Adding RGB LEDs to your Lagom or Större board

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Lagom and Större both support an underglow RGB LED light strip. This is not included in the kit, but you are able to add a WS2812b (or similar) compatible LED strip to the underside (or case) of the boards using the exposed pins on the underside of the PCB.

Where do I add the LED strip?

You add the LED strip using the 3 holes exposed on the underside of the Lagom PCB. To make attaching a strip of LEDs easier it may be easier to add a small socket to these holes as shown in the image below.

How is the LED strip connected to the controller?

  • The GND is connected to the common ground of the board and controller
  • The VCC is connected to the 5V output of the controller
  • The LED pin is connected to pin F6 of the controller

How do I configure the LED strip in firmware?

As LED strips vary in length it’s best if you configure this yourself and then compile your own firmware files. In the example below I have a strip of 11 LEDs.

There’s a couple changes that you need to make to info.json to make it happen before recompiling the firmware (and you can see the firmware files here). These changes are:

  • Adding "rgblight": true to the feature section
  • Adding a rgblight and ws2812 section. More info here too.
"rgblight": {
        "led_count": 11,
        "sleep": true,
        "hue_steps": 10,
        "saturation_steps": 10,
        "brightness_steps": 10,
        "animations": {
            "rainbow_mood": true,
            "static_gradient": true
        }
       },
    "ws2812": {
        "pin": "F6"
        }
  • You’ll then need to assign some keys to toggle on the RGB and change modes etc. This is easiest done in Vial if you’ve flashed a Vial compatible image. You can do this through the Vial interface on the ‘Backlight’ tab.
  • Bear in mind that the RGB feature takes up some space so you may run out of space if you’re compiling this for a Pro Micro
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