PHP PhpSerial - 18 examples found. These are the top rated real world PHP examples of PhpSerial extracted from open source projects. You can rate examples to help us improve the quality of examples. Download phpSerial Libs for free. Small project to provide serial support to PHP under POSIX environment. Helps to use setserial through PHP and provide 'drivers' for serial devices (the goal isn't to be exhaustive.
How can you use PHP to generate a serial number? The WebP Image Extension will enable you to view WebP images in the Windows 10 Microsoft Edge browser. WebP is a modern image format that provides lossless and lossy compression for smaller, richer images on the web.
(More Info) |
adapted from: http://www.fritz-hut.com/2012/08/30/php-serialclass-with-arduino-raspberrypi/
One very interesting type of application of the Raspberry Pi is to control our environment, typically some sort of home automation or monitoring device. For that, you need to be able to control and/or monitor hardware devices, like relays, temperature sensors and the like. The Raspberry Pi is not well adapted to directly controlling hardware because of its limited IOs (it does not have analog inputs or outputs for instance). Also, let's face it, in spite of the processing power of the CPU in the Raspberry PI, some tasks are simply more easily done with a small microcontroller like an Arduino or an 8051 (put your favorite microcontroller here...)
This page will show you how to interface a web page served from a Raspberry Pi to an Arduino via the serial port.
Installing PHP-Serial
PhpSerial::readPort PHP Code Examples - HotExamples
Download it from Github: https://github.com/Xowap/PHP-Serial
Configuring your Raspberry Pi for PHP serial class
Before you can use the class some stuff must happen (I assume you have Apache installed and PHP enabled and the Raspberry Pi is running). First we need to find out what user runs PHP. Create a file named whoami.php under the /var/www directory as follows:
Add the following content:
Then fetch the whoami.php page from your laptop or PC's web browser.
For Apache on Raspbian, the browser will return www-data. It may be different with other web servers.
Every serial connection (virtual of physical) is owned by the dialout group, so if we add www-data to the dialout group our PHP scripts should be able to open/read/write the serial device, which is better than running everything as root, or setting permissions to 'all can read from and write to everything'. The following command will add the dialout group to www-data.
Running the command groups www-data give the following result:
Great, www-data belongs to dialout and www-data. Now RESTART your Raspberry Pi.
Testing the connection
Php File Extension
To test the PHP setup, I’ll write a simple script that just sends a string to the Arduino.
First I enable all the errors, the PHP_Serial class issues warnings on failure and by default they aren’t displayed (in a normal PHP configuration). Then I include the PHP_Serial class file. Next I initiate a new phpSerial object called $serial and configure some parameters. We don’t have parity, characters are 8 bits and we use 1 stop bit. After that I can open the device send my message and *close it*. Finally I echo some feedback to the browser saying I did my job.
Note: It is very important to close the serial device each time, otherwise it will stay open and the script will only work once until your reboot.
I don’t know how or why but for every connection I open, I get question marks (unknown chars). They have a decimal value of 254 and I really don’t have a clue what they are. When I use a normal echo command in the terminal I don’t get those characters.
Debugging the PHP serial class
A lot can go wrong, so lets cover the basics.
If your browser keeps loading and nothing happens then your Serial connection is locked up, restart your Pi to release it and see that you close the device in your PHP script.
If that does not fix it then there might be a problem with user permissions. Go back to the first part of this page to make user that the user www-data belongs to the dialout group. Use the following command to check if the dialout group has access to the /dev/ttyAMA0 device:
If the browser says the message is sent but you don’t see anything on the Arduino serial monitor then check for common flaws: unplugged cables, wrong level converter circuit, baud rate and so on.