Hello,
I was tried control my air conditioning by a webserver using Ethernet Shield but I've been with problem relative the infrared (I think).
My webpage is saved in SD card together with data to control the air and used one physical button to trigger the option to turn on and to change the state in webpage I used AJAX (I know that isn't necessary to this case, but I'll the a lamp control)
The page with ajax is OK (fist part) and read the data in SD card and turn on AIR also (second part) but my problem is when I join parties.. When I include the library iRremote, the Ajax stop and I can't change the state of the button (stop all)
Any ideas why?
#include <SPI.h>
#include <Ethernet.h>
#include <SD.h>
#include <IRremote.h> // here the problem!!!
// size of buffer used to capture HTTP requests
#define REQ_BUF_SZ 40
// MAC address from Ethernet shield sticker under board
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress ip(192, 168, 0, 20); // IP address, may need to change depending on network
EthernetServer server(80); // create a server at port 80
File webFile;
File myFile;
//IRsend irsend;
char HTTP_req[REQ_BUF_SZ] = {0}; // buffered HTTP request stored as null terminated string
char req_index = 0; // index into HTTP_req buffer
void setup()
{
// disable Ethernet chip
pinMode(10, OUTPUT);
digitalWrite(10, HIGH);
Serial.begin(9600); // for debugging
// initialize SD card
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.htm file
if (!SD.exists("ajax.htm")) {
Serial.println("ERROR - Can't find ajax.htm file!");
return; // can't find index file
}
Serial.println("SUCCESS - Found ajax.htm file.");
pinMode(7, INPUT); // switch is attached to Arduino pin 3
Ethernet.begin(mac, ip); // initialize Ethernet device
server.begin(); // start to listen for clients
}
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");
client.println("Content-Type: text/html");
client.println("Connection: keep-alive");
client.println();
// Ajax request
if (StrContains(HTTP_req, "ajax_switch")) {
// read switch state and send appropriate paragraph text
GetSwitchState(client);
}
else { // web page request
// send web page
webFile = SD.open("ajax.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.println(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 state of the switch to the web browser
void GetSwitchState(EthernetClient cl)
{
if (digitalRead(7)) {
cl.println("Switch state: ON");
readSD();
}
else {
cl.println("Switch state: OFF");
}
}
// 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;
}
void readSD(){
int linha = 0;
unsigned long linhaEspec = 851 * linha;
Serial.println(linhaEspec);
myFile = SD.open("AR3.txt");
if(myFile){
myFile.seek(linhaEspec);
char caracter;
unsigned int aux[198];
String str = "";
int laco = 0;
for(int i=0; i <= 848; i++){
caracter = myFile.read();
if(caracter != ','){
str.concat(caracter);
}
else{
aux[laco] = str.toInt();
laco++;
str = "";
}
}
myFile.close();
//irsend.sendRaw(aux,200,38);
}
}
<!DOCTYPE html>
<html>
<head>
<title>Arduino SD Card Web Page using Ajax</title>
<script>
function GetSwitchState()
{
nocache = "&nocache=" + Math.random() * 1000000;
var request = new XMLHttpRequest();
request.onreadystatechange = function()
{
if (this.readyState == 4) {
if (this.status == 200) {
if (this.responseText != null) {
document.getElementById("switch_txt").innerHTML = this.responseText;
}
}
}
}
request.open("GET", "ajax_switch" + nocache, true);
request.send(null);
setTimeout('GetSwitchState()', 1000);
}
</script>
</head>
<body onload="GetSwitchState()">
<h1>Arduino Switch State from SD Card Web Page using Ajax</h1>
<p id="switch_txt">Switch state: Not requested...</p>
</body>
</html>