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    PIR Sensor - Sleep LCD monitor

    Scheduled Pinned Locked Moved Unsolved Hardware
    monitorlcdpir
    10 Posts 4 Posters 10.6k Views 3 Watching
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    • Andromede88A Offline
      Andromede88
      last edited by

      Hi,

      I want to sleep my LCD Monitor with the plugin MMM-PlR-Sensor.
      But I don’t cut my front panel LCD, can you validate my schema, please ?

      0_1489582610690_MagicMirror PIR.jpg

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      • S Offline
        steve23p9835908
        last edited by

        Hi,

        I think that you may be trying to achieve the same thing as me. Is your aim to have the Pi send a signal to the power button of the tv screen so that it enters sleep mode? Personally, I think that this is a good solution since it should avoid the “no signal” issue which occurs when the module cuts the HDMI signal.

        I assume that you plan to use “relayPIN” option to set the output pin to the tele but how do you determine the correct voltage and signal to send or is it a standard?

        As I say, I think that this could be a great way of allowing the mirror to switch the monitor on or off neatly (ie. avoiding splash screens or “no signal” messages). Happy to offer my help in this but, regrettably, I have very little experience or knowledge.

        Let me know how you get on,
        Steve

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        • Andromede88A Offline
          Andromede88
          last edited by

          Thank you for your help, I spent part of my weekend on the project.
          I change my mind, I do not think it’s good to put the 5v on the front panel !!
          So I went through a relay and it works.
          I just have to find the best way for the relay to trigger only when a person triggers the PIR and after a delay, triggers to pause.
          Sorry for my English !!

          0_1490000505400_MagicMirror PIR v2.jpg

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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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