Dal mio nuovo server su Arduino (che lascerò attivo qualche giorno), non solo puoi vedere lo stato delle mie luci e la temperatura di camera mia, ma puoi anche comandare tre pin che per ora sono collegati a tre led colorati, ma che domani potrei associare tramite relè a qualsiasi apparecchio elettrico.
Tutto questo grazie alla libreria WebServer.h, che aggiunge funzionalità molto interessati e facili da programmare anche per un ignorante come me (che si diverte come un bambino).
Come sempre, critiche consigli e suggerimenti sono bene accetti.
Come sempre, il codice è dopo il salto.
/* Web_Demo.pde -- sample code for Webduino server library */
/*
* To use this demo, enter one of the following USLs into your browser.
* Replace "host" with the IP address assigned to the Arduino.
*
* http://host/
* http://host/json
*
* This URL brings up a display of the values READ on digital pins 0-9
* and analog pins 0-5. This is done with a call to defaultCmd.
*
*
* http://host/form
*
* This URL also brings up a display of the values READ on digital pins 0-9
* and analog pins 0-5. But it's done as a form, by the "formCmd" function,
* and the digital pins are shown as radio buttons you can change.
* When you click the "Submit" button, it does a POST that sets the
* digital pins, re-reads them, and re-displays the form.
*
*/
#include "SPI.h"
#include "Ethernet.h"
#include "WebServer.h"
int lPin = 1; // Light sensor pin
int tPin = 3; // Temperature sensor pin
int luce = 0; // light in Lux
float temp = 0.0; // Temperature in C°
String lstatus;
// no-cost stream operator as described at
// http://sundial.org/arduino/?page_id=119
template<class T>
inline Print &operator <<(Print &obj, T arg)
{ obj.print(arg); return obj; }
// CHANGE THIS TO YOUR OWN UNIQUE VALUE
static uint8_t mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
// CHANGE THIS TO MATCH YOUR HOST NETWORK
static uint8_t ip[] = { 192, 168, XXX, XXX };
#define PREFIX ""
WebServer webserver(PREFIX, 80);
// commands are functions that get called by the webserver framework
// they can read any posted data from client, and they output to server
void jsonCmd(WebServer &server, WebServer::ConnectionType type, char *url_tail, bool tail_complete)
{
if (type == WebServer::POST)
{
server.httpFail();
return;
}
//server.httpSuccess(false, "application/json");
server.httpSuccess("application/json");
if (type == WebServer::HEAD)
return;
int i;
server << "{ ";
for (i = 0; i <= 9; ++i)
{
// ignore the pins we use to talk to the Ethernet chip
int val = digitalRead(i);
server << "\"d" << i << "\": " << val << ", ";
}
for (i = 0; i <= 5; ++i)
{
int val = analogRead(i);
server << "\"a" << i << "\": " << val;
if (i != 5)
server << ", ";
}
server << " }";
}
void outputPins(WebServer &server, WebServer::ConnectionType type, bool addControls = false)
{
P(htmlHead) =
"<html>"
"<head>"
"<title>Arduinogaspar Web Server</title>"
"<style type=\"text/css\">"
"BODY { font-family: sans-serif }"
"H1 { font-size: 14pt; text-decoration: underline }"
"P { font-size: 10pt; }"
"</style>"
"</head>"
"<body>"
"<p>Digital Pin 5: green light<br>"
"Digital Pin 4: yellow light<br>"
"Digital Pin 3: red light<br>"
"Values can be changed from the /form page<br>"
"and can be exported from the /json page.<br>"
"</p>";
int i;
server.httpSuccess();
server.printP(htmlHead);
if (addControls)
server << "<form action='" PREFIX "/form' method='post'>";
server << "<h1>Digital Pins</h1><p>";
for (i = 0; i <= 9; ++i)
{
// ignore the pins we use to talk to the Ethernet chip
int val = digitalRead(i);
server << "Digital " << i << ": ";
if (addControls)
{
char pinName[4];
pinName[0] = 'd';
itoa(i, pinName + 1, 10);
server.radioButton(pinName, "1", "On", val);
server << " ";
server.radioButton(pinName, "0", "Off", !val);
}
else
server << (val ? "HIGH" : "LOW");
server << "<br/>";
}
server << "</p><h1>Analog Pins</h1><p>";
for (i = 0; i <= 5; ++i)
{
int val = analogRead(i);
server << "Analog " << i << ": " << val << "<br/>";
}
server << "</p>";
server << "Temperature:" << temp << "°C<br/>";
server << "Light is " << lstatus << "</p>";
if (addControls)
server << "<input type='submit' value='Submit'/></form>";
server << "</body></html>";
}
void formCmd(WebServer &server, WebServer::ConnectionType type, char *url_tail, bool tail_complete)
{
if (type == WebServer::POST)
{
bool repeat;
char name[16], value[16];
do
{
repeat = server.readPOSTparam(name, 16, value, 16);
if (name[0] == 'd')
{
int pin = strtoul(name + 1, NULL, 10);
int val = strtoul(value, NULL, 10);
digitalWrite(pin, val);
}
} while (repeat);
server.httpSeeOther(PREFIX "/form");
}
else
outputPins(server, type, true);
}
void defaultCmd(WebServer &server, WebServer::ConnectionType type, char *url_tail, bool tail_complete)
{
outputPins(server, type, false);
}
void setup()
{
// set pins 0-8 for digital input
for (int i = 0; i <= 9; ++i)
pinMode(i, INPUT);
pinMode(9, OUTPUT);
Ethernet.begin(mac, ip);
webserver.begin();
webserver.setDefaultCommand(&defaultCmd);
webserver.addCommand("json", &jsonCmd);
webserver.addCommand("form", &formCmd);
}
void loop()
{
temp = ( 5.0 * analogRead(tPin) * 100.0) / 1024.0; // Conversione voltaggio sensore in temperatura
luce = (analogRead(lPin) * 10000.0) / 1024.0; //Conversione voltaggio sensore in Lux
if (luce < 201) {
lstatus = "OFF";
}
else {
lstatus = "ON";
}
// process incoming connections one at a time forever
webserver.processConnection();
// if you wanted to do other work based on a connecton, it would go here
}
