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    PIR Sensor - Sleep LCD monitor

    Scheduled Pinned Locked Moved Unsolved Hardware
    monitorlcdpir
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    • S Offline
      steve23p9835908 @Andromede88
      last edited by

      @Andromede88

      Sorry for my lack of understanding but how did you connect the relay to the switch? Also what sort of switch is it?

      (http://www.electronicshub.org/switches/)

      Keep up the good work,
      Steve

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      • Andromede88A Offline
        Andromede88
        last edited by

        I connect directly to the output legs of the switch.

        0_1490004769823_MM2.jpg

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        • S Offline
          steve23p9835908
          last edited by steve23p9835908

          Great idea!

          Mine has a power button that you lightly touch and the monitor turns on or off (see pic https://goo.gl/photos/2rnRtovAJpCvTZXp7 ) This means that the button doesn’t have an on or off position. Would this mean that I’d need to get the Pi to send a short pulse to turn the monitor on or off or would it be continuous power to turn it on and no power to put into standby?

          Did you manage to avoid having a splash screen when it enters or leaves standby? (See video https://goo.gl/photos/QnGRPccautfSnBCt8 ). This is really important to me!

          One idea I thought of is to find an internal wire that provides power to the screen and install a relay there as well. Then run the script as follows;

          1. When movement detected activate power relay 1
          2. Wait 5s for splash screen to finish
          3. Activate power relay 2 which allows power to the screen

          Good work on the mirror by the way,
          Steve![0_1491074010177_20170401_205947.jpg](Uploading 100%)

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          • qu1queQ Offline
            qu1que Project Sponsor
            last edited by qu1que

            Hello, Have you already solved this issue? I am with the same idea, I have the PIR, a 3.3V relay and a python script so that, when it detects presence, the relay is activated and makes contact on the button to turn the screen on or off.

            The sript I’m using is this:

            import RPi.GPIO as GPIO
            import time
            
            GPIO.setmode(GPIO.BCM)
            GPIO.setup(22, GPIO.IN)
            GPIO.setup(25, GPIO.OUT)
            GPIO.setwarnings(False)
            
            while True:
                if GPIO.input(22):
                  	GPIO.output(25, GPIO.HIGH)
                else:
            	GPIO.output(25, GPIO.LOW)
            

            PIR output is connected on pin 22 (BCM). Relay input is connected on pin 25 (BCM).

            This simple script works correctly, but I want to go one step further. With this crypt, the screen is turned on or off when detecting presence.

            My idea is that (when the screen is off), when detecting presence, the screen will turn on for a while (for example 5 minutes), and then turn off again.

            For that purpose, I made this modification on the original script:

            import RPi.GPIO as GPIO
            import time
            import commands
            
            GPIO.setmode(GPIO.BCM)
            GPIO.setup(22, GPIO.IN)
            GPIO.setup(25, GPIO.OUT)
            GPIO.setwarnings(False)
            
            while True:
                if GPIO.input(22):
                  	GPIO.output(25, GPIO.HIGH)
                    commands.getoutput('vcgencmd display_power 1')
                    time.sleep (300)
                    commands.getoutput('vcgencmd display_power 0')
                else:
            	GPIO.output(25, GPIO.LOW)
            

            But this modification doesn’t work. Could someone help me with this? My knowledge in python is very elementary

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            • cruunnerrC Offline
              cruunnerr
              last edited by

              https://forum.magicmirror.builders/topic/6291/howto-turn-on-off-your-monitor-time-based-pir-button-app?page=1

              take a look at point 5.2 ;)

              u can define a delay time

              qu1queQ 1 Reply Last reply Reply Quote 0
              • qu1queQ Offline
                qu1que Project Sponsor @cruunnerr
                last edited by

                @cruunnerr
                I’ve tried that script yesterday, but it didn’t work for me. Thanks anyway

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                • qu1queQ Offline
                  qu1que Project Sponsor
                  last edited by qu1que

                  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'))
                  
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