Simple PHP-Web-Gpio example switching leds

Rinus van Weert

As a first project I implemented an old application with which one can switch 2 leds, connected to gpio ports, on and off. The application is straight forwards, using only PHP and PHP-CGI.
First you have to install PHP and PHP-CGI (see openwrt-wiki)

opkg update
opkg install php5 php5-cgi

Notice the /etc/php.ini file afterwards.
You also need to add the line:

list interpreter ".php=/usr/bin/php-cgi"

to the 'main' section of the /etc/config/uhhtpd file

Restart your webserver with

/etc/init.d/uhttpd restart

and now you're up and running for using PHP

I used gpiocfg instead of fast-gpio mainly because I didn't know of the existence of fast-gpio. In the first few lines of the PHP file you can select the gpio pins to use. Start using the webpage calling Omega-abcd.local/php/SwitchLeds.php in your browser.

The PHP file is:
SwitchLeds.php
Place this file in /www/php, otherwise you need to change the above URL.
Have fun!

E. H

@Rinus-van-Weert Great! Thanks for the example!

Yale E. Goldman

Hi Rinus,

Thanks for the example. I got stuck as follows: php5 installed OK, but messages came back from opkg "Unknown package 'php5-cgi'." and "cannot install php5-cgi". There is no file php-cgi in the directory /usr/bin. Do you have a suggestion?

Thank you.

Bo Barry

Any update on this? My first project and it crashed as in the previous comment.

Off to find another project to try, I guess. Bo

Lazar Demin

@Yale-E-Goldman @Bo-Barry

Try updating to the latest firmware, running opkg update and then trying opkg install php5 php5-cgi again.
Worked on my end.

Toby Foord

Thanks for the pointers here @Rinus-van-Weert! I've managed to get PHP up and running without any fuss at all. Only last thing I'd add is whilst you're in modifying uhttpd you might want set up a secondary site.

So in /etc/config/uhttpd I've added the following below the main config definition

...

config uhttpd 'myapp'
        list listen_http '0.0.0.0:4000'
        list listen_http '[::]:4000'
        list interpreter '.php=/usr/bin/php-cgi'
        option home '/www/myapp'
        option cgi_prefix '/cgi-bin'
        option index_page 'index.php'
        option error_page '/oopsie.html'
...

The benifit (for me) being that, if you wanted to, you can access this site from the wider world without exposing the console.

Happy Hacking all

Bo Barry

@Bo-Barry got it loaded, now don't know to 'run it'. First time PHP.

Anco van der Kolk

@Rinus-van-Weert thanks for the example.
find an small error on this line: "to the 'main' section of the /etc/config/uhhtpd file" => uhhtpd = uhttpd

@Bo Barry you can run the program in your brouwser, http:\ipadres.for.onion\php\SwithcLeds.php
(if you put the script in www/php as SwitchLeds.php)

I have also a relay expansion and make 2 functions for this:

function initRelay( ){ // init Relay expansion
    $command = 'relay-exp -i';
	exec( $command ); //init 
}

function writeRelay( $pen, $value){ 
	if ( is_numeric( $value) )	// check if value is a number, could also be empty, if so write value tot output pin
	{	$command = 'relay-exp ' .$pen .($value == 1 ?  ' 1' : ' 0');
		$res = exec( $command );
		echo $res;
	}
	return $value;
}

but there is no way to get the status of the relays. you only now the status when init.

Yale E. Goldman

@Lazar-Demin Hi Lazar, After opkg update, php5-cgi installed and I was able to run PHP srcipts, like SwitchLeds and others. Thanks for the help. I had recently done the opkg update, so how often does it need to be run?

Boken Lin

@Yale-E.-Goldman Package indexes are usually updated daily, so it's recommended that you do an opkg update before each opkg install.

Kyle

@Boken-Lin @Rinus-van-Weert How can I install the "SwitchLeds.php" file directly to the onion omega? Thanks for the awesome example, I have been looking at making a project like this, but I had no idea whatsoever on what to do.
Thanks,
Kyle

Anco van der Kolk

Hi, I have made a class that use this functions to control the Onion
php_onion

I found an other interesting topic here that use an other approach

Anco van der Kolk

@Kyle I use pscp from putty with flag -scp
Use

>PSCP.exe -scp -pw {onionpasw} source\* root@{onion.IP}:/www/php

to copy source to php directory

Fred Blais

@Kyle from your Omega, you can also do a wget to get the file

wget --no-check-certificate https://community.onion.io/uploads/files/1446719911755-switchleds.php

Kyle

@Anco-van-der-Kolk
@Fred-Blais
Thanks guys! will do!