RPi + PIR sensor scan + LED output

detect.py

import RPi.GPIO as GPIO
import time

GPIO.setwarnings(False)
GPIO.setmode(GPIO.BOARD)

# LED
GPIO.setup(3, GPIO.OUT)

# PIR sensor
GPIO.setup(11, GPIO.IN)

# set LED to OFF
GPIO.output(3, 0)

while True:
        data = GPIO.input(11)

        if data == 0:
                GPIO.output(3, 0)
                time.sleep(1)

        else :
                GPIO.output(3, 1)
                time.sleep(1)