Salve a tutti,
è la prima volta che scrivo su questo forum. Sto, in questi giorni, dilettandomi con i PIR su Arduino per fare un allarme con sensori di movimento. I sensori li ho collegati su un Arduino Uno e via RF400Mhz inviano lo stato (1/0) ad un Arduino Mega sul quale è collegato un Ethernet Shield con una pagina web accessibile. Il problema è il seguente:
Ho scritto il codice su Arduino Mega per la ricezione dello stato dei sensori (1 o 0) e funziona, il problema è che non riesco a far visualizzare lo stato di ENTRAMBI i sensori sulla pagina web, ma me ne visualizza uno solo. Vi allego il codice prima di Arduino Mega e poi della pagina web sperando che qualcuno di voi mi possa dare una mano. Molte grazie a chiunque mi aiuti, cordiali saluti! Daniele 
/* CODICE ARDUINO MEGA*/
//*** WIRING SECTION *** //
//DATA DEL RX SU PIN 3
//*** Inclusione Librerie *** //
#include <VirtualWire.h>
#include <SPI.h>
#include <Ethernet.h>
#include <SD.h>
// *** Dichiarazione variabili e costanti *** //
byte message[VW_MAX_MESSAGE_LEN]; // a buffer to store the incoming messages
byte messageLength = VW_MAX_MESSAGE_LEN; // the size of the message
//#define cicalino A0
#define REQ_BUF_SZ 100
char HTTP_req[REQ_BUF_SZ] = {0}; // buffered HTTP request stored as null terminated string
char req_index = 0; // index into HTTP_req buffer
// **** IMPOSTAZIONI ETHERNET ****
byte mac[] = { 0x00,0xAA,0xBB,0xCC,0xDE,0x02 };
byte subnet[] = { 255, 255, 255, 0 };
byte gateway[] = { 192, 168, 50, 1 };
IPAddress ip( 192,168,50,106 ); // IP address, may need to change depending on network
EthernetServer server(80); // create a server at port 80
File webFile;
void setup()
{
// disable Ethernet chip
pinMode(10, OUTPUT);
digitalWrite(10, HIGH);
Ethernet.begin(mac, ip, subnet, gateway);
Serial.begin(9600);
server.begin();
Serial.println("Initializing SD card...");
if (!SD.begin(4)) {
Serial.println("ERROR - SD card initialization failed!");
return; // init failed
}
Serial.println("SUCCESS - SD card initialized.");
// check for index.html file
if (!SD.exists("index.htm")) {
Serial.println("ERROR - Can't find index.htm file!");
return; // can't find index file
}
Serial.println("SUCCESS - Found index.htm file.");
//pinMode(cicalino, OUTPUT);
vw_set_rx_pin(3);
Serial.println("Dispositivo Pronto");
// Initialize the IO and ISR
vw_setup(4000); // Bits per sec
vw_rx_start(); // Start the receiver
}
void loop()
{
EthernetClient client = server.available(); // try to get client
if (client) { // got client?
boolean currentLineIsBlank = true;
while (client.connected()) {
if (client.available()) { // client data available to read
char c = client.read(); // read 1 byte (character) from client
// buffer first part of HTTP request in HTTP_req array (string)
// leave last element in array as 0 to null terminate string (REQ_BUF_SZ - 1)
if (req_index < (REQ_BUF_SZ - 1)) {
HTTP_req[req_index] = c; // save HTTP request character
req_index++;
}
// last line of client request is blank and ends with \n
// respond to client only after last line received
if (c == '\n' && currentLineIsBlank) {
// send a standard http response header
client.println("HTTP/1.1 200 OK");
// remainder of header follows below, depending on if
// web page or XML page is requested
// Ajax request - send XML file
if (StrContains(HTTP_req, "ajax_inputs")) {
// send rest of HTTP header
client.println("Content-Type: text/xml");
client.println("Connection: keep-alive");
client.println();
// send XML file containing input states
XML_response(client);
}
else { // web page request
// send rest of HTTP header
client.println("Content-Type: text/html");
client.println("Connection: keep-alive");
client.println();
// send web page
webFile = SD.open("index.htm"); // open web page file
if (webFile) {
while(webFile.available()) {
client.write(webFile.read()); // send web page to client
}
webFile.close();
}
}
// display received HTTP request on serial port
Serial.print(HTTP_req);
// reset buffer index and all buffer elements to 0
req_index = 0;
StrClear(HTTP_req, REQ_BUF_SZ);
break;
}
// every line of text received from the client ends with \r\n
if (c == '\n') {
// last character on line of received text
// starting new line with next character read
currentLineIsBlank = true;
}
else if (c != '\r') {
// a text character was received from client
currentLineIsBlank = false;
}
} // end if (client.available())
} // end while (client.connected())
delay(1); // give the web browser time to receive the data
client.stop(); // close the connection
} // end if (client)
}
// send the XML file with switch statuses and analog value
void XML_response(EthernetClient cl){
uint8_t buf[VW_MAX_MESSAGE_LEN];
uint8_t buflen = VW_MAX_MESSAGE_LEN;
if (vw_get_message(buf, &buflen)) {
cl.print("<?xml version = \"1.0\" ?>");
cl.print("<inputs>");
cl.print("<pir1>");
if (buf[0]=='1') {
Serial.println("ALLARME RICEVUTO DA PIR 1");
cl.print("In Allarme 1");
}
else if(buf[0]=='2') {
Serial.println("PIR 1 TUTTO OK");
cl.print("Non in Allarme");
}
cl.print("</pir1>");
cl.print("<pir3>");
if (buf[0]=='3') {
Serial.println("ALLARME RICEVUTO DA PIR 3");
cl.print("In Allarme 3");
}
else if(buf[0]=='4') {
Serial.println("PIR 3 TUTTO OK");
cl.print("Non in Allarme");
}
cl.print("</pir3>");
cl.print("</inputs>");
}
}
// sets every element of str to 0 (clears array)
void StrClear(char *str, char length)
{
for (int i = 0; i < length; i++) {
str[i] = 0;
}
}
// searches for the string sfind in the string str
// returns 1 if string found
// returns 0 if string not found
char StrContains(char *str, char *sfind)
{
char found = 0;
char index = 0;
char len;
len = strlen(str);
if (strlen(sfind) > len) {
return 0;
}
while (index < len) {
if (str[index] == sfind[found]) {
found++;
if (strlen(sfind) == found) {
return 1;
}
}
else {
found = 0;
}
index++;
}
return 0;
}