Good afternoon guys!
Sorry.. I don't know to speak and write English very well..
I have Arduino duemilanove atmega 328 + ethernet shield.
I'm doing a code that turn ON and turn off a LED.
My problem is: I turn ON the ledPin 4 and I close my browser. When I open the browser with the ethernet IP, automatically the ledpin turn OFF.
I want that the ledPin 4 keeps the previous status.
#include <String.h>
#include <Ethernet.h>
#include <SPI.h>
byte mac[] = {
0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; //physical mac address
byte ip[] = {
192, 168, 1, 243 }; // IP
byte gateway[] = {
192, 168, 1, 10 }; // roteador
byte subnet[] = {
255, 255, 255, 0 }; //Subnet
Server server(80); //Porta
byte sampledata=50;//some sample data - outputs 2 (ascii = 50 DEC)
int ledPin = 4;//Pino do Led
int fanPin = 5;// Pino do Fan
int analogPin = 0; //Pino Termistor
int tempc= 0, tempf=0,tempk=0;
int samples[8];
int i;
String readString = String(30);
boolean LEDON = false;
boolean FANON = false;//LED status flag
void setup(){
Ethernet.begin(mac, ip, gateway, subnet);
pinMode(ledPin, OUTPUT);
pinMode(fanPin, OUTPUT);
Serial.begin(9600); //enable serial datada print
}
void loop(){
Client client = server.available();// Cria uma conexao cliente
if (client) {
while (client.connected()) {
if (client.available()) {
char c = client.read();
//read char by char HTTP request
if (readString.length() < 30)
{
//store characters to string
readString += c;
}
for(i = 0; i<=7 ;i++){
samples
= ( 5.0 * analogRead(analogPin) * 100.0) / 1024.0;
tempc = tempc + samples; // somando os 8 valores lidos
}
tempc = tempc/8.0; // tirando a media dos 8 valores
tempf = (tempc * 9)/ 5 + 32; // converte para fahrenheit
tempk= tempc+273; // converte para Kelvin
delay(100);
if (tempc >= 33){
digitalWrite(fanPin, LOW);
FANON = true;
}
else{
digitalWrite(fanPin, HIGH);
FANON = false;
}
//output chars to serial port
Serial.print(c);
//if HTTP request has ended
if (c == '\n') {
//lets check if LED should be lighted
if(readString.indexOf("L=1") >=0)
{
//led has to be turned OFF
digitalWrite(ledPin, LOW); // set the LED off
LEDON = true;
}
else{
//led has to be turned ON
digitalWrite(ledPin, HIGH); // set the LED on
LEDON = false;
}
// now output HTML data starting with standart header
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println();
//set background to yellow
client.print("<body style=background-color:white>");
//send first heading
client.print("<meta http-equiv='refresh' content='10' ; url='192.168.1.243'>");
client.println("<center>");
client.println("<font color='blue'><h1>Casa Inteligente</font></h1>");
client.println("<table border='1'><tr>");
client.println("<td>");
client.println("<center>");
client.println("<h1><font color='blue'>Luz do Quintal</h1>");
//controlling led via checkbox
client.println("<form method=get name=LED><input type=checkbox name=L value=1>LUZ<br><input type=submit value=Aplicar></form>");
client.println("<br><font size='1'>(1=ON / 0=OFF)<br>");
//printing LED status
client.print("<font size='5'>Status: ");
if (LEDON){
client.println("<font color='green' size='5'>ON");
}
else{
client.println("<font color='red' size='5'>OFF");
}
client.println("</center>");
client.println("</td>");
client.println("</tr></table><br><br>");
client.println("Temperatura C:"); //Mostra as temperaturas em C F e K
client.println(tempc);
client.println("\t");
client.println("Temperatura F:");
client.println(tempf);
client.println("\t");
client.println("Temperatura K:");
client.println(tempk);
client.println("\n");
client.println("</center>");
client.println("</body></html>");
readString=""; //clearing string for next read
client.stop(); //stopping client
}
}
}
}
}
Thanks. 
