Zoltan Hudak / WebSwitch_mbed-dev

HTTP Server serving a simple webpage which enables to remotely turn LED1 on/off. Compile, download, run and type 'IP_address/secret/' (don't forget the last '/') into your web browser and hit ENTER.

Dependencies:   EthernetInterface mbed-rtos mbed-dev

Turn LED1, or other digital output, on/off using a web browser.

In this example we create a HTTP server that will serve a simple Web page to remotely turn LED1, or other digital output, on/off by using a web browser.

/media/uploads/hudakz/webswitch_desktop.png/media/uploads/hudakz/webswitch_mobile01.jpg

Notice that DHCP is turned on by default. The IP address assigned to the WebSwitch server along with an instruction how to use it is printed to the connected PC's serial terminal window during program start up.

The project was inspired by the Tuxgraphics Web Switch. Thank you Guido!

For a Web Switch using

Diff: main.cpp

Revision:
2:4a51bdd24745
Parent:
1:c024e74b3a75
--- a/main.cpp	Fri Apr 14 07:17:03 2017 +0000
+++ b/main.cpp	Mon May 01 20:03:14 2017 +0000
@@ -19,6 +19,7 @@
 const int           ON = 1;
 
 DigitalOut          sw(LED1);
+float               roomTemp = 21.8;    // A temperature sensor output
 
 const string        PASSWORD = "secret";    // change as you like
 const string        HTTP_OK = "HTTP/1.0 200 OK";
@@ -26,10 +27,11 @@
 const string        UNAUTHORIZED = "HTTP/1.0 401 Unauthorized";
 string              httpHeader;     // HTTP header
 string              httpContent;    // HTTP content
+
 /**
  * @brief   Defines a custom MAC address
  * @note    Uncomment the code below to define a unique MAC address.
- *          Modify the mac array items as needed. 
+ *          Modify the mac array items as needed.
  * @param
  * @retval
  */
@@ -103,24 +105,26 @@
  * @retval
  */
 string& showWebPage(uint8_t status) {
-    httpContent = "<h2>WebSwitch - Smart Home</h2>\r\n";
+    char roomTempStr[5];
 
-    httpContent += "<pre>Temperature:\t21.8&deg;C\r\n</pre>";
+    //roomTemp = ds1820.read();
+    sprintf(roomTempStr, "%3.1f", roomTemp);
+
+    httpContent = "<h2><a href=\".\" title=\"Click to refresh the page\">Smart Home</a></h2>"; 
+    httpContent += "<pre>Temperature:\t" + string(roomTempStr) + "&deg;C\r\n</pre>";
 
     if(status == ON) {
-        httpContent += "<pre>\r\nHeating:\t<font color=#FF0000>ON </font>";
-        httpContent += " <a href=\"./?sw=0\">[Turn off]</a>\r\n";
+        httpContent += "<pre>\r\nHeating:\t<font color=#FF0000>On </font>";
+        httpContent += " <a href=\"./?sw=0\"><button>Turn off</button></a>\r\n";
     }
     else {
-        httpContent += "<pre>\r\nHeating:\t<font color=#BBBBBB>OFF</font>";
-        httpContent += " <a href=\"./?sw=1\">[Turn on]</a>\r\n";
+        httpContent += "<pre>\r\nHeating:\t<font color=#999999>Off</font>";
+        httpContent += " <a href=\"./?sw=1\"><button>Turn on</button></a>\r\n";
     }
 
-    //    httpContent += "  \r\n";
-    //    httpContent += "  <a href=\".\">Refresh status]</a>\r\n";
     httpContent += "</pre>\r\n";
     httpContent += "<hr>\r\n";
-    httpContent += "<pre>2017 ARMmbed Open Source</pre>";
+    httpContent += "<pre>2017 ARMmbed</pre>";
     return httpContent;
 }
 
@@ -157,7 +161,7 @@
 
     //setup ethernet interface
     ethernet.init(); //Use DHCP
-    //ethernet.init("192.168.1.36", "255.255.255.0", "192.168.1.1");   // Use static IP
+    //ethernet.init("192.168.1.181", "255.255.255.0", "192.168.1.1");   // Use static IP
     ethernet.connect();
     printf("USAGE: Type '%s/%s/' into your web browser and hit ENTER\r\n", ethernet.getIPAddress(), PASSWORD.c_str());
     printf("NOTE:  Don't forget to type the last '/'.\r\n\r\n");
@@ -259,3 +263,4 @@
         }
     }
 }
+