• Linux Serial Port Example

Thank you for your very helpful comments. I have successfully applied a 10uF capacitor to my setup.

This is a step-by-step guide to using the serial port from a program running under Linux; it was written for the Raspberry Pi serial port with the Raspbian Wheezy distribution. However, the same code should work on other systems.

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'.

Linux Serial Port Example

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. 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. 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. Driver epson stylus cx3500 windows 7. 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 •.