from gpiozero import PWMLED
import time
import os
from decimal import Decimal

led = PWMLED("GPIO12") 				#set the GPIO pin number you are using here. It uses the GPIO method of numbering.
						#details on pin numbering can be found here: https://gpiozero.readthedocs.io/en/stable/recipes.html
setZero=open("/var/www/html/alpha.txt", "w")
setZero.write("0")
file.close()

while True:					#a loop that never stops running
	try:					#prevents an bug with the code that would cause it to terminate when writing to alpha.txt file
		initial=open("/var/www/html/alpha.txt", "r") 	#open the alpha.txt file as read only. Declare it as "initial"
		brightness=(initial.read())	#declare the variable brightness by reading the variable "initial". Convert the string into a number
		x = Decimal(brightness)		#convert the number into a decimal. Store it as the variable X
		int_brightness = round(x,2)	#round the variable x to 2 decimal places. PHP should handle this, but just in-case. Store the rounded variable as int_brightness
		led.value = int_brightness	#set the brightness of the LED to the value of int_brightnesss
	except:
		()				#return nothing if code fails
	finally:
		()				#return nothing if code fails

setZero=open("/var/www/html/alpha.txt", "w")
setZero.write("0")
file.close()