Solar tracking systems are used to maximize the power output of solar panels by tracking the sun's movement across the sky. This can be done using a variety of mechanisms, including single-axis and dual-axis trackers. In this book, a solar tracking system using Arduino is described. The system uses a light-dependent resistor (LDR) to sense the direction of the sun and a servo motor to adjust the position of the solar panel accordingly. The Arduino microcontroller is used to control the servo motor based on signals received from the LDR.