我目前正在使用我的 homewatch server 端口从 Arduino Unow 以太网库到带有 Ethercard 库（或 UIPEthernet）的 AVR-NETIO。
在服务器端有一个 Apache/PHP/MySQL 服务器。
要更新网络服务器连接数据库上的数据，您可以使用 POST 或 GET 请求到 php 网页。然后可以轻松地将这些数据添加到数据库中，并且相同或另一个网页也可以显示数据库的数据。
<?php
require 'dbhelp.php';
//header('Content-type: text/plain');
echo "<html>";
echo "<head>";
echo "<meta name='viewport' content='width=device-width, user-scalable=false, initial-scale=1;'>";
echo "</head>";
echo "<body>" . "<h2>Temperatur und Luftfeuchte</h2>";
// GET requests are sent as a query string on the URL:
// GET index.html?name1=value&name2=value HTTP/1.1
// Host: about.com
// http://192.168.0.40/homewatch/index.php?channel=1&temp=165&humidity=80&datetime=010120131234
if($DEBUG){
print("<pre>");
print_r($_GET);
print("</pre>");
}
openDB();
if( isset($_GET['channel']) && isset($_GET['temp']) && isset($_GET['humidity']) )
{
if($DEBUG)
echo "<p>addData()";
$c=$_GET['channel'];
$t=$_GET['temp'];
$h=$_GET['humidity'];
addData($c, $t, $h);
if($DEBUG)
echo "<p>all done";
//listData();
echo "<p>OK updated data for channel:" . $c . "</p>";
}
else
{
if($DEBUG)
echo "listData()";
//listData();
//echo "<p>missing arg";
}
echo "<p><a href='linechart_hour.php'>Stunden-Übersicht</a></p>";
echo "<p><a href='barchart_days.php'>Tages-Übersicht</a></p>";
echo "<p><a href='http://www.unwetterzentrale.de/uwz/getwarning_de.php?plz=41363&uwz=UWZ-DE&lang=de'>Unwetterwarnungen Jüchen</a></p>";
echo showAllCharts();
//#################################################################################
// see http://code.google.com/p/googlechartphplib/wiki/GettingStarted
//#################################################################################
// don't forget to update the path here
require './lib/GoogleChart.php';
$chart = new GoogleChart('lc', 500, 200);
// manually forcing the scale to [0,100]
$chart->setScale(0,100);
// add one line
$data = new GoogleChartData(array(49,74,78,71,40,39,35,20,50,61,45));
$chart->addData($data);
// customize y axis
$y_axis = new GoogleChartAxis('y');
$y_axis->setDrawTickMarks(false)->setLabels(array(0,50,100));
$chart->addAxis($y_axis);
// customize x axis
$x_axis = new GoogleChartAxis('x');
$x_axis->setTickMarks(5);
$chart->addAxis($x_axis);
echo $chart->toHtml();
//#################################################################################
// END
//#################################################################################
echo "<p>v0.9" . "</body>" . "</html>";
?>
dbhelp.php 文件如果不存在则自动创建数据库：
<?php
//global dbhelp.php file
$server="localhost";
$user="root";
$passwd="password";
$names=array(
1 => "Aussen",
2 => "Schlaf",
3 => "Andreas");
$DEBUG=false;
function openDB(){
global $DEBUG;
global $user;
global $passwd;
$link = mysql_connect("localhost", $user, $passwd);
if(!$link){
echo "SqlConnect failed";
echo mysql_error();
}
else
if($DEBUG)
echo "SqlConnect OK";
$query="CREATE database IF NOT EXISTS avrdb;";
$result = mysql_query($query, $link);
if(!$result){
echo "CreateDB failed";
echo mysql_error();
}
else
if($DEBUG)
echo "CreateDB OK";
$result = mysql_select_db("avrdb", $link);
if(!$result){
echo "SelectDB failed";
echo mysql_error();
}
else
if($DEBUG)
echo "SelectDB OK";
$query="CREATE TABLE IF NOT EXISTS `avrtemp` (" .
"`id` int(11) NOT NULL AUTO_INCREMENT, " .
"`channel` int(11), " .
"`temp` int(11), " .
"`humidity` int(11), " .
"`date_time` TIMESTAMP, " .
