Communicating to and from a microSD card

hi! name renato , apprentice regards arduino. have project doing school requires me have website can send commands arduino board have motor spin.  i m having problem figuring out how can have function or on website code call arduino code make motor move. how communicate website in sd. card , arduino code outside of it? want have function moves motor when alarm on website sounds. in snippet of website:

code: [select]

if (typeof this.hourwake!="undefined"){ //if alarm set
                       if (this.ctref.title==(this.hourwake+":"+this.minutewake+":"+this.secondwake)){
                               clearinterval(jsalarm.timer)
                               countdowntimer()
                       }
               }


heres code. website on sd card can accessed through website:www.itcup.skuttcatholic.com. can inspect source on website see code of it.

here code on arduino. reads sd card:

code: [select]

#include <spi.h>
#include <ethernet.h>
#include <sd.h>

// mac address ethernet shield sticker under board
byte mac[] = { 0x90, 0xa2, 0xda, 0x0f, 0x01, 0xe8 };
ipaddress ip(192,168,0,38);// ip address, may need change depending on network
ethernetserver server(80);  // create server @ port 80

file webfile;

void setup()
{
   ethernet.begin(mac, ip);  // initialize ethernet device
   server.begin();           // start listen clients
   serial.begin(9600);       // debugging
   pinmode(9,output);
   
   // 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 index.htm 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.");
}

void loop()
{
   ethernetclient client = server.available();  // try client

   if (client) {  // got client?
       boolean currentlineisblank = true;
       while (client.connected()) {
           if (client.available()) {   // client data available read
               char c = client.read(); // read 1 byte (character) client
               // last line of client request blank , ends \n
               // respond client after last line received
               if (c == '\n' && currentlineisblank) {
                   // send standard http response header
                   client.println("http/1.1 200 ok");
                   client.println("content-type: text/html");
                   client.println("connection: close");
                   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 client
                       }
                       webfile.close();
                   }
                   break;
               }
               // every line of text received client ends \r\n
               if (c == '\n') {
                   // last character on line of received text
                   // starting new line next character read
                   currentlineisblank = true;
               }
               else if (c != '\r') {
                   // text character received client
                   currentlineisblank = false;
               }
           } // end if (client.available())
       } // end while (client.connected())
       delay(1);      // give web browser time receive data
       client.stop(); // close connection
   } // end if (client)
}

 


the simplest approach have web app open arduino's serial port , send messages arduino, , have arduino respond via serial port. there whole section of forum dedicated interfacing arduino software on pc , i'm sure you'll find examples in playground showing how in various types of web server.

Arduino Forum > Using Arduino > Project Guidance > Communicating to and from a microSD card

arduino