This is a serial interface for any LCD using the incredibly common 44780 controller. There are a couple different serial interfaces like this on the market, but this project aims to be a superior version. It can use 5 – 30V with an included regulator. It has ESD protection. True RS232 levels mean you can use really long cables. Up to 8 buttons are also supported. This would work great with a car computer. All of the software and schematics are provided. Have a look around the madhacker site for a lot of other cool projects.