"PRIMARY KEY (`id`) );";
$result = mysql_query($query, $link);
if(!$result){
echo "CreateTable failed";
echo mysql_error();
}
else
if($DEBUG)
echo "CreateTable OK";
return true;
}
...
function addData($c,$t,$h){
global $DEBUG;
$lastStoredDateTime=getLastStoredDateTime();
if($DEBUG){
echo "<p>" . $c . "</p>\n";
echo "<p>LastDateTime=".$lastStoredDateTime."</p>\n";
}
// add data but do not save seconds (use 00)
$query="INSERT INTO avrtemp (`channel`,`temp`,`humidity`,`date_time`)".
" VALUES ( $c,$t,$h,".
// " DATE_FORMAT(NOW()),".
" DATE_FORMAT('".$lastStoredDateTime."', ".
" '%Y-%c-%d %H:%i') )";
if($DEBUG)
echo "<p>" . $query;
$result = mysql_query($query);
if(!$result){
echo "addData failed";
echo mysql_error();
}
else
if($DEBUG)
echo "addData OK";
}
Arduino 发布（使用 GET）每 5 分钟更新一次数据。数据每分钟左右通过 433MHz 无线传感器到达 Arduino。
使用以太网库完成数据更新
char cBuf[maxBuf+1];
const char getHttpString[] =
"GET /homewatch/index.php?channel=%i&temp=%i&humidity=%i&time=%i\0";
...
// and send data: /index.php?channel=1&temp=165&humidity=80&datetime=010120131234
if (client.connect(server, 80)) {
Serial.println("connected. Send GET...");
snprintf(cBuf, maxBuf,
getHttpString,
sensorData[idxChannel].channel,
sensorData[idxChannel].temp,
sensorData[idxChannel].humidity,
sensorData[idxChannel].time_long
);
Serial.println(F("####"));
Serial.println(cBuf);
Serial.println(F("####"));
client.println(cBuf);
...
https://github.com/hjgode/homewatch/blob/master/arduino/SketchBook/WebClientTemperature/WebClientTemperature.ino:
字符串“GET /homewatch/index.php?channel=%i&temp=%i&humidity=%i&time=%i\0”只是填充了实际的传感器数据，服务器将其保存到其数据库中。
Ethercard 库带有类似的示例：请参阅示例 noipClient、pachube 和 webclient。不幸的是，我还不能将这些用于我的 AVR-NETIO。
将一些数据发布（GET）到我当前工作的服务器的代码是
void sendData(int idxChannel){
Serial.print(F("in sendData for idx=")); Serial.println(idxChannel);
byte sd;
int channel=sensorData[idxChannel].channel;
int temp=sensorData[idxChannel].temp;
int humidity=sensorData[idxChannel].humidity;
char* stime="201301011122";
stime=printDateTime((char*)&stime, 13, sensorData[idxChannel].time_long);
if(sensorData[idxChannel].bUpdated==0){
//nothing new
if (MYDEBUG==0){
Serial.println(F("leaving for not updated channel data"));
goto exit_sendData;
}
else
{
sensorData[idxChannel].channel=idxChannel;
sensorData[idxChannel].temp=222;
sensorData[idxChannel].humidity=55;
sensorData[idxChannel].time_long=now();
}
}
// generate two fake values as payload - by using a separate stash,
// we can determine the size of the generated message ahead of time
sd = stash.create();
stash.print("0,");
stash.println((word) millis() / 123);
stash.print("1,");
stash.println((word) micros() / 456);
stash.save();
// generate the header with payload - note that the stash size is used,
// and that a "stash descriptor" is passed in as argument using "$H"
Stash::prepare(PSTR("GET http://$F/homewatch/index.php?channel=$D&temp=$D&humidity=$D&time=$S" "\r\n"
"Host: $F" "\r\n"
"Content-Length: $D" "\r\n"
"\r\n"
"$H"),
website,
channel,
temp,
humidity,
stime,
website, stash.size(), sd);
// send the packet - this also releases all stash buffers once done
ether.tcpSend();
exit_sendData:
lastConnectionTime = now();//millis();
Serial.println(F("...end of sendData()"));
}
如你所见，有一个格式化字符串
PSTR("GET http://$F/homewatch/index.php?channel=$D&temp=$D&humidity=$D&time=$S"
里面充满了变量。 $F 从闪存中填充，$D 是数字变量，$S 从 RAM 内存字符串中填充。在没有我的 SensorCode（使用中断）的情况下使用它是有效的。