pir2

import RPi.GPIO as GPIO
import time
from subprocess import call

GPIO.setwarnings(False)
GPIO.setmode(GPIO.BOARD)
GPIO.setup(11, GPIO.IN)
while true:
    i = GPIO.input(11)
    if i ==0:
        print("Screen off", i)
        call("vcgencmd display_power 0")
        time.sleep(1)
    elif i ==1:
        print("Screen on", i)
        call("vcgencmd display_power 1")
        time.sleep(30)