LED Backlight for mirror - PIR to control them

[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.

[Mirrorolentia]

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.

[orayoflighto]

I did this.

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.

[cowboysdude]

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

[orayoflighto]

@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

[cowboysdude]

@orayoflighto VERY nice, Thank you!!!

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

[Snille]

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. :)

[Kimzer]

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

[Kimzer]

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

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

To quote myself…

Can i use any sorts of led strips? Im looking to buy something from a store and not order online if possible.
Im in norway so if anyone knows something i could buy please let me know!

[orayoflighto]

Different strips have different ways they need to be programmed. Some have faster refresh rates than others.

Most people will suggest ADA102 for beginners. The strips I linked to are LPD8806. As I mentioned previously the only reason I bought those ones is that MMM-PiLights was programmed to use them.