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    PIR-sensor and 7 inch touch LCD display for Raspberry-Pi

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    • SerimnerS Offline
      Serimner
      last edited by

      Hello,
      Maybe this question has been put to the wrong forum, but I chance.

      I’m trying to use the Raspberry-Pi 7 "touch LCD with a PIR sensor.
      My goal is to have a photo frame with MM information. When no activity is detected, I want the screen to turn black (powersave) but when the PIR sensor detects activity, the screen should light up.
      I have tried all the modules that have to do with PIR sensors, but none of these work for me. At the start of MM I get a black screen with a mouse pointer, nothing more …

      My question is - is there anyone in this forum that has built something similar?
      If so, do you have any tips ?!

      //B

      S 1 Reply Last reply Reply Quote 0
      • S Offline
        sdetweil @Serimner
        last edited by

        @Serimner tell us more, when did you install, how did you install, what modules did u add.
        open the developers window, ctrl-shift-i,. select the tab labeled ‘console’ and scroll up to see any errors,
        usually red text…

        Sam

        How to add modules

        learning how to use browser developers window for css changes

        SerimnerS 1 Reply Last reply Reply Quote 0
        • SerimnerS Offline
          Serimner @sdetweil
          last edited by

          @sdetweil
          Hi Sam,
          I have installed this on my PI:
          Raspbian Buster 4.19
          MagicMirror v2.8.0
          Node v10.16.3
          pm2 v3.5.1
          I have installed this using the installationguide the provide (I’m real noob at this).

          The module I have tested most is MMM-PIR-Sensor (https://github.com/paviro/MMM-PIR-Sensor)
          My configuration:

          module: "MMM-PIR-Sensor",
          position: "fullscreen_below",
          config: {
          	sensorPin: 22,
          	powerSaving: true,
          	powerSavingDelay: 1,
          }
          

          But I can see in the code that MMM-PIR-Sensor uses vcgencmd!
          When i test “vcgencmd display_power = 0/1” from terminal it do not work om my hardware.

          If I try “echo 0/1 > /sys/class/backlight/rpi_backlight/bl_power” it works fine but…
          Every time MM updates its view, MM resets bl_power and light up the screen.
          (BTW, I have testet my PIR-sensor in Python and it works as expected…)

          //S

          S 1 Reply Last reply Reply Quote 0
          • S Offline
            sdetweil @Serimner
            last edited by

            @Serimner so, rather than call the vcgencmd, call your python script, do what it does

            Sam

            How to add modules

            learning how to use browser developers window for css changes

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            • SerimnerS Offline
              Serimner
              last edited by

              @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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              • qu1queQ Offline
                qu1que Project Sponsor
                last edited by

                @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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                • SerimnerS Offline
                  Serimner
                  last edited by

                  @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…

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

                    @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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                    • SerimnerS Offline
                      Serimner
                      last edited by

                      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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