Using a traditional (single color) physical DMD¶
This guide will show you how to use a traditional, physical DMD with MPF, like this:
This is supported with the following control systems:
It will also show you how to create an on-screen popup window which will show the contents of the DMD, like this (with a blank DMD):
If you want to use a physical DMD without the on-screen equivalent, we’ll show you how to do that at the end.
If you want to only have an on-screen DMD without the physical one, like if you want to replace the DMD with an LCD screen but still have it look like a DMD, then read this guide instead.
The final version of the relevant sections of your machine config for a physical DMD with an on screen window too will look like this:
1. Understand how physical, mono DMDs work¶
This guide explains how to config physical single-color (mono) DMDs. These are DMDs that are connected to your FAST Pinball or P-ROC controller via the 14-pin ribbon cable, like this:
It makes no difference whether you’re using an LED or an original plasma gas DMD. (Also it doesn’t matter what color it is.)
2. Add your displays to your MPF config¶
The first part of the config file above is where you create your logical displays like we covered in the Working with Displays section.
displays: window: width: 600 height: 200 dmd: width: 128 height: 32 default: true
We’re creating two displays here. The first is called “window” and has a size of 600x200. This will be the display that shows up on the computer screen.
The second display, which we’re calling “dmd”, will be the display that provides the content for the physical DMD. This display is 128x32, which is the pixel size of the DMD.
Notice that we set
default: true for the dmd display. This is because as
we’re creating display content in our game, we want it (by default) to show up
in the DMD (since that will be the primary display in our game).
Note that you don’t set colors or anything here—this is just setting up the logical displays which we’ll use next.
3. Add your window configuration¶
Next, we have a
window: section which holds the settings for the actual
on screen window itself. In this case we’re just configuring it to be 800x600,
with a window title of “Mission Pinball Framework”.
window: width: 600 height: 200 title: Mission Pinball Framework
Notice that in this case, we did not add the
setting to this section. That’s because we have a logical display called
“window”, and when you have that, the on-screen window will automatically use
that display as its source.
4. Configure a window slide to show the on screen DMD¶
Now we have a working on-screen window and a working physical RGB DMD. But if
mpf both now, your on screen window will be blank because we haven’t
built any slides to show up.
So in this step, we’re going to build a slide for the on-screen window that will be shown when MPF starts. We’ll add some widgets to that slide to make it look like the screen shot at the beginning of this guide.
First, create a
slides: section in your machine config (if you don’t have
one already), and then create an entry for the slide that we want to show. In
this case, we’ve decided to name that slide “window_slide_1”. (Of course you can
call this slide whatever you want.)
Next we have to add some widgets to that slide. (Refer to the documentation on widgets if you’re not familiar with widgets yet.)
slides: window_slide_1: - type: display effects: - type: dmd pixel_color: ff5500 width: 512 height: 128
Again, there are lots of options here. Note that we’re adding a
width: of 512x128. This is the on-screen pixel size of the DMD as it will
be drawn in the window. In this case we chose an even multiple of the source
display for the DMD (which is 128x32), meaning that each pixel of the original
DMD will be rendered on screen as 4 pixels by 4 pixels. This is big enough
to get the circular “dot look” filter to look good, and being an even multiple
means that we won’t have any weird moire patterns.
For the on screen DMD, we are able to select the pixel color, because this
is how the DMD will be drawn on the computer screen, and MPF has no idea what
color the actual DMD is. So you can pick any color you want here. We chose
ff5500 which is a classic DMD orange color.
There are other options listed in the dmd effect documentation to control settings like how big the circles are versus the space in between them, the ability to not have the “dot” filter, and the ability to set the “glow” radius of each dot, color tint, limiting the color palette, etc.
Note that in this case, we did not have to add the
because we have a display called “dmd” which will automatically be used as the
source for the color DMD widget.
Next, we also added two more widgets to this slide—a text widget with the title of the machine, and a gray rectangle that’s slightly larger than the DMD to give it a nice border.
slides: window_slide_1: - type: display effects: - type: dmd pixel_color: ff5500 width: 512 height: 128 - type: text text: MISSION PINBALL FRAMEWORK anchor_y: top y: top-3 font_size: 30 - type: rectangle width: 514 height: 130
5. Configure the slide to show when MPF starts¶
Now we have a nice slide with the virtual DMD on it, but if you run MPF, you still won’t see it because we didn’t tell MPF to show that slide in the window. So that’s what we’re doing here:
slide_player: init_done: window_slide_1: target: window
If you don’t have a slide_player: entry in your machine-wide config, go ahead and add it now. Then create an entry for the init_done event. This is the event that the media controller posts when it’s ready to be used, so it’s a good event for our use case.
Then under that event, create an entry to show the slide you just created in the
previous step. Notice that we also have to add the
target: window entry to
tell the slide player that we want this slide to show on the “window” target.
We need to do this because the default display (from Step 2) is the DMD, so if
we don’t specify a target, this slide will show on the default, which would be
the DMD, instead of being shown on the window. (In this case, we would show a
slide on the DMD which contains a DMD widget whose source is the DMD, and we’d
probably open up some kind of wormhole and destroy the universe. So don’t do
And this point, you’re all set! Of course there’s no content on the DMD yet because we haven’t set up any slide_player entries to add content to it, but that’s something you can do by following the tutorial or looking at the guides for the slides and widgets here.
6. What if you don’t want the on-screen window?¶
There might be some scenarios where you just want the physical DMD with no on-screen DMD. (For example, maybe you’re using a low-power single board computer and you don’t have enough horsepower to run a graphical environment.)
This is fine. To do it, just remove the window-related components from the config.
In this case, you wouldn’t need the
default: true entry for the dmd in the
displays: section because you only have one display, so it will automatically
be the default.
7. Configure the physical DMD¶
At this point you have two displays configured, and you have default content showing up in both of them. The final step is to add the configuration for your physical DMD so that MPF can talk to your hardware.
The exact steps to do that vary depending on which DMD hardware platform you’ve chosen, so click on the one you have from the list below and follow the final instructions there to get everything set up.