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    A New Chapter for MagicMirror: The Community Takes the Lead
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    LED Backlight for mirror - PIR to control them

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    • KimzerK Offline
      Kimzer
      last edited by

      Hey,

      I am planning on buying some led strips to have as backlight on my mirror.
      I do not want them to be on all the time, i was hoping there was a way for me to power them from the raspberry pi and have the pir sensor wich now controlls wether the screen is on or off to also turn on/off the LED’s at the same time.

      Is it doable? Would there be enough power in the PI to make it all work reliably?

      If so, can i use any kind of led strip? Is there a module existing for this already?

      1 Reply Last reply Reply Quote 0
      • M Offline
        Mirrorolentia
        last edited by

        Hello there,
        I too want to try out this project. I have a WS2812B (60 leds/meter) that I have used for creating a Hyperion configuration. I am planning to use the same. You will probably have to use an external power supply. Seems like a 5 meter strip of 60leds/meter will need ~10-15 Amp current at 5 Volts which obviously Pi cannot sustain. Also I found using an Arduino provides more control than the Pi but that is me. Will try to get something started in a week’s time and update on the progress.
        Please do let me know if you too have started on something.

        1 Reply Last reply Reply Quote 0
        • pjkoelemanP Offline
          pjkoeleman
          last edited by pjkoeleman

          @Mirrorolentia said in LED Backlight for mirror - PIR to control them:

          Please do let me know if you too have started on something.

          I’am working on a Pi-hat (plug on to the GPIO connector) witch can control an RGB-LED strip.
          For the software I want to use a PIR and the clock for switching On/Off. With PWM (Puls Wide Modulation) regulating the brightness. Color changing will be random, but there will be a fixed color in a white color, around 3000 K (warm-white).

          It will take some time to build/write the software, because I’am not a software guru.

          1 Reply Last reply Reply Quote 0
          • M Offline
            Mirrorolentia
            last edited by

            So finally have been able to integrate the led lights :) Got the code working just now. However, will need sometime to make a proper module out of it. Tried out with johnnyfive and node-pixel with some luck…but it was hyperion/boblight that did the magic for me.
            Of course, the trigger comes from Alexa/Echo rather than a PIR sensor.

            1 Reply Last reply Reply Quote 0
            • O Offline
              orayoflighto Project Sponsor
              last edited by

              I did this.

              alt text

              I used the MMM-PIR-Sensor module and changed the following in node_helper.js:

              From:

                      if (data.indexOf("0x120002") !== -1)
                        exec("/opt/vc/bin/tvservice --preferred && chvt 6 && chvt 7", null);
              

              To:

                      if (data.indexOf("0x120002") !== -1){
                        exec("/opt/vc/bin/tvservice --preferred && chvt 6 && chvt 7", null);
                        exec("python /home/pi/py-spidev/RPi-LPD8806/LED.py");
                     }
              

              and

              From:

                    exec("/opt/vc/bin/tvservice -o", null);
              

              To:

                    exec("/opt/vc/bin/tvservice -o", null);
                    exec("python /home/pi/py-spidev/RPi-LPD8806/off.py");
                     }
              

              Note that in the first from - to there is a “)” missing in the original code that you will need to fix. Also note that as soon as the module gets updated if you hack the code like I did above it will be wiped out when you update.

              cowboysdudeC 1 Reply Last reply Reply Quote 3
              • cowboysdudeC Offline
                cowboysdude Module Developer @orayoflighto
                last edited by cowboysdude

                @orayoflighto NICE!!! What light strips did you use?

                O 1 Reply Last reply Reply Quote 0
                • O Offline
                  orayoflighto Project Sponsor @cowboysdude
                  last edited by

                  @cowboysdude

                  I used these only because they were incredibly cheap and I originally started out looking at MMM-PiLights which uses the same LPD8806 type:

                  https://www.amazon.com/gp/product/B01COEJST8/ref=oh_aui_detailpage_o09_s00?ie=UTF8&psc=1

                  I used this python code:
                  https://github.com/longjos/RPi-LPD8806

                  cowboysdudeC 1 Reply Last reply Reply Quote 2
                  • cowboysdudeC Offline
                    cowboysdude Module Developer @orayoflighto
                    last edited by cowboysdude

                    @orayoflighto VERY nice, Thank you!!!

                    You outta do a write up with instructions! MANY people would love this!

                    1 Reply Last reply Reply Quote 0
                    • SnilleS Offline
                      Snille Module Developer
                      last edited by

                      Just to add some depth to this… If you really want to go “crazy” with animations, I’m recommending Bibliopixel and PixelWeb. Then you can “animate” lot’s and trigger them with a curl “command”. Plus you get a nice Web-interface to test the animations in. :)

                      If you cant find it, make it and share it!
                      Modules: MMM-homeassistant-sensors, MMM-Modulebar, MMM-Profilepicture, MMM-Videoplayer

                      1 Reply Last reply Reply Quote 1
                      • KimzerK Offline
                        Kimzer
                        last edited by

                        Oh lawd! This looks insanely good. Thanks alot for the guide. Out to go buy some strips today! :D

                        KimzerK 1 Reply Last reply Reply Quote 0
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