[Note for the impatient: there is a picture if you scroll down.]

Whither Pi?

Image copyright (c) Raspberry Pi Foundation

I’ve been aware of the Raspberry Pi for a while. (Despite the long stretches of inactivity on my blog, I don’t live under a rock.) However, until very recently I haven’t felt any particular need to have one.

That all changed in December. As with many families with younger kids, for us playing movies in the car is an essential component of longer car trips. Unfortunately, car DVD players are pretty horrible: unreliable, user-hostile, and just generally permeated with evil and crappiness. For a while I’ve been wanting a device that could play digital videos (i.e., DVD rips) in the car. Our kids are a bit young for tablets, and I’m not sold on the tablet concept in general. Another issue is display hardware: most inexpensive car LCDs take composite video input, but it’s not easy to find a device that does composite video output.

My realization in December was that the Raspberry Pi outputs composite video! Suddenly, I had to have one! The break between the Fall and Spring semesters is an excellent time to work on “fun” projects, so I started ordering hardware. My vision was a handheld device (containing the Raspberry Pi) that the parents in the front seat of the car would control, and which would drive the LCDs in the back seat via composite video. Audio output would feed into the aux input on the car stereo. All of the hassles of car DVD players would be eliminated: no interminable delay waiting for the disc menu, no skipping, no turning around to change discs, etc.

Building stuff

In pursuit of my vision, here is what I did over my break:

You can read about all of the gory details in the build log if you’re interested.

All of the stuff I did is in a git repository (and, of course, is open source):


The weird thing I made

Anyway, here’s what I have so far:

Pretty cool, eh? Just to confirm what you’re probably thinking: it is really fun to press those keys.

What’s next

There are still two things I need to do in order to complete the project:

  1. Finish the software: right now, it plays music, but playing video doesn’t work yet. I don’t anticipate that video will be too hard to get working, because omxplayer works fine from the command line, and my menu system just needs to run it as a subprocess.
  2. Get all of the hardware installed in the car. I believe I have all of the parts I need. One annoying detail is that our 2007 base model Honda Fit didn’t come with an aux input for the car stereo, so we will need to have one installed.

I will update the blog when I have more progress to report.

blog comments powered by Disqus