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  • Arduino - Web Server - Remote Push

    Web Remote Push is one of the built-in embedded web apps in PHPoC [WiFi] Shield.

    When an user presses/releases a button on this web apps, the web app sends an uppercase/lowercase characters corresponding with the name of button to Arduino via WebSocket.

    This tutorial shows how to use Web Remote Push to control Arduino.



    Hardware Required


    Circuit
    • Stack PHPoC Shield or PHPoC WiFi Shield on Arduino Uno or Mega

    Note that: Arduino communicates with PHPoC [WiFi] Shield via pins 10, 11, 12 and 13 on the Uno, and pins 10, 50, 51 and 52 on the Mega. Therefore, these pins CANNOT be used for general I/O.

    How Web Remote Push Works

    Web Remote Push is a web apps that is stored on PHPoC [WiFi] Shield.

    When an user access this web app via a web browser, web apps is displayed on web browser.

    When the user clicks "Connect" button on this web app, a WebSocket connection is created between web app and Arduino.

    When the user presses on a button, web app sends a uppercase name of button to Arduino.
    When the user releases on a button, web app sends a lowercase name of button to Arduino.


    Install Arduino IDE

    If you have not install Arduino IDE yet, please download and install Arduino IDE .




    Install Library
    • Run Arduino IDE.
    • Navigate to Sketch > Include Library > Manage Libraries

    • Search "Phpoc" on search bar of the Library Manager.

    • Select the PHPoC library and press the [Install] button.

    • Restart Arduino IDE for the next step.


    Setup Network Information
    This part is needed only for the first use.

    1. If Ethernet is used
    In case of using PHPoC Shield (P4S-348), you have two options to connect to network: Ethernet or WiFi.
    If using Ethernet, please follow this instruction to connect the shield to Ethernet.


    2. If WiFi is used
    WiFi is available in both P4S-347 and P4S-348. Please follow:

    Source Code
    • Open "WebRemotePush" example on Arduino IDE

      Code:
      	// Arduino Web Server - Remote Control (Push Button)
      	//
      	// PHPoC Shield and PHPoC WiFi Shield are Internet Shields for Arduino Uno and
      	// Mega.
      	//
      	// These Shields have the buit-in web server and WebSocket server. These Shields
      	// contain some buit-in embedded web apps. One of the buit-in embedded web apps
      	// is "Web Remote Push". When an user presses/releases a button on this web
      	// apps, the web app sends an uppercase/lowercase characters corresponding with
      	// the name of button to Arduino via WebSocket.
      	//
      	// This example code shows how Arduino communicate with the "Web Remote Push".
      	//
      	// Arduino communicates with PHPoC [WiFi] Shield via pins 10, 11, 12 and 13 on
      	// the Uno, and pins 10, 50, 51 and 52 on the Mega. Therefore, these pins CANNOT
      	// be used for general I/O.
      	//
      	// This example code was written by Sollae Systems. It is released into the
      	// public domain.
      	//
      	// Tutorial for the example is available here:
      	// https://forum.phpoc.com/articles/tutorials/1249-arduino-web-server-remote-push
      
      	#include <Phpoc.h>
      
      	PhpocServer server(80);
      
      	void setup() {
      	  Serial.begin(9600);
      	  while(!Serial)
      	    ;
      
      	  // initialize PHPoC [WiFi] Shield:
      	  Phpoc.begin(PF_LOG_SPI | PF_LOG_NET);
      	  //Phpoc.begin();
      
      	  // start WebSocket server
      	  server.beginWebSocket("remote_push");
      
      	  // print IP address of PHPoC [WiFi] Shield to serial monitor:
      	  Serial.print("WebSocket server address : ");
      	  Serial.println(Phpoc.localIP());
      	}
      
      	void loop() {
      	  // wait for a new client:
      	  PhpocClient client = server.available();
      
      	  if (client) {
      	    if (client.available() > 0) {
      	      // read a byte incoming from the client:
      	      char thisChar = client.read();
      
      	      // when an user presses a button on the web apps, the web app sends an
      	      // uppercase character corresponding with the name of button to Arduino.
      	      // When an user releases a button on the web apps, the web app sends a
      	      // lowercase character corresponding with the name of button to Arduino.
      	      if(thisChar == 'A')
      	         Serial.println("button A press");
      	      if(thisChar == 'a')
      	         Serial.println("button A release");
      	      if(thisChar == 'B')
      	         Serial.println("button B press");
      	      if(thisChar == 'b')
      	         Serial.println("button B release");
      	      if(thisChar == 'C')
      	         Serial.println("button C press");
      	      if(thisChar == 'c')
      	         Serial.println("button C release");
      	    }
      	  }
      	}
    • The line-by-line explaination of code is presented inside the code.
      For more detail of functions's reference, please refer to PHPoC Shield for Arduino Library Reference
    • Compile the example code and upload to Arduino by clicking "Upload" button on Arduino IDE



    Test and Result
    • Open Serial Monitor of Arduino IDE.
    • Copy the IP address of the shield and keep the Serial Monitor windows open.
    • Open a web browser from PC, smartphone or tablet.
    • Paste IP address of PHPoC [WiFi] Shield on address bar.
    • Web browser shows web page that displays the list of web app.
    • Click Web Remote Push icon. (You can also access directy by typing: ip_address/remote_push.php).
    • Click "Connect" button.

      Right after connection between web app and Arduino is established, this web app sends lowercase name of each button to Arduino. It means that all button currently is released.
    • There are some buttons on web app. Press and release button A.
    • See log on Serial Monitor.

      As we can see, state of button A is sent to Arduino.

    Now you can try controlling LEDs via this web app.


    Web Customization

    Note that: The customization of this web app is only available on:
    • PHPoC [WiFi] Shield R2
    • PHPoC [WiFi] Shield R1 with upgrade firmware to v1.5.0 (or higher)


    The web app has been created and preload to PHPoC [WiFi] Shield. User does not need to write the web code. User just needs to write Arduino code based on the Arduino example. However, user can modify user interface of web app via a setting page.

    Custommable Parameters:
    • Width: settable value.
    • Button Name: settable string.
    • Display/hide Button: if a button name is nothing, that button is hidden, and vice versa


    How To
    • Click "Setup" on Web App
    • It shows setup page. The below is default setting.
    • Change setting parameters as you want. For example:
    • Back to Web App, we can see the changes



    See Also

    References
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