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A New Chapter for MagicMirror: The Community Takes the Lead
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PIR-sensor and 7 inch touch LCD display for Raspberry-Pi

Scheduled Pinned Locked Moved Solved Troubleshooting
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  • S Offline
    Serimner
    last edited by Oct 11, 2019, 10:12 PM

    @sdetweil - Thank you for your feedback.
    It was one of the ideas I tested. The problem is that when MM updates its view (or the weather updates), bl_power is reset and the screen lights up again…

    /S

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    • Q Offline
      qu1que Project Sponsor
      last edited by Oct 12, 2019, 10:39 AM

      @Serimner Some time ago, when I was making my mirrors, I’d tried some PIR modules, and I could not make it work any of them. So, I’d write this python script and works perfect. Hope it helps:

      #!/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'))
      

      Here you can take a look at one of my projects:
      https://forum.magicmirror.builders/topic/7263/my-first-smart-mirror-in-a-frame-of-40-x-30-cm-with-raspberry-pi-zero-w/2

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      • S Offline
        Serimner
        last edited by Oct 13, 2019, 11:40 AM

        @qu1que - Thanks for your reply - really smart to use USB on the screen to see screen activity!
        But unfortunately vcgencmd does not work in my configuration/hardware.
        It sets the value, but it does not turn off the 7 inch touch LCD…

        Q 1 Reply Last reply Oct 14, 2019, 7:33 PM Reply Quote 0
        • Q Offline
          qu1que Project Sponsor @Serimner
          last edited by Oct 14, 2019, 7:33 PM

          @Serimner

          In this link explains how to do it for that screen:
          https://www.raspberrypi.org/forums/viewtopic.php?f=108&t=120968&start=25

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          • S Offline
            Serimner
            last edited by Oct 15, 2019, 9:01 PM

            Thanks for the posts with help and ideas!
            I have tried further and am currently testing with “xset” to turn off/on the screen and it seems to work well.

            I have “stolen” code and ides from these articles:
            Cheap PIR Sensors and the Raspberry Pi - Part 1
            Exit screensaver on Raspberry Pi with motion sensor
            So I will not publish any code… :-)

            //Serimner

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