Config file section

Valid in machine config files YES
Valid in mode config files NO

The rgb_dmds: section of your machine config is where you configure the settings for physical RGB DMDs (dot matrix displays). You only need this section if you have a RGB DMD connected via USB. If you have a mono DMD, configure that in the dmds: section.

If you want to show a virtual RGB DMD in an on-screen window, you configure that as a display widget with a dot filter. You don’t need to use this rgb_dmds: section to do that.

Note there are no height and width settings here. The pixel size of your DMD is determined by the size of the source: display which drives the content for this DMD.

Here’s an example:

    width: 128
    height: 32

  smartmatrix:  # name of this DMD which can be whatever you want
    brightness: .5
    fps: 25
    gamma: 2.5

Note that this section is called rgb_dmds: (plural). Just like “switches” and “coils” and most everything else in MPF, this is a section that contains all your DMDs. Now since this is a DMD, you probably only have one, (though MPF can support as many as you want), but it’s important to note that you add a rgb_dmds: section to your config, then under that you add an entry for a specific DMD (which can be whatever you want), and then you enter one or more of the following settings:

(If you don’t include any of the settings below, the default will be used).


Single numeric value, Default: 0.5

A brightness multiplier for the DMD. Default is 0.5 which is 50% brightness, (because LED RGB DMDs are crazy bright!), but you can adjust this higher or lower as needed.

Note that brightness is closely related to gamma (see below). You’ll probably want to adjust both of them together.


Single numeric value, Default: 2.2

Sets the gamma of the DMD. See Gamma correction in MPF for details.

Note that the default setting of 2.2 will probably be ok, though if your RGB DMD does its own internal gamma correction, you’ll want to set the gamma to 1.0 (which is effectively disabling it).

Note that gamma is closely related to brightness (below). You’ll probably want to adjust both of them together.


Gamma setting is important!

We can’t stress enough that setting the gamma for your DMD is important for making it look right. So click the link above and make the adjustment. It’s a one-time thing.


Single value, type: integer. Default: 30

How many frames per second this DMD will be updated. Note that some RGB DMDs cannot handle the full 30fps, so you might have to dial this back to around 25 or so or else the DMD won’t be able to keep up and will get behind.


Single value, type: boolean (Yes/No or True/False). Default: False

Specifies whether every frame is sent to the DMD, or only changed frames.


Single value, type: string. Default: dmd

The name of the display (from the displays: section of your machine config) that is the source for this physical DMD. Whatever’s on the source display will be displayed on the DMD. If you don’t specify a source, MPF will automatically use a source display called “dmd”.


Single value, type: string. Default: None

Name of the platform this DMD is connected to. The default value of None means the default hardware platform will be used. You only need to change this if you have multiple different hardware platforms in use and this coil is not connected to the default platform.

See the Mixing-and-Matching hardware platforms guide for details.