It probably won’t surprise you to find out that a 1989 BMW 325i doesn’t have much in the way of electronic gadgetry onboard. In fact, what passes for an in-dash “computer” in this vintage Beemer is just a digital clock with a rudimentary calendar function. Not content to waste his precious dashboard space any longer, [Ryan Henderson] used his time in quarantine to replace the clock module with a Raspberry Pi.
Nestled in a custom laser-cut housing is a touch screen LCD module that connects directly to the GPIO header of a Pi Zero. Combined with some Python code, this provides a very slick multipurpose interface for pretty much anything [Ryan] wants. Right now he’s got it hooked up to a GPS receiver so he can figure out things like speed and acceleration, but the only real limit on what this little drop-in upgrade can do is how much code you want to sit down and write.
Thankfully, it sounds like [Ryan] has done a lot of the hard work for you. He’s put together a Python library that allows the user to easily draw analog gauges on the screen. The faces are parametrically sized, and even have custom minimum/maximum marks. Of course if you’d rather just throw some text and images on the screen, that’s accomplished easily enough with existing libraries such as PyGame.
[Ryan] says he’s also working on some code to better integrate the Pi into the vehicle’s systems by way of a Bluetooth OBD2 adapter. In the most basic application that would allow you to throw various bits of engine data up on the screen, but on more modern cars, you could potentially tap into the CAN bus and bend it to your will.
While the physical size and shape of this particular modification is clearly focused on this model and year of BMW, the general concepts could be applied to any car on the road. [Ryan] has recently started a GitHub repository for the project and hopes to connect with others who are interested in adding a little modern
complexity convenience to their classic rides.
The reality is that cars become more dependent on their onboard computers with each passing year. Already we’re seeing Tesla owners struggle with cooked flash chips, and things are likely to get worse before they get any better. While undoubtedly there are some that would rather keep their daily driver as simplistic as possible, we’re encouraged by projects like this that at least let owners computerize their cars on their own terms.