Both the motor and the encoder are connected to an Arduino Pro Mini which receives step and direction commands from the printer controller.

To program these chips, [Aaron] first had to wire up the microcontroller into a circuit. This was just a bit of perf board, a resistor, a few caps, and a USB A plug.

An Arduino is a popular open-source single-board microcontroller. Learn how to program one and let the possibilities take shape.

You could simply program your machine to give a visual indication of whether it's a lie or the truth by programming your Arduino to detect large shifts in your electrodermal activity.

In this project, we create a joystick-controlled laser by connecting two servos to a joystick and using this setup as a pan-and-tilt controller for a laser pointer.