PHP executes Python but not GPIO

[Cyroq]

Hi all,

For an automation project I'm hooking my catfeeder-system up to a webserver. I've got the server running and by using shell_exec() in the php file, I can execute .py scripts.
However, as soon as the script needs to control GPIO functions, the script stops working (or at least, I don't see any new output and the connected LEDs aren't doing anything. Yes, my catfeeder-system needs LEDs ).

Code: Select all

def fadeInRed():
	print("fadeInRed().")
	GPIO.setmode(GPIO.BOARD)
	GPIO.setup(12, GPIO.OUT)

	p = GPIO.PWM(12, 50)  # channel=12 frequency=50Hz
	p.start(0)

	for dc in range(0, 101, 8):
    		p.ChangeDutyCycle(dc)
	        time.sleep(0.3)
	time.sleep(1)
	p.ChangeDutyCycle(0)
	p.stop()
	GPIO.cleanup()

The print is executed, but the next lines are not.
Does GPIO need special permissions perhaps? The script works fine when executed by ssh or by fysical button.

[DougieLawson]

Your webserver runs as user www-data, group www-data. That doesn't have permission.

sudo usermod -a -G gpio www-data
sudo systemctl restart apache2

[Cyroq]

That was an easy fix. Thanks!