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I am planning to set up an HTML-PHP website gui which opens up in Chromium Kiosk mode.

I want the gui to count the number of falling edge interrupts and show the count on the GUI.

I have achieved this functionality quite easily using a C-program, but I don't know how to update the count php-variable on the GUI website.

The wiringPi GPIO utility does provide some functionality regarding GPIO pins, but not related to interrupts. This is the tutorial regarding wiringPi/PHP.

Any suggestions on how to tackle this problem?

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Since you're going to be using Python, why use WiringPi? You can read the GPIO pins directly from Python in many cases. http://raspberry.io/projects/view/reading-and-writing-from-gpio-ports-from-python/

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  • I am not using Python at all. But can switch to Python as well. But, the problem still stands, how can I update the HTML webpage GUI through python application running at the back? – Mohsin Anees Sep 25 '17 at 17:28
  • For somethings (thermocouples, for sure) the values are written to a file. – CharlieHorse Sep 25 '17 at 18:05
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I'd recommend taking a look at phpi-websocket, it has everything you need to implement what you're after, so it'd just be a matter of looking at the examples and trimming out what you don't need.

It uses a native PHP library to interact with the edge detection registers and does an event-based push to an HTML page via websockets.

As mentioned before, there's more than you need in the example - you're mainly interested in this part on the server:

$pin->on(\Calcinai\PHPi\Pin::EVENT_LEVEL_CHANGE, function() use($pin, $controller){
    $controller->broadcast('pin.level', ['pin' => $pin->getPinNumber(), 'level' => $pin->getLevel()]);
});

which handles the pin change event and broadcasts it. Then on the client

.bind('pin.level', function(data){
    $('.pin[data-bcm="'+data.pin+'"]').data('level', data.level);
})

which binds that javascript event to the UI. You can easily make it do something like increment a variable instead.

disclaimer: I'm the author and maintainer of the above library

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