<p>➀ This article introduces an Arduino-based automatic bell system that can ring at predefined times without manual intervention.</p><p>➁ The system uses an RTC module for precise timekeeping and an LCD display to show the current time and upcoming bell schedules.</p><p>➂ It allows users to adjust bell timings using a 4x4 matrix keypad, making it suitable for various school schedules and exam periods.</p>