查看“Microduino ENC Network (7)”的源代码

{{Language | Microduino ENC网络（七）}}
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==Objective==
This tutorial will show you how to control a LED from a web page.

==Equipment==
*'''[[Microduino-Core]]'''
*'''[[Microduino-FT232R]]'''
*'''[[Microduino-ENC28J60]]'''
*'''[[Microduino-RJ45]]'''

*Other equipment
**USB cable 

==A bit of HTML==
First, you need to write an HTML page that will be the web interface Arduino sends to your web browser:
[[File:htmlcode.jpg|600px|center|thumb]]

This web page is very simple: a label about LED’s actual status and a button to change it.

Looking at page’s HTML source, you can identify the variable elements; i.e. the elements  that change according to the LED’s status:

From the source, you can also understand what’s going to happen when the user clicks the button: his browser will ask to Arduino a web page named:

/?status=ON, if the LED has to be turned on
/?status=OFF, if the LED has to be turned off
The use of ?name=value to send data to a web server reflects the standard syntax of HTML forms using the GET method.

==Schematic==
*Microduino-ENC28J60
*Microduino-RJ45
*Microduino-Core
*Microduino-FT232R
Stack all modules and then connect the ethernet cable, as follows:

[[File:MicroduinoENCLED.jpg|600px|center|thumb]]

==Program==

Refer to ENCnetworkseven

==Debug==
Step 1：Download the EtherCard library and copy to your libraries fold of IDE, then restart IDE.
https://github.com/jcw/ethercard

Step 2：Explain the program:

//Two static strings (ON, OFF) and two variables are defined: the variables will be used in HTML page creation, associating to them one of the two static strings.

    char* on = "ON";
    char* off = "OFF";
    char* statusLabel;
　　char* buttonLabel;

//In the setup(), in addition to EtherCard library setup, LED’s initial status (off) is configured.

      pinMode(ledPin, OUTPUT);
      digitalWrite(ledPin, LOW);
      ledStatus = false;

//In the main loop(), our sketch parse browser’s request (saved in Ethernet::buffer buffer starting from pos position) looking for status ON/OFF commands.

        if(strstr((char *)Ethernet::buffer + pos, "GET /?status=ON") != 0) {
          Serial.println("Received ON command");
          ledStatus = true;
        }

        if(strstr((char *)Ethernet::buffer + pos, "GET /?status=OFF") != 0) {
          Serial.println("Received OFF command");
          ledStatus = false;
        }

//The status of ledPin (Arduino’s PIN the LED is connected to) is updated and the two string variables are associated to the correct labels:

        if(ledStatus) {
          digitalWrite(ledPin, HIGH);
          statusLabel = on;
          buttonLabel = off;
        } else {
          digitalWrite(ledPin, LOW);
          statusLabel = off;
          buttonLabel = on;
        }

Step 3: Connect the bulb, as follws:
[[File:connectLED.jpg|600px|center|thumb]]

Step 4：Copile the code and download it.

Step 5：Use the browser to access the Microduino's IP, then click ON/OFF, observe the bulb's state.

==Result==

Access Microduino's IP, you will see following picture：
[[File:LEDWebPage.jpg|600px|center|thumb]]

Then you can use the browser to control the bulb.

==Video==

http://v.youku.com/v_show/id_XNzAzMzM0NzUy.html

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