Thank you for your very helpful comments. I have successfully applied a 10uF capacitor to my setup. So I no longer need to have the Arduino serial monitor open. I can now just use a web interface to control my RGB-LED experiment. The only issue is I still do not get any return statements from my Aduino code I:E in the serial monitor I have confirmation statements like 'RED ON'. In my web interface I an not getting this very important data.

I executed your stty command successfully but it made no difference. Can you please give me some more help? – Jan 30 '13 at 23:07 •. Hi Lukasz, your ongoing help has been invaluable and is very appreciated. I am marking your answer correct but I will appreciate more help with yet more complications I am experiencing. Hp Compaq Nx9005 Drivers.

I did this once with Debian to control an Arduino board with a PHP script and initially ran into the same problem. In Debian, you need to add the Apache user to the dialout group in order to allow it to make serial connection requests.

Your strategy of opening and reading the port works but only intermittently i.e: it works sometimes but the majority of the time, I get no output. When I do get output, it's everything in the serial port rather than the most recent. Can you offer more advise on this, please? PLUS, can you explain what the 'stty.' Command code does?

It doesn't seem to help my situation. – Feb 7 '13 at 11:03. You are probably trying to read when is no data on the serial port. El Otro Occidente Marcello Carmagnani Pdf Printer on this page.

You need to implement code to call code that can read at regular intervals. When you have got data, you should process it.

ReadPort() has worked fine for me. If the baud rate, parity, etc. Is adjusted properly, then you should not have any problem reading the serial port. Here is a sample of using the library for Arduino. It worked for me some time ago: deviceSet('/dev/ttyUSB0'); // Set for 9600-8-N-1 (no flow control) $serial->confBaudRate(9600); //Baud rate: 9600 $serial->confParity('none'); //Parity (this is the 'N' in '8-N-1') $serial->confCharacterLength(8); //Character length (this is the '8' in '8-N-1') $serial->confStopBits(1); //Stop bits (this is the '1' in '8-N-1') $serial->confFlowControl('none'); // Then we need to open it $serial->deviceOpen(); // Read data $read = $serial->readPort(); // Print out the data echo $read; // If you want to change the configuration, the device must be closed. Thanks for your answers and code example.

I updated my code with extracts of your but I still have no feedback. I updated my original question with my PHP/HTML script. I should be getting some feedback in 3 places but nothing is coming through. I should point out that my port (/dev/ttyACM0) is set to chmod 777 and I am actually calling Serial.println in my Arduino sketch which is why I am expecting some data to be returned in PHP. Infact, each time I use my web interface my LEDs successfully respond and my Arduino serial monitor prints my message(s) – Oct 29 '12 at 19:57 •.

PHP (PHP HyperText Preprocessor) is a server side scripting language popular with website developers. Typically PHP is used to generate web pages by interrogating a database and files. However PHP can also be used to control and communicate with other devices. This article explains how to configure PHP in order to send and receive data over a serial port on a unix system or a windows system. Prerequisites • PHP installed on your computer • An installed Brainboxes Serial port product Steps In Brief • Install PHP Direct IO extension • Configure PHP to use the extension • Use PHP file provided in the downloads • Open terminal program at other end of serial connection • Configure PHP file with correct local serial port settings • Go!

In-depth Install PHP Direct IO PHP by default does not offer good COM port support however a PHP extension called Direct IO does offers low level access to IO. We will use this extension for serial port communication. On unix system install the extension using PECL, open a terminal and type: sudo pecl install dio-0.0.7 On windows download the latest php direct io extension dll from:. The dll file should be copied into your php_extension folder (often located in ext or lib phpext ) Configure PHP to use the extension Next the php.ini file needs to be updated to tell it to use the extension.

To the bottom of the php.ini file add the following. Unix: extension=dio.so Windows: extension=php_dio.dll Restart PHP Unix: commands vary, on mac for example: sudo apachectl restart Windows: restart IIS webserver, or WAMP server Use PHP file provided in the downloads Download the file about and place it in your web-servers root directory. Navigate to the file the a web browser to confirm that an error is not produced which tells you to install PHP Direct IO. Open terminal program at other end of serial connection In order to test sending and receiving serial data in PHP, the other end of the serial port should be open.