Jumper wires soldered to the circuit board simply allow the Arduino to emulate button pushes. To ensure that the head unit buttons still work in conjunction with the steering wheel buttons ...

Thanks to [Kevin Thomas], if you have an Arduino and a 3D printer, you can build a rubber band sentry gun to protect your geeky comestibles. You’ll also need some metric hardware, an Arduino ...

The controller uses a conductive rubber cord (available on Adafruit) which changes resistance when stretched. It is very easy to measure that using an Arduino, from where it can be forwarded to a PC.