This article explains proportional integral derivative (PID) control, including the math behind it, with the use case of a linear servo motor.

If you bought a new Subaru, you will want to protect it in your garage. The most convenient way is to program its garage door opener. Here's how to do it.

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.