The capacitive touch controller is a physical computing device capable of controlling a servo motor's angular rotation. The capacitive interface provides an ON and OFF control signal to the Arduino. The capacitive touch sensing circuit works with human body capacitance which creates an electrical plate that can store or release static energy. The change in static energy within the electrical plate is used to trigger the 555 timer detection circuit. Upon receiving the static energy, the 555 timer IC generates a small electrical pulse that the Arduino reads and then outputs an angle control signal to the servo motor at digital pin 9.

The servo motor's direction changes when touching the capacitive touch sensor electrode (wire). To make the capacitive touch sensor easy to use, the electrode is attached to a metal plate for touch control. A concept drawing of the capacitive touch controller with the sensor is as follows:

The capacitive touch controller...