backlight control for rpi tft screen

gistfile1.txt

#!/usr/bin/env python
import RPi.GPIO as GPIO
import time
import os

#adjust for where your switch is connected
buttonPin = 18
sleepDelay = 1.0
GPIO.setmode(GPIO.BCM)
GPIO.setup(buttonPin,GPIO.IN, pull_up_down=GPIO.PUD_UP)

#MAKE ALL OF THIS NATIVE
os.system("echo 252 > /sys/class/gpio/export")
os.system("echo 'out' > /sys/class/gpio/gpio252/direction")
os.system("echo '1' > /sys/class/gpio/gpio252/value")


while True:
  #assuming the script to call is long enough we can ignore bouncing
  if (GPIO.input(buttonPin) == 0):
    #get current state of backlight
    curValFile = open("/sys/class/gpio/gpio252/value", "r")
    curVal = curValFile.read()
    curVal = int(curVal)
    curValFile.close()
    #this is the script that will be called (as root)


    if curVal == 0:
      os.system("echo '1' > /sys/class/gpio/gpio252/value")
      time.sleep(sleepDelay)
    elif curVal == 1:
      os.system("echo '0' > /sys/class/gpio/gpio252/value")
      time.sleep(sleepDelay)

Thank you! I have been trying to get that button to work but without any luck, was almost giving up and then i found this, you really made my day.

Only thing i needed to change was that on my pi i use gpio508 instead of gpio252 :)

Great work!