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Topic: controlling Arduino with web page on separate server (Read 2104 times) previous topic - next topic


Hello everybody

I have a problem that i hope someone can help me solve. I´m using an Arduino Uno with a Ethernet shield and would like to control outputs using a webpage on a different server on my LAN i have tried to google for eksamples but i can´t find any.

So if someone  could help me with an eksample or a link to a tutorial i would be very grateful. The only tutorials i have been able to find uses the arduino as a server and i can´t use that.

Thank you very much


I´m using an Arduino Uno with a Ethernet shield and would like to control outputs using a webpage on a different server on my LAN i have tried to google for eksamples but i can´t find any.
The below server test code generates a web page with buttons that send the GET request to client/server connection IP address, to a specific LAN IP address, and thru a dynamic IP address server.

Code: [Select]

//zoomkat 04-10-15
//simple button GET with iframe code
//open serial monitor to see what the arduino receives
//use the ' instead of " in html ilnes
//address will look like when submited
//for use with W5100 based ethernet shields

#include <SPI.h>
#include <Ethernet.h>

byte mac[] = {
  0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; //ethernet shield mac address
byte ip[] = {
  192, 168, 1, 102 }; // arduino IP in lan
byte gateway[] = {
  192, 168, 1, 1 }; // internet access via router
byte subnet[] = {
  255, 255, 255, 0 }; //subnet mask
EthernetServer server(84); //server port

String readString;


void setup(){

  pinMode(4, OUTPUT); //pin selected to control
  //start Ethernet
  Ethernet.begin(mac, ip, gateway, gateway, subnet);

  //enable serial data print
  Serial.println("server test no-ip 04-10-15"); // so I can keep track of what is loaded

void loop(){
  // Create a client connection
  EthernetClient client = server.available();
  if (client) {
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();

        //read char by char HTTP request
        if (readString.length() < 100) {

          //store characters to string
          readString += c;

        //if HTTP request has ended
        if (c == '\n') {

          Serial.println(readString); //print to serial monitor for debuging

            //now output HTML data header
          if(readString.indexOf('?') >=0) { //don't send new page
            client.println("HTTP/1.1 204 Zoomkat\r\n\r\n");
          else {
            client.println("HTTP/1.1 200 OK"); //send new page
            client.println("Content-Type: text/html");

            client.println("<TITLE>Arduino GET test page</TITLE>");

            client.println("<H1>Zoomkat's simple Arduino button</H1>");
            client.println("Arduino served LAN: <a href='/?on1' target='inlineframe'>ON</a>");
            client.println("<a href='/?off' target='inlineframe'>OFF</a><BR><BR>");

            client.println("Remote served LAN: <a href='' target='inlineframe'>ON</a>");
            client.println("<a href='' target='inlineframe'>OFF</a><BR><BR>");

            client.println("Remote served no-ip: <a href='http://zoomkat.no-ip.org:84/?on1' target='inlineframe'>ON</a>");
            client.println("<a href='http://zoomkat.no-ip.org:84/?off' target='inlineframe'>OFF</a>");

            client.println("<IFRAME name=inlineframe style='display:none'>");         


          //stopping client

          ///////////////////// control arduino pin
          if(readString.indexOf("on1") >0)//checks for on
            digitalWrite(4, HIGH);    // set pin 4 high
            Serial.println("Led On");
          if(readString.indexOf("off") >0)//checks for off
            digitalWrite(4, LOW);    // set pin 4 low
            Serial.println("Led Off");
          //clearing string for next read

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The arduino webclient example https://www.arduino.cc/en/Tutorial/WebClient is a good place to start if all you want to do is have your arduino load a webpage and act on the results.

The trick is to modify the section shown below to look for specific strings and perform related actions.

Code: [Select]

if (client.available()) {
    char c = client.read();

See this thread http://forum.arduino.cc/index.php/topic,45629.0.html for ways to turn a bunch of individual chars into a nice String.

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