Finally, I’ve finnished my script, and it works like a charm. I paste it here if someone else need it.

#!/usr/bin/python3 # PACKAGES NEEDED TO WORK: sudo apt install python3 python3-rpi.gpio # My screen has an USB port, that turns on when screen is on, and off when screen is off. # So, I made a voltage divider with a few resistors to get 3 volts, to activate pin 6 (BCM) # on the raspberry Pi. In this way, the script can 'know' if Screen is ON or OFF. import RPi.GPIO as GPIO import time import subprocess from subprocess import call GPIO.setmode(GPIO.BCM) GPIO.setup(22, GPIO.IN) # PIR's output GPIO.setup(6, GPIO.IN) # Screen power detector GPIO.setup(25, GPIO.OUT) # Relay Input GPIO.setwarnings(False) while (GPIO.input(6) == 0): # IF SCREEN IS ON if (GPIO.input(22) == 1): # PIR DETECTS MOTION call(('/opt/vc/bin/vcgencmd', ' display_power', '1')) GPIO.output(25, GPIO.HIGH) # RELAY ACTIVATION time.sleep(3) GPIO.output(25, GPIO.LOW) time.sleep(60) # THE TIME WE WANT THE SCREEN TO STAY ON if (GPIO.input(22) == 1): # IF PIR DETECTS A NEW MOVEMENT, time.sleep(60) # ACTIVATES THE MIRROR ANOTHER AMOUNT OF SECONDS else: GPIO.output(25, GPIO.HIGH) # WITH THIS LINE, THE SCREEN POWERS OFF TO SAVE ENERGY time.sleep(3) GPIO.output(25, GPIO.LOW) else: GPIO.output(25, GPIO.LOW) while (GPIO.input(6) == 1): # IF SCREEN IS OFF if (GPIO.input(22) == 1): # PIR DETECTS MOTION call(('/opt/vc/bin/vcgencmd', ' display_power', '1')) GPIO.output(25, GPIO.LOW) # SAME AS ABOVE, BUT THIS TIME DON'T ACTIVATE THE RELAY time.sleep(60) if (GPIO.input(22) == 1): time.sleep(60) else: GPIO.output(25, GPIO.HIGH) # WITH THIS LINE, THE SCREEN POWERS OFF TO SAVE ENERGY, AGAIN time.sleep(3) GPIO.output(25, GPIO.LOW) else: GPIO.output(25, GPIO.LOW) call(('/usr/bin/python3', '/home/pi/SCRIPTS/pir.py'))