &data);
        if(data == GES_DOWN_FLAG) 
        {
          Serial.println("<section class=\"Up-Down\">");
          Serial.println("</section>");
        }
        else if(data == GES_FORWARD_FLAG) 
        {
          Serial.println("<section class=\"Forward\">");
          Serial.println("</section>");
          delay(GES_QUIT_TIME);
        }
        else if(data == GES_BACKWARD_FLAG) 
        {
          Serial.println("<section class=\"Backward\">");
          Serial.println("</section>");
          delay(GES_QUIT_TIME);
        }
        else
        {
          Serial.println("<section class=\"Up\">");
          Serial.println("</section>");
        }
        break;
      case GES_DOWN_FLAG:
        delay(GES_REACTION_TIME);
        paj7620ReadReg(0x43, 1, &data);
        if(data == GES_UP_FLAG) 
        {
          Serial.println("<section class=\"Down-Up\">");
          Serial.println("</section>");
        }
        else if(data == GES_FORWARD_FLAG) 
        {
          Serial.println("<section class=\"Forward\">");
          Serial.println("</section>");
          delay(GES_QUIT_TIME);
        }
        else if(data == GES_BACKWARD_FLAG) 
        {
          Serial.println("<section class=\"Backward\">");
          Serial.println("</section>");
          delay(GES_QUIT_TIME);
        }
        else
        {
          Serial.println("<section class=\"Down\">");
          Serial.println("</section>");
        }
        break;
      case GES_FORWARD_FLAG:
        delay(GES_REACTION_TIME);
        paj7620ReadReg(0x43, 1, &data);
        if(data == GES_BACKWARD_FLAG) 
        {
          Serial.println("<section class=\"Forward-Backward\">");
          Serial.println("</section>");
          delay(GES_QUIT_TIME);
        }
        else
        {
          Serial.println("<section class=\"Forward\">");
          Serial.println("</section>");
          delay(GES_QUIT_TIME);
        }
        break;
      case GES_BACKWARD_FLAG:     
        delay(GES_REACTION_TIME);
        paj7620ReadReg(0x43, 1, &data);
        if(data == GES_FORWARD_FLAG) 
        {
          Serial.println("<section class=\"Backward-Forward\">");
          Serial.println("</section>");
          delay(GES_QUIT_TIME);
        }
        else
        {
          Serial.println("<section class=\"Backward\">");
          Serial.println("</section>");
          delay(GES_QUIT_TIME);
        }
        break;
      case GES_CLOCKWISE_FLAG:
        Serial.println("<section class=\"Clockwise\">");
          Serial.println("</section>");
        break;
      case GES_COUNT_CLOCKWISE_FLAG:
        Serial.println("<section class=\"anti-clockwise\">");
          Serial.println("</section>");
        break;  
      default:
        paj7620ReadReg(0x44, 1, &data1);
        if (data1 == GES_WAVE_FLAG) 
        {
          Serial.println("<section class=\"wave\">");
          Serial.println("</section>");
        }
        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 websocket
io.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 listeners
sp.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 handler
function 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:

<html>
<head>
    <title>手势识别控制Web</title>
    <style>
    center {
        font-size: 100px;
        font-family:arial;
		background:rgba(20,20,20,0.5);
		width:500px;
		margin:auto;
    }
	
	section{background:#333;margin:10px;width:100px;height:100px;}
    </style>
</head>
<body>
    <button>
        Turn the light
        <span>on</span>
    </button>
	
    <script src="socket.io/socket.io.js"></script>
    <script src="http://code.jquery.com/jquery-latest.min.js"></script>
    <script src="js/app.js"></script>
</body>
</html>

代码还有些粗糙,有待整理,有很多都是Arduino现成的示例库,只不过进行了适当的修改。这也就是Arduino流行的一个原因吧。

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