This ebook provides a comprehensive guide to potentiometers, one of the most fundamental components in electronics. The book explains the working principles of potentiometers, including their role in voltage division, signal adjustment, and user input. Readers will learn to integrate potentiometers with Arduino and ESP32 for applications like dimming LEDs, controlling motors, and adjusting display brightness. With hands-on examples, wiring diagrams, and source code, this guide equips readers with the skills to enhance their electronic projects through precise voltage control.