Node.js扩展读取发到上位机Raspberry pi的串口温度数据

jackxiang 2013-2-24 09:52

画图Html5包：http://www.rgraph.net/docs/updating-charts-dynamically.html
if (document.all && RGraph.isIE8()) {
alert('[MSIE] Sorry, Internet Explorer 8 is not fast enough to support animated charts');
}

注意：不支持IE8，经测试FF,Chrome都支持。
sudo apt-get install nodejs npm //npm 才能安装nodejs的扩展
sudo npm install serialport

"use strict";
//2012-06-23 http://alexandre.alapetite.fr

var arduinoSerialPort = '/dev/ttyACM0';  //Serial port over USB connection between the Raspberry Pi and the Arduino

var fs = require('fs');
function writeFile(text)
{
  fs.writeFile('temperature.json', text, function(err)
  {
    if (err) console.warn(err);
  });
}

var os = require('os');
var serverSignature = 'Node.js / Debian ' + os.type() + ' ' + os.release() + ' ' + os.arch() + ' / Raspberry Pi B + Arduino Uno R3';

var postOptions =
{
  host: 'alexandre.alapetite.fr',  //Change to your own server  posttestserver.com
  path: '/doc-alex/temperature/post.php',  //  /post.php
  method: 'POST',
  headers:
  {
    'Content-Type': 'application/x-www-form-urlencoded',
    'Connection': 'close',
    'User-Agent': serverSignature
  }
};

var http = require('http');
function postData(s)
{//Standard HTTP POST request
  var myOptions = postOptions;
  postOptions.headers['Content-Length'] = s.length;

var requestPost = http.request(myOptions, function(res)
  {
    res.setEncoding('utf8');
    /*res.on('data', function (chunk)
    {
      console.log(chunk);
    });*/
  });

requestPost.on('error', function(e)
  {
    console.warn(e);
  });

requestPost.write(s);
  requestPost.end();
}

var serialport = require('serialport');
var serialPort = new serialport.SerialPort(arduinoSerialPort,
{//Listening on the serial port for data coming from Arduino over USB
  parser: serialport.parsers.readline('\n')
});

var lastTemperatureIndoor = NaN;
var lastTemperatureOutoor = NaN;
var dateLastInfo = new Date(0);

function colourScale(t)
{//Generate an HTML colour in function of the temperature
  if (t <= -25.5) return '0,0,255';
  if (t <= 0) return Math.round(255 + (t * 10)) + ',' + Math.round(255 + (t * 10)) + ',255';
  if (t <= 12.75) return Math.round(255 - (t * 20)) + ',255,' + Math.round(255 - (t * 20));
  if (t <= 25.5) return Math.round((t - 12.75) * 20) + ',255,0';
  if (t <= 38.25) return '255,' + Math.round(255 - (t - 25.5) * 20) + ',0';
  return '255,0,0';
}

module.exports.temperatureResponse = temperatureResponse;

来自：http://alexandre.alapetite.fr/doc-alex/raspberrypi-nodejs-arduino/index.en.html

最后编辑： jackxiang 编辑于2013-2-25 22:36

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Node.js扩展读取发到上位机Raspberry pi的串口温度数据

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Node.js扩展读取发到上位机Raspberry pi的串口温度数据

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最新日志

链接

向东博客专注WEB应用构架之美 --- 构架之美，在于尽态极妍 | 应用之美，在于药到病除|赢在IT，Playin' with IT,Focus on Killer Application,Marketing Meets Technology.