An Arduino is a microcontroller — a single board designed to control something ... and a list of other connectors to link the ...

A Pro Mini model was chosen for its small size ... 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 this three part video series we watch [Dirk Herrendoerfer] go from scraps to a nice 3D printed assembly as he iterates through the design of a pen plotter for making circuit boards.